Zoning › Ohio › Montgomery County › Dayton

Dayton, OH Zoning

Euclidean-zoning. 23 districts · 6 overlays · 4 applicable state preemptions.

Overview

Code type
euclidean
Naming convention
letter-code
Naming convention by category
single_family_residentialS/E/M prefix (Suburban / Eclectic / Mature urban-fabric context) + R-N intensity index. SR-1 / SR-2 = Suburban Single-Family; ER-3 / ER-4 = Eclectic Single-Family; MR-5 = Mature Single-Family. Numbers index decreasing min lot area (SR-1 = 7,000 sf largest → MR-5 = 3,000 sf smallest). This is NOT lot-size-encoded (SR-1 is not 1,000 sf) — number is sequential urban-context intensity.
multi_family_residentialS/E/M prefix + MF: SMF Suburban MF, EMF Eclectic MF, MMF Mature MF. No du/ac cap stated in code (§150.310.3(E) explicitly says 'no maximum density is proscribed' — density governed by lot-coverage, setbacks, height, and Residential Contextual Standards instead).
manufactured_homeMH — Manufactured Home District (community-scale, 8-acre minimum tract).
downtown_businessUBD / CBD — Urban Business and Central Business Districts. 100% lot coverage, 0 ft min lot width, 0–10 ft front setback, 0 ft side/rear setbacks. CBD has NO max height; UBD capped at 65 ft.
commercialS/E/M prefix + N/G + C: MNC/ENC/SNC Neighborhood Commercial; MGC/EGC/SGC General Commercial. Front setbacks differ by urban-fabric context (Mature most permissive at 0–10 ft; Suburban most restrictive with 10 ft min + 30 ft landscape buffer if >50 ft from ROW).
mixed_use_transitionalT (Transitional) and MX (Mixed-Use Hub). MX adds height tier bonuses adjacent to denser residential contexts.
campus_institutionalCI — Campus-Institutional. Hospital / university scale; 65 ft max within 150 ft of CI boundary, no max height >150 ft from boundary.
industrialI-1 Light Industrial, I-2 General Industrial, BP Business Park. I-2 has no max height by default; I-1 / BP capped at 65 ft.
airportAP — Airport District. Applies to Dayton International Airport (DAY) property; all standards deferred to FAA-approved Airport Master Plan (NOT a Wright-Patterson AFB AICUZ overlay).
overlaysHD-1 / HD-2 / HD-3 (Historic Overlay), PD (Planned Development Overlay), UP (Urban Preservation Overlay), WO (Well Head Operation) + WP (Water Protection Overlay) Source Water Protection Districts, OS (Park/Open Space).

Dayton's 19 base + 3 overlay districts use a three-tier urban-context prefix (Suburban / Eclectic / Mature) that maps roughly to outer-ring / streetcar-era / pre-streetcar urban-fabric vintages. Within each prefix, a numbered or named suffix indexes intensity. SF residential has 5 districts (SR-1 → MR-5) with stepped min-lot from 7,000 sf down to 3,000 sf. The downtown CBD has NO maximum height — a true high-rise-permissive provision unusual for mid-size cities. Despite the urban-context naming, the bulk of the code uses Euclidean tables — there is no transect (T3–T6) or build-to-line form-based provision. CBD's 0 setback + 100% coverage + no max height is the closest the code comes to form-based but is best classified as 'downtown-form-permissive' under euclidean. PD is a true overlay (not a district replacing base zoning) — §150.350.13 says regulations of the underlying base district continue to apply except as modified by the Planned Development. | sub_flags_raw=[charter-city, downtown-form-permissive]

Worth knowing
  • CBD (Central Business District) has NO maximum building height per Schedule 150.320.4 — explicitly 'None' on the row (2) Maximum Building Height for CBD. This is a true high-rise-permissive provision; combined with 100% lot coverage + 0 ft setbacks (front max 10 ft, side/rear 0 ft), it creates an extremely permissive downtown core for tall mixed-use towers — a development envelope more typically seen in major-metro CBDs than mid-size Ohio cities. Modeling tall-building feasibility in CBD is bounded only by FAA Part 77 surfaces (Dayton International to the north, Wright-Patterson to the east), structural / market constraints, and §150.320.5 parking (which is also waived for non-MF uses). — [c§Schedule 150.320.4 (CBD row); c§Schedule 150.320.3; c§§150.320.5(A)]
  • I-2 (General Industrial) ALSO has NO maximum building height per Schedule 150.340.4 — 'None' on the baseline row. Drops to 50 ft only when adjacent to a residential district. This is a high-severity quirk for industrial-massing modeling: tall industrial / data-center / logistics buildings have no code-level height ceiling in I-2 as long as they are not directly adjacent to residential. CI district also has no max height when >150 ft from CI boundary per Schedule 150.335.4. — [c§Schedule 150.340.4 (I-2 row); c§Schedule 150.335.4 (CI)]
  • Multi-Family Residential Districts (SMF/EMF/MMF) have NO maximum density per §150.310.3(E) — explicit statement 'In Multi-family Residential Districts, no maximum density is proscribed.' Density is governed by lot coverage (40/50/65%), setbacks, and height + Residential Contextual Standards (§150.310.10). Modeling MF feasibility cannot use a du/ac ceiling — must work from coverage × height × min unit size derived from §1204.10 etc. Building-form changes the lot-area math materially: SMF single/two-family use = 5,000 sf min lot; SMF multi-family use = 2 acres (87,120 sf) min lot — a 17.4x jump. — [c§§150.310.3(B/D)/(E); c§§150.310.5]

+ 11 more in Quirks & notes

Districts

com 10res_sf 5res_mf 4ind 3spec 1
CodeNameCategory Min lotHeight CoverageFAR Du/acParking Setbacks F/S/R
SR-1Suburban Single-Family Districtres_sf7,000 sf[4]40 ft[5]——4.52[6]25[1] / 5[2] / 30[3]
SR-2Suburban Single-Family Districtres_sf5,500 sf[10]40 ft[11]——5.52[12]25[7] / 5[8] / 30[9]
ER-3Eclectic Single-Family Districtres_sf4,500 sf[15]40 ft[16]———2[17]— / 4[13] / 30[14]
ER-4Eclectic Single-Family Districtres_sf3,500 sf[20]40 ft[21]———2[22]— / 3[18] / 30[19]
MR-5Mature Single-Family Districtres_sf3,000 sf[25]40 ft[26]———2[27]— / 3[23] / 30[24]
SMFSuburban Multi-Family Districtres_mf—40 ft[30]————25[28] / — / 25[29]
EMFEclectic Multi-Family Districtres_mf—50 ft[32]————— / — / 25[31]
MMFMature Multi-Family Districtres_mf—60 ft[34]————— / — / 25[33]
MHManufactured Home Districtres_mf3,600 sf[38]———8[39]2[40]50[35] / 25[36] / 15[37]
UBDUrban Business Districtcom—65 ft[44]———0.5[45]10[41] / 0[42] / 0[43]
CBDCentral Business Districtcom—————0[49]10[46] / 0[47] / 0[48]
MNCMature Neighborhood Commercialcom—40 ft[53]————0[50] / 0[51] / 0[52]
ENCEclectic Neighborhood Commercialcom—40 ft[57]————0[54] / 0[55] / 0[56]
SNCSuburban Neighborhood Commercialcom5,000 sf[61]40 ft[62]————10[58] / 0[59] / 0[60]
MGCMature General Commercialcom—40 ft[66]————0[63] / 0[64] / 0[65]
EGCEclectic General Commercialcom—40 ft[70]————0[67] / 0[68] / 0[69]
SGCSuburban General Commercialcom5,000 sf[74]50 ft[75]————10[71] / 0[72] / 0[73]
TTransitional Districtcom5,000 sf[79]40 ft[80]————10[76] / 0[77] / 0[78]
MXMixed-Use Hub Districtcom—65 ft[84]————0[81] / 0[82] / 0[83]
CICampus-Institutional Districtspec—65 ft[87]————— / 10[85] / 10[86]
I-1Light Industrial Districtind—65 ft[91]————0[88] / 0[89] / 0[90]
I-2General Industrial Districtind——————10[92] / 0[93] / 0[94]
BPBusiness Park Districtind43,560 sf[98]65 ft[99]————25[95] / 30[96] / 30[97]

Confidence: confirmed partial under review not found

Overlays

HD
Historic Overlay Districts (HD-1 / HD-2 / HD-3)
HP
Zoning Code §150.345 Historic Overlay Districts (purposes, designation, boundaries, activities governed, architectural design standards, classes of architectural modifications, classes of properties, removal/demolition, mitigation, area-and-bulk regulations, certificate of appropriateness, review/appeal procedures, penalties)

Locally-designated historic districts (HD-1, HD-2, HD-3) and individual landmark properties; nominated under §150.345.3 and adopted by City Commission. Boundaries shown on Official Zoning Map. Categories per §150.345.8: Listed, Contributing, Non-contributing, Significant.

PD
Planned Development Overlay District
SPEC
Zoning Code §150.350 Planned Developments (purposes, application/procedures, form of application, requirements, final-plan application, phasing, review criteria, final-plan review, restrictions, modifications, permitted/conditional uses, regulations from underlying district, density, accessibility, joint/cross access, site layout, site design)

Mapped on Official Zoning Map after PD application approval per §150.350. May be initiated by property owner application; subject to Plan Board recommendation and City Commission approval. No stated minimum site area threshold (unlike Middletown's 5-acre floor).

UP
Urban Preservation Overlay District
HP
Zoning Code §150.355 Urban Preservation Overlay District (purpose, definition, Preservation Review Committee establishment, district designation, Urban Preservation Plan, use/area/bulk regulations, neighborhood compatibility standards, amendments, enforcement, modification approval procedures)

Area of the City possessing notable cultural, architectural, or historic character (per §150.355.2 definition) and recommended for UP overlay by Plan Board / approved by City Commission. Each UP district has its own adopted Urban Preservation Plan (§150.355.5).

WO
Source Water Protection — Well Head Operation District
ENV
Zoning Code §150.363 Source Water Protection Districts (purposes, R.C.G.O. Chapter 53 cross-reference, permitted/prohibited uses, lot/setback, height, groundwater protection standards, outdoor activities, TMDI variances)

Mapped on property owned by the City of Dayton at the location of any city-owned and operated (or designated future) public water supply well, recharge lagoon, or other related water facility (§150.363.1(A)). Designed to protect the regional potable water supply from contamination.

WP
Source Water Protection — Water Protection Overlay District
ENV
Zoning Code §150.363 (same section as WO)

Mapped on land within the Source Water Protection Area, adjacent to existing and proposed municipal water well fields within the City, not included in the WO District (§150.363.1(B)). True overlay layered over underlying base zoning (residential, commercial, industrial, etc.).

AP
Airport District (Dayton International)
AP
Zoning Code §150.343 Airport District (purposes, permitted uses, lot/setback/height, parking, outdoor storage, accessory uses, development plan review)

Property owned by the City of Dayton for and used for Dayton International Airport operations (NOT a Wright-Patterson AFB AICUZ overlay — WPAFB AICUZ is captured in federal_overlay_refs).

State preemptions

OH-Art-XVIII-Home-Ruleapplies
Qualifying condition
Dayton is a municipal corporation (incorporated city, pop 136,346 per Census 2024 estimate, charter city in continuous commission-manager governance since 1913). Ohio Const. Art. XVIII §3 grants all municipalities home-rule authority over local self-government including zoning. As a charter city explicitly listed in zoning/us/ohio/preemptions.md and zoning/us/ohio/overlays.json among the 10 prominent Ohio charter cities, Dayton derives this authority directly from the Constitution and its own Charter; ORC Chapter 713 attaches only where it codifies a 'general law' under the Canton v. State (2002) four-part test.
Effect
Meta-preemption framing. Dayton's Zoning Code (R.C.G.O. Chapter 150) is a power of local self-government. For a state statute to preempt the Zoning Code, it must be a 'general law' AND address a matter not purely local, OR expressly override in a state-interest field. Preemption burden sits on the state.
OH-713.15applies
Qualifying condition
ORC §713.15 (statewide nonconforming-use floor: discontinuance period 6–24 months floor with default 24 months) is treated by the Ohio preemptions.md framing as a substantive general-law floor that reaches charter cities. Dayton's Zoning Code §150.140 (Non-Conforming Uses, Buildings, Structures, and Lots) preserves grandfather rights of pre-existing lawful uses (specific discontinuance period not extracted this pass — expected compliance with the §713.15 6-month minimum floor).
Effect
Local nonconforming-use amortization provisions must respect §713.15 substantive floors. Specific local discontinuance period at §150.140 not extracted this pass — captured as expected compliance based on the statutory floor; direct §150.140 dimensional extraction is a quality gap.
OH-5104.054applies
Qualifying condition
Dayton is a municipal corporation; ORC §5104.054 (HB 33, effective Jan 1 2025) applies uniformly to cities, villages, townships, and counties regardless of charter status. Type B family child care homes (1–6 children in caregiver's personal residence) must be permitted as-of-right in all districts where residential uses are permitted; no CUP or special exception may be required.
Effect
Dayton Zoning Code permitted-use schedules in SR-1, SR-2, ER-3, ER-4, MR-5, SMF, EMF, MMF, MH (residential districts) and any mixed-use district where residential is permitted (UBD, CBD, T, MX, MNC, ENC, etc.) must permit Type B family child care homes by-right. Per Schedule 150.700.4 line 1.h ('Family day care home for 1-6 children (type B)') parking is treated as 1 drop-off space + residential requirement — code reflects use is permitted (parking schedule exists for it). Any code language requiring conditional-use or special-exception treatment in these residential districts is legally unenforceable post-2025-01-01.
OH-3781.184applies
Qualifying condition
ORC §3781.184 incorporates 42 U.S.C. §5415 (National Manufactured Housing Construction and Safety Standards Act) as the exclusive construction/safety standards for manufactured homes in Ohio. Applies statewide regardless of charter status, including Dayton as a charter municipal corporation. Dayton's MH (Manufactured Home) District (§150.315) regulates placement, lot size, density (≤8 du/ac in MH community), and skirting, but cannot impose construction standards that conflict with federal HUD standards.
Effect
Dayton Zoning Code §150.315 (Manufactured Home District) cannot impose construction standards on manufactured homes (roof pitch, wall thickness, materials) that conflict with federal HUD standards. Placement / zoning discretion for manufactured-home communities remains local (8-acre minimum tract, ≤8 du/ac density, 50 ft front setback, 25 ft setback from residential boundaries per §150.315.3).
Non-applicable laws (4)
OH-713-Municipal-Zoning-Enablingunder_review
Qualifying condition
Dayton is a charter municipal corporation (charter in continuous operation since 1913; explicitly listed as a charter city in zoning/us/ohio/preemptions.md and state-overlays/ohio.json roster). ORC Chapter 713 (§§713.06–713.15) supplies procedural enabling authority for zoning in NON-charter Ohio municipalities. Per Ohio preemptions.md framing, charter cities are not procedurally bound by Chapter 713 except where it codifies a 'general law'.
Effect
Chapter 713 procedural floors (e.g., §713.12 30-day public hearing notice, §713.11 BZA structure) do not bind Dayton procedurally; the Charter and Zoning Code §§150.110–150.140 (Admin / Site Design Review / Appeals / Amendments / Fees) govern procedure. §713.15 (nonconforming-use floor) is evaluated as a substantive general-law floor in the next entry.
OH-519.212-Township-MH-Zoningunder_review
Qualifying condition
ORC §519.212 (permanently sited manufactured home zoning preemption) applies to TOWNSHIPS only — does NOT extend to municipal corporations. Dayton is a municipal corporation. Counterpart §303.212 applies to counties (unincorporated territory), also not applicable.
Effect
Dayton retains full zoning discretion over manufactured-home placement under home rule + charter. No state-level by-right requirement reaches the Zoning Code for permanently sited manufactured homes. Dayton's MH District is the local choice.
OH-519.21-Township-Agriculturalunder_review
Qualifying condition
ORC §519.21 agricultural preemption applies to TOWNSHIPS only; §303.21 to counties. Dayton is a municipal corporation. These township/county preemptions structurally do not reach the corporate limits of a city.
Effect
Dayton retains full zoning discretion over agricultural uses within corporate limits. SR-1 district permits agricultural uses with up to 7 accessory buildings on 10+ acre lots per §150.305.5(B)(3) — local choice, not a state-preemption requirement.
OH-STR-preemptionunder_review
Qualifying condition
Ohio SB 104 / HB 109 (136th GA) short-term-rental preemption bills are PENDING in committee as of May 2026 — not enacted. No statewide STR zoning preemption exists.
Effect
No state preemption. Dayton may license, zone, cap, or restrict STRs via its Zoning Code or separate R.C.G.O. chapter.

Adopted building codes

Statewide

IBC
2021
IRC
2018
NEC
2023
IFC
2021
IECC (Residential)
2018
IECC (Commercial)
2021

Click a code label to open its state-by-state adoption atlas.

Quirks & notes

  • CBD (Central Business District) has NO maximum building height per Schedule 150.320.4 — explicitly 'None' on the row (2) Maximum Building Height for CBD. This is a true high-rise-permissive provision; combined with 100% lot coverage + 0 ft setbacks (front max 10 ft, side/rear 0 ft), it creates an extremely permissive downtown core for tall mixed-use towers — a development envelope more typically seen in major-metro CBDs than mid-size Ohio cities. Modeling tall-building feasibility in CBD is bounded only by FAA Part 77 surfaces (Dayton International to the north, Wright-Patterson to the east), structural / market constraints, and §150.320.5 parking (which is also waived for non-MF uses). — [c§Schedule 150.320.4 (CBD row); c§Schedule 150.320.3; c§§150.320.5(A)]
  • I-2 (General Industrial) ALSO has NO maximum building height per Schedule 150.340.4 — 'None' on the baseline row. Drops to 50 ft only when adjacent to a residential district. This is a high-severity quirk for industrial-massing modeling: tall industrial / data-center / logistics buildings have no code-level height ceiling in I-2 as long as they are not directly adjacent to residential. CI district also has no max height when >150 ft from CI boundary per Schedule 150.335.4. — [c§Schedule 150.340.4 (I-2 row); c§Schedule 150.335.4 (CI)]
  • Multi-Family Residential Districts (SMF/EMF/MMF) have NO maximum density per §150.310.3(E) — explicit statement 'In Multi-family Residential Districts, no maximum density is proscribed.' Density is governed by lot coverage (40/50/65%), setbacks, and height + Residential Contextual Standards (§150.310.10). Modeling MF feasibility cannot use a du/ac ceiling — must work from coverage × height × min unit size derived from §1204.10 etc. Building-form changes the lot-area math materially: SMF single/two-family use = 5,000 sf min lot; SMF multi-family use = 2 acres (87,120 sf) min lot — a 17.4x jump. — [c§§150.310.3(B/D)/(E); c§§150.310.5]
  • EMF/MMF max building height is ADJACENCY-TIERED per Schedule 150.310.5: 40 ft if proposed development abuts ANY single-family residential district AND uses only the minimum side/rear setbacks; 50 ft (EMF) or 60 ft (MMF) baseline; reduced to 50 ft / 50 ft within 200 ft of a Mature/Eclectic Residential district; reduced to 40 ft / 40 ft within 200 ft of a Suburban Residential district. The height a proposed MF building can reach depends not only on its zoning district but also on its distance from the nearest SF residential district boundary — a contextual zoning provision that interacts with adjacency rather than just site characteristics. — [c§Schedule 150.310.5; c§§150.310.5(C)(2)]
  • Front setbacks in Eclectic and Mature residential districts (ER-3, ER-4, MR-5) are CONTEXTUAL — equal to the average front setback of the 4 lots immediately on either side of the subject lot per §150.305.3(C)(1). No fixed numeric minimum. Same applies to EMF/MMF (§150.310.4(E)). Modeling buildable depth in these districts requires knowledge of the surrounding parcels' existing setbacks, not just zoning-district code. — [c§§150.305.3(C); c§§150.310.4(E)]
  • Maximum FRONT setbacks rather than minimums in downtown and commercial districts: UBD/CBD = 10 ft max (Schedule 150.320.3); MNC/MGC = 10 ft max (§150.325.3(D)); ENC/EGC = 20 ft max (§150.325.3(G)); SNC = 50 ft max (§150.325.3(F)); MX = 15 ft max (Schedule 150.330.3); T = 15 ft max. These are pull-to-street provisions that force buildings to occupy the build-to-line, similar to form-based code intent. SGC has no maximum but requires a 30-ft landscape area parallel to ROW if >50 ft setback (§150.325.3(E)). — [c§Schedules 150.320.3, 150.325.3 (Mature/Eclectic/Suburban variations), 150.330.3]
  • Side and rear setbacks in commercial districts (MNC/ENC/SNC/MGC/EGC/SGC) are 0 ft except when adjacent to residential — but the adjacency setback varies by residential context: Mature residential triggers 3-20 ft, Eclectic triggers 10-20 ft, Suburban triggers 15-20 ft (per Schedule 150.325.3). Modeling commercial massing requires checking what residential district (if any) is adjacent to each side/rear lot line. — [c§Schedule 150.325.3 rows (2)(b)/(c)]
  • v1 record carried TEMPLATE-BLEED — every district had identical 5000/35/0.5/25/25/10 values (min lot SF / max height ft / lot coverage decimal / front setback / side setback / rear setback) with all confidence flagged 'p' (partial). This is the FM-12 template-bleed signature documented in SUBAGENT.md (detect_template_bleed() flips profile to 'corrupted' if 3+ districts share 5+ identical dimensional values across 3+ categories). All 17 v1 districts shared values across res_sf / res_mf / com / ind categories — a hard corruption flag. The actual Dayton Zoning Code has NO single district with all those values: actual SR-1 = 7,000 / 40 / 40% / 25 / 5 / 30 ft. Lot coverage in Dayton is expressed as a percentage (40-100%), not the decimal 0.5 in v1. v2 captures all distinct values from primary tables. — [c§Schedules 150.305.3, 150.310.3, 150.320.3, 150.325.3, 150.330.3, 150.340.3 (all primary dimensional tables)]
  • v1 record was MISSING 5 districts that exist in the current code per §150.300.1: ER-3 (Eclectic Single-Family), MR-5 (Mature Single-Family), CBD (Central Business District — a critical omission given CBD's no-max-height permissiveness), MH (Manufactured Home), CI (Campus-Institutional), BP (Business Park). v1 had only 17 districts; current code has 25 base districts + 6 overlay districts = 31 districts/overlays total. v2 captures the 22 most material base districts as district records + 6 overlays as overlay records. — [c§§150.300.1 Districts Established]
  • v1 record had an 'Airport' overlay with type 'AP' and a 100 ft height cap. The current code's AP District is a primary base district (§150.343) covering Dayton International Airport property only, with NO local height cap (deferred to FAA-approved Master Plan + 14 CFR §77). The v1 100 ft cap was fabricated. Wright-Patterson AFB AICUZ is a SEPARATE federal overlay (federal_overlay_refs in v2) and partially overlaps eastern Dayton — but Dayton's local code does not carry a substantive AICUZ overlay district. The v1 conflation of WPAFB-aware-overlay with §150.343 AP District was incorrect. — [c§§150.343 (AP District); c§14 CFR §77; c§WPAFB 2022 AICUZ Update]
  • Wright-Patterson AFB AICUZ partially overlaps eastern Dayton city limits per the 2022 AICUZ Update and Wright-Patterson Council of Governments materials. Dayton is one of 6 WPCOG charter members (with Beavercreek, Fairborn, Huber Heights, Riverside, Bath Township). However, Dayton's Zoning Code Chapter 150 does NOT carry a substantive AICUZ overlay district — only a procedural notice provision in §150.120.4 requires WPAFB notice on certain BZA variance applications. Per FM-P (zoning/skills/zoning-research/SUBAGENT.md): federal overlays (AICUZ, Part 77, SFHA) route to federal_overlay_refs, NOT preempted_by_state. The AICUZ entry sits in federal_overlay_refs[0]. — [c§§150.120.4 (BZA notice procedure); c§WPAFB 2022 AICUZ Update; c§Wright-Patterson AFB Compatibility Use Plan (Final Dec 2024)]
  • Source Water Protection districts (WO + WP) per §150.363 protect Dayton's potable water supply (the Great Miami Buried Valley Aquifer is one of the most productive aquifers in the US). Critical prohibited-uses list per §150.363.2(E) bans 23 use types including chlorinated compounds and PFAS (PFOA/PFOS — added in the 2015 amendment Ord 31426-15), bulk fuels storage, underground injection wells, CAFOs, dry wells, hazardous liquid pipelines, infectious waste, chemical/pharmaceutical manufacturing, plating, recycling, salt piles (unless impermeable-floor enclosed), sand/gravel operations, indoor self-storage, solid waste composting, underground storage tanks, and vehicle fueling stations. WP is a true overlay over base zoning (use prohibitions added; base dimensions preserved); WO is a primary district on city-owned water-facility property (TMDI cannot be increased). This is a high-severity quirk for any industrial / commercial / fueling-station site selection in the protection area. — [c§§150.363.2(E), 150.363.1(A)/(B); c§R.C.G.O. Chapter 53]
  • Historic Overlay (§150.345.12(D)) sets a lot coverage FLOOR — '3,000 sf OR the maximum lot coverage of the underlying zoning district, whichever is GREATER.' This is a coverage uplift for small lots in historic districts (3,000 sf is more than 40% of a 7,000 sf SR-1 lot), not a coverage cap. Combined with the contextual height rule (§150.345.12(A): within 10% of streetscape average), historic overlay can either enable or constrain redevelopment depending on existing streetscape character. — [c§§150.345.12(A)/(D)]
  • Dayton is governed by a Charter in continuous commission-manager governance since 1913 — Dayton was the first major US city to adopt the commission-manager form of government. This is a strong charter-city case for OH home-rule preemption analysis: ORC Chapter 713 procedural provisions do not bind Dayton; only general-law substantive floors (§713.15 nonconforming, §5104.054 Type B child care, §3781.184 HUD MH construction) reach the Zoning Code. The Ohio overlays.json roster and preemptions.md both explicitly list Dayton as a charter city. — [c§Ohio Const. Art. XVIII §§3, 7; c§Dayton City Charter (continuous since 1913); zoning/us/ohio/preemptions.md#charter-cities; zoning/us/ohio/overlays.json#OH_HOME_RULE_ART_XVIII]

Formulas

Definitions

min_lot_sf
Minimum lot area per §§150.305.3, 150.310.3, 150.320.3, 150.325.3, 150.330.3, 150.340.3, 150.315.4 (per district). For SMF multi-family with multi-family use, jumps from 5,000 sf (single/two-family use baseline) to 2 acres (87,120 sf) per Schedule 150.310.3(D) — building-form-varying.
min_lot_width_ft
Min lot width per Schedule 150.305.3 (SF residential): SR-1=70 ft, SR-2=60 ft, ER-3=50 ft, ER-4=40 ft, MR-5=30 ft. Most nonresidential = 0 ft.
max_height_ft
Max building height per Schedule 150.305.4 (SF=40 ft), 150.310.5 (MF; varies by adjacency), 150.320.4 (UBD=65 ft; CBD=None — no max), 150.325.4 (Commercial=40 ft except SGC=50 ft), 150.330.4 (T=40 ft; MX=65 ft with adjacency bonuses), 150.335.4 (CI=65 ft within 150 ft of CI boundary, None beyond), 150.340.4 (I-1=65 ft; I-2=None; BP=65 ft).
lot_coverage_pct
Per Schedule 150.305.3 (SR-1/SR-2=40%, ER-3/ER-4=50%, MR-5=65%); Schedule 150.310.3(B/D) (SMF=40%, EMF=50%, MMF=65%); Schedule 150.320.3 (UBD/CBD=100%); Schedule 150.325.3 (all commercial=100%); Schedule 150.330.3 (T=75% residential / 100% non-residential, MX=100%); Schedule 150.340.3 (I-1/I-2/BP=100%).
setback_front_ft
Min front setback per district Schedule. SF residential (SR-1/SR-2)=25 ft; ER-3/ER-4/MR-5 use contextual front setback (§150.305.3(C) — average of 4 adjacent lots' setbacks). MF SMF=25 ft; EMF/MMF contextual. UBD/CBD max 10 ft (no min). Commercial varies (Mature 0–10 ft / Eclectic 0–20 ft / Suburban 10–50 ft or None).
setback_side_ft
Per Schedule 150.305.3 (each side): SR-1/SR-2=5 ft, ER-3=4 ft, ER-4/MR-5=3 ft. MF: SMF=5 ft, EMF=4 ft, MMF=3 ft (single/two-family use). Multi-family use: 25 ft each side per 150.310.4(D). Commercial: 0 ft except adjacent to residential (3 ft Mature, 10 ft Eclectic, 15–20 ft Suburban). Industrial I-1/I-2: 0 ft except 25–30 ft adjacent to residential.
setback_rear_ft
Per Schedule 150.305.3: 30 ft for ALL SF districts (SR-1 through MR-5). MF single/two-family: 25 ft. MF multi-family: 25 ft from project boundary. UBD/CBD: 0 ft. Commercial: 0 ft except 3–20 ft adjacent to residential. Industrial: 0 ft except 25–30 ft adjacent to residential.
max_density_du_ac
SF: §150.305.3 Note [1] caps SR-1 'detached cluster' at 4.5 du/ac; Note [2] caps SR-2 detached cluster at 5.5 du/ac; standard SF detached has no stated density cap (implicit via min lot area). MF: §150.310.3(E) explicitly states 'no maximum density is proscribed' for SMF/EMF/MMF — density is governed by lot coverage + setbacks + height + Residential Contextual Standards. MH community: §150.315.3(D) caps at 8 du/ac. PD: §150.350.14 — density of underlying district unless modified per Planned Development approval.
far
not_found_in_code — Zoning Code does not express FAR per district in any dimensional schedule. Capacity governed by lot coverage + height + setbacks; FAR not used as a regulatory tool in Dayton.
parking_sf
Per Schedule 150.700.4 line 1.b: 2.0 spaces per dwelling unit for single-family detached. Line 1.d: 2.0 per du for single-family attached. Line 1.c: 2.0 per du + 1 per 4 du for detached cluster (visitor parking).
parking_mf
Per Schedule 150.700.4 line 1.f: 1.0 space per dwelling unit + 1 visitor space per 10 dwelling units for multi-family dwelling. Line 1.g 'Neighborhood Multi-Family Dwelling' = 1.0 per du flat. UBD/CBD §150.320.5(A): no parking required for permitted uses except multi-family & single-family attached in UBD = 0.5 per du.
parking_office
Per Schedule 150.700.4 (Business and Professional Offices, not extracted verbatim this pass — defer to §150.700 detail).
parking_retail
Per Schedule 150.700.4 (Retail not extracted verbatim this pass — defer to §150.700 detail).

Capacity calculations

implied_max_du_ac_sr1_sf_detached_cluster
4.5
implied_max_du_ac_sr2_sf_detached_cluster
5.5
mh_community_max_du_ac
8.0
ubd_max_height_ft
65
cbd_max_height_ft_unbounded
True
buildable_width_ft_sr1
lot_width_ft - 5*2 (side setbacks 5 ft each)
buildable_depth_ft_sr1
lot_depth_ft - 25 - 30 (front + rear setbacks)
buildable_width_ft_mr5
lot_width_ft - 3*2 (side setbacks 3 ft each — Mature urban context)

Massing explorer

Interactive 3D comparison across every district. Drag to orbit, scroll to zoom, use the slider to walk districts, and toggle applicable overlays in the right-side panel.

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District Category Height FAR Coverage Setbacks Parking Density Min lot Overlays

Sources & references

Citations
  1. [1] §Schedule 150.305.3 row (2)(a)
  2. [2] §Schedule 150.305.3 row (2)(b) each side
  3. [3] §Schedule 150.305.3 row (2)(c)
  4. [4] §Schedule 150.305.3 (single-family dwelling detached row)
  5. [5] §§150.305.4(A)(1)
  6. [6] §Schedule 150.700.4 line 1.b (Single-Family Dwelling, Detached: 2 per dwelling unit)
  7. [7] §Schedule 150.305.3
  8. [8] §Schedule 150.305.3 (each side)
  9. [9] §Schedule 150.305.3
  10. [10] §Schedule 150.305.3
  11. [11] §§150.305.4(A)(1)
  12. [12] §Schedule 150.700.4 line 1.b
  13. [13] §Schedule 150.305.3 (each side)
  14. [14] §Schedule 150.305.3
  15. [15] §Schedule 150.305.3
  16. [16] §§150.305.4(A)(1)
  17. [17] §Schedule 150.700.4 line 1.b
  18. [18] §Schedule 150.305.3 (each side)
  19. [19] §Schedule 150.305.3
  20. [20] §Schedule 150.305.3
  21. [21] §§150.305.4(A)(1)
  22. [22] §Schedule 150.700.4 line 1.b
  23. [23] §Schedule 150.305.3 (each side)
  24. [24] §Schedule 150.305.3
  25. [25] §Schedule 150.305.3
  26. [26] §§150.305.4(A)(1)
  27. [27] §Schedule 150.700.4 line 1.b
  28. [28] §Schedules 150.310.4(B)/(D) (SMF front setback is 25 ft regardless of building form)
  29. [29] §Schedules 150.310.4(B)/(D)
  30. [30] §§150.310.5(C)(1) — SMF District max height is 40 ft
  31. [31] §Schedules 150.310.4(B)/(D)
  32. [32] §Schedule 150.310.5 (EMF max 50 ft baseline; reduced to 40 ft if proposed development abuts SF residential and uses min side/rear setbacks per §150.310.5(C)(2)(a))
  33. [33] §Schedules 150.310.4(B)/(D)
  34. [34] §Schedule 150.310.5 (MMF max 60 ft baseline; 40 ft if abutting SF residential with min setbacks; 60 ft if within 200 ft of Mature Residential; 50 ft if within 200 ft of Eclectic Residential; 40 ft if within 200 ft of Suburban Residential)
  35. [35] §§150.315.3(C) — 50 ft from front property line of MH community
  36. [36] §§150.315.3(C) — 25 ft from any property boundary abutting residential; 15 ft from other property boundaries
  37. [37] §§150.315.3(C) (when abutting non-residential)
  38. [38] §§150.315.4(A) — individual manufactured home lot
  39. [39] §§150.315.3(D) — maximum 8 manufactured/mobile homes per acre in MH community
  40. [40] §§150.315.4(D)(1) — 2 spaces per manufactured home lot; also c§Schedule 150.700.4 line 1.j
  41. [41] §Schedule 150.320.3 row (2)(a)(i) — MAXIMUM 10 ft front setback (no minimum)
  42. [42] §Schedule 150.320.3 (0 ft side setback regardless of adjacency)
  43. [43] §Schedule 150.320.3
  44. [44] §Schedule 150.320.4 (UBD max 65 ft; min 15 ft)
  45. [45] §§150.320.5(A) — multi-family and single-family attached uses in UBD shall provide 0.5 space per dwelling unit; permitted uses other than these are not required to provide off-street parking
  46. [46] §Schedule 150.320.3 (MAXIMUM 10 ft front setback)
  47. [47] §Schedule 150.320.3
  48. [48] §Schedule 150.320.3
  49. [49] §§150.320.5(A) — permitted uses (except MF/SF attached in UBD) shall not be required to provide off-street parking per §150.700.5
  50. [50] §Schedule 150.325.3 row (2)(a)(i) — 0 ft minimum; 10 ft maximum per §150.325.3(D)
  51. [51] §Schedule 150.325.3 (0 ft unless adjacent to residential: 3 ft adjacent to SF or MF)
  52. [52] §Schedule 150.325.3 (0 ft unless adjacent to residential: 3 ft)
  53. [53] §§150.325.4(A)
  54. [54] §Schedule 150.325.3 (0 ft min; 20 ft max per §150.325.3(G); 5 ft landscape area if >20 ft setback)
  55. [55] §Schedule 150.325.3 (10 ft adjacent to SF or MF residential)
  56. [56] §Schedule 150.325.3 (10 ft adjacent to residential)
  57. [57] §§150.325.4(A)
  58. [58] §Schedule 150.325.3 (10 ft min; 50 ft max per §150.325.3(F); 30 ft landscape area parallel to ROW required if >50 ft setback)
  59. [59] §Schedule 150.325.3 (15 ft adjacent to residential)
  60. [60] §Schedule 150.325.3 (15 ft adjacent to residential)
  61. [61] §Schedule 150.325.3
  62. [62] §§150.325.4(A)
  63. [63] §Schedule 150.325.3 (0 ft min; 10 ft max per §150.325.3(D))
  64. [64] §Schedule 150.325.3 (3 ft adjacent to residential)
  65. [65] §Schedule 150.325.3 (3 ft adjacent to residential)
  66. [66] §§150.325.4(A)
  67. [67] §Schedule 150.325.3 (0 ft min; 20 ft max per §150.325.3(G))
  68. [68] §Schedule 150.325.3 (20 ft adjacent to residential)
  69. [69] §Schedule 150.325.3 (20 ft adjacent to residential)
  70. [70] §§150.325.4(A)
  71. [71] §Schedule 150.325.3 (10 ft min; None max — but §150.325.3(E) requires 30 ft landscape area parallel to public street if building is set back ≥50 ft from ROW)
  72. [72] §Schedule 150.325.3 (20 ft adjacent to residential)
  73. [73] §Schedule 150.325.3 (20 ft adjacent to residential)
  74. [74] §Schedule 150.325.3
  75. [75] §§150.325.4(B) — SGC max permitted height is 50 ft (higher than other commercial districts at 40 ft)
  76. [76] §Schedule 150.330.3 (10 ft min; 15 ft max)
  77. [77] §Schedule 150.330.3 (10 ft adjacent to Mature, 15 ft Eclectic, 20 ft Suburban residential)
  78. [78] §Schedule 150.330.3 (10/15/20 ft adjacent to residential)
  79. [79] §Schedule 150.330.3
  80. [80] §Schedule 150.330.4
  81. [81] §Schedule 150.330.3 (0 ft min; 15 ft max)
  82. [82] §Schedule 150.330.3 (10/15/20 ft adjacent to Mature/Eclectic/Suburban Residential)
  83. [83] §Schedule 150.330.3 (10/15/20 ft adjacent to residential)
  84. [84] §Schedule 150.330.4 (MX max 65 ft baseline)
  85. [85] §Schedule 150.335.3 row (D)(b) — 10 ft baseline; 15-20 ft adjacent to Mature/Eclectic/Suburban Residential
  86. [86] §Schedule 150.335.3 row (D)(c) — 10 ft baseline; 15-20 ft adjacent to residential
  87. [87] §Schedule 150.335.4 — CI max 65 ft within 150 ft of CI boundary; NO max height when >150 ft from CI boundary; 40-50 ft adjacent to residential
  88. [88] §Schedule 150.340.3 (0 ft min; 15 ft max)
  89. [89] §Schedule 150.340.3 (25 ft adjacent to any residential)
  90. [90] §Schedule 150.340.3 (25 ft adjacent to any residential)
  91. [91] §Schedule 150.340.4 (I-1 max 65 ft; 40 ft adjacent to ANY residential district)
  92. [92] §Schedule 150.340.3 (10 ft min; None max)
  93. [93] §Schedule 150.340.3 (30 ft adjacent to any residential)
  94. [94] §Schedule 150.340.3 (30 ft adjacent to any residential)
  95. [95] §Schedule 150.340.3 (25 ft min; None max)
  96. [96] §Schedule 150.340.3 (30 ft baseline; 30 ft adjacent to any residential — same as baseline)
  97. [97] §Schedule 150.340.3 (30 ft baseline; 30 ft adjacent to any residential)
  98. [98] §Schedule 150.340.3 — '1 acre' minimum lot size
  99. [99] §Schedule 150.340.4 (BP max 65 ft baseline; 50 ft adjacent to any residential)

Research status

Publication gates

primary url presentpassedcode_source populated with amlegal code library URL https://codelibrary.amlegal.com/codes/dayton/latest/dayton_oh and code_source_pdf populated with city-hosted direct PDF URL https://www.daytonohio.gov/DocumentCenter/View/550/City-of-Dayton-Zoning-Code-PDF (fetched and content-extracted this pass; 25,930-line pdftotext output through Sept 17 2025 amendments).
no aggregator citedpassedScan clean: no Zoneomics, Steadily, SitePlanGuide, SitePlanCreator, Propwire, Zonara, or Unzoned references. Only primary sources cited: daytonohio.gov, codelibrary.amlegal.com, codes.ohio.gov, ecfr.gov (via 14 CFR §77 and 44 CFR §60.3), wright-pattcog.com (WPCOG official).
confidence tags full formpassedAll 110+ confirmed numeric claims (22 districts × ~6-8 dimensional fields) carry c§Schedule 150.305.3 / c§Schedule 150.310.3-5 / c§Schedule 150.320.3-4 / c§Schedule 150.325.3-4 / c§Schedule 150.330.3-4 / c§Schedule 150.335.3-4 / c§Schedule 150.340.3-4 / c§Schedule 150.700.4 citations referencing specific § + row/line. All 6 overlay parameter blocks carry §150.345 / §150.350 / §150.355 / §150.363 / §150.343 citations. v1's c/i/p shorthand fully replaced with status enum + citation pair. not_found / not_applicable / partial / not_captured statuses each carry paired companion fields (search_performed / reason / what_is_confirmed+what_is_missing / not_captured_reason).
overlays have parameters trigger confidencepassedAll 6 overlays (HD Historic Overlay HD-1/HD-2/HD-3, PD Planned Development, UP Urban Preservation, WO Well Head Operation, WP Water Protection, AP Airport / Dayton International) carry ordinance_ref, geographic_trigger, parameters[] (5-8 elements each), interaction_with_base, status, citation, narrative_ref. HD / PD / WO / WP / AP confirmed (Zoning Code text directly extracted); UP partial with what_is_confirmed + what_is_missing populated explicitly pending UP district roster + Plan content fetch.
preempt section city specificpassedstate_preemptions_applicable[] lists 8 entries: 4 applies_fully (Home Rule meta, §713.15 nonconforming floor, §5104.054 Type B child care, §3781.184 HUD MH construction), 1 does_not_apply_charter_city (§713 enabling), 2 does_not_apply_municipal (§519.212 township-only MH, §519.21 township-only agriculture), 1 not_yet_law (STR SB 104 / HB 109). Each has qualifying_condition_checked with numeric inputs (population 136,346 per Census 2024 estimate, governance_type municipal_corporation, charter status confirmed via Ohio overlays.json + preemptions.md + 1913 commission-manager continuity) + vintage + threshold. v1 had no preemption block at all — fully created this pass. WPAFB AICUZ routed to federal_overlay_refs per FM-P (NOT preempted_by_state).

Data quality

74%completeness
Documented gaps
  • Floodplain ordinance: separate from Chapter 150 (lives elsewhere in R.C.G.O.); specific chapter number, freeboard above NFIP minimum, floodway prohibitions list, NFIP CID not extracted
  • Historic Overlay specific district roster: HD-1 / HD-2 / HD-3 boundaries and designated lots not enumerated
  • Urban Preservation overlay roster: specific UP districts and their adopted Urban Preservation Plans not enumerated
  • Campus-Institutional Schedule 150.335.3 lot/coverage detail not fully extracted (Schedule 150.335.4 height covered)
  • §150.140 specific nonconforming-use discontinuance period not extracted — §713.15 6-month floor presumed
  • Wright-Patterson AFB AICUZ noise contour + APZ boundary within Dayton city limits not enumerated parcel-by-parcel — flagged at federal_overlay_refs
  • CRA boundary maps not retrieved — has_cra_designation_note flagged partial
  • Schedule 150.700.4 parking ratios for non-residential / specific commercial uses only partially captured (Residential lines 1.a-l verified; lines 6-13 not exhaustively transcribed)
  • Specific dimensional details for the 'detached cluster' SF subtype (Schedule 150.305.3 col (i)-(v)) not exhaustively captured — Notes 1/2 (4.5/5.5 du/ac caps) and Note 3 (600 sf min unit) extracted

Known issues

data:gaps-present

Verification

last_verified_at2026-05-18T08:30:00Z
verifier_specialistverification-pass
verifier_version1.0
verification_resultpassed
atomic_claims_checked64
atomic_claims_passed62
atomic_claims_failed0
atomic_claims_partial2
notesAll dimensional standards for 22 base districts extracted directly from Schedules 150.305.3 (SF res), 150.310.3(B/D) + 150.310.4(B/D) + 150.310.5 (MF res), 150.315.3/.4 (MH), 150.320.3/.4 (Downtown), 150.325.3/.4 (Commercial), 150.330.3/.4 (Mixed-use/Transitional), 150.335.3/.4 (Campus-Institutional), 150.340.3/.4 (Industrial), 150.343 (Airport) in the city-hosted Dayton Zoning Code PDF (daytonohio.gov/DocumentCenter/View/550, 25,930-line pdftotext output, code revised through Sept 17 2025). Parking ratios cite Schedule 150.700.4 directly (Schedule line 1.b: SF detached 2.0/du; 1.f: MF 1.0/du + visitor; 1.j: MH 2.0/du). Overlay parameters cite §§150.345 (Historic), 150.350 (Planned Development), 150.355 (Urban Preservation), 150.363 (Source Water Protection). State preemption entries cross-reference zoning/us/ohio/preemptions.md and state-overlays/ohio.json. Charter-city status confirmed via zoning/us/ohio/preemptions.md + state-overlays/ohio.json explicit listing of Dayton + WebSearch confirmation of 1913 commission-manager continuity. Federal overlays (WPAFB AICUZ, FAA Part 77 for DAY, FEMA NFIP) routed to federal_overlay_refs per FM-P. The two 'partial' atoms: SR-1 du/ac (only detached-cluster subtype has 4.5 du/ac cap, standard SF detached is uncapped) and SR-2 du/ac (only detached-cluster subtype has 5.5 du/ac cap) — both documented as building-subtype-varying. No aggregators cited. v1 fabricated values (5000/35/0.5/25/25/10 across all 17 districts — pure FM-12 template-bleed) NULLED OUT and replaced with primary-source confirmed values.

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