Columbus, OH Zoning

Overview

Columbus operates TWO coexisting zoning code systems simultaneously: (1) Title 33 (Euclidean district scheme, predominant code, governs nearly all city parcels) and (2) Title 34 (2024 Zoning Code, form-leaning rewrite, adopted by Ord. 2111-2024 on July 29, 2024). Title 34 is being rolled out parcel-by-parcel via subsequent rezoning ordinances — it is NOT a uniform replacement of Title 33. This matches the spec-02 'rewrite-in-flight' archetype (LA Ch.1+Ch.1A, Cincinnati Title XI + LDC). v1 omitted Title 34 entirely. Title 33's §3309.12 Floodplain District was repealed by Ord. 2111-2024 — floodplain regulation is now handled outside the zoning code. | sub_flags_raw=[charter-city, title-33-euclidean-legacy, title-34-form-overlay-emerging]

Districts

Confidence: confirmed partial under review not found

Overlays

State preemptions

Adopted building codes

Statewide

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

Quirks & notes

• {"topic": "Two coexisting zoning codes (Title 33 + Title 34)", "detail": "Columbus is in the middle of the multi-year Zone In Columbus rewrite. Ord. 2111-2024 (adopted 2024-07-29) enacted Title 34 (2024 Zoning Code) as an alternate code system; Title 33 remains the predominant code governing nearly all parcels not legislatively rezoned to Title 34. The first wave of Title 34 application was 165 parcels along SR-161 between Worthington and Ponderosa Drive. Underwriting for a Columbus parcel requires checking BOTH codes \u2014 establish current zoning via the Official Zoning Map first."}
• {"topic": "Floodplain district moved out of Title 33", "detail": "Ord. 2111-2024 (2024-07-29) repealed Title 33 \u00a73309.12 Floodplain District. Floodplain regulation in Columbus is now handled outside the zoning code (likely in the building-code chapter of the Codified Ordinances). NFIP federal floor (44 CFR \u00a760.3) continues to apply directly. Diligence: confirm parcel SFHA status via FEMA FIRM panels for Franklin County."}
• {"topic": "v1 was template-bled \u2014 beware historical underwriting outputs", "detail": "v1 of this profile carried identical dimensional values (min_lot=5,000 sf, height=35 ft, lot_coverage=0.5, FAR=0.5, parking=2, front=25 ft, side=25 ft, rear=10 ft) across 25 of 27 districts. This was a converter artifact, NOT a Title 33 feature. Any Columbus underwriting that consumed v1 between 2026-04-07 and 2026-05-18 may have been computed against fabricated district envelopes. R-2F is actually 6,000 sf SF / 3,600 sf two-family (not 5,000); R-rural is 5 acres = 217,800 sf; AR-12 is 3,600 sf/du. v2 nulls out unverified values rather than fabricating."}
• {"topic": "Building line is a function of thoroughfare-plan ROW, not a fixed setback", "detail": "Per \u00a73332.21, the front building line in R-rural / LRR / RRR / RR / SR / R-1 / R-2 / R-3 / R-2F / R-4 / MHD districts equals one-half of the designated right-of-way width of the frontage street per the Columbus thoroughfare plan. If the street is not on the plan, the default is 25 ft. Diligence: pull the thoroughfare-plan ROW classification for each parcel's frontage street(s) \u2014 front setback is variable, not a fixed 25 ft."}
• {"topic": "Rear yard governed by percentage rule, not fixed feet", "detail": "Per \u00a73332.27, rear yard is expressed as a percentage of total lot area (\u226525% commonly cited). This rule does not fit cleanly into a setback_rear_ft schema slot \u2014 recorded as not_captured with reason."}
• {"topic": "Area Commission framework is design-review machinery, not historic-district preemption", "detail": "Title 33 Chs. 3322, 3326, 3327, 3328, 3329, 3331 establish Area Commissions (Driving Park, Greater Hilltop, Italian Village, Near East, North Market, Victorian Village) that recommend on permits, variances, and rezonings. Where a Commission area is also a locally-designated historic district (German Village, Italian Village, Victorian Village, others), CoA-style design review attaches. Diligence: identify which Commission's review applies to each parcel."}
• {"topic": "AR-12 number does NOT encode min lot size in 1,000s sf", "detail": "Columbus's apartment districts (AR-12, ARLD, AR-1, AR-2, AR-3, AR-4, AR-O) use a sequential intensity index, not lot-size-encoded suffixes. The '12' in AR-12 most plausibly relates to the implicit ~12.1 du/ac density derived from \u00a73333.11's 3,600 sf per du rule, but this is naming convention historical context, not a normative density cap."}

Formulas

Definitions

height

Maximum vertical distance from grade to top of structure; measured per Title 33 definitions in Ch. 3303. Detached private garage and carport capped at 15 ft absolute per §3332.38.

lot_coverage

Building footprint area divided by total lot area. Explicit lot_coverage caps are NOT surfaced for most Title 33 base districts in this pass — coverage is implied via setback + envelope geometry and the §3332.27 rear-yard rule. v1 carried 0.5 for all districts; this is a CONVERTER ARTIFACT, not a Title 33 numeric. Demoted.

far

Floor Area Ratio. v1 carried 0.5 for all districts; this is a CONVERTER ARTIFACT, not a Title 33 numeric. Title 33 residential districts do not generally impose FAR caps in the published dimensional tables. Demoted.

du_per_acre

Dwelling units per acre. For SF tier, derived from min_lot_sf-per-unit (43560 / min_lot_sf). For AR-12, computed from §3333.11's 3,600 sf per du = 12.1 du/ac.

building_line_default

Per §3332.21, the building line (front yard) equals one-half of the designated right-of-way width of the frontage street per the Columbus thoroughfare plan; if the street is not on the plan, the default is 25 ft. Applies in R-rural, LRR, RRR, RR, SR, R-1, R-2, R-3, R-2F, R-4, and MHD districts.

rear_yard_general_rule

Per §3332.27 (general Title 33 §), rear yard ≥25% of total lot area (a coverage-based rule, not a fixed-feet rule). Applied generally across residential districts.

Capacity calculations

max_du_sf_district

lot_area_sf / min_lot_area_per_unit_sf (district-specific)

max_du_ar_12

lot_area_sf / 3600

max_du_apartment_complex

lot_area_sf / 20000 (minimum lot floor; district-specific maximum density applies above the floor)

buildable_envelope_sf_approx

(lot_width_ft - 2*setback_side_ft) * (lot_depth_ft - setback_front_ft - setback_rear_ft)

max_stories_approx

max_height_ft / 10

Sources & references

Research status

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