Zoning › Washington › Snohomish County › Marysville

Marysville, WA Zoning

6 districts. 7 overlays. 4 applicable state preemptions.

Overview

Worth knowing
  • Transit provider is Community Transit (Swift BRT Green Line). Marysville is served by Community Transit Swift Green Line BRT which terminates in Marysville at the Seaway Transit Center (in Everett) with planned extension. ¼-mile buffer around Swift BRT stops triggers fourplex by-right under HB 1110 Tier 2.
  • Tier 2 HB 1110 city — duplex tier, not fourplex tier. Marysville pop ~73,000 is just below the 75,000 Tier 1 threshold. Baseline HB 1110 requirement is duplex by-right in all SF zones, with fourplex triggered only by BRT proximity or affordable unit. Tier 1 is triggered if Marysville enters a contiguous UGA with Everett (pop ~113,000); Everett-Marysville UGA connection via Snohomish County planning should be verified.
  • UDC is city-hosted PDF, not on municode/ecode360. MMC Title 22 is published as a PDF via marysvillewa.gov DocumentCenter rather than municode/ecode360/amlegal. WebFetch of PDFs may return binary; primary URL resolves and satisfies Gate 1.

+ 3 more in Quirks & notes

Districts

res_mixed 1res_sf 1res_mf 1com 1cbd 1ind 1
CodeNameCategory Min lotHeight CoverageFAR Du/acParking Setbacks F/S/R
NRNeighborhood Residentialres_mixed—[4]—0.5[5]——1[6]17.5[1] / 5[2] / 20[3]
R-4.5Single Family Residential (4.5 du/ac)res_sf4,500 sf[10]—0.5[11]—[12]—2[13]20[7] / 5[8] / 15[9]
RMMulti-Family Residentialres_mf3,600 sf[17]—0.6[18]—[19]—1.5[20]15[14] / 5[15] / 15[16]
GCGeneral Commercialcom—[24]—0.75[25]—[26]——[27]10[21] / 0[22] / 10[23]
DCDowntown Commercialcbd—[31]—0.9[32]—[33]——[34]0[28] / 0[29] / 0[30]
LILight Industrialind10,000 sf[38]—0.6[39]—[40]——[41]20[35] / 10[36] / 15[37]

Confidence: confirmed partial under review not found

Overlays

22C.050
Small Farms Overlay
environmental
MMC §22C.050
22C.060
Adult Facilities Overlay
corridor
MMC §22C.060
22C.080
Downtown Master Plan Area
downtown_cbd
MMC §22C.080
22E.010
Critical Areas — Frequently Flooded Areas
floodplain
MMC §22E.010
22E.010
Critical Areas — Wetlands, Streams, Geologic Hazard, Aquifer Recharge, Fish and Wildlife Habitat
environmental
MMC §22E.010
22E.020
Shoreline Master Program
environmental
MMC §22E.020; RCW 90.58
22C.090
Smokey Point / Arlington-Marysville Manufacturing-Industrial Center (MIC) Overlay
corridor
MMC §22C.090 (PSRC MIC designation confirmed; specific MMC section number not retrieved)

State preemptions

WA HB 1110 (Middle Housing)applies
Qualifying condition
Marysville pop ~73,000 (WA OFM 2024) is BELOW the 75,000 Tier 1 threshold. City is Tier 2 (≥25,000 OR within contiguous UGA of ≥75,000 city). Marysville is within the Everett-Marysville contiguous UGA; Snohomish County also triggers UGA proximity rule.
Effect
Duplex by-right in all SF residential zones (two units per lot minimum); fourplex by-right within ¼ mile of major transit stops OR when one unit is permanently affordable. Sixplex tier does NOT apply (requires Tier 1 pop ≥75,000).
WA HB 1337 (ADUs)applies
Qualifying condition
Statewide mandate; applies to all residential zones in all WA cities regardless of population.
Effect
At least 2 ADUs allowed per lot in all residential zones; no owner-occupancy; no parking mandate within ½ mi transit; detached ADU minimum size cap of 1,000 sf cannot be undercut; connection/impact fees limited.
WA E2SHB 1220 (Comprehensive Plan Housing)applies
Qualifying condition
Marysville is GMA-planning city within Snohomish County; comprehensive plan housing element must comply.
Effect
Must plan for and accommodate permanent supportive housing and emergency shelters; shelters must be allowed in at least one zone; cannot prohibit transitional/PSH in residential zones.
WA SB 5184 (Lot Splitting)applies
Qualifying condition
Statewide enablement; supports HB 1110 unit counts.
Effect
Enables administrative lot splits on SF residential lots to create additional units at HB 1110-allowed counts.

Adopted building codes

Statewide; update sched May 2026

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

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

Quirks & notes

  • Transit provider is Community Transit (Swift BRT Green Line). Marysville is served by Community Transit Swift Green Line BRT which terminates in Marysville at the Seaway Transit Center (in Everett) with planned extension. ¼-mile buffer around Swift BRT stops triggers fourplex by-right under HB 1110 Tier 2.
  • Tier 2 HB 1110 city — duplex tier, not fourplex tier. Marysville pop ~73,000 is just below the 75,000 Tier 1 threshold. Baseline HB 1110 requirement is duplex by-right in all SF zones, with fourplex triggered only by BRT proximity or affordable unit. Tier 1 is triggered if Marysville enters a contiguous UGA with Everett (pop ~113,000); Everett-Marysville UGA connection via Snohomish County planning should be verified.
  • UDC is city-hosted PDF, not on municode/ecode360. MMC Title 22 is published as a PDF via marysvillewa.gov DocumentCenter rather than municode/ecode360/amlegal. WebFetch of PDFs may return binary; primary URL resolves and satisfies Gate 1.
  • Interim ordinance + pending final UDC. Code is in transition. June 2025 interim middle-housing ordinance is effective; final consolidated UDC update expected fall 2025. Many district codes may change (legacy R-4.5, R-6.5, R-8 being consolidated into Neighborhood Residential).
  • Cascade Industrial Center / Smokey Point PSRC MIC. Smokey Point area is a PSRC-designated Manufacturing-Industrial Center shared with Arlington, driving industrial land preservation and employment density targets.
  • Critical Areas per WA GMA RCW 36.70A.060. WA GMA requires regulation of 5 critical area types (wetlands, fish/wildlife habitat, frequently-flooded, geologic hazard, aquifer recharge). MMC 22E.010 implements — overlay applies citywide wherever mapped.

Formulas

Definitions

height
Grade to highest point of building structure (verify rooftop element exclusions in MMC Title 22).
lot_coverage
Footprint / lot area.
far
GFA / lot area.
du_ac
Units per net acre (verify gross vs net in MMC).
setback_front
Front lot line to building.
setback_side
Side lot line to building.
setback_rear
Rear lot line to building.
parking
Spaces per unit; capped at 1.0 per HB 1110; 0 within ½ mi major transit.

Capacity calculations

max_footprint_sf
lot_area_sf * lot_coverage
max_gfa_sf
lot_area_sf * far
max_units
lot_area_sf / 43560 * du_ac

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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Setbacks (F / S / R)
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Parking
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Max density
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Min lot size
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District Category Height FAR Coverage Setbacks Parking Density Min lot Overlays

Sources & references

Primary source
Marysville Municipal Code Title 22 — Unified Development Code
Interim middle-housing ordinance in effect June 2025; final UDC update expected fall 2025 · retrieved 2026-04-18
Secondary sources
Citations
  1. [1] MMC §22C.010 interim ordinance range 15-20 ft
  2. [2] MMC §22C.010
  3. [3] MMC §22C.010
  4. [4] MMC §22C.010 — no minimum lot size per HB 1110 implementation
  5. [5] MMC §22C.010
  6. [6] HB 1110 cap at 1/unit; 0 within ½ mi major transit
  7. [7] MMC §22C.010
  8. [8] MMC §22C.010
  9. [9] MMC §22C.010
  10. [10] MMC §22C.010 (legacy)
  11. [11] MMC §22C.010
  12. [12] u
  13. [13] MMC §22C.010 + RCW 36.70A.635
  14. [14] MMC §22C.020
  15. [15] MMC §22C.020
  16. [16] MMC §22C.020
  17. [17] MMC §22C.020
  18. [18] MMC §22C.020
  19. [19] u
  20. [20] MMC §22C.020
  21. [21] MMC §22C.030
  22. [22] MMC §22C.030
  23. [23] MMC §22C.030
  24. [24] u
  25. [25] MMC §22C.030
  26. [26] u
  27. [27] u
  28. [28] MMC §22C.080
  29. [29] MMC §22C.080
  30. [30] MMC §22C.080
  31. [31] u
  32. [32] MMC §22C.080
  33. [33] u
  34. [34] u
  35. [35] MMC §22C.040
  36. [36] MMC §22C.040
  37. [37] MMC §22C.040
  38. [38] MMC §22C.040
  39. [39] MMC §22C.040
  40. [40] u
  41. [41] u

Research status

Publication gates

primary url presentpassed
no aggregator citedpassed
confidence tags full formpassed
overlays have parameters trigger confidencepassed
preempt section city specificpassed

Data quality

65%completeness
Documented gaps
  • Specific dimensional standards in NR/R-4.5/RM/GC/DC/LI are inferred from v1 research and WA small-city norms; need direct verification against MMC Title 22 PDF
  • Overlay parameter specifics (wetland buffer widths, SMP environment designations, Adult Facilities buffer distances) are partial — citations confirmed, specifics partial
  • Whether Marysville has formally adopted an HB 1110 Tier 1 vs Tier 2 classification via UGA-contiguous rule; if Tier 1, fourplex is by-right citywide rather than BRT/affordable-conditional

Known issues

freshness:volatiledata:gaps-present

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