Zoning › Washington › Snohomish County › Marysville

Marysville, WA Zoning

6 districts. 7 overlays. 4 applicable state preemptions.

Overview

Worth knowing

+ 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——————17.5[1] / 5[2] / 20[3]
R-4.5Single Family Residential (4.5 du/ac)res_sf4,500 sf[7]———[8]——20[4] / 5[5] / 15[6]
RMMulti-Family Residentialres_mf3,600 sf[12]———[13]——15[9] / 5[10] / 15[11]
GCGeneral Commercialcom—[17]———[18]——10[14] / 0[15] / 10[16]
DCDowntown Commercialcbd—[22]———[23]——0[19] / 0[20] / 0[21]
LILight Industrialind10,000 sf[27]———[28]——20[24] / 10[25] / 15[26]

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

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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Max height
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Floor area ratio
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Lot coverage
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Setbacks (F / S / R)
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Parking
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Max density
— du/ac
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Min lot size
— sf
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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
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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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