Do you need a permit for a shed in Seattle, WA?
It depends on size and placement.
Seattle's exemption is measured by roof footprint: 120 sq ft or less.
Sheds are capped at 12 ft tall by zoning.
A shed in or near an environmentally critical area always needs a permit.
Rules last checked by a person on October 19, 2026. Guidance only; confirm with Seattle before you build.
Check your exact lot
Setbacks depend on your zoning district, and a flood zone can change the permit answer. Enter your address to see both.
Permits a shed can need in Seattle
| Permit | When it applies |
|---|---|
| Building permit | Seattle exempts only single-story, detached storage sheds with 120 sq ft of roof or less, on a slab, piers or soil, away from critical areas. |
| Floodplain development permit | If the lot is in a FEMA special flood hazard area, communities in the flood insurance program must permit all development there, sheds included. |
| Electrical permit | Running power to the shed needs an electrical permit even when the shed itself is exempt.Confidence: medium |
Neighborhood Residential (NR1, NR2, NR3)
| Height | 12 ft max |
|---|---|
| Front setback | Usually can't sit within 10 to 15 ft of the front lineConfidence: medium |
| Side setback | 5 ft from side linesConfidence: medium |
| Rear yard | Sheds may sit in the rear yard (the back 10 to 15 ft)A setback agreement with your neighbor may be required.Confidence: medium |
| Lot coverage | All structures together, including decks over 36 in, are capped at 50-60% depending on the lotConfidence: medium |
Local details
- Most permitted sheds need only a subject-to-field-inspection permit. Over 750 sq ft, beams spanning more than 14 ft, or a critical area means a full construction permit.
- Call 811 at least a few days before you dig footings or post holes. Utility locating is free.
- HOA covenants and deed restrictions can be stricter than city rules. Check yours before you build.
How to apply
- Seattle Services Portal
- SDCI common projects
- SMC 23.44, Neighborhood Residential
- Phone: (206) 684-8600
Questions people ask
- When does a shed need a building permit in Seattle?
- Seattle exempts only single-story, detached storage sheds with 120 sq ft of roof or less, on a slab, piers or soil, away from critical areas. A detached storage shed with 120 sq ft of roof or less, on a slab, piers or soil and away from critical areas, needs no permit. Zoning limits still apply.
- How far from the property line can a shed go in Seattle?
- Front setback: Usually can't sit within 10 to 15 ft of the front line. Setbacks vary by zoning district; check your exact lot for the district that applies.
- Where do I apply for a shed permit in Seattle?
- Apply through Seattle Services Portal, or call (206) 684-8600.
Sources
- Seattle SDCI, Sheds. Checked 2026-10-19.
You don't need a permit to build a shed if... the total area (or footprint) of the shed's roof is 120 square feet or less... single-story... sits on a simple concrete slab, pier blocks, or soil... not attached... not in or near an environmentally critical a…
- 44 CFR 59.1, definition of development (NFIP). Checked 2026-10-19.
Development means any man-made change to improved or unimproved real estate, including but not limited to buildings or other structures...
- 44 CFR 60.3, floodplain management criteria. Checked 2026-10-19.
Require permits for all proposed construction or other development in the community...
- 2024 IRC R105.2, Work exempt from permit (text published by the City of Benson, AZ). Checked 2026-10-19.
One-story detached accessory structures, provided that the floor area does not exceed 200 square feet. Fences not over 7 feet high. Decks not exceeding 200 square feet in area, that are not more than 30 inches above grade at any point, are not attached to a…