Shed Permit in Seattle, Washington
It depends
Sometimes, depending on the project
Before building a shed over 120 square feet or near an environmentally critical area in Seattle
Issued bySeattle Department of Construction and Inspections
By Mario Bailey, verified against official sources
- Typical job value
- $103,577
- declared valuation
Quick answer
In Seattle a one-story detached shed with a roof footprint of 120 square feet or less on a concrete slab or pier blocks does not require a building permit. Sheds over 120 square feet or in environmentally critical areas such as steep slopes or wetlands require a permit from SDCI. Zoning setbacks and lot coverage limits apply regardless of permit status.
Typical threshold: one-story detached storage sheds with a roof footprint of 120 square feet or less on a slab foundation and not in an environmentally critical area do not require a permit.
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When a permit is usually needed
Before building a shed over 120 square feet or near an environmentally critical area in Seattle
What a shed permit costs in Seattle
How Seattle compares in Washington
That is the strictest shed permit threshold among the Washington jurisdictions we have verified: Bellevue, Clark County, King County, Pierce County, Snohomish County, and Tacoma allow up to 200.
| Jurisdiction | Permit needed? | Threshold |
|---|---|---|
| Bellevue | It depends | detached storage sheds playhouses or gazebos with a floor area of 200 square feet or less do not require a building permit; structures over 200 square feet require a permit |
| Clark County | It depends | Sheds over 200 square feet require a building permit; sheds of 200 square feet or less are exempt if they meet setbacks and easements, but any size shed in a mobile home park or multi-family zone requires a permit. |
| King County | It depends | storage sheds 200 sq ft or less as accessory to a residential house do not require a building permit in unincorporated King County; sheds over 200 sq ft require a permit |
| Pierce County | It depends | One-story detached accessory structure used as an unheated tool or storage shed, playhouse, or similar use is exempt if its floor area is 200 sq ft or less and it is at least 3 feet from a property line; larger or closer structures require a building permit. |
| Seattlethis page | It depends | one-story detached storage sheds with a roof footprint of 120 square feet or less on a slab foundation and not in an environmentally critical area do not require a permit |
| Snohomish County | It depends | one-story detached accessory structure not used for human habitation (tool/storage shed, playhouse) exempt if floor area is 200 sq ft or less and sidewalls 9 ft or less inside the Urban Growth Area (UGA), or 400 sq ft or less and sidewalls 11 ft or less outside the UGA; larger structures require a building permit |
| Tacoma | It depends | one-story detached accessory structures with a floor area of 200 square feet or less do not require a building permit; structures over 200 square feet require a permit |
Closest shed permit thresholds outside Washington
Jurisdictions we cover whose limit sits nearest Seattle's 120 sq ft.
- Alameda County, California, Floor area of a one-story detached tool or storage shed accessory to a house, at which the building permit exemption stops
- Aurora, Colorado, shed floor area at which a building permit is required
- Baltimore County, Maryland, accessory structure floor area
- Boston, Massachusetts, one-story detached accessory sheds used for tools or storage are exempt if floor area does not exceed 120 sq ft
How to apply in Seattle
In Seattle, a residential shed permit application, once the shed is large enough to require one, is a set of construction documents that show what will be built and prove it meets the adopted residential code. In practice that means a written permit application, a scaled site plan locating the shed and its distances to the property lines, and construction documents covering the shed's foundation or anchoring system and its framing.
What most shed permit applications include:
- For Seattle, a written permit application identifying the proposed work and describing the property by its address or legal description, filed with the building department before construction begins (IRC R105.3).
- For Seattle, a scaled site plan showing the shed's size and location and its dimensioned distances to all property lines so required setbacks can be verified before the permit is issued (IRC R106.2).
- Construction documents showing the shed's foundation: freestanding accessory structures at or under the code's small-structure size and eave-height limits (600 square feet and a 10 foot eave height in the model code) are exempt from continuous footings but must still be shown supported on undisturbed soil or engineered fill and anchored to resist wind-induced uplift and overturning (IRC R403.1).
- Where the shed does sit on a continuous foundation with a wood sill plate, anchor bolt or approved strap details tying the sill plate to the foundation (IRC R403.1.6).
- Roof framing details showing the rafter-to-wall or truss-to-wall connections, since even a shed exempt from continuous footings must be anchored to resist wind-induced uplift and overturning (IRC R403.1; R802.11).
General submittal guidance from IRC R105.3 (permit application), R106.2 (site plan), R403.1 (footings and anchorage for accessory structures), and R403.1.6 (sill anchorage), 2021 IRC. Source. Seattle Department of Construction and Inspections sets the exact checklist for Seattle.
Where to apply in Seattle:
Seattle Department of Construction and Inspections
- 700 5th Ave Suite 2000, Seattle, WA 98104
- Phone: (206) 684-8600
Shed Permit in Seattle compared with nearby Washington localities
| Locality | Permit needed? | Threshold | What each Washington schedule says | Verified |
|---|---|---|---|---|
| Seattle | It depends | one-story detached storage sheds with a roof footprint of 120 square feet or less on a slab foundation and not in an environmentally critical area do not require a permit | Sheds of 120 square feet or less that are single story, unattached, and storage-only... | |
| Bellevue | It depends | detached storage sheds playhouses or gazebos with a floor area of 200 square feet or less do not require a building permit; structures over 200 square feet require a permit | No separate shed line item | |
| Clark County | It depends | Sheds over 200 square feet require a building permit; sheds of 200 square feet or less are exempt if they meet setbacks and easements, but any size shed in a mobile home park or multi-family zone requires a permit. | Fees are established by county ordinance and calculated automatically during the... | |
| King County | It depends | storage sheds 200 sq ft or less as accessory to a residential house do not require a building permit in unincorporated King County; sheds over 200 sq ft require a permit | Most permit fees increased approximately 14% on January 1 2026 plus a $126 application... | |
| Pierce County | It depends | One-story detached accessory structure used as an unheated tool or storage shed, playhouse, or similar use is exempt if its floor area is 200 sq ft or less and it is at least 3 feet from a property line; larger or closer structures require a building permit. | Building permit fee follows PCC Table 17C.10-1-B (valuation based): $69.00 for... |
Inspections and closing out your permit
In Seattle, a permitted shed is inspected in stages as it goes up: the foundation or the anchors that hold it down before they are covered, the framing before it is enclosed, and a final inspection once the shed is finished. Each stage checks the items that would be hidden or unsafe if skipped.
- Foundation or anchor inspection in Seattle: called after any required footings, piers, or ground anchors are set and any forms or reinforcing steel are in place, but before concrete is placed, so the foundation or anchoring system can be verified before it is covered (IRC R109.1.1).
- Frame inspection in Seattle: after the shed is framed, sheathed, and braced, the inspector checks the framing, bracing, fasteners, and the roof connections that resist wind uplift, before those elements are covered (IRC R109.1.4 frame inspection; R403.1 anchorage).
- Final inspection in Seattle: made after the permitted work is complete and before the shed is used; work may not proceed past any inspection stage without the building official's approval (IRC R109.1.6 final inspection; R109.4 approval required).
- In Seattle: for a pre-fabricated or kit shed, the manufacturer's installation instructions must be on site at the time of inspection so the inspector can confirm the anchoring and assembly match the design (IRC R106.1.2).
Schedule each inspection in advance and pass the final before you use the work or close the permit. Request inspections through the Seattle permit portal or by phone at (206) 684-8600.
Inspection sequence from IRC R109.1.1 (foundation inspection), R109.1.4 (frame inspection), R109.1.6 (final inspection), and R106.1.2 (manufacturer's instructions on site), 2021 IRC. Source. An open permit left un-inspected can surface later in a title search or home sale.
Your Shed Permit checklist for Seattle
- Confirm the requirement. Sometimes, depending on the project. Typical threshold: one-story detached storage sheds with a roof footprint of 120 square feet or less on a slab foundation and not in an environmentally critical area do not require a permit. Usually needed: Before building a shed over 120 square feet or near an environmentally critical area in Seattle.
- Budget the fee. Sheds of 120 square feet or less that are single story, unattached, and storage-only need no permit per SDCI's Sheds page; larger sheds take a subject-to-field-inspection construction permit priced by valuation, minimum $292, plus a 5% technology fee, per the 2026 Fee Subtitle. Official fee schedule.
- Apply. In Seattle, a residential shed permit application, once the shed is large enough to require one, is a set of construction documents that show what will be built and prove it meets the adopted residential code. In practice that means a written permit application, a scaled site plan locating the shed and its distances to the property lines, and construction documents covering the shed's foundation or anchoring system and its framing. Start at the Seattle permit portal.
- Keep the office details handy. Seattle Department of Construction and Inspections. Phone: (206) 684-8600. Address: 700 5th Ave Suite 2000, Seattle, WA 98104.
- Plan for inspections. In Seattle, a permitted shed is inspected in stages as it goes up: the foundation or the anchors that hold it down before they are covered, the framing before it is enclosed, and a final inspection once the shed is finished. Each stage checks the items that would be hidden or unsafe if skipped.
Compiled from the official sources on this page. Last checked .
Permitting activity in Seattle
In 2024, Seattle authorized permits for 5,895 new residential housing units (405 single-family, 5,490 in multi-family buildings), valued at $1.2B, up from 5,299 the year before. That works out to about 7.7 permits per 1,000 residents.
Source: U.S. Census Bureau, Building Permits Survey, 2024 annual data · population 769,714.
About Seattle
Seattle has about 382,933 housing units. The median home is valued at $912,100, against a median household income of $121,984. About 44% of homes are owner-occupied, and the typical home was built around 1974.
Source: U.S. Census Bureau, American Community Survey 2023 5-year.
Frequently asked questions
- Do you need a shed permit in Seattle?
- In Seattle a one-story detached shed with a roof footprint of 120 square feet or less on a concrete slab or pier blocks does not require a building permit. Sheds over 120 square feet or in environmentally critical areas such as steep slopes or wetlands require a permit from SDCI. Zoning setbacks and lot coverage limits apply regardless of permit status. One-story detached storage sheds with a roof footprint of 120 square feet or less on a slab foundation and not in an environmentally critical area do not require a permit. Always confirm with the office before starting.
- How much does a shed permit cost in Seattle?
- Sheds of 120 square feet or less that are single story, unattached, and storage-only need no permit per SDCI's Sheds page; larger sheds take a subject-to-field-inspection construction permit priced by valuation, minimum $292, plus a 5% technology fee, per the 2026 Fee Subtitle. See the official fee schedule for current amounts.
- Where do you apply for a shed permit in Seattle?
- You can apply through the Seattle permit portal or contact the Seattle Department of Construction and Inspections directly. The links are listed on this page.
- Can a homeowner pull a shed permit themselves in Seattle?
- Under Washington law (RCW 18.27.090(11), (12); RCW 19.28.261(1); RCW 18.106.150(1)): Washington lets homeowners do their own construction work, including the licensed trades, on property they own. RCW 18.27.090(12) exempts any person working on his or her own property from contractor registration, but the exemption does not apply if you do contractor type work for the purpose of selling, demolishing, or leasing the property, and the separate owner exemption in RCW 18.27.090(11) is lost if you sell or lease improved property owned less than 12 months. For electrical work, RCW 19.28.261 lets you wire your own residence, farm, or place of business without an electrician license, unless the work is on construction of a new building intended for rent, sale, or lease, or on property offered for sale within 12 months after you obtained it. RCW 18.106.150(1) gives the same kind of exemption for plumbing work at your own residence, farm, or place of business. These exemptions waive the license, not the permit: an owner doing electrical work still buys an L&I electrical work permit and passes inspection (WAC 296-46B-901), and building and plumbing permits still come from your local building department. Confirm how Seattle applies this before you apply.
From the Library
What else needs a permit in Seattle
Every other permit type we have verified for this jurisdiction, with the rule that applies here.
| Project | Permit needed? | Threshold | Typical fee |
|---|---|---|---|
| Deck Permit | It depends | decks more than 18 inches above grade require a permit; decks 18 inches or less above grade and not over a basement do not require a permit | Priced as a subject-to-field-inspection or addition/alteration construction permit by... |
| Electrical Permit | Permit required | Not specified | Itemized per Fee Subtitle Table D-15: minimum $105.12 for a standard online self-issued... |
| Fence Permit | It depends | fences under 8 feet with no masonry or concrete elements exceeding 6 feet do not require a permit | Fences 8 feet or less with no masonry or concrete elements over 6 feet need no permit... |
| HVAC Permit | Permit required | Not specified | Ducted HVAC systems are priced by project valuation with a $292 minimum |
| Patio Permit | No permit needed | Not specified | No standalone patio permit |
| Plumbing Permit | Permit required | Not specified | No SDCI fee |
| Pool Permit | Permit required | Not specified | An unenclosed pool accessory to a single-family or duplex home is a flat fee of four... |
| Roof Replacement Permit | No permit needed | Not specified | One and two family homes need no permit for a straight reroof that does not change the... |
| Solar Permit | Permit required | Not specified | Solar PV is permitted through the electrical permit: systems below 12kW are a flat $438... |
Shed Permit in other Washington localities
Everything above, sourced
Code references
National and state model-code sections the general guidance on this page is drawn from. They are not Seattle documents; the office above sets the local rules.
- IRC R105.3 (permit application), R106.2 (site plan), R403.1 (footings and anchorage for accessory structures), and R403.1.6 (sill anchorage), 2021 IRC
- IRC R109.1.1 (foundation inspection), R109.1.4 (frame inspection), R109.1.6 (final inspection), and R106.1.2 (manufacturer's instructions on site), 2021 IRC
How this shed permit page for Seattle was verified. 2 official sources: seattle.gov, seattle.gov; fee schedule: official document. Last checked by Mario Bailey, not confirmed with Seattle Department of Construction and Inspections. Rules change; confirm before you build. How we verify.
Last checked: Report an error on this page
Compare Shed Permit requirements across Washington localities
Washington rule changes