Do you need a deck permit in Washington?
By Mario Bailey Last checked
- Always required
- 0
- of 8 jurisdictions
- Conditional
- 8
- depends on size or scope
- Not required
- 0
- exempt outright
Deck Permit rules nationwide, beyond Washington.
Requirements and size thresholds for deck permits vary by locality. The table below compares what each Washington county or city requires. Always confirm with the local office before starting.
Comparing states? See deck permit rules across every locality we cover.
The application steps and inspection sequence for deck permits come from the model code rather than from Washington law, so they read the same wherever you build. We keep that walkthrough in one place: how a deck permit application and its inspections work, start to finish. What changes between Washington jurisdictions is below: who requires a permit, what they charge, and which office you file with.
Swipe sideways to see thresholds and confidence.
| Locality | Permit required? | Typical threshold | Confidence |
|---|---|---|---|
| Bellevue | Conditional | decks where the highest walking surface is 30 inches or less above grade do not require a permit; decks over 30 inches above grade require a permit with plan review | Confirmed on official page |
| Clark County | Conditional | Exempt only if the deck does not exceed 200 square feet, is not more than 30 inches above grade at any point, is not attached to a dwelling, does not serve a required exit door, and is not used for a hot tub or pool; all other decks require a permit. | Confirmed on official page |
| King County | Conditional | uncovered decks 30 inches or less above ground do not require a building permit in unincorporated King County; decks over 30 inches above grade require a permit | Confirmed on official page |
| Pierce County | Conditional | Decks not more than 30 inches above grade at any point, and not over any story or basement below, are exempt; Pierce County code sets no separate floor area cap for decks; taller decks, or decks over a story or basement, require a building permit. | Confirmed on official page |
| Seattle | Conditional | 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 | Confirmed on official page |
| Snohomish County | Conditional | uncovered decks, deck steps, and uncovered porches for residential buildings exempt if 30 inches or less above adjacent grade at any point, not over a basement or story below, and not part of a required accessible route; covered or taller decks require a permit | Confirmed on official page |
| Tacoma | Conditional | freestanding decks not exceeding 200 sq ft and not more than 30 inches above grade are exempt; decks over 200 sq ft, over 30 inches above grade, or attached to the dwelling require a permit | Confirmed on official page |
| Thurston County | Conditional | Decks are exempt if the surface is 30 inches or less from the ground to the top of the deck. | Confirmed on official page |
| No localities match your filter. | |||
What a deck permit costs in Washington
5 Washington jurisdictions we cover publish a fee figure for this work. Each line is quoted from that office's own schedule and linked to its citation. The figures are not comparable to one another: some are flat minimums, some a percentage of job value, some charged per fixture, so what you pay depends on which schedule applies and on your job's valuation.
Building permit fee by valuation per Table 4 of Ordinance 6879, $44 inspection fee minimum for valuation up to $500 plus plan review at 65% of the inspection fee plus a $25 state building code fee at issuance, effective 2026-01-01
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Most permit fees increased approximately 14% on January 1 2026 plus a $126 application screening fee
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Building permit fee follows PCC Table 17C.10-1-B (valuation based): $69.00 for construction valued at $500 or less, plus $2.00 for each additional $100 or fraction up to $2,000, plus a plan review fee equal to 65 percent of the building permit fee (PCC Table 17C.10-1-C).
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Priced as a subject-to-field-inspection or addition/alteration construction permit by project valuation per the 2026 Fee Subtitle (SMC 22.900), minimum value-based fee $292, minimum STFI plan review fee $116.75, plus a 5% technology fee
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Base application fee $150 per application plus 3% technology surcharge and $6.50 Washington State building permit surcharge; the permit fee itself scales with the county's valuation-based fee table (Carport/Covered Deck valued at $31.50 per sq ft)
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Jurisdictions not listed publish no dollar figure we could quote. Absence does not mean a permit is free.
Common questions about deck permits in Washington
- Do I need a deck permit in Washington?
- In Washington it depends on the size of the job. Permits are issued locally, so the answer comes from your Washington city or county rather than a single statewide rule. Of the 8 Washington jurisdictions we have verified for deck work, 0 require a permit outright, 8 depend on the size or scope of the job, and 0 require none.
- Is there a deck permit exemption in Washington?
- 8 of the 8 Washington jurisdictions we cover set a threshold rather than a flat rule, so the same job can be exempt in one Washington county and permitted in the next. The table above lists each Washington jurisdiction's published threshold in its own words, with the source and the date we verified it.
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