Deck Building · Washington
Deck Building in Washington
Custom new decks planned around your home, yard and how you'll use the space for homes in Washington, where the median home was built in 1984. Free referral to an independent contractor serving 118 covered ZIP codes.
Local guide
Deck Building in Washington: what to know
Quick answer
Deck Building in Washington is available through DeckBuildingServices.net, a free referral service that connects homeowners in 34 covered towns and 118 ZIP codes across Washington with independent deck contractors. In our covered Washington ZIP codes, the median home was built in 1984 and the area averages 25 freezing nights a year (NOAA).
Deck Building and local data in Washington
Footing depth is the first local question. The Seattle Sand Pt Wsfo weather station records about 25 nights a year at or below freezing for in our covered Washington ZIP codes, so footings must reach the frost depth the building department sets, and about 3.8 inches of yearly snowfall feeds into beam and joist sizing.
53% of the 1,504,023 homes in our covered Washington ZIP codes are detached houses and 5% are townhouses or other attached homes, which sets the mix between open backyard decks and compact elevated ones; with a median build year of 1984, most new decks bolt to a modern rim joist behind proper flashing.
About 2 days a year reach 90°F, so orientation, shade and board color are design decisions in our covered Washington ZIP codes, not afterthoughts.
| County | Covered towns | Covered ZIPs |
|---|---|---|
| King County | 17 | 70 |
| Pierce County | 9 | 31 |
| Snohomish County | 9 | 17 |
Who issues permits for deck building in Washington?
Washington adopts building codes statewide through the State Building Code Council, with cities and counties enforcing them and issuing permits. New decks, replacements and structural repairs usually need a permit; staining and like-for-like board swaps often do not.
Who licenses deck contractors in Washington?
Washington requires contractors to register with the Department of Labor & Industries, which includes carrying a surety bond and general liability insurance in the exact business name. Specialty contractors may only work in their registered specialty and cannot hire subcontractors.
When is the best time for deck building in Washington?
Average lows near Washington stay above freezing almost all year, so construction can run nearly year-round; the most comfortable months for staining and sealing wood are April–October.
The coldest month is February (average low 37°F) and the hottest is August (average high 77°F). November is typically the wettest month, with about 5.8 inches of precipitation — plan finish work around it. December brings the most snow on average (about 1.7 inches), so footings and framing are best finished well before then. Use the winter months to settle the design and apply for permits, so footings can go in as soon as the ground allows.
| Month | Avg high °F | Avg low °F | Precip (in) | Snow (in) |
|---|---|---|---|---|
| Jan | 47 | 37 | 5.1 | 0.9 |
| Feb | 50 | 37 | 3.5 | 1.0 |
| Mar | 54 | 39 | 3.9 | 0.0 |
| Apr | 59 | 43 | 3.0 | 0.0 |
| May | 65 | 48 | 2.2 | 0.0 |
| Jun | 70 | 53 | 1.6 | 0.0 |
| Jul | 77 | 57 | 0.8 | 0.0 |
| Aug | 77 | 57 | 1.0 | 0.0 |
| Sep | 71 | 53 | 1.7 | 0.0 |
| Oct | 61 | 47 | 3.6 | 0.0 |
| Nov | 52 | 41 | 5.8 | 0.2 |
| Dec | 47 | 37 | 5.5 | 1.7 |
Authoritative references
- Register as a contractor — Washington State Department of Labor & Industries
- Washington State Building Code Council — State of Washington
- Prescriptive Residential Wood Deck Construction Guide (DCA 6) — American Wood Council
How the work itself is done is covered in our deck building guide.
FAQs
Deck Building questions in Washington
Who provides deck building in Washington?
Independent deck contractors. DeckBuildingServices.net is a free referral service: you call, confirm your ZIP code and describe the project, and you are connected with a contractor serving Washington who gives their own site visit, written scope and price.
Do I need a permit for deck building in Washington?
Washington adopts building codes statewide through the State Building Code Council, with cities and counties enforcing them and issuing permits. New decks, replacements and structural repairs usually need a permit; staining and like-for-like board swaps often do not.
What affects the cost of deck building in Washington?
deck size and shape — angles and curves add labor, height above grade and the amount of post, beam and bracing work and decking material and fastening system. Locally, footing depth for about 25 freezing nights a year adds to foundation work. Prices come from the contractor after a site visit.
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Deck Building in Washington
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