Seattle, Washington · Deck Building
Deck Builder in Lynnwood
Lynnwood follows the residential code's short list of exempt decks and asks for engineering reports on difficult ground, so the site itself can decide what the paperwork looks like. On an older house, the deck may predate the rules a replacement now has to meet.
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Typical price in Seattle: Composite deck, installed$40–$75 per sq ft of deckSource: 5 Seattle-area contractor price pages, price data from September 17, 2026
Good to know in Lynnwood
- Source: City of Lynnwood
Only a small, low, freestanding deck escapes a Lynnwood permit: the exemption covers decks not exceeding 200 square feet, not more than 30 inches above grade at any point, not attached to a dwelling and not serving the exit door. Miss any one of the four and you need the permit.
- Source: City of Lynnwood
Difficult ground adds an engineer to the budget. Lynnwood asks for a geotechnical report where construction will occur on soft compressible soils, where there are landslide or seismic hazards, or where the foundation needs unique or deep footings, and those reports must be stamped and signed by Washington State licensed engineers.
- Source: US Census Bureau, American Community Survey
The median Lynnwood home was built in 1979. If a deck that old is due for replacement, check whether the rules have changed since it went in; a new one attached to the house falls outside the exemption above. Cedar and pressure-treated wood and composite are compared on their own pages.
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