Deck building cost in Seattle, WA: what 413 permits declare
The median declared cost of deck building on Seattle building permits filed 2024–2026 is $20,000. Half of all permits fall between $11,626 and $39,375. The national sourced whole-project range on our deck building cost guide is $9,000–$20,000.
Median declared cost
$20,000
413 permits
Middle half
$11,626–$39,375
p25–p75
Full span after trimming
$750–$100,000
$500 floor, top 1% removed
How to read this
These figures are the project values applicants declared to the Seattle permitting office, which uses them to calculate permit fees. Declared values tend to sit below the final invoice, and jobs done without a permit are not counted at all. Read the median as a floor for a permitted deck building job in Seattle, then check it against the sourced national range and get local quotes.
Where the data comes from
Source: Seattle open-data portal, dataset 76t5-zqzr. Filter: residential permits issued 2024-09-09 to 2026-09-09 whose description matchesupper(description) like '%DECK%' AND upper(description) not like '%ROOF DECK%' AND upper(description) not like '%POOL DECK%'. Compiled 2026-09-09. Full method on the methodology page; every cell is in the CSV download.