How much does deck addition cost in Seattle?
Seattle, WA · King County · 23 ZIP codes · Data updated May 2026
A deck addition in Seattle typically costs $13,026 - $30,386, with most homeowners paying around $24,868. Seattle runs about 41% above the Washington median, and quotes can vary up to 72% between its cheapest and most expensive ZIP codes, so the neighborhood matters as much as the contractor.
It's a strong investment here: homeowners in this region recoup roughly 100% of the cost at resale, about $25,490 on a typical Seattle job.
October is normal-demand season for deck addition in this climate. Contractors in King County are booking about 3.5 weeks out.
Seattle Cost Range
$13,026 - $30,386
Typical: $24,868
Strong ROI
Equity Gain
$25,490
Added at resale
on a typical Seattle job
Normal season · ~3.5 wk contractor lead time
Deck Addition Cost by ZIP Code in Seattle
Each ZIP gets its own estimate from local home values and labor rates. Open yours for the full breakdown, seasonality, and ROI detail.
| ZIP | Estimated range | vs. city average | Details |
|---|---|---|---|
| 98134 | $13,026 - $17,624 | -38% | Full estimate → |
| 98104 | $16,320 - $22,080 | -23% | Full estimate → |
| 98121 | $16,919 - $22,891 | -20% | Full estimate → |
| 98101 | $17,668 - $23,904 | -16% | Full estimate → |
| 98106 | $20,063 - $27,145 | -5% | Full estimate → |
| 98108 | $20,962 - $28,360 | -1% | Full estimate → |
| 98102 | $22,010 - $29,778 | +4% | Full estimate → |
| 98118 | $22,309 - $30,183 | +6% | Full estimate → |
| 98103 | $22,459 - $30,386 | +6% | Full estimate → |
| 98105 | $22,459 - $30,386 | +6% | Full estimate → |
| 98107 | $22,459 - $30,386 | +6% | Full estimate → |
| 98109 | $22,459 - $30,386 | +6% | Full estimate → |
| 98112 | $22,459 - $30,386 | +6% | Full estimate → |
| 98115 | $22,459 - $30,386 | +6% | Full estimate → |
| 98116 | $22,459 - $30,386 | +6% | Full estimate → |
| 98117 | $22,459 - $30,386 | +6% | Full estimate → |
| 98119 | $22,459 - $30,386 | +6% | Full estimate → |
| 98122 | $22,459 - $30,386 | +6% | Full estimate → |
| 98125 | $22,459 - $30,386 | +6% | Full estimate → |
| 98126 | $22,459 - $30,386 | +6% | Full estimate → |
| 98136 | $22,459 - $30,386 | +6% | Full estimate → |
| 98144 | $22,459 - $30,386 | +6% | Full estimate → |
| 98199 | $22,459 - $30,386 | +6% | Full estimate → |
Frequently Asked Questions
How much does a deck addition cost in Seattle?
Based on 2026 data, a deck addition in Seattle, WA costs $13,026 - $30,386, with a typical price around $24,868. The range covers Seattle's 23 ZIP codes and the ±15% variance between contractor bids.
Is a deck addition worth it in Seattle?
Homeowners in this region typically recoup about 100% of the cost at resale, roughly $25,490 on a $24,868 project. That makes it one of the stronger-returning projects you can do here.
Why do deck addition quotes vary across Seattle?
Local home values and labor rates differ by ZIP code. In Seattle, the same project can cost up to 72% more in the most expensive ZIP than in the least expensive one. Check your exact ZIP below for a precise range.
Other Project Costs in Seattle
Sources: Remodeling Magazine Cost vs. Value, Zillow ZHVI, BLS construction wages, US Census. Methodology