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Seattle, WA Construction Costs 2026

Seattle's construction market reflects its position as the Pacific Northwest's largest metro. Strong demand from Amazon, Boeing, and tech sector growth keeps labor costs 15–25% above national averages, while a temperate but wet climate shapes roofing and deck material choices. King County permitting adds 4–8 weeks to most projects.

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All Seattle Cost Guides

Detailed cost breakdowns for the most common residential construction projects in Seattle, Washington. Data sourced from RSMeans 2026 benchmarks and local contractor rates.

🍳
Kitchen Remodel
$16,000 – $110,000
Avg: $48,000
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🚿
Bathroom Remodel
$7,000 – $50,000
Avg: $19,000
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🏠
Home Addition
$55,000 – $420,000
Avg: $165,000
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🏗️
Roof Replacement
$8,500 – $34,000
Avg: $16,000
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Deck Building
$6,500 – $48,000
Avg: $20,000
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Frequently Asked Questions

Why are construction costs higher in Seattle than the national average?
Seattle labor costs run 15–25% above national averages due to tight trade supply, strong union presence, and competition from large commercial and tech campus projects. Material costs also reflect Pacific Northwest freight premiums.
How long does permitting take in Seattle/King County?
King County building permits typically take 4–8 weeks for residential projects. Complex additions or work in shoreline setback zones can take 3–6 months. Factor this into your project timeline and budget.
What's the best time of year to schedule exterior work in Seattle?
May through September offer the driest window for exterior projects like roofing and decks. Scheduling during this period often means premium pricing but fewer weather-related delays and callbacks.
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