Cost to Build a House in Seattle, Washington
Construction costs in Seattle, Washington typically range from $275–$450 per square foot. Typical full builds run $550K–$1.6M+, with ADUs from $152K–$324K and permits $10K–$80K+. Average timeline: 4-10 months.
Cost Snapshot
- Cost per Square Foot: $275–$450
- Typical Full Build: $550K–$1.6M+
- ADU Construction: $152K–$324K
- Permit Costs: $10K–$80K+
- Typical Timeline: 4-10 months
Cost Impact Factors
- Zoning restrictions in Seattle
- Lot size, slope, and access
- Permit requirements in Seattle
- Energy and building codes
- Labor costs in Washington
Frequently Asked Questions
- How much does it cost to build a house in Seattle?
- In 2026, residential construction in Seattle costs $275–$450+ per square foot depending on finish tier, lot conditions, and project scope.
- How long does it take to build a house in Seattle?
- A typical new-construction home in Seattle takes 8–14 months from permit approval to completion. Permit processing adds 4-10 months.
- How much does an ADU cost in Seattle?
- ADU construction in Seattle typically costs $152K–$324K depending on size, finish level, and whether it's attached or detached.
- What permits do I need to build in Seattle?
- You'll need building permits, plan check approval, and potentially grading, electrical, plumbing, and mechanical permits. Costs range from $10K to $80K+.
- Is Buildora IQ accurate for Seattle estimates?
- Yes. Buildora IQ calibrates every estimate to Seattle's current labor rates, material costs, and permit fee structures using local market data.
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