How Much Does a Building Permit Cost in Seattle? (2026 Guide)
If you're a contractor or builder working in Seattle, prepare for some of the highest permit fees on the West Coast. The Seattle Department of Construction and Inspections (SDCI) raised construction permit and Master Use Permit fees by 18% for 2026, with most other fees up 6.5%.
Seattle Building Permit Costs at a Glance
Seattle uses a valuation-based fee structure with an hourly rate of $292 for 2026. You'll pay approximately 75% of estimated fees upfront.
Residential permit costs:
- Small residential projects (bathroom remodel, deck): $500–$1,500
- 500 sq ft backyard cottage (DADU): approximately $3,400+ in permit and plan review fees
- New single-family home: $8,000–$20,000+ depending on size
Commercial permit costs:
- Small commercial tenant improvements: $3,000–$8,000
- 35-unit apartment building: approximately $48,741 total fees
- Large commercial construction ($1M+): $40,000–$100,000+
Where to Apply for a Building Permit in Seattle
- Online portal: Seattle Services Portal — start with a Building & Land Use Pre-Application
- SDCI main office: 700 5th Avenue, Suite 2000
- Phone: 206-684-8600
Special Requirements to Know About
The 18% fee increase is the headline. Construction permit and Master Use Permit fees jumped 18% year-over-year.
Seismic retrofit discount. Seattle offers a 50% fee reduction for projects contributing to seismic retrofit of unreinforced masonry (URM) buildings — new for 2026.
75% upfront payment. Unlike most cities, Seattle requires approximately 75% of estimated fees when you submit plans.