Washington State Permit Cost Calculator

Estimate what your building permit will cost anywhere in Washington State. Enter your zip code and project type to get a fee range calibrated to your county.

These are planning ranges, not a city invoice. We read each county's own published fee schedule directly wherever one exists. Where a county doesn't publish one, we estimate from comparable nearby counties instead of guessing, and every result clearly says which one you're looking at. The exact fee is always set by the issuing department.

✓ Official county fee schedules used wherever one is published
✓ Every result is clearly marked as "verified fee schedule" or "estimate only"
✓ Final fees should always be confirmed with the issuing department

Does your project require a permit? Book a free call and let us handle it from drawings to approval.

How Permit Fees Are Calculated

Permit fees vary by city, but Washington jurisdictions generally rely on one or more of these methods:

Flat fee
A fixed amount based on project type. Common for smaller scope work like fences and water heater swaps.
Valuation-based formula
Most Washington jurisdictions charge a base fee plus a rate per $1,000 of project valuation, scaling in tiers.
Trade permits
Electrical, plumbing, and mechanical work are often permitted separately from the building permit, each with its own fee.
Plan review surcharge
Projects requiring plan review, like additions or structural changes, typically add 50-65% on top of the base permit fee.

Our estimates are based on published Washington State fee schedules. Actual fees may vary by jurisdiction. Check your city's adopted fee schedule for exact pricing.

Typical Permit Fee Ranges by Project

Calculated from real 2026 fee formulas in Washington State, applied at typical project valuations for each category.

Deck
$140 – $1,510
Fence
$105 – $785
Roof Replacement
$140 – $1,050
Adding Bathroom
$280 – $1,255
Interior Remodel
$370 – $1,650
Room Addition
$625 – $5,450+
DADU
$1,400 – $6,250+
Pool
$140 – $2,140

These are permit fees only and don't include construction costs, contractor fees, or inspection fees. Ranges are calculated from real published 2026 valuation-based fee formulas in Washington State, applied at typical project values for each category, then extended statewide using regional cost patterns.

Frequently Asked Questions

Are these estimates guaranteed? +
What's included in the permit fee? +
Why do permit fees vary so much between cities? +
Do I need a permit for my project? +

Have questions about your specific project? We're happy to help.