How Much Does a Building Permit Cost in Seattle?

Permit Cost by Project

Do You Need a Permit?

Seattle uses a valuation based system from Table D-1 on page 23. The rates are per hundred dollars of value. Not per thousand. That trips people up. The first thousand costs $325. Then it adds $1.60 for each additional hundred up to the next tier.

They charge the full DFI amount for the permit. Then they charge it again for plan review. You pay twice. An $8,000 job ends up at $924 after the 5 percent tech fee and $6.50 state surcharge. We ran the exact math from SMC Title 22 Subtitle IX. (I had to cross reference three sections to confirm the per hundred rate.)

Plumbing works separately. King County Public Health collects it under section 22.900G.030. Those fees start at $132 plus $26 per fixture. Electrical pulls from its own tables. A panel upgrade often hits $371. The calculator on this page handles all the combinations. It saves you the headache.

Nobody builds these numbers into bids. Expect to pay.

Seattle exempts work that costs $6,000 or less in any six month period. But you can't touch load bearing supports or the building envelope. The rules get specific fast.

Small sheds under 120 square feet on a slab avoid permits. Same for fences under 8 feet with no masonry. Decks usually need one. Window replacement might qualify if you stay under the dollar limit and match the existing setup.

Don't guess. The SDCI exempt work list spells it out. We pulled it directly from their site. Skip the permit on a gray area job and you risk the full investigation fee later. Better to check first.

Unpermitted work triggers a tiered special investigation fee. The city bases it on your project valuation through Table B-2. You find the details on page 12.

They don't just charge the normal rate. The reinspection fee alone runs $146 each time. That adds up quick. You still must bring the work up to code after the fact. The 2026 fee schedule makes this clear in section 22.900B.020.F.

If you sell the house the missing permits create problems. Lenders and buyers notice. Pull the permit up front. The extra cost of doing it right is lower than the penalty.

The 2026 fee subtitle doesn't list specific duration rules. We searched the full document, and Nothing turned up.

Contact the Seattle Department of Construction and Inspections directly for current validity periods. Ask about extensions too. Most cities set deadlines but Seattle may differ. Don't assume your permit lasts a full year. Check before you start.

Homeowners can pull permits for work on their own house. The rules allow it. Licensed contractors usually handle their own though.

If a contractor asks you to pull the permit yourself that's a red flag. They want you on the hook for code problems. We see this pattern across many cities. Make sure the bid lists who pulls each trade permit. Clear language protects you.

Plumbing permits run through King County Public Health. Not SDCI. They start at $132 plus $26 per fixture and skip the tech fee entirely. This setup feels different from most cities we studied.

Roof replacements on one and two family homes are exempt too. You submit an affidavit by email instead of pulling a permit. No inspection required. That saves real money. (I had to read the exempt list twice to believe it.)

The $6.50 state surcharge still hits residential building permits under RCW 19.27.085. These quirks change the final total in ways the average person doesn't expect. If your project involves plumbing or a new roof check the exact path first.

How much does a building permit cost in Seattle?

A fifteen thousand dollar bathroom remodel costs one thousand five hundred ninety dollars in total permits. That includes building plumbing and electrical. Use the calculator on this page for your exact project size.

Do I need a permit to replace a water heater in Seattle?

Yes you need a plumbing permit. It costs about one hundred sixty five dollars for a single unit. King County Public Health collects the fee.

How much is a plumbing permit in Seattle?

The base fee is one hundred thirty two dollars. Then add twenty six dollars per fixture. A typical bathroom with five fixtures runs two hundred sixty two dollars.

Do I need a permit to build a deck in Seattle?

Yes a deck usually requires a building permit. At twelve thousand dollars valuation it costs one thousand fifty nine dollars total. Check the height and foundation rules first.

Do I need a permit for electrical work in Seattle?

Most electrical work needs a permit. A two hundred amp panel upgrade costs three hundred seventy one dollars. Licensed electricians usually pull these in their name.

Do I need a permit in Seattle to replace a roof?

No for one and two family homes. Submit a roof replacement affidavit by email and you skip the permit entirely. Commercial and multifamily roofs still require permits and cost one hundred forty six dollars.