All Cities / Washington / Seattle
How Much Does a Building Permit Cost in Seattle?
✓ Fee schedule checked against city sources
Fee math from Seattle Department of Construction and Inspections (SDCI), not a national average
Data last verified: March 23, 2026
Seattle has separate building, plumbing, electrical, and mechanical permits. Each has its own fee table in SMC Subtitle IX. Plumbing fees are collected by King County Public Health.
Permit Cost by Project
Kitchen Remodel$2,130.40
Bathroom Remodel$1,590.03
Building Permit ($25K project)$1,495.40
Swimming Pool Residential$1,168.00
Deck / Patio$1,058.60
Building Permit ($12K project)$1,058.60
Siding Replacement$991.40
Window Replacement$924.20
Building Permit ($8K project)$924.20
Solar Pv 12 To 26kw$876.00
Fence Permit$823.40
Demolition$466.40
Solar Panel Installation$466.40
Solar Pv Under 12kw$438.00
Demolition$438.00
Electrical Panel$371.35
Electrical Permit$371.35
Water Heater$164.50
Plumbing Permit$164.50
Commercial Reroofing$146.00
Reinspection$146.00
EV Charger Installation$92.35
HVAC Replacement$69.87
HVAC / Mechanical Permit$69.87
Do You Need a Permit?
No — Paint, cosmetic updates, fixture swaps
Yes — Bathroom remodel ($1,590.03)
Yes — Kitchen remodel ($2,130.40)
Yes — HVAC replacement ($69.87)
Yes — Water heater ($164.50)
Yes — Deck / patio ($1,058.60)
Yes — Window replacement ($924.20)
Yes — Electrical panel ($371.35)
Yes — Solar panels ($466.40)
Verified Permit Cost by Project Type
Kitchen Remodel
$2,130.40
Building, Electrical, Plumbing
Bathroom Remodel
$1,590.03
Building, Electrical, Plumbing, Mechanical
Building Permit ($25K project)
$1,495.40
Building
Swimming Pool Residential
$1,168.00
Flat Fee
Deck / Patio
$1,058.60
Building
Building Permit ($12K project)
$1,058.60
Building
Siding Replacement
$991.40
Building
Window Replacement
$924.20
Building
Two Types of Permits
Building Permit
Structural & Major Work
Covers structural changes, additions, remodels, and major renovations. Required when you're changing the layout, load-bearing walls, or footprint of your home.
Usually pulled by: General contractor or homeowner
Trade Permit
Specialty Systems
Covers plumbing, electrical, HVAC/mechanical, and roofing. Required when you're touching water lines, wiring, ductwork, or roof structure. Most remodels need trade permits on top of the building permit.
Usually pulled by: Licensed trade contractor (plumber, electrician, HVAC tech)
Work that typically requires a permit:
• New construction (residential or commercial)
• Additions: garage, deck, porch, ADU, carport
• Expanding or demolishing an existing structure
• Swimming pool installation
• HVAC installation or replacement
• Adding, moving, or removing walls
• Roof installation or replacement
• Finishing a basement
• Solar panel installation
• EV charging station installation
• Generator installation
• Fence installation
• Siding installation
• Window installation or replacement
Work that usually doesn't need a permit:
• Painting interior or exterior walls
• Installing cabinets without changing the layout
• Replacing carpet or flooring
• Replacing fixtures in the same location
• Cosmetic updates (countertops, backsplash, trim)
• Landscaping and yard work
Rules vary by city. When in doubt, call your local building department before starting work.
Seattle Permit Cost Calculator
Choose a common project or enter a project value to estimate local permit fees from Seattle Department of Construction and Inspections (SDCI) data.
✓ Updated from local fee schedule
✓ No account needed
Source confidence
Published local schedule
Permit scope
Building permit
Method
Formula-backed estimate
Estimate summary
Seattle calculator ready. Select a project to update the local permit estimate.
Estimated permit fee
$0.00
Updates instantly when project type or valuation changes.
✓ Verified local fee schedule
✓ Asphalt Shingle Roof Replacement
Local sourceBuilt from Seattle Department of Construction and Inspections (SDCI) fee data, not a national average.
Formula-backedValuation-based projects recalculate from the local fee formula.
Bookmark friendlyThe tool lives on this city page so citations and saved links stay stable.
Seattle charges $1,059 in building permit fees for a typical $12,000 bathroom remodel. Add the separate trade permits and you're looking at $1,664 all in. That's not cheap. The city uses its own fee tables in SMC Subtitle IX and layers on a state surcharge plus a 5% technology fee. No exceptions. We pulled the numbers straight from the 2026 Fee Subtitle PDF so you don't have to dig through it.
Seattle Permit Fee Structure Explained
Seattle doesn't use one single permit. You pull separate building, electrical, plumbing and mechanical permits for most jobs. Each has its own table. A $15,000 bathroom hits $1,059 for the building permit. Electrical runs $371 base. Plumbing sits at $165. Mechanical comes in at $70. That brings the total to $1,664. We cross referenced three PDFs to confirm it.
The building permit scales with project cost. $8,000 gets you $924. $25,000 pushes it to $1,495. Not linear. The calculator on this page uses the exact SMC formulas so the number you see matches what SDCI will charge.
King County Public Health really collects the plumbing fees. That's a quirk. Add the $6.50 WA State Building Code Council surcharge and the 5% technology fee on top of everything. (The technology fee hits every chapter from 22.900B through 22.900H.) Those extras aren't huge but they add up.
Most mid-size cities bundle this stuff. Seattle doesn't. Expect four separate invoices or line items. If your contractor's bid says one number for permits you should ask questions. The real number is almost never one check.
Chuck’s Take
“I tell every customer in my bids to add five percent for permits in a place like Seattle. Their separate trade permits add up fast. A $15,000 bathroom at $1,664 isn't pocket change. If the bid doesn't show a line item for permits I assume the guy is lowballing.”
Leonard “Chuck” Thompson, LC Thompson Construction Co.
What Needs a Permit in Seattle?
Seattle gives you a clear exempt work list. Jobs under $6,000 in any six month period usually skip the permit. But not if you touch load bearing walls, the building envelope, egress or fire ratings.
You don't need a permit for a shed under 120 square feet on a slab. Same for fences under 8 feet with no masonry over 6 feet. Retaining walls four feet or less clear too. Painting, cabinet installs and basic insulation don't trigger anything.
But a deck almost always needs one. Same for roof replacement, window swaps that change the envelope, basement finishing and pretty much any electrical or plumbing work. Do I need a permit in Seattle to replace a water heater? Yes. Do I need a permit in Seattle for a fence over 8 feet? Also yes.
The SDCI Exempt Work List spells it out. We suggest you check it before you start. Skipping the rules gets expensive quick.
Penalties for Unpermitted Work in Seattle
Seattle hits unpermitted work with a tiered special investigation fee. The exact amount depends on your project valuation. Table B-2 in the fee schedule lays it out.
They can also charge you a $146 reinspection fee on top. The city doesn't play around with this. You won't get away with it during a future sale either. Title companies flag this stuff now.
The rules come straight from page 12 of the 2026 fee tables under section 22.900B.020.F. Nobody wants to pay double or triple later. Pull the permit up front.
How Long Is a Building Permit Good For in Seattle?
Seattle building permits don't last forever. Most expire after a set period if work stops. You have to keep inspections moving.
Check your specific permit for the exact validity dates. SDCI can revoke permits too if you aren't following the approved plans. Renewal isn't automatic.
Start early. The review process takes time in this city. If you let it lapse you'll pay new fees to restart.
Who Should Pull the Permit in Seattle?
Contractors usually pull the permit in their own name in Seattle. That keeps the liability on them. They carry the insurance and bonding.
Homeowners can pull owner-builder permits for work on their own house. You sign paperwork saying you'll supervise it yourself. But electrical, plumbing and mechanical work often still needs licensed trades.
Watch out for contractors who want you to pull the permit. That's a red flag. It usually means they don't want their name on the paperwork if something goes wrong. We recommend the contractor pulls it. Every time.
Chuck’s Take
“Never let a contractor talk you into pulling the permit yourself. I won't work that way. My license and insurance are on the line. If they push back on this in Seattle it's time to find someone else.”
Leonard “Chuck” Thompson, LC Thompson Construction Co.
Seattle's Separate Trade Permits and State Surcharges
What really sets Seattle apart is the completely separate permit system for each trade. You don't get one building permit that covers everything. Plumbing comes through King County Public Health. Electrical has its own base fee of $371. Mechanical starts at $70.
On top of the SMC Subtitle IX fees you pay the WA State Building Code Council surcharge under RCW 19.27.085. That's $6.50 for home permits. The city also adds a 5% technology fee across six separate chapters of the code. (We had to cross reference the exact pages to make sure we weren't missing any.)
This adds friction. It also adds cost. A $25,000 kitchen hits about $2,130 in total permits. The structure makes no distinction for simple jobs versus complex ones in the same trade. If you're used to other cities this feels bureaucratic. But the fees are published clearly once you find the right PDF. Most people don't.
Quick Reference · Seattle Permit Requirements
| Homeowner Task | Permit? | Est. Cost |
|---|---|---|
| Paint interior / exterior | NO | Cosmetic |
| Replace flooring | NO | Cosmetic |
| Replace kitchen cabinets (same layout) | NO | Cosmetic |
| Swap a light fixture (same location) | NO | Cosmetic |
| Replace a water heater | YES | $164.50 Plumbing |
| Add / move electrical outlets | YES | $371.35 Electrical |
| Remodel a bathroom | YES | $1,590.03 Building, Electrical, Plumbing, Mechanical |
| Remodel a kitchen | YES | $2,130.40 Building, Electrical, Plumbing |
| Replace / repair roof | NO | Building |
| Build a deck or patio | YES | $1,058.60 Building |
| Build a fence (≤6 ft) | YES | $823.40 Building |
| Install solar panels | YES | $466.40 Building, Electrical |
| Replace HVAC system | YES | $69.87 Mechanical |
| Replace windows (new opening) | YES | $924.20 Building |
∗ Costs are verified for Seattle, WA from published fee schedule. Always confirm with your local building department.
Internal Comparison · separate trade permits
Compare Seattle Permit Fees With Related Cities
Use these source-linked city pages to compare Seattle against other Washington markets and cities with similar permit fee structures.
Portland, ORAlso uses separate trade permitsBathroom remodel permit package: $1,453.58 · -$136.45 vs Seattle
Minneapolis, MNAlso uses separate trade permitsBathroom remodel permit package: $959.10 · -$630.93 vs Seattle
Austin, TXAlso uses separate trade permitsBathroom remodel permit package: $686.86 · -$903.17 vs Seattle
Dallas, TXCross-market benchmarkBathroom remodel permit package: $994.00 · -$596.03 vs Seattle
Chicago, ILCross-market benchmarkBathroom remodel permit package: $902.00 · -$688.03 vs Seattle
Phoenix, AZCross-market benchmarkBathroom remodel permit package: $706.00 · -$884.03 vs Seattle
Richmond, VACross-market benchmarkBathroom remodel permit package: $144.75 · -$1,445.28 vs Seattle
Kansas City, MOCross-market benchmarkBathroom remodel permit package: $114.29 · -$1,475.74 vs Seattle
Frequently Asked · Seattle
How much does a building permit cost in Seattle?
A $15,000 bathroom remodel runs about $1,590 in total permits. That includes the $1,059 building permit plus separate electrical, plumbing and mechanical fees. Use the calculator on this page. It pulls the exact 2026 SMC Subtitle IX rates.
Do I need a permit to replace a water heater in Seattle?
Yes you do. A water heater replacement needs a plumbing permit. It costs $165 in Seattle. King County Public Health handles collection. Don't skip this one. The city will catch it later.
How much is a plumbing permit in Seattle?
Base plumbing permit runs $165 for most jobs. A full bathroom remodel at $15,000 still uses this base fee. Add it to the building and electrical permits. The total climbs quickly.
Do I need a permit to build a deck in Seattle?
Yes. A deck requires a building permit. For a customary $12,000 project that permit runs $1,059. Check the exempt work list first. Most decks won't qualify.
Why does Seattle charge separate permits for electrical, plumbing and mechanical work?
Seattle uses a separate trade permit system under SMC Subtitle IX instead of one bundled fee. Plumbing goes through King County. You pay $371 base for electrical, $165 for plumbing and $70 for mechanical on top of the building permit. The 5% technology fee applies to all of them.
Cite This Data
David Olson. (2026). Building permit fees in Seattle, WA. PermitCalculator. https://permitcalculator.com/cities/seattle-wa/
APA format
David Olson. “Building Permit Fees in Seattle, WA.” PermitCalculator. Accessed May 14, 2026. https://permitcalculator.com/cities/seattle-wa/
Chicago format
Data Attribution