Basement finish permits in Tacoma: fees, timeline & requirements (2026)
Everything you need to know about pulling a basement finish permit in Tacoma, Washington — when one is required, what it costs, how long review takes, what documents are required, and which inspections you can expect. Cited to Tacoma Planning & Development Services.
Free lookup, no account needed — the office that issues the permit at your address, and a layout of the room, cited to Tacoma's source.
When does a basement finish need a permit in Tacoma?
2021 IRC R310: every sleeping room below grade requires emergency escape and rescue opening (egress window). Min sill height 44in, min net clear opening 5.7 sq ft (5.0 grade-floor), min width 20in, height 24in. Ceiling height min 7ft (R305). Entire newly conditioned area must comply with WSEC R402.
How Tacoma adopted this rule
The threshold comes from the state code (WAC 51.51), which Tacoma adopts by reference in the provision quoted below.
“The International Building Code, International Residential Code, and International Existing Building Code, as adopted and amended by the Washington State Building Code Council under the State Building Code, as defined in TMC § 2.02.100, are hereby adopted as the official Building Code of the City of Tacoma. The Tacoma Building Code as defined in TMC § 2.02.100 is also amended to include the adoption of IBC Appendix Chapter G, the adoption of IEBC Appendix A, and a new Appendix J added to the IEBC.”Source ↗verified 2026-04-29
What Tacoma says in its own permit handout
From Converting a Basement to Living Space, published by Tacoma. This is the jurisdiction's own guidance on its permit process, not the ordinance text — where the two differ, the code governs.
“Emergency Escape – The basement must have at least one emergency egress window or a door directly to the exterior. If you are creating a bedroom, the egress window or door must be within the bedroom itself. Egress windows shall provide 5.7 square feet of openable area, with a minimum openable width of 20" and a minimum openable height to 24". The sill height may be a maximum of 44" above the finished floor.”Handout ↗read 2026-09-05
Required submittals
- Floor plan w/ egress windows + ceiling heights
- Electrical layout
- Plumbing diagram
- Mechanical / HVAC plan
- WSEC compliance form (newly conditioned space)
- Smoke/CO alarm locations
Inspection sequence
- Rough-in (electrical/plumbing/mechanical)
- Framing
- Insulation
- Drywall
- Final
Contractor specialties needed
General contractor · Electrician (journey-level 01 or residential 02) · Plumber
Who can do this work in Tacoma?
Kolmo Construction is a licensed Washington general contractor — KOLMOL*753JS, active through April 10, 2027, bonded and insured — working throughout Tacoma and Pierce County. Kolmo prepares the drawings and submittals, files the basement finish permit with Tacoma Planning & Development Services, carries the project through review and inspections, and performs the construction. Call (206) 410-5100 for a Tacoma basement finish quote.
Notes & caveats
Tacoma's residential alteration permit (BLDRA) covers "remodels, additions, alterations of less than 80% building valuation." Basement conversion to habitable space falls under BLDRA — includes building, plumbing, mechanical, and site development as needed.
Basement finish permit fee estimate in Tacoma
Worked example for a $40,000 basement finish project (building permit). Your actual fee scales with project valuation.
| Combination permit fee, remodel (2.81% of valuation) | $1,124 |
| Plan review | $505.80 |
| Technology Program (5%) | $81.49 |
| Natural Resources Program (5%) | $81.49 |
| Reserve Fund (2%) | $32.60 |
| Emergency Preparedness (5% of permit fees) | $56.20 |
| WA state surcharge | $6.50 |
| Estimated total | $1,888.08 |
Tacoma prices a basement finish in a house or duplex as one combination building, mechanical and plumbing permit (PDS Fee Schedule Table 8-4): 2.81% of the value of the work, $180 at the least, with plan review at 45% of that fee. Table 1 adds the technology (5%), emergency preparedness (5%) and reserve fund (2%) surcharges, and the natural resources program (5%) on building permits. The electrical permit is Tacoma Power's, $89 for 1 to 4 new or altered circuits where the service is not changed (TMC 12.06A.250). Computed from Tacoma's adopted fee schedule · source ↗. Land use, fire and engineering review, intake, impact and utility fees, where they apply, are charged separately.
How to apply yourself
- 1. Check who issues the permit. Run an address lookup for your basement finish in Tacoma — we'll confirm which office issues the permit at that address, and you can lay out the room.
- 2. Assemble submittals: the 6 documents under Required submittals above.
- 3. Submit through the city portal: Tacoma Planning & Development Services ↗
- 4. Track review (typical: 14–30 days). Respond to reviewer comments promptly.
- 5. Pay issuance fees (about $1,888 for a $40,000 project) and pick up the permit. Inspection card travels with the job.
Or have Kolmo do it
Kolmo prepares the drawings and submittals, files with Tacoma Planning & Development Services, handles reviewer comments, and builds the project.
Licensed WA general contractor KOLMOL*753JS · bonded & insured
Basement finish permits in Tacoma — FAQ
When does a basement finish need a permit in Tacoma?
2021 IRC R310: every sleeping room below grade requires emergency escape and rescue opening (egress window). Min sill height 44in, min net clear opening 5.7 sq ft (5.0 grade-floor), min width 20in, height 24in. Ceiling height min 7ft (R305). Entire newly conditioned area must comply with WSEC R402.
How much does a basement finish permit cost in Tacoma?
For a $40,000 basement finish project, the estimated Tacoma permit fee is about $1,888.08 (building fee $1,124 + plan review $505.80 + surcharges) from Tacoma's adopted fee schedule. Land use, fire and engineering review, intake, impact and utility fees, where they apply, are charged separately.
How long does Tacoma take to review a basement finish permit?
Typical review window: 14–30 days.