Basement finish permits in City of Renton: fees, timeline & requirements (2026)
Everything you need to know about pulling a basement finish permit in City of Renton, Washington — when one is required, what it costs, how long review takes, what documents are required, and which inspections you can expect. Cited to Renton uses TRAKiT permits portal..
Free lookup, no account needed — your lot polygon, zoning, setbacks and overlays, cited to City of Renton's source.
When does a basement finish need a permit in City of Renton?
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 City of Renton adopted this rule
The threshold comes from the state code (WAC 51.51), which City of Renton adopts by reference in the provision quoted below.
“4-5-055 INTERNATIONAL RESIDENTIAL CODE ADOPTED: The 2021 Edition of the International Residential Code (IRC), as adopted and amended by the State Building Code Council in chapter 51-51 WAC, as published by the International Code Council, is adopted by reference, with the City’s amendments thereto, as specified in subsections A and B of this Section. Chapter 1, Scope and Administration, is not adopted and the Construction Administrative Code, as set forth in RMC 4-5-060 , shall be used in place of IRC Chapter 1, Scope and Administration;”Source ↗verified 2026-09-24
Required submittals
- Application Form, Building Division (RMC 4-8-120B col "Single Family/Multi-Family Interior Remodel")
- Architectural Plans, Detached and 2 Attached Dwellings — when applicable
- Floor plan showing existing + proposed work (RMC 4-8-120B implied)
- Energy Code Checklist, Residential — required when newly conditioned space (basement finish, garage conversion) or envelope changes
- Structural Plans + Calcs — when structural changes (header, beam, lateral) are proposed
Inspection sequence
- rough-in (electrical/plumbing/mechanical)
- framing
- insulation
- drywall
- final
Contractor specialties needed
general, electrical-01-or-02, plumbing, mechanical
Who can do this work in City of Renton?
Kolmo Construction is a licensed Washington general contractor — KOLMOL*753JS, active through April 10, 2027, bonded and insured — working throughout City of Renton and King County. Kolmo prepares the drawings and submittals, files the basement finish permit with Renton uses TRAKiT permits portal., carries the project through review and inspections, and performs the construction. Call (206) 410-5100 for a City of Renton basement finish quote.
Notes & caveats
Basement finish — Interior Remodel submittals per RMC 4-8-120B. Newly conditioned area triggers WSEC R-prescriptive checklist + egress windows (IRC R310) per Renton building handout.
Basement finish permit fee — Washington baseline, not City of Renton's own schedule
Worked example for a $40,000 basement finish project (building permit). Your actual fee scales with project valuation.
| Building permit fee | $542.75 |
| Plan review | $352.79 |
| WA state surcharge | $6.5 |
| Estimated total | $902.04 |
Plan-review fee scales with valuation. State surcharge $6.50. Apply via https://permits.rentonwa.gov. We have not read City of Renton's adopted fee schedule, so this is not City of Renton's fee: it walks the standard valuation table most Washington cities adopt by reference, as a rough guide. The real numbers are in City of Renton's fee schedule ↗. Impact/utility fees may apply separately.
How to apply yourself
- 1. Confirm your parcel's zoning & overlays. Run an address lookup for your City of Renton basement finish — we'll pull your specific lot polygon, zoning, setbacks, and any shoreline/ECA/historic overlays.
- 2. Assemble submittals (5).
- 3. Submit through the city portal: Renton uses TRAKiT permits portal. ↗
- 4. Track review. Respond to reviewer comments promptly.
- 5. Pay issuance fees (Plan-review fee scales with valuation. State surcharge $6.50. Apply via https://permits.rentonwa.gov.) and pick up the permit. Inspection card travels with the job.
Or have Kolmo do it
We pull basement finish permits in City of Renton every month. We prepare the drawings and submittals, file with Renton uses TRAKiT permits portal., handle reviewer comments, and build the project.
Licensed WA general contractor KOLMOL*753JS · bonded & insured
Basement finish permits in City of Renton — FAQ
When does a basement finish need a permit in City of Renton?
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 City of Renton?
For a $40,000 basement finish project, the estimated City of Renton permit fee is about $902.04 — building fee $542.75 + plan review $352.79 + surcharges. Fees scale with project valuation per the city schedule.