Addition permits in City of Renton: fees, timeline & requirements (2026)
Everything you need to know about pulling a home addition 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 home addition need a permit in City of Renton?
Additions always require a building permit — they are expressly excluded from "ordinary repairs" (RMC 4-5-060 §105.2.2). Work started without a permit is subject to a special investigation fee equal to twice the permit fee.
In the source's own words
“nor shall ordinary repairs include an addition to, alteration of...”Source ↗verified 2026-09-24
Required submittals
- Application Form, Building Division (RMC 4-8-120B row "Application Form, Building Division" col "Single Family/Duplex New or Additions")
- Architectural Plans, Detached and 2 Attached Dwellings (RMC 4-8-120B)
- Architectural Elevations (RMC 4-8-120B footnote q: required for SF when changing elevation)
- Biological Assessment / Critical Areas Study — required only when site is in a critical area (RMC 4-8-120B footnote s)
- Drainage Plans (RMC 4-8-120B footnote h: required if project meets Surface Water Design Manual thresholds)
- Structural Plans (RMC 4-8-120B)
- Structural Calculations (RMC 4-8-120B)
- Energy Code Checklist, Residential (per WSEC 2021 R-prescriptive checklist + Renton amendments)
- Geotechnical Report (RMC 4-8-120B — required for projects on sloped or expansive soils)
- Site Plan (RMC 4-8-120B — north arrow, property lines, setbacks, existing + proposed structures)
- Tree Retention/Land Clearing Plan (RMC 4-4-130 — required when site contains significant trees ≥6" DBH outside building footprint)
- Wetlands Report (RMC 4-8-120B footnote a — required when wetlands present)
Inspection sequence
- foundation/footing
- plumbing rough-in
- electrical rough-in
- mechanical rough-in
- 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 home addition 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 home addition quote.
Notes & caveats
Submittals encoded from RMC 4-8-120B (Building Section Permit Submittal Requirements), Table column "Single Family/Duplex New or Additions". Plan-set must include the items below; site plan must meet Renton standards (north arrow, property lines, setbacks per the underlying R-X zone in RMC 4-2-110, lot coverage calc). Site Plan Review (RMC 4-9-200) is REQUIRED for non-detached SF projects in IL, CO, CN, CD, CA, CV, COR, UC-1, UC-2, R-10, RMH, RM, R-14 zones; detached SF in R-zones is generally exempt from Site Plan Review. Apply via permits.rentonwa.gov.
Addition permit fee — Washington baseline, not City of Renton's own schedule
Worked example for a $120,000 home addition project (building permit). Your actual fee scales with project valuation.
| Building permit fee | $1,105.75 |
| Plan review | $718.74 |
| WA state surcharge | $6.5 |
| Estimated total | $1,830.99 |
Plan-review fee scales with valuation per UBC Table 1-A. State surcharge $6.50 per building permit. Trade permits (E/P/M) separate. 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 home addition — we'll pull your specific lot polygon, zoning, setbacks, and any shoreline/ECA/historic overlays.
- 2. Assemble submittals (12).
- 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 per UBC Table 1-A. State surcharge $6.50 per building permit. Trade permits (E/P/M) separate. Apply via https://permits.rentonwa.gov.) and pick up the permit. Inspection card travels with the job.
Or have Kolmo do it
We pull home addition 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
Addition permits in City of Renton — FAQ
When does a home addition need a permit in City of Renton?
Additions always require a building permit — they are expressly excluded from "ordinary repairs" (RMC 4-5-060 §105.2.2). Work started without a permit is subject to a special investigation fee equal to twice the permit fee.
How much does a home addition permit cost in City of Renton?
For a $120,000 home addition project, the estimated City of Renton permit fee is about $1,830.99 — building fee $1,105.75 + plan review $718.74 + surcharges. Fees scale with project valuation per the city schedule.