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..
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.
From City of Renton's own page
“nor shall ordinary repairs include an addition to, alteration of...”Source ↗verified 2026-05-29
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
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 estimate in City of Renton
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 | $4.5 |
| Estimated total | $1,828.99 |
Plan-review fee scales with valuation per UBC Table 1-A. State surcharge $4.50 per building permit. Trade permits (E/P/M) separate. Apply via https://permits.rentonwa.gov. Computed from the City of Renton fee bracket schedule · source ↗. Impact/utility fees may apply separately.
How to apply
- 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 (typical: 30–120 days). Respond to reviewer comments promptly.
- 5. Pay issuance fees (Plan-review fee scales with valuation per UBC Table 1-A. State surcharge $4.50 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.
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 $1,828.99 — building fee $1,105.75 + plan review $718.74 + surcharges. Fees scale with project valuation per the city schedule.
How long does City of Renton take to review a home addition permit?
Typical review window: 30–120 days.