Stormwater permits in City of Renton: fees, timeline & requirements (2026)
Everything you need to know about pulling a stormwater / drainage 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 stormwater / drainage need a permit in City of Renton?
Ecology's Stormwater Management Manual for Western Washington (SWMMWW, 2024 edition) is the state floor. A municipal stormwater permittee may instead adopt a REGIONAL manual Ecology has determined equivalent, and most do — some counties publish their own, some cities publish their own, and others adopt Ecology's directly. WHICH MANUAL APPLIES IS A PER-JURISDICTION FACT and it changes the numbers: review thresholds for new plus replaced impervious surface and for land-disturbing activity differ between manuals, so read this jurisdiction's own adopting chapter before quoting one. Critical-area and closed-basin parcels get stricter review under every manual.
From City of Renton's own code
“EXEMPTIONS: No person shall do any mining, excavation or grading without first having obtained a special permit from the Hearing Examiner and an annual license issued by the Development Services Division with the concurrence of the Building Official, except for the following: 1. An excavation below finished grade for basements and footings of a building, retaining wall or other structure authorized by a valid building permit.”Source ↗verified 2026-09-24
What City of Renton says in its own permit handout
From Building Permits FAQ, published by City of Renton. This is the jurisdiction's own guidance on its permit process, not the ordinance text — where the two differ, the code governs.
“Civil Construction and/or Utility Permits: a permit may be required when a project is proposed to result in: More than 500 square feet of new or replaced impervious area. More than 7,000 square feet of land disturbing activity.”Handout ↗read 2026-09-05
Required submittals
- drainage report (full or simplified)
- site plan with impervious calc
- BMP / facility detail
- geotech if infiltration claimed
Inspection sequence
- pre-construction (BMPs in place)
- facility installation
- final stabilization
Contractor specialties needed
general
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 stormwater / drainage 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 stormwater / drainage quote.
Notes & caveats
Issuing body is city public works / county DPER, often parallel to the building permit. On-site infiltration / detention required where infeasible to discharge to municipal storm. Critical-area parcels (steep slope, salmon-bearing watercourse) get more conservative review.
How to apply yourself
- 1. Confirm your parcel's zoning & overlays. Run an address lookup for your City of Renton stormwater / drainage — we'll pull your specific lot polygon, zoning, setbacks, and any shoreline/ECA/historic overlays.
- 2. Assemble submittals (4).
- 3. Submit through the city portal: Renton uses TRAKiT permits portal. ↗
- 4. Track review. Respond to reviewer comments promptly.
- 5. Pay issuance fees (Drainage review fees are commonly tiered by project size in the city's fee schedule. Apply via https://permits.rentonwa.gov.) and pick up the permit. Inspection card travels with the job.
Or have Kolmo do it
We pull stormwater / drainage 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
Stormwater permits in City of Renton — FAQ
When does a stormwater / drainage need a permit in City of Renton?
Ecology's Stormwater Management Manual for Western Washington (SWMMWW, 2024 edition) is the state floor. A municipal stormwater permittee may instead adopt a REGIONAL manual Ecology has determined equivalent, and most do — some counties publish their own, some cities publish their own, and others adopt Ecology's directly. WHICH MANUAL APPLIES IS A PER-JURISDICTION FACT and it changes the numbers: review thresholds for new plus replaced impervious surface and for land-disturbing activity differ between manuals, so read this jurisdiction's own adopting chapter before quoting one. Critical-area and closed-basin parcels get stricter review under every manual.
How much does a stormwater / drainage permit cost in City of Renton?
Current fee per the City of Renton fee schedule: Drainage review fees are commonly tiered by project size in the city's fee schedule. Apply via https://permits.rentonwa.gov.. Plus ancillary plan-review/tech-surcharge fees per city schedule.