Stormwater permits in Redmond: fees, timeline & requirements (2026)
Everything you need to know about pulling a stormwater / drainage permit in Redmond, Washington — when one is required, what it costs, how long review takes, what documents are required, and which inspections you can expect. Cited to Redmond Planning and Community Development.
Free lookup, no account needed — your lot polygon, zoning, setbacks and overlays, cited to Redmond's source.
When does drainage work need a permit in Redmond?
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 Redmond's own code
“A. All clearing, grading and stormwater management construction activities that do not involve any of the thresholds listed above do not require a separate clearing and grading, and stormwater or civil site stormwater permit, but still must meet the requirements specified in RMC 15.24.020. B.”Source ↗verified 2026-05-29
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 contractor
Who can do this work in Redmond?
Kolmo Construction is a licensed Washington general contractor — KOLMOL*753JS, active through April 10, 2027, bonded and insured — working throughout Redmond and King County. Kolmo prepares the drawings and submittals, files the stormwater / drainage permit with Redmond Planning and Community Development, carries the project through review and inspections, and performs the construction. Call (206) 410-5100 for a Redmond 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 drainage work in Redmond — we'll pull your specific lot polygon, zoning, setbacks, and any shoreline, critical-area or historic overlays.
- 2. Assemble submittals: the 4 documents under Required submittals above.
- 3. Submit through the city portal: Redmond Planning and Community Development ↗
- 4. Track review. Respond to reviewer comments promptly.
- 5. Pay issuance fees (Redmond's fee schedule sets them) and pick up the permit. Inspection card travels with the job.
Or have Kolmo do it
Kolmo prepares the drawings and submittals, files with Redmond Planning and Community Development, handles reviewer comments, and builds the project.
Licensed WA general contractor KOLMOL*753JS · bonded & insured
Stormwater permits in Redmond — FAQ
When does drainage work need a permit in Redmond?
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 Redmond?
Redmond's clearing, grading and stormwater review of a single-family project is $1,399.30 for plan review and $1,023.23 for inspection (the inspection line reads single-family residential, 50 to 100 cubic yards). The citywide stormwater capital facilities charge is $2,310 for each 2,000 sq ft of impervious area, due at building permit issuance. A 4% technology surcharge applies (Development Engineering Fee Schedule, effective 2/1/2026). Apply through the Redmond ePermitting Service, REPS (https://cityofredmondwa-energovweb.tylerhost.net/apps/selfservice); plan-reviewed permits go through Plan Review Online, and the How to Apply page (https://www.redmond.gov/462/How-to-Apply) says which.