Side sewer permits in Renton: fees, timeline & requirements (2026)
Everything you need to know about pulling a side sewer permit in 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 Community and Economic Development — Development Services.
Free lookup, no account needed — your lot polygon, zoning, setbacks and overlays, cited to Renton's source.
When does side sewer work need a permit in Renton?
The side-sewer permit comes from the utility that owns the sewer main (the city, a sewer or water district, or a regional utility), under that utility's own code. Which utility is a per-property fact: a lot can sit inside a city for permitting and outside its sewer district, so confirm the owner of the main before applying. The utility's code, not a statewide rule, decides which work needs the permit: a new connection does, and many utility codes also require it for any repair, however short, and for capping or disconnecting a side sewer, so check that code before digging. WAC 51-56, the state plumbing code, governs how the building sewer is laid.
From Renton's own code
“Exception for Connection to Private Sewage System: Where a public sanitary or combined sewer is not available under the provisions of this Chapter, the building sewer shall be connected to a private sewage disposal system complying with the provisions of this Section. (Ord. 4343, 2-3-1992) B.”Source ↗verified 2026-05-17
Required submittals
- Site plan with sewer line route
- Depth + slope detail
- Cleanout locations
- Utility locate ticket
Inspection sequence
- Pre-cover (open trench)
- Air / water test
- Final
Contractor specialties needed
Side sewer contractor
Who can do this work in Renton?
Kolmo Construction is a licensed Washington general contractor — KOLMOL*753JS, active through April 10, 2027, bonded and insured — working throughout Renton and King County. Kolmo prepares the drawings and submittals, files the side sewer permit with Renton Community and Economic Development — Development Services, carries the project through review and inspections, and performs the construction. Call (206) 410-5100 for a Renton side sewer quote.
Notes & caveats
Issuing body is the sanitary sewer utility, NOT the building department, and inspection is the utility's too. SOME utilities additionally require the contractor to hold a side-sewer card or registration before they will issue; it is not universal, so check the serving utility's own rules rather than assuming either way.
How to apply yourself
- 1. Confirm your parcel's zoning & overlays. Run an address lookup for your side sewer work in Renton — 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: Renton Community and Economic Development — Development Services ↗
- 4. Track review. Respond to reviewer comments promptly.
- 5. Pay issuance fees (the sewer utility that serves the lot 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 Renton Community and Economic Development — Development Services, handles reviewer comments, and builds the project.
Licensed WA general contractor KOLMOL*753JS · bonded & insured
Side sewer permits in Renton — FAQ
When does side sewer work need a permit in Renton?
The side-sewer permit comes from the utility that owns the sewer main (the city, a sewer or water district, or a regional utility), under that utility's own code. Which utility is a per-property fact: a lot can sit inside a city for permitting and outside its sewer district, so confirm the owner of the main before applying. The utility's code, not a statewide rule, decides which work needs the permit: a new connection does, and many utility codes also require it for any repair, however short, and for capping or disconnecting a side sewer, so check that code before digging. WAC 51-56, the state plumbing code, governs how the building sewer is laid.
How much does a side sewer permit cost in Renton?
King County's sewer service area map shows about four fifths of Renton served by the City's own sewer utility, with parts served by Soos Creek Water and Sewer District, Cedar River Water and Sewer District and Coal Creek Utility District. Where the City serves the lot, apply via https://permitting.rentonwa.gov. Where a district serves it, the side sewer permit and its fees come from that district, under its own rules and fee schedule, not from the City, so confirm the lot's utility before applying. Districts: Soos Creek Water and Sewer District (https://www.sooscreek.com/), Cedar River Water and Sewer District (https://www.crwsd.com/), Coal Creek Utility District (https://www.ccud.org/).