Short answer
Yes. Repairing, replacing, lining or bursting a side sewer in Seattle requires a side sewer permit — issued by Seattle Public Utilities since October 1, 2025 — and the work must be done by a contractor registered with the city for side sewer work. The contractor applies, the city reviews the route and method, and an inspector signs off the finished work before it is buried. The permit record then stays with the property.
What the permit is for
The side sewer is private, but it connects to a public system, crosses the public right-of-way, and can affect neighbors and the street. Seattle's side sewer code requires a permit so the city knows what was installed where, can check that it was installed properly, and can keep a record for the next owner. The permit is not a formality: the inspection is a real second set of eyes on the work before it disappears underground.
The process, from the homeowner's side
- Inspection and proposal. The contractor scopes the line and proposes a method and route.
- Application. The contractor applies to Seattle Public Utilities with the site plan, the route, the method (repair, replace, line, burst), and the connection details. Work in the right-of-way — the strip between the property line and the main — adds a street-use element.
- Review. The city checks the plan against the code: pipe size and material, grade, cleanout requirements, connection to the main, and whether the line is on a combined or separated system.
- Utility locates. Before any excavation, public utilities are marked.
- Work. Per the approved plan. Changes in the field are called in.
- Inspection. The inspector sees the work before backfill — new pipe, connections, bedding, or the post-lining video for a liner — and signs it off.
- Record. The finalled permit becomes part of the property's file, searchable by address.
What the inspector actually checks
| Item | Why |
|---|---|
| Pipe material and size | Code-approved pipe, sized for the building |
| Grade | Enough fall to carry solids; no new bellies |
| Bedding and backfill | Compacted so the new pipe does not settle |
| Joints and transitions | Proper couplings between old and new material |
| Cleanouts | Required at set points; often the reason a house finally gets one |
| Connection at the main | Correct wye or saddle, not a broken-in tap |
| Liner (for lining) | Post-lining video; ends and reinstated branches |
| Storm separation | No roof or footing drains tied in on a separated block |
Why it matters to you
- Warranty. Reputable contractors will not warrant unpermitted work; insurers and buyers do not recognise it.
- Sale. The permit record is how the next buyer verifies that "sewer replaced in 2026" actually happened.
- Quality. An inspector who sees loose backfill or a bad connection has it fixed before it is your problem.
- Neighbors. On a shared line, the permit process is where the shared status gets documented.
Timing
Straightforward permits are issued in days; ones involving the right-of-way, a shared line, or an unusual route take longer. The timeline article puts it in context. A contractor who proposes to start tomorrow on a replacement has either already pulled the permit or is not planning to.
Checking a contractor's standing
Two lookups: the state's L&I contractor registration, which shows licence, bond and insurance, and the city's list of registered side sewer contractors. Both are public. Our sewer repair page lists ours, and the questions to ask article includes the permit questions worth putting to anyone bidding.
Questions people also ask
Does cleaning need a permit?
No. Cabling, jetting and camera inspection are maintenance. A permit is required once the pipe itself is repaired, replaced, lined, or reconnected.
Who pulls the permit — me or the contractor?
The contractor. Seattle requires side sewer work to be done by a contractor registered for it with the city, and that contractor is the applicant. A contractor who asks you to pull it, or proposes skipping it, is telling you something.
What happens if work was done without a permit?
It usually surfaces at sale, when the buyer's title or inspection review finds no record of a repair the seller describes. Unpermitted work can require re-inspection or redo, and it voids most warranties.
What about the suburbs?
Shoreline, Edmonds, Lynnwood, Bellevue, Kirkland, Redmond, Bothell, Kenmore and Everett each permit side sewer work through their own public works or building department, sometimes through a sewer district. The principle is the same: permit, registered contractor, inspection.
More of the questions we hear every week are on the FAQ page .
Sources
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