Plumbing Permits in Lake Stevens, WA

Last updated: October 2026

"Can a homeowner do their own plumbing in Washington state?" is one of the most common questions we hear from Lake Stevens homeowners. The short answer is yes, with limits — and the permit is the part people skip. Here is how it actually works, without the legalese.

Can a homeowner do their own plumbing in Washington state?

In most cases, yes. Washington allows a homeowner to perform plumbing work on their own residence — the house you own and live in. But "allowed to do the work" and "allowed to skip the permit" are different things. Permits and inspections are still generally required for anything beyond minor repairs, and the work still has to meet code.

The hard lines: you cannot do plumbing work for hire or on someone else's property without the proper license, and rental properties you own but do not live in generally do not qualify for the homeowner exemption. Rules change, so verify the current requirements with the City of Lake Stevens permit center and the WA Department of Labor and Industries (L and I) before you start.

When is a plumbing permit required in Lake Stevens?

As a rule of thumb: if you are adding, moving, or replacing the plumbing system itself, you need a permit. That generally includes:

• New plumbing installations — additions, ADUs, new construction, new bathrooms.
• Relocating fixtures or pipes — moving a toilet, shower, or sink to a new spot.
• Water heater replacement. Yes, even a like-for-like swap generally needs a permit and inspection — venting, the T and P relief valve, seismic strapping, and gas or electrical connections all get checked.
• Sewer and water line work — repairs, replacements, and new connections.
• Repipes — whole-house or partial supply-line replacement.
• Gas piping — new or modified gas lines, no exceptions worth arguing about.

Simple like-for-like repairs — swapping a faucet, replacing a toilet with the same rough-in, changing a supply line — usually do not need a permit. When in doubt, call the permit center and ask. A five-minute call beats opening a finished wall later.

How do permits and inspections work?

The process is straightforward: apply (in person or online through the City), pay the fee, do the work, and schedule inspections at the required stages — typically a rough-in inspection before walls close and a final inspection when fixtures are set. For new construction there is also an underground inspection before backfill.

When you hire a plumber, they typically pull the permit as part of the job — it is in our bid, and we schedule the inspections. If you are doing the work yourself as the homeowner, the permit goes in your name and you schedule your own inspections. Permit fees are set by the jurisdiction and scale with project scope; the City of Lake Stevens permit center publishes the current fee schedule.

What happens if you skip the permit?

Plenty of unpermitted work never gets caught — until it matters. The real costs show up at sale time (a buyer's inspector flags it), in an insurance claim (unpermitted work can complicate or void coverage), or when the city finds out and orders walls opened for inspection or the work redone. There is also no record the work met code, which is exactly what a future buyer wants to see. The permit fee is small compared to any of those outcomes.

When should you hire a plumber instead of DIY?

Honest guidance: DIY makes sense for accessible, low-risk work — fixture swaps, supply lines, a new faucet, a toilet replacement. Hire a licensed plumber for gas lines, sewer work, repipes, water heaters, anything buried inside walls you cannot easily revisit, and any job where a mistake means flooding the house. Also hire one when the permit process itself is the obstacle — we pull permits and handle inspections every week.

If you are weighing DIY against hiring out, a written quote lays out the pro option. Contact Eby Plumbing — and if you are vetting plumbers generally, our how to hire a plumber guide covers what to check, including verifying any plumber's license at WA L and I.