Most homeowners assume permits are only for major renovations. The reality in Snohomish County (and the City of Everett within city limits) is that a lot of routine plumbing work technically requires a permit — and the inspector enforcement varies depending on whether the work eventually gets discovered on resale or refinance. Here’s the actual list of what triggers a permit, what doesn’t, and where the gray areas are.
Work That Definitely Requires a Permit
Per Washington Administrative Code 51-56 (Washington adopts the Uniform Plumbing Code with state amendments) and local Snohomish County/Everett implementation, the following work requires a permit. No real gray area.
- Water heater replacement, including like-for-like swaps
- Any new fixture installation (adding a bathroom, half-bath, laundry hookup, etc.)
- Moving any existing fixture more than a few feet from its original location
- Repiping any portion of the supply or drain system
- Water line replacement between the meter and the house
- Sewer line replacement or trenchless repair
- Gas line work — installation, modification, or extension
- Backflow preventer installation
- Any work tied to a building permit (kitchen remodel, bath remodel, addition)
Work That Doesn’t Require a Permit
Routine maintenance and minor repairs don’t trigger permits. The rule of thumb: if the work is replacing a like-for-like component in its existing location with no changes to the plumbing system itself, it’s usually permit-free.
- Replacing a faucet, valve, or fixture trim
- Toilet replacement (like-for-like, same location, no flange or supply line changes)
- Sink replacement (same location, no plumbing modifications)
- Drain cleaning, snaking, hydro jetting
- Clearing clogs, leak repair on a single fitting
- Garbage disposal replacement
- Water filter installation under a sink
Why It Matters (Even When Inspectors Don’t Catch You)
Three reasons we tell every homeowner to permit the work that requires it. First — resale. Permit history is searchable, and any work without a permit that should have had one becomes a disclosure issue at sale. We’ve seen Everett homes lose $5,000–$15,000 in negotiation because of unpermitted water heater swaps from a decade earlier. Second — insurance. If a water heater catches fire or a gas line leak causes damage, insurers can deny claims when the underlying work wasn’t permitted. Third — safety. Permits exist because someone died from the failure they’re designed to prevent. Earthquake strapping on water heaters, T&P discharge piping, expansion tanks on closed systems — all came from real failures.
The 2025 Washington Plumbing Code (Seattle’s version is essentially the state code with municipal amendments) adds a few new items worth knowing — our 2025 Seattle/Washington plumbing code summary covers the recent changes. If you’re planning a remodel, our renovation plumbing tips cover when to pull permits proactively vs. retroactively.
Permit Costs and Process in Everett
Snohomish County and the City of Everett both have online permit portals. For most residential plumbing work, the permit cost is $75–$250 depending on scope and number of fixtures. Inspection typically happens within 5–10 business days after the work is complete. Licensed plumbers (us included) pull the permit on behalf of the homeowner as part of the job — DIY homeowners can pull their own but inspections are still required.
If you’re not sure whether your project needs a permit, ask before you start. We pull permits routinely for work we do — it’s already built into our quotes. Our plumbing remodeling team handles permitting for major projects, and the Everett plumbing crew handles it for routine work where required.
