Key Takeaways

  • Permits are required for most plumbing work beyond minor repairs in King and Pierce County, per local code.
  • Typical permit fees for residential plumbing projects range from $75 to $400, depending on scope.
  • Inspections are mandatory and usually scheduled within 1–3 days after work completion.
  • Unpermitted work can block home sales and trigger fines or costly corrections during resale or insurance claims.

Plumbing permits are required in King and Pierce County for most work beyond small repairs, like water heater swaps, repipes, and new fixture installs. The local code follows the Uniform Plumbing Code (UPC), and both counties enforce permits and inspections to make sure jobs are safe and legal.

When do you need a plumbing permit in King or Pierce County?

Any plumbing change that alters or extends piping, replaces a water heater, adds new fixtures, or modifies drainage generally needs a permit. Swapping out a faucet or clearing a clog does not.

Most jobs beyond a quick repair require permits—water heater replacements, repipes, bathroom or kitchen remodels, and any work on main water or sewer lines.

Common jobs needing a permit:

  • Water heater replacement (tank or tankless)
  • Whole-house or partial repipes (PEX, copper, etc.)
  • Adding a bathroom or moving fixtures
  • Side sewer repairs or replacements
  • Adding irrigation lines tied to potable water

Jobs usually NOT needing a permit:

  • Unclogging drains
  • Replacing a faucet or toilet (if not moving pipes)
  • Simple leak repairs at shutoffs or supply hoses

Check local city or county websites for specifics, as some cities (like Seattle or Tacoma) have stricter requirements than unincorporated county areas.

How does the plumbing permit process work?

The process starts by submitting a permit application with your city or county permit office (online for most areas like King County, Pierce County, Seattle, Kent, Maple Valley, Bonney Lake). You’ll describe the scope, property address, and usually include a simple drawing or plan.

Once filed, you’ll pay a fee based on project size and number of fixtures. Basic jobs (like a water heater) can get same-day approval. Larger projects may take a few days. You’re then authorized to start work.

After the work is done—but before closing up walls or burying pipes—an inspector must review the job. Most inspections are scheduled online or by phone, typically available within 1–3 business days. If you pass, you’re good to finish. If not, the inspector will explain corrections to make before a reinspection.

How much do plumbing permits and inspections cost?

Fees vary by location and project type. As of 2026, here’s what you can expect for common residential jobs:

  • Water heater permit: $75–$250 (higher for tankless or if gas piping involved)
  • Full repipe: $200–$400 (depends on home size and fixture count)
  • Side sewer repair: $150–$350 (plus possible road impact fees)
  • Small bath or kitchen addition: $100–$250

Seattle and Tacoma tend to be pricier than unincorporated areas. The cost covers both the permit and the final inspection.

What happens if you skip the permit or inspection?

Unpermitted plumbing work is considered illegal by King and Pierce County. If found, the county can require you to open up finished walls for inspection, issue fines, or even force removal and redo of work.

More commonly, unpermitted work becomes a problem when selling your house. Buyers, inspectors, or title companies may flag missing permits. This can stall a sale or force expensive corrections. Insurance claims after a leak or fire may also be denied if unpermitted work is discovered.

How do plumbing inspections actually work?

A county or city inspector will check that work matches the permit and meets UPC requirements. For water heaters, they’ll verify seismic strapping, venting, and drain pans. For new plumbing or repipes, they’ll check pipe sizing, support, and leak test the lines.

You (or your plumber) need to leave work accessible: don’t close up drywall or bury trenches until after inspection.

Inspection takes about 10–30 minutes, depending on job size. You’ll get a pass/fail on the spot, with corrections listed if needed.

What’s different about permits for older homes and remodels?

Homes in Seattle, Kent, and surrounding areas built before 1970 often have galvanized or mixed piping. Remodels in these homes usually trigger permit requirements for any new pipe runs or fixture moves. If you’re opening up walls or replacing a main line, expect the inspector to look for code upgrades—anti-scald valves, proper venting, and sometimes seismic upgrades.

Remodels that convert unfinished basements to living space, or add bathrooms, always need permits. Bringing plumbing up to current code can add cost, but you avoid future headaches.

Who pulls the permit, and does it matter?

Licensed plumbers (like Valor Plumbing, license VALORPL*832KT) can pull permits on your behalf, or you can apply as a homeowner if you’re doing your own work. If hiring a plumber, it’s standard for them to handle permits and coordinate inspections.

If you do it yourself, you’re responsible for both the work and passing inspection. Unlicensed work on rental properties is not allowed—King and Pierce County require licensed contractors for work on any property you don’t live in.

Is it worth the time and cost to get permitted?

Permits add some paperwork and cost, but they protect you from fines, resale issues, and insurance trouble. They also ensure the job meets safety standards—especially important for gas lines, water heaters, and drain work. In King and Pierce County, being able to show permits for major plumbing jobs reassures buyers and inspectors.

For questions or help navigating local permit rules, a licensed plumber familiar with King and Pierce County (like Valor Plumbing at (425) 691-8064) can usually advise based on your address and project details.

Frequently Asked Questions

When do I need a plumbing permit in King or Pierce County?

You need a permit for work like water heater replacements, repipes, new fixture installs, or any job that alters plumbing piping. Simple repairs or fixture swaps usually don't require one.

How much does a plumbing permit cost in King or Pierce County?

Permit fees typically range from $75–$400 depending on job type, city, and project complexity. Water heaters are on the lower end, full repipes or side sewer work cost more.

What if I skip the permit or inspection?

Unpermitted work can lead to fines, forced tear-outs, or problems with home sales and insurance claims if discovered. It's usually not worth the risk.

Can I pull a plumbing permit myself, or does my plumber have to do it?

Homeowners can pull permits for work on their own homes. If you hire a plumber, it's standard for them to handle the permit and inspections.

What happens during a plumbing inspection?

An inspector checks that the work matches the permit and meets code. They look for proper materials, installation, and sometimes require pressure testing. You get a pass/fail on the spot.