Doing Part of Your Own Bathroom Remodel: Washington Rules for Homeowners

Plenty of homeowners take on part of a bathroom remodel themselves: the demolition, the painting, sometimes the tile or a new vanity. Washington is relatively generous to owners working on their own homes, but the exemptions are about licensing, not about permits or safety rules. This page sets out what an owner may do, what still requires a permit and inspection, and what changes when you mix your own work with a contractor's, as of October 2026.

What the state lets owners do

Registration: working on your own property

RCW 18.27.090(12) exempts "Any person working on his or her own property, whether occupied by him or her or not, and any person working on his or her personal residence". The exemption does not apply to someone doing contractor work on their own property "for the purpose of selling, demolishing, or leasing the property".

Acting as your own general contractor is a grayer area. The statutory definition of "contractor" includes a person who, on their own property, "employs members of more than one trade upon a single job or project or under a single building permit". How that interacts with the owner exemption when you hire a plumber, an electrician and a tile setter separately is not settled by anything we read. If you plan to coordinate several trades yourself, ask L&I first (contractor information line 1-800-647-0982).

Plumbing your own bathroom

RCW 18.106.150(1): "Nothing in this chapter shall be construed to require that a person obtain a license in order to do plumbing work at his or her residence or farm or place of business or on other property owned by him or her." L&I puts it simply: "Property owners can perform their own plumbing work on properties they own." Friends and relatives may help, as long as none of them hold themselves out as being in the plumbing trade.

The exemption does not touch the permit. RCW 18.106.150(3) says it does not "derogate from or dispense with the requirements of any valid plumbing code". In the City of Vancouver, removing and reinstalling the same toilet, sink or tub is exempt from a plumbing permit only where it does not involve "replacement or rearrangement of valves, pipes or fixtures". A new fixture, a moved drain or a new shower valve is not on the exempt list. Details are in plumbing permits for bathrooms.

Electrical work and the owner permit

RCW 19.28.261(1) lets you do electrical work at your residence or other property you own, unless "(a) The electrical work is on the construction of a new building intended for rent, sale, or lease; or (b) The electrical work is on property that is offered for sale within 12 months after obtaining the property."

L&I's owner permit form (F500-094-000) adds practical conditions: your name or your company's name must be on the deed, and "Real estate agents, property management companies, relatives, etc. cannot purchase permits for the property owner." You certify that you will do the work yourself. L&I also says: "We strongly encourage you to hire an electrical contractor for all electrical work."

Request inspection "prior to covering any electrical work, no later than 3 business days after completing the work or 1 business day after any part of the installation has been energized, whichever occurs first."

Hiring helpers directly

Paying someone by the hour to help with your bathroom has consequences people rarely consider. L&I warns that if you hire an unregistered person, "you could be considered that person's employer, with wage, tax, workers' comp, safety, and record-keeping requirements", and that "Most homeowner policies do not cover workers." If a helper is injured, you may be exposed. Hiring registered contractors for discrete parts of the job avoids that problem; check them as described in checking a bathroom contractor's credentials.

Lead and asbestos still apply to the materials

Exemptions from the paperwork do not change what is in your walls and floor.

• Lead: the EPA says the RRP rule "does not apply to homeowners doing RRP projects in their own pre-1978 homes", except if you rent all or part of the home, operate child care there, or renovate and sell for profit. The dust is the same either way. See lead paint and bathroom remodels.
• Asbestos: SWCAA waives the AHERA inspection only when the owner-occupant does the work personally, and still requires suspect materials to be treated as asbestos unless lab analysis shows otherwise, with prior notification to SWCAA. See asbestos in old bathroom tile, vinyl and mastic.

Mixing your work with a contractor's

Splitting a bathroom between you and a contractor can work, but it needs clear lines:

• Write down the split. The contract should list what you will do, by when, and what condition the room must be in when the contractor arrives.
• Settle the permit. One permit usually covers one job. Decide who applies, whose name is on it and who calls for inspections. The City of Vancouver application asks whether work is performed by the contractor or the owner.
• Ask how the warranty treats your work. A contractor's workmanship warranty normally covers its own work. If your waterproofing or rough plumbing sits under its tile, ask in writing how a later leak would be handled.
• Protect the schedule. If your part runs late, the trades behind it wait.

Unpermitted owner work causes problems at sale: Washington's seller disclosure asks whether building permits and final inspections were obtained for remodeling. If that is already your situation, see unpermitted bathroom work.

When to hand it over

Owners do well with demolition in newer homes, painting and accessories. The parts that are hardest to redo are the ones hidden behind tile: shower waterproofing, valves and drains. JDI handles permits and project management on the projects we take on, and our free in-home consultation is a good place to talk through which parts you might do yourself. Start on our Vancouver bathroom remodeling page.