Short definition

A plumber estimate is a written cost estimate provided before work begins, ideally including labor hours, material list, project timeline, and warranty terms. Under WA RCW 19.86 (Consumer Protection Act), deceptive estimating practices expose contractors to treble damages plus attorney fees. Always get it in writing.

What it is

Two key terms get confused. A quotation in UK practice is a fixed-price commitment; an estimate is approximate and subject to change. US practice often uses “estimate” for both. Read the document for “approximate,” “subject to change,” “not to exceed,” or “fixed price.”

Three pricing structures dominate residential work:

  • Time-and-materials (T&M). Hourly labor plus parts. Fair for unknown-scope work.
  • Fixed-price. One number for the whole job. Fair for known-scope work.
  • Hybrid. Fixed price plus extras at T&M. Watch the open scope — extras can become unbounded.

Typical 2026 WA market numbers:

  • Service-call dispatch fee: $50–$150 (often credited toward work if hired)
  • Hourly residential labor: $100–$200/hr
  • Specialty (sewer, hydronic, gas): $150–$300/hr

For a small repair, ±10% estimate variance is reasonable. Anything above ±25% on a quote is a red flag.

Why it matters to a homeowner

Six load-bearing rules for any WA plumbing estimate:

1. Always written

Verbal estimates are not enforceable under RCW 19.86 disputes — the burden of proof shifts to you. A signed written estimate is your protection.

2. Demand a breakdown

A $5,000 quote for “complete repipe” with no measurement, no scope, no breakdown is not an estimate — it’s a number the contractor made up. Ask for hours times rate, materials list with prices, permit fees, disposal fees, and taxes. Without a breakdown, you can’t compare quotes apples-to-apples.

3. Change orders go in writing

Anything beyond the original scope must be a written change order. Per RCW 19.86 + RCW 60.04 framework, verbal-add-on disputes favor the homeowner if documentation is on the homeowner’s side.

4. Deposit limits

WA contractor norms: 10–25% deposit is reasonable; 50% upfront should be a flag, especially for a first-time relationship. Get a written contract with milestone payments tied to inspection passes. For specially-ordered materials (custom tubs, bespoke fixtures), paying for the material at order is reasonable; paying for labor in advance is not.

5. “Today only” pricing is a flag

High-pressure sales tactic. RCW 19.86 deceptive-practice claim applies. The cooling-off rule (3 business days) applies if door-to-door initiated. Walk away.

6. Lien-release docs at each milestone

WA RCW 60.04 mechanic’s lien gives subcontractors lien rights even after you’ve paid the prime. If your prime hasn’t paid the subs, they can lien your property. Lien-release documentation at each progress payment is the protection.

Common variants and not the same as

  • Estimate (rough) vs. quote (fixed-price). UK distinction. Read the document text.
  • Time-and-materials vs. fixed-price. Pick based on scope clarity.
  • Verbal vs. written. Always written.

Common scenarios

  • Three quotes for a side-sewer replacement. Compare scope, materials, timeline. Lowest is often skipping inspections or using non-code materials.
  • HPWH installation quote. Verify it includes the rebate paperwork (PSE / SCL / Tacoma Power / Snohomish PUD). Some plumbers charge for rebate-app admin; some include it free.
  • Toilet replacement quote. Verify it includes flange repair (often hidden cost), wax ring, supply line, and disposal of old toilet.
  • Door-to-door “free inspection” leading to a $5,000 quote on the spot. Invoke the 3-day cooling-off, get other quotes.

Washington note

RCW 19.86 (Consumer Protection Act) makes “unfair methods of competition and unfair or deceptive acts or practices in the conduct of any trade or commerce” unlawful. Treble damages may be awarded — up to 3x actual damages plus attorney fees. RCW 63.14.154 plus FTC Cooling-Off Rule give 3 business days to cancel door-to-door contracts over $25. RCW 60.04 governs mechanic’s lien — subcontractors keep lien rights even after you’ve paid the prime.