What should a plumber contract include?
A solid plumber contract names the parties, defines scope with materials, locks the total price, sets a payment schedule, lists warranty terms, and explains how change orders and disputes are handled.
The 10 essential clauses
(1) Parties and addresses, (2) detailed scope with materials, (3) total price and payment milestones, (4) start and target completion dates, (5) license and insurance proof, (6) warranty terms, (7) permit responsibility, (8) change-order process and pricing, (9) cleanup and disposal obligations, (10) dispute-resolution clause.
Payment schedule guardrails
Standard for plumbing: 10–25% deposit, progress payments tied to milestones, 10% retainage held until final inspection. Never agree to "pay in full before completion."
Change orders kill more projects than scope
Require every change in writing, signed by both parties, with a new price before any work proceeds. The #1 cause of contractor disputes is verbal change-order chaos.
Dispute resolution
Prefer mediation or small-claims jurisdiction over mandatory arbitration. Always include a clause requiring written notice and a cure period before escalation.
Frequently asked questions
Should a plumber provide the contract?
Yes — they should provide it, but review every line. Strike anything that gives them unilateral rights you wouldn't grant.
Are template contracts okay?
For small jobs yes. For projects over $10k, have an attorney review or use an AIA-style standard contract.
What if the plumber won't sign a contract?
Walk away. Refusing a written contract on any meaningful job is a textbook scam indicator.
Keep reading
What it costs
Before you call a pro
Common problems
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