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Plumbing Service Agreement Template (2026) — Free PDF

A plain-English plumbing contract for residential and light commercial work. Covers scope, permits, payment, access, warranty, and change orders — before anyone opens a wall.

6 min•July 25, 2026

What you’ll get from this guide

  • A plumbing agreement should state who pulls the permit and who pays for it. Water heaters, gas lines, repipes, and sewer replacements almost always need one, and the ambiguity is the single most common cause of disputes.
  • Always include a change order clause. Plumbing scope expands the moment a wall or a slab opens — your agreement should require written approval and a revised price before extra work begins.
  • Separate the labor warranty (typically 1 year) from manufacturer warranties on tanks, pumps, and fixtures, and list what voids coverage: freezing, tree roots, foreign objects, and work by others.

Download the Plumbing Service Agreement

No email required. This PDF covers residential service, water heater replacement, repipes, sewer line work, and light commercial plumbing contracts.

Disclaimer

This template is provided for general informational purposes only. Legal, tax, and regulatory requirements vary by business and jurisdiction, so you are responsible for reviewing and adapting it before use. LeadDuo makes no warranties and is not liable for outcomes resulting from use of this template.

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Why plumbing contractors need a written agreement

Most residential plumbing disputes come down to four things: who was supposed to pull the permit, what happened when the scope changed after the wall came open, who is responsible when a manufacturer part fails, and who pays for water damage that was already happening before you arrived. A well-drafted agreement resolves all four before the first fitting goes on.

Plumbing carries a specific risk other trades do not: concealed conditions. You quote a slab leak repair from a pressure test, then the access cut reveals corroded galvanized pipe across the whole run. Without a concealed-conditions clause, you are stuck between eating the difference and having a fight with the homeowner in their own kitchen. With one, you stop, document, price the change, and get a signature.

For light commercial and property management work, a written agreement also protects your payment terms. Commercial clients often run 30 to 60 day payment cycles — your agreement should state net terms, late fees, lien rights, and what happens to the job if payment stops mid-project.

What to customize before signing

Permit responsibility

State explicitly whether you pull the permit or the client does. In most jurisdictions the licensed plumber pulls it, because the permit attaches to the license. Note whether the fee is a pass-through at cost or already inside your price, and who schedules the inspection.

Scope of work definition

List exactly what is being done: fixture count, pipe material and diameter, the run being replaced, whether drywall repair and paint are included. Anything not listed is excluded — say so in that sentence. Wall and floor restoration is the most common assumed inclusion that is not actually included.

Concealed conditions and change orders

Add a clause covering what happens when the work exposes conditions that could not be seen at the estimate: corroded pipe, non-code work by a previous contractor, asbestos-wrapped lines, or rot. Work stops, the contractor documents it, and a written change order is issued before continuing.

Payment schedule

For service calls, payment is due on completion. For larger jobs use a deposit plus milestones: 30% deposit at material order, 40% at rough-in inspection pass, 30% at final inspection. Never let the unpaid balance exceed the value of the work you still have left to do.

Access, water shutoff, and pre-existing damage

Note who provides access, how long water will be off, and that pre-existing damage — stains, mold, prior leaks — is documented with photos at arrival and is not the contractor's responsibility.

Warranty terms

One year on labor is standard. Tanks, pumps, and fixtures carry the manufacturer warranty as a pass-through. State the exclusions clearly: freezing, tree root intrusion, foreign objects flushed into the line, water quality, and any modification by others.

How to use this agreement

Send it as soon as the estimate is accepted

The agreement is your handoff from selling to operating. Send it right after verbal acceptance — before you schedule the crew or order the water heater.

Walk the client through permits and restoration

Say out loud who pulls the permit, who pays the fee, and whether drywall and paint are included. Those two conversations prevent the majority of plumbing disputes.

Photograph pre-existing conditions before you start

Cabinet floors, ceiling stains, and slab cracks. Attach the photos to the signed agreement. On a water damage job this is the difference between a claim and an argument.

Collect the deposit before mobilizing

For jobs over $500, collect the deposit before scheduling. It confirms commitment and covers your material order — plumbing equipment is rarely returnable once it is on the truck.

Document every change order in writing

When scope expands mid-job, stop and get written approval before continuing. A text message with a photo and a price is enough — just make sure it lands in the job record.

Which agreement language fits which job

Job typePayment modelKey risk to addressAgreement emphasis
Residential service callDue on completionScope mismatch, extra partsItemized scope, parts list, change order clause
Water heater replacementDeposit + balance on completionCode upgrades, permit, haul-awayPermit responsibility, code items priced, warranty terms
Repipe or slab leak repairDeposit + milestonesConcealed conditions, restorationConcealed-conditions clause, restoration exclusions, access
Sewer line replacementDeposit + milestonesLocates, excavation, landscapingUtility locates, surface restoration scope, inspection triggers
Light commercial / property managementNet 30 or milestonePayment delay, scope creepNet terms, late fees, lien rights, PO and COI requirements

Choose one payment model per contract. Mixing a deposit schedule with net terms in the same document creates confusion and slows collection.

Plumbing Service Agreement FAQs

Who is responsible for pulling the plumbing permit?▼
In most US jurisdictions the licensed plumbing contractor pulls the permit for the work being performed, because the permit is tied to the license. Some states allow homeowners to pull an owner-builder permit on their own residence. Your agreement should state this explicitly — ambiguity here is the most common cause of plumbing disputes, and an unpermitted water heater becomes the homeowner's problem at resale.
What should a concealed conditions clause say?▼
Something like: 'If work exposes conditions that were not reasonably visible at the time of the estimate — including corroded piping, prior non-code work, structural damage, or hazardous materials — the contractor will stop work, document the condition, and issue a written change order. Work on the affected scope resumes only after written client approval.' This is the single most valuable clause in a plumbing contract.
Is wall and floor repair included in a plumbing contract?▼
Usually not, and that assumption causes more bad reviews than pricing does. State it in the scope: the contractor will cut access as needed and will patch to a rough state, or will not patch at all, and finish drywall, tile, and paint are excluded unless separately quoted. Say it out loud during the walkthrough too, not just in the paperwork.
How long should a plumbing labor warranty be?▼
One year on labor is the residential standard. Some shops offer two years on repipes and larger installs. Equipment carries the manufacturer warranty — commonly 6 to 12 years on a water heater tank, 1 to 5 years on pumps and fixtures. State both separately, and note maintenance requirements that keep coverage alive, such as an annual water heater flush.
Do I need a written agreement for small residential plumbing jobs?▼
For anything over a few hundred dollars, yes. Even a one-page agreement with scope, price, payment terms, and a warranty statement protects you. For service calls under about $300, a written work order signed at completion is typically enough — but if you are cutting into a wall or touching a gas line, use the full agreement regardless of ticket size.
What payment schedule should I use on a repipe?▼
A common structure is 30% deposit at material order, 40% at rough-in inspection pass, and 30% at final inspection and cleanup. Keep the unpaid balance roughly proportional to the work remaining so neither side is exposed. Many states cap residential deposits — check your local contractor board before setting the deposit percentage.
Is this template legally compliant?▼
This is a practical starting point for common plumbing contractor situations, not legal advice. Requirements vary by state, license class, and job type — residential versus commercial, public work, and mechanic's lien procedures all differ. Have a local attorney or your contractor association review it before using it on high-value or commercial contracts.

Related Plumbing Templates and Tools

The agreement is the middle step of a complete plumbing paperwork system:

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