Workmanship Warranty: How to Write One That Protects You and the Customer

Eleven months after your crew installed a new shower valve, the homeowner calls about a leak. Your tech pulls the trim and finds someone swapped the cartridge for a cheaper one from a big box store, and the drip is coming from the replacement. The homeowner points to the line on your invoice that reads "one year warranty on all work." Nothing on that invoice says what "all work" covers, what voids it or who decides, and a workmanship warranty written as a single sentence leaves both of you guessing at the exact moment you need an answer.

A well-built warranty tells the homeowner what you stand behind, for how long and what they have to do to keep it valid. It gives your office a rule for callbacks. It keeps a fair claim from turning into a fight, and it gives you solid footing when a claim has nothing to do with your work.

Your labor and the manufacturer's product are separate promises

Most home-service jobs carry two kinds of warranty at once. The manufacturer warrants the product: the condenser, the water heater, the shingles, the flooring. You warrant the workmanship, meaning the installation, the connections, the cuts, the fastening and the labor that put the product in place.

Homeowners tend to blur the two, so your paperwork shouldn't. California's contractor licensing board tells homeowners that a home improvement contract should list the contractor's warranties for labor and materials, which part of the work is covered and the length of the warranty, plus any manufacturer warranties. That makes a handy template wherever you work: name what you cover, name what the manufacturer covers and give each a time period.

When a product fails, your role is usually to help the homeowner file the manufacturer claim and to quote the labor to swap the part, unless your own warranty includes that labor. Spell out which one applies, because "the part is under warranty" often gets heard as "the repair is free."

Where federal warranty law fits a contractor warranty

Contractors hear a lot about the Magnuson-Moss Warranty Act, and it reaches less of their work than many assume. The Federal Trade Commission's Businessperson's Guide to Federal Warranty Law is the best place to read about it, and a few points stand out for home-service work.

The Act covers written warranties on consumer products. The guide states that it does not apply to warranties on services and that only warranties on goods are covered.

Labor can get pulled in when parts are included, though. The FTC explains that the Act applies if a warranty covers both the parts provided for a repair and the workmanship in making that repair, and it gives the example of a carpet warranty covering defects in materials or workmanship, including installation. The guide also says covered products include property attached to or installed on real property, such as many household fixtures and appliances.

Nobody is required to offer a written warranty. If you do offer one on a consumer product, the FTC notes you can't disclaim implied warranties on that product, and the guide warns that tie-in provisions, which require the customer to buy a particular brand or service to keep the warranty, are generally not allowed unless that item is provided free.

Put together, a pure labor warranty on a drain cleaning or a paint job generally sits outside the federal Act, while one that bundles parts you supply with your installation may fall within it. State law adds its own rules on implied warranties and home improvement contracts, and those differ widely. Read all of this as an overview, not legal advice. If your warranty covers parts and labor together, or you work across state lines, have an attorney review the wording before it goes on your paperwork.

Six sections every written workmanship warranty needs

Keep it to one page that a homeowner can read at the kitchen table in two minutes.

1. What's covered. Tie the description to the job: "installation of the new 50 gallon water heater, including gas, water and vent connections" instead of "plumbing work." For multi-part jobs, list each part or reference the scope in the contract.

2. How long coverage lasts and when it starts. Pick a start date the homeowner can verify, such as the completion date or the date of final payment, and name it. Choose a length that fits your trade and your confidence in the work. Different parts of one job can carry different terms.

3. What's excluded. Most arguments get settled here. Common exclusions include damage from misuse, neglect or accidents; changes or repairs by anyone other than your company; normal wear; settling, weather events and other conditions outside your control; and pre-existing conditions you documented before starting. Keep exclusions fair and specific. A list that carves out nearly everything reads as a warranty in name only and invites distrust.

4. What the homeowner needs to do. Reasonable conditions are normal: report a problem promptly, give you access to inspect and hold off on repairs, apart from stopping an active leak or other urgent damage, which they should photograph. If maintenance affects coverage, say what kind. A furnace that never got a filter change is a different claim from one serviced on schedule.

5. How you'll fix a covered problem. Most workmanship warranties promise to repair or redo the defective work at no charge. Say whether you choose the repair method and what happens when a manufacturer's part is involved. Then say where the promise stops: redoing your own work only, or also the damage the defect caused, like a vanity cabinet soaked by a leaking connection, and whether opening and restoring finishes to reach the problem is included.

6. How to make a claim. A phone number or email, what to include (address, job date, photos) and roughly how fast you'll respond. Homeowners trust a warranty more when they can see how the process works.

A warranty is a promise to keep coming back, so it helps to know who you're promising. Resident Review shows verified businesses how other local companies rated a homeowner, so you can see how that customer treated other trades before you commit to a year of return visits. Learn how contractors rate homeowners.

Photograph the house before your crew touches it

Your strongest warranty tool is ten minutes of documentation at the start. Before you open a wall, pull a unit or tear out a floor, photograph the area and note anything that could later be mistaken for your work: hairline cracks, water stains, corroded fittings, an uneven subfloor, ungrounded outlets.

Show those notes to the homeowner. A line on the work order such as "existing hairline crack in tile at doorway, photographed and reviewed with homeowner before start" heads off a later claim that your crew caused it, and it signals good faith. Most people appreciate hearing about a problem in their house before it turns into a disagreement.

Repeat it at completion. A photo set of the finished work and a short walkthrough where the homeowner confirms they're satisfied give you a baseline if a claim lands months later.

Telling a real callback from warranty abuse

Most warranty calls are honest. A fitting weeps, a seam lifts, a breaker trips because a connection worked loose. Fix those quickly and without argument. A fast, friendly callback often earns more loyalty than the original job did, and it's part of the mutual accountability between contractors and homeowners that keeps the trades working well.

A smaller number of claims need a closer look:

• The problem is in an area you didn't touch, or with a product the customer supplied.
• Someone else has worked on the system since you left.
• The "defect" is a design choice the homeowner approved and now regrets.
• The claim arrives after the term ended, or bundled with a demand to waive a balance.
• Every visit produces a new claim, each for something just outside the last fix.

When a claim looks doubtful, inspect before you decide. Take photos, compare them with your before and after sets and explain your finding by email. If the issue isn't covered, say so politely, cite the exclusion and offer to quote the repair. Use the same tone whether the answer is yes or no.

If a warranty disagreement starts spilling into public reviews or complaints, read about protecting your reputation during a customer dispute before you reply to anything online.

Log every warranty visit on the customer record

Each callback should leave a trace: date, complaint, what you found, whether it was covered and what you did. Over a year or two those entries show which crews, products or job types generate the most callbacks, which feeds straight into training and purchasing. They also show which customers use the warranty fairly and which treat it as an open account.

Knowing that second pattern before you quote a repeat customer's next project, or a new homeowner who has already been through several contractors, lets your office set expectations at the start. Plumbing shops in particular lean on this kind of record, and tracking customer history before dispatch shows what to capture.

Keep warranty history where your office can find it. Log each callback as a note on the customer for future jobs, check whether other local companies saw the same homeowner stretch a warranty past its terms, and confirm the year built before you document pre-existing conditions. Spin up a free trial in a few minutes, and cancel if your office never opens it. Get started free.

Frequently Asked Questions

What is a typical length for a contractor warranty on labor?

There's no single standard. Many businesses match it to the trade and the type of work, offering a longer term on installations and a shorter one on repairs. Find out whether your state licensing board or a local code sets a minimum for your work, and pick a term you can afford to honor.

Does a workmanship warranty transfer to a new owner if the house sells?

Only if you say so. Decide whether coverage follows the property or stays with the original customer, and write that into the warranty. Transferable coverage can be a selling point for homeowners who plan to move.

Can a contractor void a warranty if the homeowner doesn't pay in full?

Some contractors make coverage conditional on full payment and state it in the contract. Whether that condition holds up depends on your state's law and the exact wording, so have an attorney review the clause.

Should the warranty go in the contract or a separate document?

Either works if the homeowner receives it before the job and keeps a copy. Many businesses summarize the warranty in the contract and hand over the full one-page version at completion with the final paperwork.

What if the manufacturer denies a claim on a product I installed?

Give the homeowner the denial details and explain the options, such as a paid repair or replacement. If the manufacturer blames the installation, inspect the work and handle it under your own warranty if the cause is yours.