Free Contractor Warranty Letter Template
A warranty letter is what you hand over at the end of the job. It states what your workmanship covers, for how long, and what it does not cover. Given voluntarily it is a sales asset. Left unwritten it becomes whatever the client assumed.
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What belongs on a warranty letter
- The job address and the date of substantial completion, which is when the clock starts
- The contract or invoice number the warranty attaches to
- The length of the workmanship warranty, stated in plain words
- What you will do about a defect: correct it, at no charge, within the period
- That manufacturer warranties on materials pass through and are separate
- The exclusions, listed rather than buried
- How the client makes a claim and how quickly you respond
A finished workmanship warranty, filled in
The basement conversion from the contractor agreement example, finished and handed over on 18 December 2026. One page, four boxed facts, three short paragraphs and four exclusions. The letter is doing two jobs at once: giving the homeowner something worth keeping, and fixing in writing what the warranty covers before anybody has a reason to disagree about it.
- The letter is dated the day the job was handed over18 December 2026 in the header and 18 December 2026 in DATE OF SUBSTANTIAL COMPLETION, because they are the same moment. A warranty letter written the following spring, when something has already gone wrong, starts an argument about when the clock began instead of ending one.
- DATE OF SUBSTANTIAL COMPLETION is the only date the warranty runs fromNot the date of the contract, not the date of the final payment, not the date the last punch list item was done. It is the completion date out of the agreement example on this site, which is the same job, and putting it in a box on the front of the letter means nobody has to reconstruct it from invoices a year later.
- CONTRACT OR INVOICE NUMBER ties the warranty to one jobAgreement HB-2026-058. Without it this is a letter from a builder to a homeowner saying they warrant their workmanship, which on a property where you have done three jobs covers all three. The reference is what makes the scope of the promise the scope of one contract.
- It warrants workmanship, and the next paragraph says what it does notMaterials and equipment carry the manufacturer's own warranty, it passes through to the homeowner, and we will help make a claim under it. That is the honest division. A contractor who warrants the materials as well has taken on a failure he cannot control, cannot inspect and did not price, and the first failed cartridge in a shower valve is the one that teaches him.
- Four exclusions, and each one names something checkableNormal wear and settlement within accepted tolerances. Misuse, neglect, alteration or work by somebody else afterwards. Flood, storm, fire and earth movement. Pre existing conditions in parts of the property nobody worked on. A list like that survives being read out loud. A general exclusion for anything not caused by the contractor excludes nothing, because that is the only question in dispute.
- The last line gives something back, deliberatelyThis letter does not remove any right you have under state law. It is there because in many states it is simply true, and a warranty that reads as an attempt to sign away the homeowner's statutory rights gets the whole letter treated as a trick. One sentence costs nothing and makes the other twelve believable.
- Signed by a person, with a titleThe block on page two takes a signature, a date, a printed name and a title. A warranty from a company with nobody's name under it is a warranty the next owner of the house cannot follow up, and the person who signs is saying which human at the company stands behind it.
This is a template and a worked illustration, not legal advice. Many states impose an implied warranty on residential construction whether or not anybody wrote one, set their own limitation periods, and regulate what a written warranty is allowed to exclude. A letter cannot shorten those, and one that tries reads badly in front of a judge. Write this one, then check what your state already obliges you to.
One year is the common workmanship period, and it is yours to set
One year on workmanship from substantial completion is the most common term in residential contracting and is what the contract template on this site uses. Roofers often warrant labor for longer, and some trades warrant specific items separately.
Whatever you choose, put the same period in the contract and in this letter. A contract saying one year and a letter saying two is a gift to the other side.
Give the letter before they ask for it
Handing over a warranty letter with the final invoice does two things. It closes the job formally, and it makes a callback a defined process instead of a phone call at seven in the evening.
It is also the document a client forwards to a neighbor who is thinking about the same work.
Exclusions are not the same as excuses
Write exclusions that a reasonable person would accept before anything goes wrong: wear, neglect, alteration by others, acts of nature. Those read as fair.
Sweeping exclusions that would swallow the warranty read as a warning, and in several states parts of them are unenforceable against a homeowner anyway.
Questions people ask
How long should a contractor warranty last?
One year on workmanship is the common residential baseline, with manufacturer warranties on materials running separately and often much longer. Some trades and some states set different expectations, and structural work is frequently longer.
Is a written warranty required?
Usually not, but many states imply a warranty of workmanlike construction whether or not you write one. Writing it lets you define the period and the exclusions instead of leaving both to a court.
Does a warranty letter replace the manufacturer warranty?
No. Material warranties belong to the manufacturer and pass through to the owner. Your letter covers the work of installing them.
Can I use this after the job is already finished?
Yes. Date it from substantial completion rather than from today, and reference the invoice so it is clearly tied to that job.