Cover Labor, Parts, or Both on Your Warranty: Decision Tree
Why this matters
Every job you warranty makes you choose, explicitly or by default, whether your promise covers the labor, the parts, or both. Default to "both, forever" and you have pre-sold your margin. Default to "neither" and you have no warranty worth naming. The right answer is not one policy for all work; it depends on who supplied the parts, how big the ticket is, and whose defect you are actually standing behind. This tree gets you to a coverage decision you can afford and defend, per job type, before you write it on the invoice.
Start here: who supplied the part
The first fork decides most of the answer.
- If you supplied the part, its own manufacturer warranty covers the part; your job is to decide the labor promise on top of it. Go to the labor question.
- If the customer supplied the part, you cannot warranty a part you did not source and cannot vouch for. Warranty your labor only, and say so in writing before you install it. A customer-supplied part that fails is not your parts claim. See related: Customer-Supplied Part - Install vs Decline vs Disclaim Decision Tree.
The labor question: is this workmanship you stand behind
Labor coverage is about your work, so scope it to your work.
- If it is your installation or repair, cover the labor to fix a defect in it for a bounded window. This is the core workmanship promise customers expect and you should honor.
- If the labor is to install a manufacturer's warranty part after your labor window has closed, that is billable labor even though the part is free. Do not extend free labor by reflex; name the charge.
- If the failure is from misuse, wear, or another party's work, neither labor nor parts is yours to cover. Quote it as paid work.
The both question: when full coverage is the right call
Covering both labor and parts on your own dime is sometimes exactly right, but choose it on purpose:
- A full installation you performed, inside the workmanship window: cover both. A defect in a job you just did is yours end to end.
- A big-ticket install where warranty is the selling point: covering both for a defined period can be a deliberate, priced differentiator, not a giveaway, as long as you built the expected cost into the quote.
- A small repair with a customer-supplied part: cover neither the part nor an extended labor promise; a short workmanship guarantee on your labor only is enough.
Comparison: pick the coverage to match the job
| Situation | Parts | Labor | Why |
|---|---|---|---|
| Your install, inside workmanship window | Pass through maker's warranty | Cover | The whole job is yours to stand behind |
| Your install, part fails after labor window | Free part via maker | Bill labor | Your labor promise expired; the maker's has not |
| Customer-supplied part | Not covered by you | Cover your labor only | You cannot warranty a part you did not source |
| Wear item or consumable | Not covered | Not covered | Replacement is maintenance, not a defect |
| Misuse or third-party cause | Not covered | Not covered | The failure is outside your work |
| Big-ticket install, warranty as differentiator | Pass through, help claim | Cover, priced into quote | A deliberate selling point you funded up front |
When to pick which
The pattern across the table: parts coverage is almost always a pass-through, not a cost you absorb, so passing it through is cheap and generous at once. Labor is your real cost, so cover it where the work is genuinely yours and inside your window, bill it where your window has closed or the failure is not yours, and only extend it as a priced product on the jobs where warranty wins the sale. Decide before the invoice, write which coverage applies, and you never have to improvise the answer on a callback. See related: Splitting Labor and Parts in Your Warranty Terms.
Quick recap
- Who supplied the part? Customer-supplied means labor-only, disclaimed in writing.
- Is the labor for a defect in your own work, inside your window? Then cover it.
- Is the labor to fit a free warranty part after your window closed? Bill it.
- Misuse, wear, or another party? Cover neither.
- Big-ticket install where warranty sells the job? Cover both, but price it in.
References
- U.S. Federal Trade Commission (FTC) guidance on consumer product warranties (Magnuson-Moss Warranty Act concepts)
- Manufacturer warranty documentation on parts coverage and labor allowances
- Trade-standard practice for workmanship-warranty scope by job type
- See related: Splitting Labor and Parts in Your Warranty Terms; The Difference Between a Parts Warranty and a Labor Warranty in Practice