Pricing warranties and guarantees without losing money
A guarantee is a sales tool, but it has to be priced in, not absorbed.
Add the expected warranty cost to every job
Track callbacks for 12 months as a percentage of revenue. That percentage gets built into every quote going forward. Now warranty work is funded, not free.
Define what the warranty covers, in writing
Verbal warranties are open-ended invitations to lose money. A one-paragraph written warranty with clear inclusions and exclusions is fair to both sides.
Honor it fast when it does come up
When a real warranty issue hits, the shop that fixes it within a week earns a customer for life. The shop that argues earns a one-star review.
Take your version of this question further
This is one operator-tested angle on the question. Your shop, your size, your trade, and your team change the answer. Ask your specific version inside Ask a Shop Owner to get a response grounded in how owners like you actually handled it.