Running the Business · Part 5

A warranty policy that protects you: what to promise, for how long, what to exclude, and what a warranty cannot do

Lesson 5 of 9~9 minFree previewCurrent as of September 2026Leer en español

A warranty is a promise you make in writing so that the year-two phone call is answered by the paper instead of by an argument. Written well, it says what is covered (your workmanship, for a stated period), what is not (the customer's own fixture, the drain you cleared but did not replace, damage from pressure you told them to fix), how to make a claim, and that the manufacturer's warranty on the equipment is the manufacturer's. Written badly, "lifetime warranty on all work" is a section 7161 claim you cannot keep. This lesson is the policy and its limits: what a warranty can promise, what it cannot waive, and why the honest version sells more than the inflated one.

What the full lesson covers

  • Warrant your workmanship, in writing, for a stated period (one year on repairs and service work and two on repipes and replacements is a common, defensible structure), and put the statement on the contract's list of incorporated documents (7159(d)(12)).
  • Exclude in plain words: customer-supplied fixtures and materials; conditions you documented and the customer declined to fix (the 105 psi with no regulator); drain clearings (the stoppage returns because of what is in the line, not because of the clearing); pre-existing pipe you did not replace; damage from freezing, misuse, or someone else's work.
  • Pass the manufacturer's warranty through; do not adopt it. "The water heater carries the manufacturer's six-year tank warranty; we register it for you; labor to replace a failed tank is covered by us for the first year."
  • A warranty cannot shorten CSLB's four- and ten-year windows (7091), cannot waive the workmanship standard (7109), cannot disclaim your own negligence or violation of law (Civil Code 1668), and cannot penalize a review (1670.8).
  • "Lifetime" and "guaranteed" without terms are 7161 claims. Say what you mean, for how long, and keep it.

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