Home warranties cost $550–$800 a year and deny a meaningful share of claims on pre-existing-condition grounds. Model the expected value across the systems you actually have — and see the honest answer, which for newer homes is often no.
Expected value is the probability-weighted payout minus what you pay. A positive number means the warranty is favorable on average; a negative number means you are paying more in premium than you can reasonably expect back.
| Scenario | Premium | Expected repairs | Expected fees | Net value | Verdict |
|---|---|---|---|---|---|
| 25-yr-old home, 6 systems, $650 | $650 | $1,299 | $95 | +$555 | Worth it |
| 5-yr-old home, 4 systems, $650 | $650 | $647 | $41 | −$44 | Marginal |
| 30-yr home w/ pool, 8 systems, $800 | $800 | $1,900 | $159 | +$941 | Worth it |
| 15-yr home, 2 cheap systems, $550 | $550 | $257 | $18 | −$312 | Not worth it |
The pattern is the whole answer. A warranty is favourable when it covers expensive, failure-prone systems on an older home. It loses money when it covers only cheap appliances, or when the home is new enough that failures are rare. Buying a warranty on a 5-year-old house to cover a dishwasher and some wiring is the classic money-losing case — and it is the one most commonly sold at closing.
A home warranty is a renewable service contract, not an insurance policy, so it is not regulated like one and is not backed by a state guaranty fund. That distinction matters when the provider goes insolvent, which has happened repeatedly in this industry. Insurance regulators do not review the contract language the way they review a homeowners policy.
Most contracts exclude any failure attributable to a condition that existed before coverage began, or to improper maintenance. Because almost every HVAC or plumbing failure has some prior cause, this clause gives the provider broad discretion to deny. Industry complaint data and state attorney general actions put denial rates in the 10–25% range, which is why the calculator exposes the denial rate as an explicit input rather than hiding it.
A $100 service call fee sounds trivial until you learn it is charged per trade, per visit. A single plumbing problem that requires a plumber and then a drywall contractor can be two fees — and the drywall repair is usually excluded entirely. Contracts also commonly cap payouts at $1,500–$3,000 per system and impose annual aggregate caps, so a full HVAC replacement may be only partly covered.
Even an approved claim typically pays for the cheapest compliant repair, not a like-for-like replacement. An aging 80%-efficiency furnace may be patched rather than replaced, and you may be asked to pay the difference for a code-required upgrade. The value delivered is usually below the sticker price of a new unit, which is why this model discounts by the service fee rather than assuming full replacement value.
Take the $650 premium, add it to a dedicated account each year, and after five years you have $3,250 — enough for most single appliance failures and a healthy start on HVAC. You keep the money if nothing breaks, and you choose the contractor. The trade-off is variance: a $4,000 HVAC failure in year one is painful, whereas the warranty smooths it. For most homeowners with cash reserves, the sinking-fund approach wins on expected value; the warranty wins when an unbudgeted four-figure repair would be a genuine hardship.
Older home, expensive systems (HVAC, pool, water heater), you have no emergency fund, or the seller is paying for the first year as a closing concession.
New construction, you are handy and would repair things yourself, systems are already under manufacturer warranty, or you have cash to absorb a repair.
If what failed is your roof rather than a system, that is a property insurance claim, not a warranty claim — see our home insurance cost calculator for how that coverage is priced.
⚠️ Important: This is an expected-value model, not a prediction. Failure probabilities and average repair costs are national approximations for common systems and will differ substantially by climate, equipment age, and maintenance history. The model assumes each covered system can fail at most once per year and pays repair cost minus the service fee; it does not model per-system payout caps, annual aggregate caps, or contractor-quality differences. A warranty is a smoothing product as much as a value product — if a sudden $4,000 repair would be a financial hardship, the warranty may be worth it even when the expected value is negative.