Two home warranty contracts can both say a repair is covered and still produce very different outcomes. The difference is often one definition, the one that decides what counts as a pre-existing problem, meaning a fault that was already present, or already known, before the contract started. When you compare providers, this definition belongs on the same sheet as the service call fee (the amount you pay each time a technician visits) and the waiting period (the stretch after the contract starts when claims are not yet accepted).
Why the definition matters as much as the price
A low monthly or yearly cost tells you little if the contract excludes the very problem you bought it for. Many contracts treat a problem that existed before the start date differently from a problem that began afterward. If the definition is narrow, an old fault that was never noticed may still be excluded. If it is broad, a fault that was only suspected may be treated as known. Read this definition before you read the list of covered items, because the list means little if the starting condition is excluded.
What to find in the wording
Start with the definitions section, if the contract has one, and search for words such as pre-existing, prior, existing, or known. Then check the details. Does the contract measure from the start date, from the date you bought the plan, or from the date of a home inspection? Does a problem disclosed by a seller count as known? Does a problem found on the first technician visit count as pre-existing, or does it fall under the waiting period? Does the exclusion apply to a whole system, such as heating, or only to the single part that failed? Does a repair made under a previous owner's plan change the answer? Write down each answer in the contract's own words, with the section number beside it.
Questions to ask in writing
Ask each provider the same questions and keep the replies. Ask how it decides whether a problem is pre-existing, and what evidence it accepts, such as a prior inspection report, a service invoice, or your own notes and photographs. Ask whether a home inspection done before the sale is used, and whether you can submit one. Ask what happens when a technician and the homeowner disagree about the age of a fault. Ask whether the answer is given in writing, and by whom. A clear, written reply is more useful than a friendly verbal one, because the written reply is what you can point to later.
How to compare two providers side by side
Build a simple sheet with one row for each question above and one column for each provider. Use the same wording in every column, so that you compare the terms rather than your impressions of the sales conversation. Mark each row with the exact clause that answers it. If a provider cannot point you to a clause, note that gap as well, because an unanswered question is still information. Keep the sheet next to the other terms you are comparing, such as the waiting period and the annual cap (the most the plan will pay in one contract year).
Keep your own record of the home
Whatever the provider's definition, your own record is often what settles a dispute. Keep the seller's disclosure, any home inspection report, and invoices for earlier repairs. Take photographs of major systems when you move in, and keep the notes together in one folder. A homeowner with a clear file can answer a pre-existing question faster than one who has to reconstruct the history from memory.
Where the published figures live
This guide explains how the wording works and does not restate any company's terms or figures. For the published details, read the home warranties with a sample contract you can read before buying page, and compare waiting periods on the home warranty companies sorted by waiting period page. The Methodology: How The Home Coverage Report Scores Companies page explains which pages and rosters were used, so you can check how the figures were gathered.