Primary sources
Licensing registers, business registration databases, court and permit records. When we say a credential is verified, it means we found it in one of these and noted the date.
Secondary sources
Manufacturer certification directories, trade association membership lists, and insurer certificates provided directly by the insurer.
Reported information
Details the business gave us, and third-party data such as Google ratings and review counts. We show these with attribution and the date they were read, and we never blend them into a score of our own.
Editorial research
Our own reading of estimates, warranty documents and public feedback. This is judgement rather than fact, and it is labelled as ours.
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If this page does not answer it, the editorial team will. Corrections are checked against the source before anything changes.