Isn't the value assigned by surveyors for insurance purposes rather than sales pricing?
Depends on purpose of survey. If survey for purchase, then should be sales pricing. If for insurance, then insurance value. However, they should be the same so makes no difference. The problem is that surveyors may or may not be knowledgeable enough to give good pricing. They are surveyors, not appraisers. Surveyors don't give values on homes. Appraisers do.