Get the lender involved if the builder does not give you a budget/cost breakdown. If a builder learns the appraisal is stalled and loan won;t close , they hand it over in a hurry. I am more interested in the overall budget then what a countertop cost. Though the materials used for major features are an indication of quality -
The builder budget is great because it is what it is , not our job to prove it right or wrong. However, if their budget varies wildly from our cost approach ( if we do one ), it can be pointed out. A cost approach done by an appraiser is, in most cases, not expected to be used for actual building detail; it is done for valuation purposes as a check and balance on a builder's budget and to extract a land estimate value.
Having a builder budget/cost approach can indicate if the subject is equivalent quality to other homes of its type, age, and location, or if it is an under-improvement or super adequacy.
"Builder budget estimate for total dwelling, $1,200,000. Appraiser cost approach estimate is $1,100, 000. The appraiser cost approach is an estimate based on a national cost table and local profit norms, done for valuation purposes only. An actual builder cost can vary per individual contractor."."
Builders or contractors will give different estimates even for same size and materials house. Because they can use different sources, pay their crew differently, and apply different profit add-ons.