Sources: a builder published price is a contract price the builder chose to make public and the platform does not guarantee it. An owner reported price comes from the owner and the platform has not checked it. A declared cost is the estimate an applicant lodged with government and is not a contract price. The three are measured differently, so they cannot be compared directly. A figure marked "On the builder's website" or "Budget on the builder's website" was read as written from the company's own site and is not a contract price.