What is on this page is finished buildings, not company profiles. Every one says who built it. Where the cost is public it says the figure and who published it; where it is not, ask the company. We do not estimate. See one you like, ask for one like it.
A builder published price is a contract price the builder chose to make public and the platform does not guarantee it. A declared cost is the estimate an applicant lodged with government and is not a contract price. 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.