PV Realty Advisors It depends upon the sort of loan that you have. Other factors include how your home has been constructed and how you have the construction loan. Upon building a custom home on the lot that you have purchased or you own, you will get a construction loan to finance the process. Upon taking out the construction loan, the lender will base the amount of the loan on the improved value of the property. The appraiser then makes the use of the information that has been provided by the builder as well as current home values in the area to calculate the worth of your house.