This is exactly what I do. I specialize in Building and renovation financing, as well as helping you to find a great builder/contractor to work with.
Please check out my website. Not that the FHA 203k is the loan for you, but it will give you and idea of how the process works. I have an office in DC and would be glad to meet you sometime when you get back. Do you have a contract on the house yet? Is it an empty lot or existing house?
Well, you came to the right place! Just click on "Buy" along the top bar, and then click on "sold homes" and do a search of homes that have sold in your zip with the same number of bedrooms and baths and any other search information they have available for you to include. Most realtors will also do what is called a "Comparative Market Analysis", even if you're not planning on selling, a agent may do it as a courtesy for future referrals. If you want an accurate value for other reasons, you can consider paying an appraiser who will do a far more individualized report. These can be expensive and are usually done for estate and divorce cases, Best, Terry Bell, Realtor, Santa Rosa, CA... more