As Jurius says, you have several good answers, but letâ€™s ask a couple more questions to help you out. Is this a presale in a large development, or a single site built home? Is this a large builder or an independent? Has construction begun, how far along?
Part of the issue will depend on when the home is finished. If you are in the final phases of construction and can lock a rate for 30-45 days and be complete, shop for your loan with various sources as best you can. If you are further out, you'll need a pre-approval with a lender to secure your site, but then you'll want to find out if the builder has a below market loan offering you can take advantage of. Some lenders participate with banks and have below market rates and long term locks I, as a lender can't compete with. If this is the case, I generally advise my buyers to go with builderâ€™s financing. Other times I do the loan for very competitive terms. It really depends on all the options you have available.
I hope this helps.