I am in the insurance business. Depending on the state and carriers, some may write as a homeowner's with builders risk endorsement attached. Basically, after 1 year, the builder's risk endorsement falls off. Call and independent agent, a larger one, if necessary and inquire about options. Vacant express will probably write, if it is available to your agent, but the premium will be much higher than a homeowner's product with builders risk endorsement.