Not sure, but those who offer mortgages may also offer construction loans. Take a look at the Finance > Home Buying section of my website below and call them to ask.

When I had my home built, after the bids were in, but before I chose the winner, I asked my contractor who eventually won the bid if he would allow me to buy his construction materials from his providers, charging them on my credit cards, then deducting their cost from his bill. He was hungry, so he agreed. Several hundred thousand miles resulted.