K.C.
We took out a bridge loan, then rolled it over into a primary mortgage once the construction was completed. It was a $300,000 project, but the home's value went up way more than that after completion, so we were able to refinance a new first mortgage. It was really great getting the bank involved because they helped keep the contractors honest: if there wasn't proof of work done, they didn't get paid. Made the whole process smooth for us.
We're in a different house now and about to start another $200,000 remodel (we like buying crappy houses and fixing them up, can you tell?). This time, we've got the money in cash, but I think we'll still take out some sort of loan which we can pay off when it's all done. It's nice to have that third party sort of keeping the contractors in line.