Tax issues when transferring personal home to LLC then selling

I am a small spec home builder. I build under 3-10 houses per year. My bank will lend me to my personal name enough money to build a large spec home at a much lower interest rate than my HML. I want to know what would happen if I built the house, then transferred it (along with the mortgage) to my LLC name and then sold it. I asked my bank if they would care and they flat out told me they have no rules for how long I have to own it. So despite the fact this seems dishonest at the surface, I don't believe it's breaking any rules.