Depending on the value of your home now and what the value will be once the addition is in place, you may qualify for a "construction loan". Typically, construction loans will lend up to 80% of the completed value on a personal residence. The market for these loans has tightened up in the past year or so, but, I would start by asking the bank where you have your bank accounts. If your bank doesn't work out, other lenders in our area that have done many construction loans are: Tulsa National Bank (ask for TC Blair), Grand Bank (ask for Debbie Wolfard) or Arvest Bank (ask for Ray buamgarten). Typically these types of loans are handled in a separate area as they are reviewed on a case by case basis.