We are thinking of using some of the equity in our house to build an extension on our house and asking our same lender (Halifax) to do this. We have about £400k equity in our house and would be looking to borrow an additional £60k (ish). I've never done this before so not sure how this works? OUr bank accounts are with them and CCs etc. We have debt of about £5k (with Halifax) which we wanted to clear with this as well - is this something they normally consider?