Looks like we're going to have an extra 'lump sum' when we move from our one bed to our two bed in a couple of months time. As we have a baby on the way we want to convert the loft into a third bedroom, but unfortunately the extra money is only enough to cover half of the anticipated cost of this. The mortgage company won't give us a penny more. What would you do, save the lump sum somewhere towards a loft conversion at a later date? So far not sure how we would be able to raise the extra (unless we get a loan maybe? Not sure how that works?). Or increase the deposit amount to keep monthly payments down? We're not the most money savvy so advice appreciated.