The average cost of house extension is difficult to pin down, because there are so many specifics to account for. Just know that building a house extension can strain you financially. One of the most popular methods of financing is to take a second mortgage on your home. But before you do that, be sure to see how you can budget your expenses. Planning your financing in addition to the details of
. the extension are crucial. Some ways to finance your house extension can be found here http://www.house-extension.co.uk/finance_insurance/finance_main.ht