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We've developed a set of mortgage calculators to help you find out how much you could borrow. For our Family Mortgage and Offset Mortgage we have separate calculators that show what the repayments each month would be.


If you have any questions, our friendly team are here to answer your questions. You can call us on 03330 140140.


Mortgage affordability calculator

Use this calculator to find out how much you could borrow with one of our mortgages.

Family mortgage monthly repayment calculator

If you're interested in the Family Mortgage, this calculator will tell you what your monthly repayments would be. 

Offset Mortgage calculator

This calculator will show you the difference between term reduction or payment reduction to your overall mortgage when you offset your savings with our Offset Mortgage.

 Retirement Lifestyle Booster calculator

This calculator will show you what you could receive each month with our Retirement Lifestyle Booster mortgage, and whether you could also receive an initial lump sum.

Family Building Society
Ebbisham House
30 Church Street
Surrey KT17 4NL
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