It possibly will.  If you have prior defaults or a bankruptcy on your file, your lender may not be as willing to lend to you and won’t be offered the lowest interest rates.  Higher interest rates mean higher repayments, which will affect the size of the mortgage you can afford.  However, if you don’t have major blotches on your record, your credit score is unlikely to play a major role in your borrowing power, as a home loan is considered a safe finance type due to being backed by a significant appreciating asset.