Glossary · UK
What is Guarantor Mortgage?
A mortgage where a third party, often a family member, agrees to cover repayments if the borrower cannot.
Full Definition
A guarantor mortgage involves a third party, usually a parent or close relative, formally agreeing to be responsible for the mortgage repayments if the borrower is unable to meet them. It can help people who would otherwise struggle to borrow enough, such as first-time buyers with a small deposit or limited income history. The guarantor does not normally own a share of the property, but they take on a real financial and legal obligation, and their own home or savings may be used as security depending on the product. If the borrower defaults, the lender can pursue the guarantor, which means a missed payment can affect the guarantor's finances and credit record as well. Because of these risks, guarantors should take independent legal advice before committing. Related products include joint borrower sole proprietor arrangements and family deposit or springboard mortgages, which work in different ways. Availability, criteria and rates vary by lender, so any terms should be treated as illustrative and checked directly. A guarantor can often be released later once enough equity has built up or the borrower's income has grown.