Answers · UK 2025/26

How much are mortgage repayments on a £800,000 mortgage in the UK?

A £800,000 repayment mortgage at 4.5% over 25 years costs approximately £4,446/month (roughly £1,334,000 total). At 5%, monthly payments rise to about £4,676 (roughly £1,403,000 total). Interest-only at 4.5% costs £3,000/month, but the £800,000 capital is still owed at the end.

Last updated: 10 July 2026Last reviewed: 10 July 2026How we verify

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For a £800,000 capital-and-interest repayment mortgage in the UK over 25 years: at 4.0% around £4,222/month (roughly £1,267,000 total); at 4.5% around £4,446/month (roughly £1,334,000 total); at 5.0% around £4,676/month (roughly £1,403,000 total); at 5.5% around £4,914/month (roughly £1,474,000 total); at 6.0% around £5,155/month (roughly £1,546,000 total). Over 30 years at 4.5%, monthly payments fall to roughly £4,053 but total interest rises further. Interest-only at 4.5% costs £3,000/month, with the full £800,000 capital still owed at the end. Borrowing £800,000 typically requires gross household income of roughly £178,000 to £200,000 under standard income multiples, and lenders will scrutinise affordability closely, including bonus and variable income treatment, existing debt and dependants. Most borrowers at this level use a specialist broker to access private banking or high-net-worth lending panels rather than standard high street products. Use the mortgage calculator to explore rates and terms for large loans.