According to NatWest’s Q3 figures, gross loans and advances in the mortgage segment made up half of the group’s lending.
Mortgage balances increased by £1.7bn during the period, the lender said.
Looking at the mortgage book, the majority is owner-occupied at £192bn, with £21bn made up of buy-to-let (BTL) mortgages.
The former is up from £189bn at the end of 2024, while the BTL mortgage level is stable.
NatWest added that around 62% of its loan book were on five-year fixed rates, 29% were on two-year fixed rates and 5% were on tracker deals.
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Around 3% of mortgages were on the standard variable rate (SVR), whereas 1% were on 10-year fixed rates.
The report noted that the number of mortgages in more than three months of arrears was 0.63% in the first half of the year, which is below the industry average of 0.89%.
NatWest added that it was widening its customer proposition, pointing to its partnership with Landbay to support more BTL property investors.
Paul Thwaite, NatWest’s chief executive, said: “NatWest Group delivered another strong performance in the third quarter of 2025, underpinned by healthy levels of customer activity and the continued support we provide to them. This is driving positive momentum across our three businesses, with continued lending growth and deposits remaining stable.
“With our strategic focus on growth, NatWest Group’s impact can be felt right across the economy, as we help people get on the housing ladder, save and invest for the future and grow their businesses – from innovative start-ups and vital mid-market firms to the largest multinationals responsible for critical infrastructure projects. We are also becoming a much simpler bank, with tight control of costs supporting our digital transformation that is enabling us to anticipate and meet the changing needs of customers at pace.
“As a result of our consistent delivery and capital generation, we have upgraded our income and returns guidance for 2025 and are well-placed to support our customers, invest for the future and deliver returns to our shareholders.”
