The short answer
UK Finance publishes the authoritative annual ranking by gross lending and outstanding mortgage balances. Its latest table covers 2025. Large names commonly encountered by residential borrowers include groups and brands such as Lloyds Banking Group (including Halifax), Nationwide Building Society, NatWest Group, Santander UK, Barclays and HSBC UK. Building societies and specialist lenders also serve important cases. This is market context, not a recommended shortlist.
Why “most popular” is the wrong test
A lender may be large because of its existing mortgage book, distribution through brokers, pricing in a past year or multiple brands. None of those facts tells you whether it will accept your income, deposit, property or credit profile today. Approval volumes are not customer-satisfaction scores, and neither measure proves value.
Brands and banking groups are not always the same thing
Consumers apply through brands, while market tables may combine lending under a parent group. A group can operate different brands with separate product ranges or routes to market. When comparing, record the actual lender and product—not only the familiar logo.
What varies between lenders
- income treatment, affordability models and maximum terms;
- acceptable property types, construction, tenure and lease conditions;
- deposit and loan-to-value bands;
- treatment of self-employment, bonuses, overtime and other income;
- credit-history policy and document requirements;
- rates, fees, incentives, early repayment charges and overpayment rules;
- direct-only, broker-only and existing-customer products;
- service times, valuation approach and application process.
How to make the comparison useful
First establish eligibility; then compare total cost over the same period. Include fees and incentives, test a higher future payment, and read restrictions. A regulated adviser can be useful where the case is complex, but ask how broad their lender panel is and whether direct-only deals are excluded. Read our mortgage comparison guide before using market-share data.
Where the current ranking comes from
UK Finance’s largest mortgage lenders page provides its 2025 tables for total-market and buy-to-let lending. We link to the current source rather than copying a league table that will date and whose publication terms restrict redistribution. For authorisation details, use the FCA Register.
Editorial independence and limitations
No lender paid to appear here and the order of names is not a ranking. We do not publish live “best buy” rates without a licensed, timestamped market feed. Products, criteria and service levels can change without notice. Send corrections to hello@propertiesandhomes.co.uk.
Reviewed by the Properties & Homes editorial team
Published and last reviewed: 14 August 2026.
Data reference: UK Finance 2025 largest-lenders tables, published 30 July 2026.
Change log: first edition.