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UK Buy-to-Let Mortgages: Market Trends in 2025

The UK mortgage market saw a substantial increase in gross lending in 2025, with buy-to-let lending surging, impacting landlords and investors.

By David Sampson
1 August 2026
3 min read
UK buy to let mortgage article image for UK Buy-to-Let Mortgages Market Trends in 2025

TL;DR

  • The UK mortgage market saw a substantial increase in gross lending.
  • buy-to-let lending surged, significantly impacting landlords and investors.

Written by David Sampson for Mortgage118. Last updated 1 August 2026. Reviewed against our editorial standards. Editorial standards. Mortgage118 is a directory — not FCA-authorised and not a mortgage adviser.

The UK mortgage market experienced significant changes in 2025, particularly in the buy-to-let sector. With total gross lending reaching a notable figure, the market for landlords and investors is evolving rapidly, driven by both new lending and refinancing activities.

What are the Key Changes in the Mortgage Market?

UK Finance’s annual report highlights a robust recovery in the mortgage sector, with total mortgage balances rising. Notably, Santander emerged as the top performer, with gross lending increasing significantly, while Barclays, NatWest, HSBC, and Nationwide also reported substantial growth. Lloyds, despite being the largest lender by outstanding balances, recorded the slowest growth. This shift in lender rankings indicates a competitive environment where traditional leaders are challenged by emerging players.

How Did Buy-to-Let Lending Perform?

The buy-to-let sector experienced even more pronounced growth, with gross lending increasing significantly. Santander’s buy-to-let lending nearly tripled, propelling it to a higher position among lenders. Other notable performers included NatWest and HSBC, which also grew their buy-to-let lending substantially. Kensington Mortgage Company showed strong performance, increasing its buy-to-let balances as well.

What Does This Mean for Landlords and Investors?

The surge in buy-to-let lending is a positive sign for landlords and investors, indicating increased confidence in the rental market. With major lenders like Santander significantly expanding their buy-to-let offerings, landlords may find more competitive rates and options available. The growth of lenders outside the big six suggests that there is a growing appetite for specialist lending products, which can cater to diverse investment strategies.

However, the slower growth in total mortgage balances highlights a trend of increased refinancing and product switching among existing borrowers. This churn can create opportunities for landlords looking to remortgage and potentially secure better rates. It is essential for investors to stay informed about the changing dynamics in the market to make strategic decisions.

What Should Brokers Watch For?

Brokers should pay close attention to the shifting lender rankings and the performance of emerging players in the buy-to-let sector. The competition among lenders is intensifying, which could lead to more attractive products and rates for borrowers. Additionally, the disparity between lenders’ growth strategies highlights the importance of understanding each lender’s approach to risk and product diversification.

As the market evolves, brokers can use this information to better advise clients on their mortgage options, whether they are first-time landlords or seasoned investors. Keeping an eye on trends in gross lending and lender performance will be important for navigating the market effectively.

Frequently asked questions

What factors contributed to the growth in buy-to-let lending?

The growth in buy-to-let lending can be attributed to increased confidence in the rental market, competitive offerings from lenders, and a rise in refinancing and product switching among existing borrowers.

How can landlords benefit from the current mortgage trends?

Landlords can benefit from competitive rates and more options as lenders expand their buy-to-let offerings. Additionally, opportunities for remortgaging may arise, allowing landlords to secure better financing terms.

About David Sampson

David Sampson writes about the UK mortgage market for Mortgage118, covering specialist lending, market trends, and practical advice for borrowers. All content is reviewed for accuracy against FCA guidelines and current market data.