Market Harborough Building Society has increased its maximum buy-to-let loan size to £3m and widened access to lower-priced products across its UK and expat ranges.

The mutual, which focuses on complex cases, said the changes also apply to high net worth borrowers and form part of a broader push to expand access to larger and more flexible lending options.

Among the changes, the lender has lifted its maximum buy-to-let loan size to £3m, increased the availability of 80% loan-to-value borrowing on its lower-rate tier two products, and added more scenarios to that tier.

These now include cases involving non-standard income, complex properties and joint borrower sole proprietor arrangements for all applicants.

The changes are the latest in a series of updates from the society as it looks to build on what it described as strong momentum at the start of 2026.

Iain Smith (pictured), head of mortgage distribution at Market Harborough Building Society, said: “We’ve built real momentum going into 2026, with a series of changes designed to make our mortgage solutions up to £5m even more accessible.

“And we’re not taking our foot off the gas – giving more landlords and individual investors access to lower-priced tier two products, broader 80% LTV availability, and increased choice with a higher maximum loan size.”

Smith added: “We’re passionate about being best for brokers, and that means listening to and acting on broker feedback – the changes we’ve made so far this year are a clear demonstration of this and our commitment to being an easy, supportive and solutions-focused partner for them and their clients.”

For brokers working with landlords on larger or more complex cases, the move gives greater scope on loan size while also broadening the range of applications that may qualify for the lender’s cheaper tier two pricing.