Complex Buy to Let: Why Specialist Lending Matters More in 2026

The buy to let market continues to change and advisers are increasingly dealing with landlord clients whose portfolios include a wider range of property types and structures than in the past. Landlords are adjusting their investment strategies to maintain strong yields, respond to tenant demand and manage regulatory pressures, and that often leads them towards property types that require a more specialist lending approach.

For advisers, this means a growing number of cases that involve properties such as HMOs, multi-unit freehold blocks (MUFBs), holiday lets or short-term lets. These properties can offer strong opportunities for experienced landlords but they also require lenders who understand the nuances of how they operate, how income should be assessed and how cases should be structured.

In 2026, having access to lenders with the expertise, criteria and service model to handle these scenarios is essential for advisers who want to support landlord clients effectively.

Understanding the breadth of complex buy to let

One of the challenges advisers face when placing complex buy to let cases is that the category covers a wide range of property types and borrower circumstances. It is not a single type of property or landlord profile, but a collection of situations where a standard buy to let approach may not be appropriate.

At Foundation, we support brokers and their landlord clients across the full spectrum of complex buy to let property types. That includes HMOs, MUFBs, holiday lets, short-term lets and properties that fall within our Property Plus range.

Each of these scenarios brings its own considerations around property use, tenant profile, income stream and ownership structure. A holiday let or short-term let, for example, will have a very different income profile to a standard AST property, while an HMO or MUFB will often require a deeper understanding of management arrangements and rental configuration.

This is why breadth of product and criteria is so important. Brokers need lenders who are comfortable working across multiple property types and have solutions designed specifically for these scenarios rather than trying to adapt standard products.

The importance of reliable service

Placing complex buy to let cases often requires a closer working relationship between broker, lender and underwriter. These cases can involve multiple moving parts, from portfolio structures to income calculations, and means brokers need lenders who can offer clear communication and consistent decision making.

A reliable service model helps brokers move cases forward with confidence because they know how a lender approaches complex scenarios and what information will be required to support the application. Access to experienced underwriters and relationship-led support can make a significant difference in helping advisers place cases that might otherwise struggle to find a home.

For landlord clients, that reliability also brings reassurance. Many of these investors are operating property portfolios as part of a long-term strategy, so they want to work with brokers and lenders who understand how their investments are structured and how their borrowing fits within that broader plan.

Flexibility and experience in complex cases

Complex buy to let lending requires lenders to look beyond a simple checklist approach. Cases often need to be assessed in context, taking into account the landlord’s experience, the structure of the portfolio and the specific characteristics of the property itself.

This is where manual underwriting and specialist expertise become particularly valuable. When lenders are prepared to assess cases on their own merits and work with brokers to structure the application properly, it opens the door to solutions that support both responsible lending and the landlord’s investment objectives.

Foundation’s approach to complex buy to let lending is built around breadth of product, reliability of service and flexibility in underwriting, with the aim of helping brokers bring forward cases with confidence and secure the right outcomes for their landlord clients.

Helping advisers support their landlord clients

As landlord portfolios continue to evolve, brokers will increasingly encounter cases that involve specialist property types or more structured borrowing arrangements.

Having access to lenders who understand these scenarios and have the experience to handle them properly can make a significant difference. It allows brokers to focus on supporting their landlord clients’ investment strategies, knowing they have a specialist lending partner who can help turn complex cases into successful outcomes.