Complex buy to let: unpacking myths

In my conversations with brokers, complex buy to let comes up with increasing frequency, and often with a degree of frustration. Not because the cases themselves are unworkable, but because outdated assumptions still creep into discussions around affordability and suitability. 

Experienced brokers know this market is rarely black and white. Yet even now, certain myths persist that can limit options or slow down progress. It’s worth challenging a few of the most common ones. 

Myth one: complex buy to let cases are harder to place 

The first assumption is that anything outside a straightforward single‑let automatically becomes harder to place.  

Multi‑lets, regulated lets, or properties with unconventional usage often appear “non‑standard” only when viewed through rigid criteria. Many landlords operating in these areas are highly experienced, with well‑understood income streams and clear long‑term strategies. In practice, a fully let multi‑unit property with diversified tenant income can offer a stable and predictable model. 

The issue is rarely the case itself, but whether underwriting frameworks and lending policy is flexible enough to reflect that reality. Where approaches allow brokers to present the full financial picture, for example through the absence of minimum ICR requirements or the ability to consider top slicing, affordability can be assessed more accurately. This leads to clearer outcomes and smoother progression for brokers and borrowers alike. 

Myth two: regulated buy to let is a niche exception 

Regulated buy to let is still sometimes treated as an edge case, when in reality it has become a familiar feature of today’s market. Family lets, long‑term support arrangements, and inherited properties with dependent occupiers are increasingly common, particularly as housing needs evolve. For instance, the private rented sector continued to account for 19% of UK households in 2025, equivalent to around 4.7 million homesⁱ. 

For brokers, these cases are rarely about stretching criteria. They’re about ensuring the borrowing structure aligns with the occupancy reality and the borrower’s obligations. Regulated buy to let doesn’t fundamentally change the nature of the investment, it changes how responsibility and suitability are assessed. 

The challenge arises when regulated scenarios are automatically diverted into residential solutions that don’t quite fit. Having access to regulated buy to let options, including for complex properties and non‑owner occupiers, allows brokers to place cases accurately rather than compromise on structure for the sake of category labels. 

Myth three: age remains a key consideration  

In some cases, age still features heavily in how risk is assessed in buy to let, despite years of discussion. Yet many complex buy to let cases involve older landlords precisely because they are further along in their investment journey. The median UK landlord age is now 59, with the majority aged 55+ⁱⁱ. 

These borrowers often hold seasoned property assets, with lower leverage and established rental income. In many cases, sustainability is supported more by asset position and income certainty than by earned income alone. Blanket age limits can therefore exclude borrowers who are well placed to sustain lending, particularly where borrowing requirements are modest and well structured. 

The more meaningful consideration is not age in isolation, but how the loan is intended to be supported over time. Where lenders focus on exit strategy, affordability resilience and overall sustainability, rather than applying age as a blunt filter, brokers are better equipped to find workable solutions. 

A more realistic view of complexity 

Complex buy to let has grown because property investment itself has become more varied. Changes in regulation, taxation, family structures and tenant demand have all shaped how properties are used and financed.  

For brokers, success in this space hinges on challenging assumptions and working with lenders who understand that complexity requires judgement, not avoidance. When underwriting frameworks adapt to borrower reality, for example through flexible affordability, regulated solutions and sensible views on age, complex buy to let becomes less about exception handling and more about good lending practice. 

The opportunity for brokers lies in cutting through the myths, structuring cases with confidence and partnering with lenders who are willing to look beyond the obvious. Complexity, handled well, is not a barrier - it’s simply part of the modern buy to let landscape. 

Find out how Market Harborough can support your buy to let clients at www.mhbs.co.uk

_{Sources:
i www.ons.gov.uk/peoplepopulationandcommunity/housing/articles/privaterentedsectorstatisticsfromacrosstheuk/2025
ii natcen.ac.uk/publications/english-private-landlord-survey}

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