A short-term let is a property rented to guests for days or weeks at a time rather than to a tenant on a longer tenancy. It covers everything from a coastal holiday cottage to a city centre apartment listed on Airbnb, and is typically managed through booking platforms or a specialist letting agent.

On paper, some of these properties perform exceptionally well. Strong occupancy, excellent reviews and gross income well above what the same property would achieve on a standard tenancy.

Yet owners are often surprised when a lender's response is cautious. Borrowing figures lower than expected, fewer products to choose from, or a lender that simply will not consider the property at all.

It seems counterintuitive. If the property is clearly making money, why is the lender uneasy? The answer is that lenders are not only looking at how well the property performs today. They are looking at how dependable that performance is, and what happens if it changes.

Income that moves around

A tenancy produces a fixed monthly rent, set out in a contract. A short-term let produces income that varies by season, by week and sometimes by day.

A coastal property might earn most of its annual income over the summer and very little in winter. A city apartment may depend on business travel, events or tourism trends. Income can be affected by new competition in the area, changes to platform algorithms, a run of poor reviews or broader economic conditions.

From a lender's perspective, that variability is a risk. The mortgage payment may be the same every month, but the income supporting it is not.

Strong past performance is not always what the lender uses

This is where many owners are caught out.

A booking platform dashboard showing impressive revenue is not necessarily what a lender will use to assess affordability. Many lenders base their calculation on a projected income figure provided by the surveyor or a specialist letting agent, often averaging expected rates across high, mid and low seasons. That projection can be more conservative than the property's actual results.

Some lenders will accept a trading history, typically supported by accounts or tax returns, and may give weight to proven income. Others will only consider what the property would achieve on a standard tenancy, which can reduce borrowing significantly.

Lenders also tend to apply higher rental cover requirements to short-term lets than to standard buy-to-let, reflecting the additional costs of running the property and the less predictable income.

The result is that two lenders can look at the same property with the same track record and arrive at very different figures.

The property itself matters

Lenders are always thinking about what happens if they need to sell the property to recover their loan.

A short-term let is often furnished and marketed for a specific purpose. If the location relies heavily on tourism, the pool of buyers for a standard residential home may be smaller than for a comparable property elsewhere.

Certain property types attract extra scrutiny. Many leases on flats prohibit short-term letting outright, and lenders will check. Some properties carry planning conditions restricting how they can be occupied, such as holiday occupancy conditions preventing use as a main residence. Unusual construction, remote locations and properties above commercial premises can also narrow the options.

Regulation is changing

The regulatory environment around short-term letting has been tightening across the UK, and lenders take that into account.

In London, letting a whole home on a short-term basis for more than 90 nights a year generally requires planning permission. Scotland introduced mandatory licensing for short-term lets in 2022. Wales has introduced its own planning use classes for short-term lets, together with higher council tax premiums on second homes in many areas.

In England, a national registration scheme for short-term lets has been confirmed, with the government indicating it will be fully in place during 2027. A dedicated planning use class has also been proposed, and some local authorities already use planning powers to restrict short-term letting in their area.

Tax treatment has changed too. The furnished holiday lettings regime was abolished in April 2025, removing several tax advantages these properties previously enjoyed, including full relief on mortgage interest.

None of this makes short-term letting unviable. But for a lender committing to a loan over many years, a changing framework adds uncertainty, and uncertainty tends to be priced in.

The mortgage has to permit it

One of the most common issues is using a property as a short-term let under a mortgage that does not allow it.

A buy-to-let mortgage usually requires the property to be let on a standard tenancy arrangement. A residential mortgage generally does not permit letting at all without the lender's consent. Operating a short-term let under either, without the right product or permission, may be a breach of the mortgage terms and could also affect insurance cover.

Owners converting a property from a long-term let or their own home should check the position before taking bookings, not after.

It is a business, not just a property

Short-term lets involve more active management than a standard tenancy. Cleaning, changeovers, guest communication, maintenance, compliance and pricing all need handling, whether by the owner or a management company.

Lenders are aware that performance depends heavily on how well the property is run. That is why some prefer to see professional management, relevant experience or an established operating history.

What gives lenders confidence

Lenders are not opposed to short-term lets. Many offer products specifically designed for them. What they want is evidence that the income is sustainable and the risks are understood.

That usually means a clear trading history where available, a realistic income projection, full compliance with licensing, planning and safety requirements, a lease that permits the use where applicable, appropriate insurance and a sensible level of borrowing.

It can also help to show that the property would still work as a standard let if circumstances changed. A property that could comfortably support the mortgage on a long-term tenancy is a far lower risk than one that only works at peak-season rates.

Choosing the right lender

A successful short-term let is a genuine achievement. But success on a booking platform and suitability for a lender are measured differently.

Understanding how each lender assesses income, which property types it accepts and how it views the regulatory picture is often the difference between a disappointing offer and a well-structured mortgage.

The property has not changed. The performance has not changed. What changes the outcome is finding the lender whose criteria recognise both.