Buy-to-let vs. holiday let mortgages: what investors need to know

james73515
Jun 22, 2025
3 min read

What investors need to know about buy-to-let and holiday let mortgages.

If you're considering investing in UK property, choosing the right type of mortgage is more than a formality – it’s essential. Whether you’re letting your property long-term or operating it as a short-term rental on platforms like Airbnb, understanding the difference between buy-to-let and holiday let mortgages can have a huge impact on your financial success and legal compliance (writes Joe Stallard, House and Holiday Home Mortgages).

In this guide, we’ll explain how each mortgage works, how lenders assess affordability, and the risks of choosing the wrong one.

What is a buy-to-let mortgage?

A buy-to-let (BTL) mortgage is designed for investors who want to rent out a property on a long-term basis, usually under an assured short hold tenancy (AST) agreement lasting 6–12 months.

These investments typically focus on:

Stable monthly rental income.
Capital growth over time.
Hands-off, long-term tenants.

With a BTL mortgage, lenders base the amount they’re willing to lend on the projected monthly rental income, not your personal income (though your finances are still reviewed).

What is a holiday let mortgage?

A holiday let mortgage, by contrast, is specifically tailored to short-term rental properties. These are homes typically rented by the night or week to holidaymakers, often via platforms like Airbnb, Booking.com, or through local letting agents.

This type of lending suits hosts who:

Want to operate a furnished holiday let (FHL) business.
Prefer the flexibility of short-term rentals.
Plan to use the property themselves for part of the year.

Many lenders offering holiday let mortgages will allow you to stay in the property yourself, which is not permitted under most BTL products.

Affordability calculations: how much can you borrow?

Lenders take different approaches to affordability depending on the type of mortgage.

Buy-to-let affordability

Lenders base BTL affordability on:

Expected monthly rent.
Product term and interest rate.
Your tax band (basic vs higher rate taxpayer).
Management fees (if applicable).

The more stable the rental income, the more likely you are to qualify for a higher loan amount.

Holiday let affordability

Holiday let affordability is more complex because income is seasonal. To determine how much you can borrow, lenders typically require:

A rental forecast letter from a recognised holiday letting agent.
Projected occupancy rates (number of weeks rented).
Expected rates for low, mid, and high seasons.

Every property is assessed individually. A mortgage broker who specialises in holiday let lending can help you access the best deals based on your forecast.

Key differences between buy-to-let and holiday let mortgages

Feature	Buy-to-let	Holiday let
Rental term	Long-term (6–12 months+)	Short-term (nightly/weekly)
Usage	Tenant only	Owner can use property
Affordability basis	Monthly rent	Seasonal forecast
Popular platforms	Rightmove, Zoopla	Airbnb, Booking.com, letting agents
Income type	Stable, consistent	Variable, seasonal

Risks of using the wrong mortgage type

If you let a property as a holiday home on a BTL mortgage – or vice versa – you could be in breach of your mortgage terms. Consequences can include:

The lender demanding full repayment.
Damage to your credit file.
Allegations of mortgage fraud.

Bottom line? Make sure your mortgage product matches your rental strategy.

Final thoughts

Whether you're aiming for consistent income or seasonal high returns, choosing the right mortgage type – buy-to-let vs. holiday let – is critical. Aligning your loan with your rental strategy helps you stay compliant, maximise borrowing potential, and build a sustainable property business.

Thinking of switching or unsure if you're on the right deal? Contact House and Holiday Home Mortgages today to speak with an expert and make sure your investment is set up for success.