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What Is a Buy to Let Mortgage?

Landlords Property Market
Posted in   May 06 , 2025
Let-to-buy-mortgage

Anyone who is a homeowner in the UK considering moving from their house but wants to change their current property to a rental should consider a let-to-buy mortgage. It is a modern way to rent out your existing home whilst purchasing a new one for yourself, and it's become a popular choice for landlords looking to invest in property without selling their homes. 

Understanding Let to Buy Mortgages

A let to buy mortgage is designed for people who want to let out their current home and use the equity in it to help buy a new property to live in. It’s different from a traditional buy to let mortgage, where you purchase a property specifically as a rental investment. With let to buy, you already live in the home, you just change its purpose.

In practical terms, you remortgage your current home using a buy to let mortgage, then use the equity released from that remortgage as the deposit for your new residential home. You will now own two properties: one that you live in and one that you rent out.

Why Consider Let to Buy?

There are many reasons someone might choose a let to buy mortgage. Perhaps the housing market is slow, and selling your property right now wouldn’t give you the price you want. Or maybe you’re moving in with a partner or relocating for work, but you don’t want to lose your current home just yet.

Let to buy gives you flexibility. You can generate rental income from your old property whilst settling into a new one. If you later decide to sell the rental property, you still have that option. Or, you may find you enjoy being a landlord and wish to continue building a property portfolio.

How the Process Works

To begin with, you will need to apply for a buy to let mortgage on your existing home. This replaces your current residential mortgage and allows you to legally rent out the property. You must inform your current mortgage lender of your plans, and it is not legal to let a property under a standard residential mortgage without permission.

Once your let to buy mortgage is approved and completed, you’ll typically release some equity. That money can then be used as a deposit for a residential mortgage on your new home, which your estate agent can carry out. 

Requirements for a Let to Buy Mortgage

Landlords must consider some requirements, such as having enough equity in the existing home to use as a deposit for the new home, which is generally a minimum of 25%. The income generated from the old property must be easily affordable by the lender. Moreover, the credit score, income, and other debts will be checked to ensure you can afford a mortgage even with tenants at your place. Some lenders also ask that the new home be your primary residence and that you have no plans to return to your previous property. 

The Risks to Consider

Let to buy mortgages are flexible, but they come with a responsibility. When you become a landlord, you now need to follow all legal duties, including safety measures, tenancy agreements, and property maintenance. You must also remember when the property will be vacant to calculate rents. Apart from this, there is also a chance that your property gets affected by the interest rate and mortgage rules. When your rental income cannot cover the mortgage, the new home becomes costly, thus adding to your financial burden. 

Tax Implications

The impact is usually on the tax situation because renting the old home will be subject to income tax. You will also be liable for GST when you sell the property on a profit margin, as it is not your primary residence now. 

The stamp duty rate increases when you purchase the new home because you now own multiple properties. So it’s a good idea to have a reliable estate agent like Cribs Estate who fully understands how to manage it from all aspects. 

Is Let to Buy Right for You?

Let to buy mortgages aren’t for everyone, but for the right person, they can be a smart move. If you have strong equity, a solid income, and a clear plan for becoming a landlord, this approach can allow you to move forward without letting go of a valuable asset.

It’s especially useful in situations where selling is difficult or if you think your property’s value may rise in the future. But it does require a good understanding of both the property and rental markets, as well as a realistic view of what being a landlord involves.

How Cribs Estates Can Help You with Let to Buy

At Cribs Estates, we assist homeowners and landlords across London in making the right property decisions, including when considering a let to buy mortgage. Our expert team can guide you through the legal and financial aspects, help you prepare your current home for rental, and even manage the letting process for you.

Whether you’re new to property investment or looking to grow your portfolio, we’ll help you take the next step with confidence. From tenant sourcing and compliance to full property management, we’ll handle the details whilst you focus on your future plans.


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