Let-to-Buy Mortgage

A let-to-buy mortgage is designed for homeowners who want to move into a new property while keeping their current home and renting it out. Instead of selling first, you remortgage your existing property so it can be treated as a rental, then use the released equity as part of the deposit (or funding) for your next home.

This can be a practical route when timing matters—such as when you've found your next property but your current home isn't ready to sell, or when you want to retain exposure to a property you already own.

What is a let-to-buy mortgage?

A let-to-buy mortgage typically involves two linked steps:

1. Your current home is remortgaged so it can be let out (often moving from a residential mortgage basis to a buy-to-let style arrangement).
2. You take a residential mortgage on your new home, using the equity released from the first property as part of your funding.

In most let-to-buy arrangements, the plan is built around two linked mortgage elements:

• a residential mortgage for the property you're moving into
• a buy-to-let (or buy-to-let style) mortgage for the property you'll let out

In many scenarios, the rental income from your existing property is used to support the mortgage payments on that property.

How let-to-buy works (the usual process)

While each lender's approach can vary, the overall flow is commonly:

• Step 1: Remortgage your current property into a let-to-buy/buy-to-let basis.
• Step 2: Release equity (subject to valuation and lender terms).
• Step 3: Purchase your new home with a residential mortgage.
• Step 4: Let your existing property to tenants and use rental income towards the ongoing costs.

Because this is a two-property plan, lenders will usually look at affordability and risk across both transactions.

When a let-to-buy mortgage can help

Let-to-buy is often considered where timing and chain pressure make selling first difficult or undesirable. Common reasons include:

• You're in a property chain and your sale timeline is uncertain.
• You want to keep your current home as a long-term asset while you move.
• You have equity in your existing property and want to use it to help fund the next purchase.
• You don't want to accept a lower sale price just to secure a faster move.
• Your current home isn't ready to sell but you've found your next property.

For many borrowers, the attraction is that the rental income from the existing property can help offset the additional monthly outgoings created by taking on a new mortgage.

Benefits of a let-to-buy approach

A well-structured let-to-buy arrangement can offer practical advantages, particularly when timing matters:

• Move without being forced to sell first, which can reduce pressure in a chain.
• Use rental income from the existing property to support the buy-to-let element.
• Keep your current property working for you, potentially maintaining exposure to future capital growth.
• Reduce disruption that can occur when you're dependent on your sale completing before you can purchase.

Let-to-buy vs buy-to-let: what's the difference?

Both routes involve renting a property, but the purpose is different:

• Let-to-buy: you're renting out your current home while you move into a new one. The aim is often to keep the original property as an investment while you transition.
• Buy-to-let: you're typically purchasing a property primarily to rent it out from the outset.

This difference matters because it can affect how lenders assess the plan—particularly around your timeline, rental intent, and the way affordability is evaluated.

Who might consider a let-to-buy mortgage?

A let-to-buy mortgage may be suitable if you:

• Own a property you plan to rent out after moving.
• Want to buy a new main residence before your current home is sold.
• Are looking to use equity from your existing property to help fund the next purchase.
• Can demonstrate that the overall plan is affordable when considering both mortgages.

What lenders typically consider

Exact requirements vary by lender and by individual circumstances, but let-to-buy arrangements commonly depend on factors such as:

For the buy-to-let element (the property you'll rent out)

• Expected rental income and whether it is realistic for the property
• Property value and the resulting loan-to-value (LTV)
• Suitability for letting, including practical considerations that affect the rental outcome

For the residential element (the property you'll live in)

• Your personal affordability, including income and outgoings
• How much you can borrow based on your overall financial position

For the overall plan

• Affordability for the two-mortgage position (your existing property and your new home)
• whether the expected rent meaningfully supports the buy-to-let mortgage payments
• Your credit history and overall financial profile
• how the two mortgage elements are structured and whether they can realistically complete in sync

Because let-to-buy is a structured plan, lenders may also apply conditions around how and when the property is let.

Deposit and borrowing considerations

Let-to-buy borrowing can be influenced by the LTV approach on the buy-to-let element and the affordability assessment on the residential element. In many cases, borrowers use equity from the existing property to support the deposit and costs for the new purchase.

Some borrowers may also structure the plan so that the existing property equity reduces the need for a larger deposit on the new home, depending on how the lender(s) assess the situation.

Why let-to-buy is more complex than it sounds

Let-to-buy isn't a single product with one set of rules. It's usually a two-part transaction, which means:

• there may be two separate sets of lender assessments (one for the rental property, one for the new home)
• lenders may evaluate the rental property and the residential affordability in different ways
• the plan often requires careful timing alignment so both mortgages can complete together

Because of this, a broker-led approach can help ensure the strategy is built around how lenders typically assess rental income, affordability, and overall structure.

Consent to let vs let-to-buy

It's easy to confuse these two terms, but they are not the same.

• Consent to let is usually a permission from your current lender to rent out your home without changing the mortgage type in the way a full remortgage would.
• Let-to-buy generally involves a more formal change: your current property is remortgaged on a basis that supports renting, and you take a new residential mortgage for the property you're moving into.

If your plan is to move and keep the property long term, the let-to-buy route may be the more appropriate structure.

Key considerations before you commit

A let-to-buy mortgage can be a strong strategy, but it helps to understand the moving parts:

• Timeline risk: delays in purchase, remortgage, or letting can affect cashflow. If the chain timing shifts, the overall strategy can become harder to manage—so early coordination is usually important.
• Rental income uncertainty: rental assumptions may not match real-world outcomes.
• Two sets of costs: you'll need to manage mortgage payments and typical landlord responsibilities.
• Property suitability: not every property will be treated the same way by lenders.

Making the plan work smoothly

Let-to-buy works best when it is treated as a coordinated project rather than two separate applications. Practical steps that often help include:

• preparing documentation early for both mortgage elements
• understanding likely underwriting and completion timelines for each part
• ensuring the letting plan is realistic, including practical considerations around getting the property ready to rent
• planning for what happens if one part of the process takes longer than expected

Taking time to model the full cost of the plan—before completion—can reduce surprises.

Alternatives to a let-to-buy strategy

Depending on your goals and circumstances, alternatives may include:

• Selling first and using the proceeds to buy your next home.
• Using cash or equity to reduce borrowing needs (for example, paying off part of the existing mortgage or funding the new purchase with equity).
• Considering whether you could structure two residential mortgages in a way that makes sense for your situation (this depends on lender approach and the reason for needing two residential properties).

If you're only considering short-term renting or a temporary arrangement, consent to let may be more relevant.

Frequently asked questions

Can I get a let-to-buy mortgage with bad credit?

Some borrowers with adverse credit may still be able to find options, but it depends on the nature of the issues and the overall affordability picture. Lenders may consider factors beyond a credit score, such as income stability, equity, and the strength of the rental plan.

Do I need a tenant before applying?

Not always. Many lenders use projected rental income based on market evidence, but some may request additional information about the letting arrangement depending on their process and risk assessment.

Can I use a let-to-buy mortgage if my current home is jointly mortgaged?

In many cases, joint ownership can be workable, but it usually requires careful coordination. Both parties may need to be involved in the remortgage process and meet lender requirements, and the structure of the new purchase may be influenced by your plans.

Will I pay stamp duty on both properties?

Stamp duty treatment depends on your circumstances, including whether you're buying as an additional property and any applicable reliefs or timing conditions. It's important to check the position for your specific facts.

Is let-to-buy the same as moving and renting later?

Let-to-buy is specifically about remortgaging your current home so it can be rented out while you move into a new property. If you're only considering short-term renting or a temporary arrangement, consent to let may be more relevant.

Related resources

For general guidance, you can also refer to:

• MoneyHelper: stamp duty and buying a home (external)
• GOV.UK: Stamp Duty Land Tax (external)