Let to Buy mortgage guide: how it works, criteria, costs and risks (2026)
This guide outlines how homeowners can buy a new property while retaining and renting out their current home. Let-to-buy mortgages require managing both a buy-to-let mortgage on the existing property and a residential mortgage for the new home.
Understanding let-to-buy mortgages helps landlords plan strategically, maintain cash flow, and meet lender requirements while balancing both landlord and homeowner responsibilities.
What is a Let to Buy mortgage?
A let to buy mortgage allows homeowners to rent out their current property and purchase a new one to live in. Typically, this involves two separate mortgages: a buy-to-let remortgage on the existing property and a standard residential purchase mortgage on the new home.
This arrangement suits those who want to retain their assets and generate rental income. However, it also makes the borrower both a homeowner and a landlord, requiring careful financial planning.
- Mortgage on current property: converted to buy-to-let
- Mortgage on new property: standard residential
How does a Let to Buy mortgage work?
The let-to-buy process starts by converting your existing mortgage to a buy-to-let arrangement. You then finance the new property with a residential mortgage. Many landlords release equity from their current home to fund the deposit for the new purchase.
Lenders evaluate your equity, projected rental income, and affordability for the new property. You may work with one or two lenders, depending on your situation. This process requires careful coordination and is not as simple as retaining your old mortgage while purchasing another property.
Who is Let to Buy suitable for?
This solution is suitable if:
- You found a new home but don’t want to sell your current property
- You can’t sell the current property at the desired price
- You want to keep your home as an investment
- Job relocation but might return
- Moving in with a partner who already owns property
- Exiting a property chain without urgent sale
Let to Buy vs Buy to Let: what’s the difference?
Many landlords confuse let-to-buy and buy-to-let.
- A let-to-buy mortgage allows you to rent out your current home while purchasing a new residence. In contrast, a buy-to-let mortgage is used solely for investment, with no link to your own residence.
- For let to buy, lenders main focus is the expected rental income, however they typically also want a copy of your onward residential purchase offer as confirmation that you can afford and intend to move out.
Understanding this distinction is essential for effective property planning. Choosing the right option helps you manage cash flow, risk, and long-term portfolio growth.
Let to Buy vs consent to let
Consent to let allows you to rent out your current home temporarily while maintaining a residential mortgage, though it is typically short-term and not always approved by lenders.
In contrast, a Let-to-buy mortgage is designed for long-term rental and purchasing a new home. For landlords seeking to keep their property as an investment while moving, Let-to-buy offers greater flexibility, stability, and better supports long-term portfolio objectives
What are the lending criteria for Let to Buy mortgages
Lenders have specific let-to-buy mortgage criteria. Key requirements for a let-to-buy mortgage include:
- Minimum equity: typically 25%
- Maximum LTV: usually up to 75%
- Good credit history
- Proof of onward purchase if required
- Rental potential of the current property
- Additional personal income may be requested even if rental income covers the mortgage.
Meeting these let-to-buy lending criteria ensures smoother approval, realistic affordability, and financial stability for both residential and rental mortgages.
How much equity or deposit do you need?
Equity in your current home often serves as the down payment for a new purchase. Most lenders require at least 25% equity. For example, if your property is valued at £200,000 and you have a £130,000 mortgage (65% LTV), this may allow an increase in mortgage size to £150,000 (75% LTV) therefore releasing £20,000 in equity to be put towards the purchase costs for the new home.
Knowing how much equity I need for a let-to-buy and understanding the let-to-buy deposit and let to buy ltv helps landlords plan financing accurately and ensures the new mortgage is affordable alongside the rental property.
How do lenders assess rental income?
Lenders do not simply ask for expected rent; they perform a rental stress test. A professional rental valuation is obtained from a letting agent or valuer. Rental income usually needs to cover 125–145% of mortgage payments at a stressed interest rate. This is to account for tax status, void periods, and typical maintenance costs.
A stressed rental income mortgage calculation ensures borrowers can sustain payments under less favourable conditions, providing a realistic assessment of affordability and reducing the risk of arrears.
How do lenders assess affordability for the new residential mortgage?
For the new residential purchase, lenders check affordability by reviewing income, outgoings, debts, and credit profile. Typically the existing mortgage is ignored if the expected rental income fully covers the let-to-buy mortgage that’s being arranged.
Understanding let-to-buy affordability and residential mortgage affordability ensures you can manage both loans. Asking can I afford a let-to-buy allows careful planning and avoids overextending financially.
Step-by-step Let to Buy mortgage process
The let to buy mortgage process guides landlords through refinancing step by step:
- Review equity and mortgage balance
- Check expected rental income
- Speak to a mortgage broker early on to ascertain viability
- Apply for the Let to Buy mortgage on your current home
- Apply for the new residential mortgage
- Valuation, underwriting, and mortgage offer
- Conveyancing, exchange, and completion
Following these steps ensures smooth processing, accurate rental assessment, and proper coordination between residential and buy-to-let mortgages.
What are the advantages of Let to Buy?
The main benefits of a let-to-buy mortgage include:
- No need to sell your current home immediately
- Retain your asset while earning rental income.
- Potential capital growth on the new property
- Flexibility when moving
- Reduces pressure from the property chain
- Useful for couples combining households
These benefits make Let to Buy a flexible option for homeowners seeking to keep their current property while purchasing a new one.
What are the disadvantages and risks of Let to Buy?
While Let to Buy offers benefits, landlords should consider let to buy risks:
- Responsibility for two mortgages
- Void periods where the property is empty
- Maintenance and landlord obligations
- Higher rates on the buy-to-let side
- Fewer lenders and increased complexity
- Potential property price falls
- Tax and compliance obligations
- Cashflow pressure if rental income underperforms
How much stamp duty do you pay on Let to Buy?
For the onwards purchase, stamp duty applies to the new property as an additional home. The standard surcharge is currently 3%, with potential refunds if the original home is sold within 36 months, subject to rules.
Stamp duty on let to buy is separate from remortgaging the existing property. Always check current SDLT rates or consult a professional adviser before completing a transaction.
The Smart City Mortgages experts are happy to tell you more
What other costs should you budget for?
Key let to buy costs include:
- Arrangement fees
- Valuation fees
- Broker fees
- Conveyancing fees
- Landlord insurance
- Letting agent fees
- Maintenance and repairs
- Possible higher monthly payments
- Tax on rental income
How long does a Let to Buy mortgage take?
The let-to-buy mortgage timeline is typically longer than a standard mortgage because two linked applications are involved. Processing depends on lender efficiency, property valuation, documentation completeness, and the conveyancing chain. Brokers can help coordinate both applications. Understanding how long it takes to buy helps landlords plan finances, rental coverage, and moving schedules efficiently.
Can you get a Let to Buy mortgage if you’re self-employed?
It is possible for self-employed landlords to obtain a let-to-buy self employed mortgage, though lenders usually require more evidence of income. Documentation may include SA302s, tax overviews, or company accounts.
Lenders assess rental income and personal earnings to ensure affordability. Understanding self employed let-to-buy mortgage requirements helps landlords prepare applications accurately and improves the likelihood of approval.
Can you get a Let to Buy mortgage with bad credit?
A let-to-buy bad credit mortgage is possible, but fewer lenders are available. Rates and fees may be higher due to perceived risk. Lenders carefully review the severity and recency of credit issues. Specialist lenders or brokers can assist by guiding borrowers through the application process and ensuring all documentation meets lender requirements.
Is Let to Buy a good idea?
Whether let-to-buy is a good idea depends on your financial situation, equity, rental market, and investment goals. Let to Buy is suitable for portfolio growth and flexibility, but may not be beneficial if fees and complexity outweigh potential advantages.
Understanding if let-to-buy is worth it ensures a balanced decision aligned with a long-term property strategy.
Should you apply directly or use a mortgage broker?
Using alet-to-buy mortgage broker can simplify the process and access a wider range of deals. Benefits include:
- Expert guidance on lender requirements and overall viability
- Assistance with documentation and application
- Support for complex scenarios like high LTV or self-employment
- Access to deals not available directly
Common reasons Let to Buy applications get declined
A let to buy mortgage declined application can result from:
- Insufficient equity or deposit
- Rent failing stress test
- Affordability issues for the new mortgage
- Poor credit history
- Incomplete or missing documents
- Property not suitable for letting
- Unstable income
- Lender policy restrictions
Frequently asked questions about Let to Buy mortgages
Can I use equity from my current home as a deposit for a new one?
Yes. Equity can often be used as the deposit for the new property, subject to lender approval and valuation. This can allow applicants to fund the onwards purchase without or with less additional savings.
Do I need two mortgages for Let to Buy?
Typically yes. A buy-to-let mortgage on the current home and a residential mortgage on the new home are required to cover both properties appropriately.
Is Let to Buy better than consent to let?
Let to Buy is generally more suitable for long-term rental and onward purchase. Consent to let is temporary and may not offer the flexibility needed for a new purchase.
Can rental income help me qualify for a new mortgage?
Yes. Lenders usually consider projected rental income when assessing affordability, though stress tests and void periods are taken into account.
Do I pay stamp duty on Let to Buy?
Stamp duty applies to the new property as an additional home. A 3% surcharge is usually applied, with possible refund if the original property is sold within 36 months, subject to current rules.
Can I do Let to Buy if my current home is not yet sold?
Yes, as long as you meet lender criteria for equity, affordability, and rental potential. Planning carefully ensures both mortgages remain manageable.
What happens if I can’t find tenants?
Void periods reduce rental coverage. Lenders often require sufficient personal income to cover mortgage obligations during vacancy, ensuring affordability is maintained. As a worst case scenario, you should be prepared to be able to afford both mortgages from personal income and/or emergency savings.
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