Convert your current home
Your existing residence becomes the rental property and is assessed under buy-to-let criteria.
- Obtain a rental valuation
- Arrange the BTL remortgage
Let-to-Buy Mortgages
Keep Your Current Home, Rent It Out and Buy Another
A let-to-buy mortgage can help you move home without selling the property you already own. Your current home is converted to a rental property—usually through a buy-to-let remortgage—while a separate residential mortgage is arranged for the home you are moving into.
Let-to-buy is normally a coordinated strategy rather than one mortgage product. The former home must work as a rental investment, while your income and expenditure must support your new main residence. For some homeowners, this reduces dependence on a property chain; it also creates two mortgage commitments, landlord duties and additional tax considerations.
Existing Home to Rental
Your current home is normally remortgaged onto a buy-to-let basis and rented to tenants, with the lender assessing the property value, available equity, expected rental income and whether the proposed mortgage meets its BTL criteria.
Equity for the New Deposit
A suitable BTL remortgage may repay the existing residential loan and release part of the available equity towards your next home, subject to the lender’s maximum LTV, rental assessment and any applicable fees or charges.
Two Affordability Tests
The old home is assessed under buy-to-let rental criteria, while the new residential mortgage is assessed on personal affordability, including how the lender treats the background property and its mortgage commitment.
Your Let-to-Buy Plan
Two linked mortgage applications
Buy your next residence
A separate residential mortgage funds the property that will become your new main home.
- Use equity and savings
- Pass residential affordability
Let-to-buy is usually not one mortgage. It is a sequence in which the existing residential loan is replaced or given appropriate permission for letting, and a second residential application is arranged for the new home.
The two sides must be compatible. The rental property needs to satisfy the buy-to-let lender’s valuation, loan-to-value and rental rules, while the new purchase must pass a separate review of income, expenditure, debts and deposit source. Completion timing can also be linked, so the plan should be built as one transaction rather than two unrelated applications.
Let-to-Buy Mortgage Explained
Property A is your current home. It is remortgaged onto a buy-to-let basis and rented to tenants. Property B is the new home you will occupy and is purchased with a residential mortgage.
Where Property A contains enough usable equity, the BTL remortgage may repay the existing loan and release funds towards the deposit for Property B. This is why the strategy is sometimes described as remortgaging to let and buying a new home, or releasing equity to buy another property.
The correct route depends on how long the property will be rented, whether equity is needed and how the new residential lender treats the existing commitment.
Consent to let
Consent to let allows you to retain the existing residential mortgage while receiving permission to rent out the property. It may suit a temporary move, but permission can be time-limited and may involve fees or rate changes.
Full let-to-buy remortgage
A full let-to-buy remortgage is generally more suitable where the property will be rented for the longer term, equity needs to be released or the new residential lender wants the old home treated as a self-supporting BTL commitment.
Accidental landlord route
Someone becoming a landlord unexpectedly may encounter consumer buy-to-let or accidental landlord criteria. The correct product depends on why the property is being let, the expected duration and the lender’s rules.
Not interested in let to buy mortgage? Find other options that meet your needs.
Explore other buy to let mortgage options!
Standard Buy-to-Let
A standard buy-to-let mortgage is designed for a conventional house or flat rented to residential tenants. We help you understand deposit requirements, rental coverage tests, lender criteria, and the application process.
Holiday Let
A holiday let mortgage is intended for properties rented to short-term guests rather than long-term tenants. We help you explore lenders that consider seasonal income, location, occupancy, and the intended letting arrangement.
Let-to-Buy
Let-to-buy allows you to keep your current home as a rental property while purchasing a new home to live in. We help coordinate both mortgages and review the expected rent, equity, affordability, and timing.
New Build BTL
A new build buy-to-let mortgage can involve specific lender rules around valuation, developer incentives, leasehold terms, and maximum loan-to-value. We help you identify products suited to newly built rental properties.
Limited Company / SPV
A Limited Company SPV buy-to-let mortgage is designed for rental properties purchased through a Special Purpose Vehicle company. We help you understand lender requirements, company structure, director guarantees, rental coverage, and available borrowing options.
HMO
An HMO mortgage is designed for properties rented to multiple tenants who may share facilities such as a kitchen or bathroom. We help you navigate lender criteria, licensing, rental assessment, property configuration, and landlord experience requirements.
MUFB
A MUFB mortgage is used for a Multi-Unit Freehold Block containing two or more self-contained residential units held under one freehold title. We help you assess valuation, rental income, unit configuration, lender criteria, and suitable finance options.
Portfolio Landlord
A portfolio landlord mortgage is relevant where a landlord owns multiple mortgaged buy-to-let properties. We help you understand portfolio assessments, aggregate rental coverage, overall leverage, property schedules, and lender-specific portfolio criteria.
How Much Equity Can You Release?
Usable equity is not simply the property value minus the current mortgage. The proposed BTL loan must also pass the lender’s maximum LTV and rental calculation.
For example, a home worth £350,000 with an existing mortgage of £160,000 might support a BTL loan of £245,000. That could release up to £85,000 before product fees, legal costs and any early repayment charge.
A property can contain substantial equity and still release less than expected where the rent does not support the desired mortgage.
- ILLUSTRATIVE EQUITY SNAPSHOT
Example figures
Before fees and early repayment charges
Current property value
Illustrative market value: £350,000.
Possible BTL mortgage
Illustrative maximum loan: £245,000, subject to rent and criteria.
Potential equity released
After repaying a £160,000 balance, before transaction costs.
Let-to-Buy vs Buy-to-Let
The names are similar because both arrangements use buy-to-let finance, but the starting point and purpose are different. Let-to-buy means turning the home you already occupy into a rental as part of a residential move. Standard buy-to-let normally means buying or refinancing a property primarily as an investment.
Let-to-buy usually combines a BTL remortgage with a separate residential mortgage. Standard BTL commonly centres on one investment transaction. The distinction matters because let-to-buy requires both rental affordability and personal residential affordability to work at the same time.
Quick comparison
Where the two routes differ
Starting point
Let-to-buy begins with your existing main home; standard BTL begins with an investment property.
Main purpose
Let-to-buy supports a home move; standard BTL is primarily an investment decision.
Mortgages involved
Let-to-buy usually needs a BTL remortgage and a residential mortgage.
Use of equity
Released equity may help fund the deposit on your new main residence.
Affordability
Let-to-buy combines rental coverage with personal residential affordability.
Occupation
You move out of the old home and occupy the new residential property.
Timing
Two linked transactions may need coordinated offers, conveyancing and completion.
- In simple terms: let-to-buy uses buy-to-let finance on the home you are leaving. A standard buy-to-let mortgage is normally used for a property held primarily as a rental investment.
Readers comparing the broader rules on investment-property deposits, rental stress tests and landlord ownership structures should also review the PBS Brokers guide to standard buy-to-let mortgages.
Let-to-Buy
Best understood as a moving strategy.
Your current residence becomes the rental, and the released equity may support the next residential purchase.
Standard Buy-to-Let
Best understood as an investment transaction.
The property is bought or refinanced mainly to generate rental income, without necessarily forming part of a home move.
Two Affordability Assessments
1. Rental assessment on the former home
The BTL lender uses the expected market rent, a stress rate and an interest coverage ratio to decide whether the rent supports the proposed mortgage. A larger deposit does not automatically solve weak rental affordability.
2. Residential affordability on the new home
The residential lender reviews income, expenditure, debts, childcare and the treatment of the background property. It may ignore the old mortgage where rent fully covers it, count a shortfall, or include the full commitment.
A let-to-buy calculator can provide a starting estimate, but it cannot reproduce two lenders’ policies, credit scoring and completion requirements.
Let-to-Buy Mortgage Criteria
Income and employment
Lenders review salary, self-employed income, bonuses, pension income and employment stability. The residential lender must be satisfied that the new main-home mortgage remains affordable alongside other commitments.
Credit history
Mortgage conduct, missed payments, defaults, unsecured debts and recent applications can affect both sides of the plan. A problem acceptable to one lender may not fit the other.
Property and tenancy
The former home must meet the BTL lender’s requirements for value, construction, lease length and intended tenancy. HMOs, family occupation, short leases and unusual construction may need specialist products.
Deposit and equity
The lender checks how much equity remains in the rental property, the source of the new-home deposit and whether sufficient funds remain for tax, fees and a landlord reserve.
Documents and timing
Common requirements include a mortgage statement, redemption figure, rental valuation, income evidence, bank statements and details of the new purchase. Some lenders require simultaneous or closely coordinated completion.
Planning a let to buy mortgage?
Check your circumstances, the property and the mortgage together.
Understand your options, compare the true costs and build a mortgage plan around your goals.
How to Get a Let-to-Buy Mortgage
01
Review the existing property
Obtain a current mortgage statement, redemption figure, estimated value and realistic rental assessment. Check any early repayment charge and whether the title, lease and insurance allow letting.
02
Calculate usable equity
Work out the maximum BTL mortgage supported by both LTV and rent. Deduct the existing balance, product fees, legal costs and other transaction expenses.
03
Match both applications
Choose BTL and residential lenders whose affordability treatment, property rules and completion conditions work together. The cheapest isolated product may not create the best overall structure.
04
Coordinate completion
Keep the broker, lenders and conveyancers aligned. The BTL remortgage may need to repay the old loan and release the new-home deposit immediately before or alongside the purchase.
Let-to-Buy Mortgage Rates and Costs
There is no single let-to-buy rate because the structure normally combines a buy-to-let product and a residential product. Many BTL mortgages are interest-only, while the residential mortgage is often arranged on a repayment basis.
The best structure is not always the one with the lowest headline rate. Rental calculations, equity release, background-property treatment and total fees can be more important than a small pricing difference.
Cost checklist
Budget for both transactions
BTL product fee
Arrangement or booking fee on the mortgage for the former home.
Residential product fee
Fee attached to the mortgage on the new main residence.
Two valuations
A rental and security valuation may be needed on the former home, plus the new purchase valuation.
Legal work
Conveyancing for the remortgage and the new residential purchase.
Early repayment charge
A possible charge for leaving the existing residential deal before its end date.
Landlord setup costs
Insurance, safety checks, letting-agent charges and an initial maintenance reserve.
- Compare the whole structure: both mortgage payments, both sets of fees, property tax, expected rent, void periods and the cash reserve needed after completion.
Compare the Whole Structure
A lender offering more equity release may apply a stricter rental calculation. Another may offer a stronger BTL rate but count the old mortgage less favourably during residential affordability. Both loans must work together.
Let-to-Buy Stamp Duty and Tax
If you still own the former home when the new purchase completes, the new property will usually be treated as an additional-property transaction. Higher property-tax rates may therefore apply, depending on whether the purchase is in England, Northern Ireland, Scotland or Wales.
Where the former main residence is sold within the relevant deadline and the conditions are met, a refund may sometimes be available. Keeping it as a long-term rental usually means the additional charge remains part of the transaction cost.
Rental profit can be taxable, and individual landlords are affected by the residential finance-cost restriction. A later sale may also create Capital Gains Tax, although Private Residence Relief can cover qualifying occupation periods.
- Plan tax before making an offer: additional-property tax can materially reduce the deposit and cash reserve available for the transaction. Obtain qualified tax advice for your ownership and future-sale plans.
Becoming a Landlord
Keeping the old home creates responsibilities beyond the mortgage. The exact rules differ across the UK, but the property must be safe, properly insured and managed under the applicable tenancy, deposit, licensing and energy-efficiency requirements.
Safety and compliance
Maintain required gas, electrical and fire-safety standards, provide the relevant certificates and follow local licensing rules.
Tenancy and insurance
Use suitable tenancy documents, protect the deposit correctly and arrange landlord insurance rather than relying on normal home cover.
Maintenance and management
Budget for repairs, replacement items, tenant communication and agent fees where professional management is used.
Vacancies and cash reserve
The mortgage remains payable during empty periods, rent delays and emergency repairs, so a dedicated reserve is important.
The plan should still work after management, maintenance, insurance, tax and periods without rent.
Keep the flexibility. Model the downside.
Benefits and Risks of Let-to-Buy
Let-to-buy can preserve an existing property and reduce chain pressure, but it also concentrates more borrowing and responsibility across two homes.
Keep a property with potential
Retain a home that may have strong rental demand or long-term personal and investment value.
Reduce dependence on a sale
Move without waiting for the former home to sell, which can simplify one part of the property chain.
Two mortgage commitments
You remain responsible for the BTL balance and the residential mortgage, even when the rental property is empty.
Rental and market risk
Lower rent, repairs, rate rises, tax changes or weaker property values can reduce the expected return and flexibility.
PBS Brokers can help assess whether the rent, equity, deposit and residential borrowing work together—not only whether each mortgage can be approved separately.
Let-to-Buy FAQs
Is let-to-buy the same as buy-to-let?
No. Let-to-buy uses BTL finance on the home you are leaving as part of buying a new main residence. Standard buy-to-let is primarily an investment transaction and does not necessarily involve a residential move.
How much equity do I need?
Many cases need enough equity to remain within the lender’s BTL LTV limit, often around 25% or more. The maximum borrowing must also be supported by the expected rent.
Can rental income support the old mortgage?
The BTL lender normally applies an interest coverage ratio and stress rate to the valuer’s expected rent. The residential lender then decides how to treat the background property in its own affordability calculation.
Will I pay higher Stamp Duty?
Usually, where you still own the former home at completion, the new purchase is treated as an additional property. A refund may sometimes be possible if the former main residence is later sold within the relevant rules.
Can I use consent to let instead?
Possibly for a temporary arrangement, subject to the current lender’s permission. A full let-to-buy remortgage may be more appropriate for long-term letting or where equity release is required.
Can I get let-to-buy with credit problems?
Potentially, but both applications need compatible lenders. The type, amount and timing of the credit issue, current mortgage conduct, deposit and property will all affect the available options.
Is Let-to-Buy Right for You?
A viable let-to-buy plan should pass four tests: enough usable equity, rent that supports the BTL borrowing, personal affordability for the new residential mortgage and genuine readiness to become a landlord.
The structure should not depend on perfect occupancy, guaranteed house-price growth or an assumed ability to refinance later. It should remain manageable after fees, tax, maintenance and periods without rent.
Four-part test
When the plan may fit
The arrangement is strongest when both mortgages work on realistic assumptions and sufficient cash remains after completion.
- Enough usable equity
The rental property stays within the lender’s LTV limit after releasing the new-home deposit.
- Rent passes the stress test
The valuer’s achievable rent supports the proposed BTL mortgage under lender criteria.
- The new home is affordable
Your income and expenditure support the residential mortgage after background commitments are considered.
- You are ready to be a landlord
You have time, insurance, compliance arrangements and a reserve for vacancies and repairs.
Warning signs
When to reconsider
A lower contractual payment or a large headline equity figure does not make the structure suitable by itself.
- The rent is too low
Strong equity cannot replace a failed rental affordability assessment.
- The deposit uses every pound
No reserve remains for tax, voids, repairs or unexpected completion costs.
- The plan relies on perfect timing
A delay or down-valuation on one side could prevent the other transaction from completing.
- You do not want landlord duties
Keeping the property creates ongoing legal, financial and practical responsibilities.
Final Thoughts
Let-to-buy can allow you to keep your current home, release equity and buy another property without depending on an immediate sale. It is not simply a way to avoid selling: it creates a rental business, two linked mortgage applications and long-term exposure to two properties.
The strongest plan is the one that still works after realistic rent, mortgage stress tests, tax, fees, maintenance and vacant periods have all been considered.
This information is for general guidance and does not constitute mortgage, legal, investment or tax advice. Mortgage availability depends on individual circumstances, lender criteria, rental affordability and property acceptability.
Let's Find the Right Mortgage for You
Amir Shojaee
Director and Founder of PBSBrokers
CeMAP Qualified Mortgage Adviser
At PBSbrokers, we offer a free initial consultation to review your income, deposit, affordability, credit profile, and mortgage objectives. Whether your case is straightforward or more complex, we'll help you understand the options that may be available and guide you through the next steps.
