Let to Buy Mortgage

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Let to Buy Mortgages Require Coordinated Structuring From the Outset

A let-to-buy mortgage must be structured correctly at the start to avoid delays, onward purchase disruption, affordability shortfalls, or declined applications. This includes coordinating the background residential mortgage (being converted to buy-to-let), projected rental income, the onward residential purchase, and lender sequencing. Let to buy is not a standard re-mortgage or buy-to-let; it is a linked transaction requiring deliberate lender alignment.

Strategic Sequencing of Simultaneous Transactions

Let-to-buy cases often involve two mortgages completing in close proximity: converting the existing home to a buy-to-let and arranging a new residential mortgage. Correct sequencing is critical. Applications must be structured so deposit release, rental calculations, and onward affordability align, ensuring neither mortgage jeopardises the other.

Expert Handling of Rental Stress Testing, Background Treatment, and Equity Release

Let-to-buy lenders vary in how they assess the existing property, either as a background buy-to-let or within an integrated transaction. Stress rates, ICR calculations, and tax assumptions directly impact loan size and residential affordability. Where equity is raised for a deposit, loan-to-value and rental cover must be aligned to avoid over-leveraging. Correct lender selection ensures the structure remains viable across both mortgages.

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Let to buy mortgage rates - April 2026 purchase (new home)

LTV

75%LTV

Product fee

£999 Flat Product Fee

Rate

3.85%

Fixed term

5 years

Let to buy mortgage rates - April 2026 purchase (Buy to Let Re-mortgage)

LTV

75%LTV

Product fee

3%

Rate

3.59%

Fixed term

5 years

PROCESS BREAKDOWN

1

Information gathering and structured advice

The first stage of a let to buy mortgage involves collecting detailed information on your existing property, projected rental income, outstanding mortgage balance, equity position, and onward purchase plans. Your broker will assess both buy to let and residential lender criteria, stress testing requirements, and transaction sequencing before recommending a suitable dual-mortgage structure.

2

Credit approval

Once you confirm you wish to proceed with the recommended let to buy structure, both the buy to let remortgage and onward residential mortgage are submitted to obtain initial lending decisions. No application fees are typically payable at Agreement in Principle stage. Following approval, the case progresses to full underwriting where valuation and lender fees become due.

3

Application, valuation & underwriting

Once the let to buy applications are submitted, each lender will progress through underwriting and arrange a valuation on the existing property and the onward purchase, either upfront or following initial assessment. If both valuations and underwriting checks are satisfactory, formal mortgage offers are issued, allowing the transaction to proceed to the legal stage.

4

Offer and completion

Once valuations and underwriting are approved, formal mortgage offers are issued for both elements of the let to buy. Your solicitor then manages redemption of the existing mortgage and coordinates completion so the re-mortgage and onward purchase complete in the required sequence.

Let to Buy mortgage criteria

Minimum loan

£25,001

Max Loan to Value (LTV) purchase

95%LTV

Max Loan to Value (LTV) re-mortgage

85%LTV

Max term

Up to 40 years, subject to criteria

Rate options

Variable, Base Rate Tracker, 2, 3  or 5 year fixed mortgage options

Adverse credit

Accepted on selective products on a case by case basis

Locations

Available in England, Scotland, Wales and Northern Ireland

Specialist Let to Buy Mortgages

Where the retained property in a let to buy is intended for a specialist rental model or corporate structuring, the re-mortgage must be aligned from outset. We structure re-mortgages to accommodate:

HMO (subject to planning and licensing)

Where multi-occupancy is intended, lender policy must permit HMO use and align with planning position, Article 4 direction, and licensing requirements.

Corporate lets

For company or employer-backed tenancy agreements, we select lenders that accept non-standard AST structures and corporate lease arrangements.

Social housing or supported accommodation

Where leasing to a housing association, local authority, or supported housing provider, lender criteria must allow institutional or long-term lease structures rather than standard private ASTs.

Airbnb and serviced accommodation

Short-term or Airbnb-style letting requires lenders that explicitly permit serviced accommodation, as many mainstream lenders prohibit nightly or rolling occupancy models.

Holiday lets

Where the property will operate as a furnished holiday let, we source lenders underwriting against projected occupancy and seasonal income rather than conventional AST stress testing.

Incorporation into a limited company

Where borrowers wish to transfer the property into a limited company as part of their investment strategy, we advise on limited company buy-to-let remortgage options, lender SPV requirements, and transaction structuring. Tax advice should always be taken separately, but financing must be aligned before incorporation proceeds.

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FREQUENTLY ASKED QUESTIONS AND ANSWERS ON LET TO BUY MORTGAGES

How does a let to buy mortgage work?

A let to buy mortgage works by remortgaging your current home onto a buy to let product, usually releasing equity for a deposit, while simultaneously arranging a new residential mortgage for your next home. The existing property must meet rental stress tests, and both mortgages are underwritten separately. 

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Can I get a let to buy mortgage?

Yes, you can get a let to buy mortgage if your existing property meets buy to let rental stress tests and you qualify for a new residential mortgage on your onward purchase. Lenders assess rental income, loan-to-value, credit history, and residential affordability separately.

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How to get a let to buy mortgage?

To get a let to buy mortgage, you must remortgage your current home onto a buy to let product and apply simultaneously for a new residential mortgage. Lenders require a satisfactory rental valuation, appropriate loan-to-value, and full affordability assessment for the new home.

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Who does let to buy mortgages?

Let to buy mortgages are offered by selected UK buy to let and residential mortgage lenders. Not all lenders permit this structure, as it requires simultaneous underwriting of a buy to let remortgage and a new residential purchase.

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What is let to buy mortgage?

A let to buy mortgage is a financing arrangement allowing a homeowner to retain their current property as a rental investment while purchasing a new main residence. The existing property is placed on a buy to let mortgage, and rental income must meet lender affordability and stress rate requirements.

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How do let to buy mortgages work?

Let to buy mortgages work by remortgaging your current home onto a buy to let basis and using released equity as a deposit for a new residential purchase. The existing property must meet rental stress testing, and both mortgages are underwritten independently.

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What is a let to buy mortgage in the UK?

A let to buy mortgage in the UK is a dual-transaction structure where a homeowner converts their current residence to a buy to let mortgage and purchases a new main home with a residential mortgage. Rental income must satisfy UK lender stress rate requirements.

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What are let to buy mortgages?

Let to buy mortgages are arrangements that allow homeowners to retain their current property as a rental investment while buying a new home to live in. The existing property is placed on a buy to let mortgage, subject to rental stress testing.

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MORE Let to buy mortgage FAQS

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