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Let to Buy Mortgages in England: Keep Your Home, Plan for Stamp Duty

October 13, 2026
Let to Buy Mortgages in England: Keep Your Home, Plan for Stamp Duty

IMPORTANT: YOUR HOME MAY BE REPOSSESSED IF YOU DO NOT KEEP UP REPAYMENTS ON YOUR MORTGAGE.

Let-to-buy lets you buy a new main residence while renting out your current home, but you must get your lender's agreement and factor in different lending tests and higher Stamp Duty. Depending on your lender, you will either need consent to let or a switch to a buy-to-let remortgage on your existing property. Both routes bring rental income affordability checks and additional property Stamp Duty costs into your planning from day one.

TL;DR:

  • Consent to let is usually temporary and may have a time limit; long term renting generally calls for a buy to let remortgage.
  • Lenders commonly require projected rent to cover mortgage interest at 125% to 145%, but thresholds and stress rates vary, so ask each lender before applying.
  • From April 1, 2025, additional property Stamp Duty rates range from 5% to 17%; keeping your former home makes the new purchase additional.
  • Landlords cannot deduct mortgage interest in full from rental income; tax relief is restricted to the basic rate, reducing the net return.
  • Get a rental projection and affordability check before making an offer, then coordinate completion to avoid paying for two homes before rent begins.
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Table of Contents

How let-to-buy works in practice

Let-to-buy describes keeping your current home as a rented property while taking out a new mortgage to buy a different main residence. It involves two separate lending decisions happening close together: what happens to your existing mortgage, and what you qualify for on the new purchase.

Most lenders offer one of two routes for the property you are leaving behind:

  • Consent to let: your existing lender gives temporary permission to rent out the property while the mortgage stays on its current residential terms, usually for a limited period.
  • Buy-to-let remortgage: you switch the existing mortgage to a buy-to-let product, which MoneyHelper notes lenders may require once letting becomes a longer-term arrangement rather than a short interim measure.

Consent to let tends to suit homeowners who expect to sell or return within a year or two. A permanent rental plan usually points towards a buy-to-let remortgage, which typically carries different rates and terms from a standard residential deal.

Which route you end up with depends largely on your current lender's policy and how long you intend to let the property.

  1. Check your lender's consent to let policy first. Some lenders refuse consent for certain property types, restrict it to a set number of months, or decline it altogether on specific mortgage products.
  2. Consider a buy-to-let remortgage when letting is long-term. If you plan to keep the property rented for years, or build a small portfolio, a dedicated buy-to-let product is usually the more sustainable fit.
  3. Get specialist input if your income is complex. Professionals, contractors and self-employed applicants often need a lender that can accommodate variable or irregular income, and consent to let mortgage policies vary widely between lenders in ways that are not always publicised.

Lending criteria and affordability checks for let-to-buy

Lenders assessing a buy-to-let or consent to let application focus heavily on the rental income the property can generate, using an Interest Coverage Ratio, or ICR, test. MoneyHelper's guidance on buy-to-let mortgages explains that lenders check rental income against a representative interest rate rather than simply accepting the mortgage payment as the benchmark.

  • Projected rent typically needs to cover mortgage interest at a set percentage threshold, often cited in the 125% to 145% range, though the exact figure is set by each individual lender.
  • Personal income, credit history and employment type still matter, particularly where a lender wants evidence of your ability to cover any rental income shortfall.
  • Deposit and loan-to-value expectations on buy-to-let products are usually higher than for residential mortgages, and lenders will ask for tenancy agreements, proof of income and recent bank statements.

The FCA's mortgage rule review recognises that lenders have scope to consider variable or irregular incomes fairly, which matters if you are a contractor or business owner relying on non-standard earnings evidence. For a deeper breakdown of how ICR calculations work, our guide to rental income mortgage rules covers the mechanics in more detail.

Pro Tip: Ask any lender for their exact ICR threshold and stress rate before applying, since these figures vary between lenders and change over time.

Costs and tax implications in England you must model first

Before committing to let-to-buy, the numbers that change your cash flow deserve as much attention as the mortgage rate itself.

As of 1 April 2025, higher Stamp Duty Land Tax rates apply to additional residential properties, with bands rising from 5% on the first slice through to 17% on the top slice. Finance Act 2025, section 51 sets out these increased rates along with transitional rules for contracts entered into before 31 October 2024. Because your new purchase counts as an additional dwelling while you still own the original property, this cost needs modelling early rather than discovered at completion.

Two homes with SDLT cost attached to the new purchase

Rental income tax adds a further layer. Residential landlords no longer deduct mortgage interest in full from rental income before tax; relief is restricted to the basic rate, which changes the net return calculation compared with how many homeowners first assume rental income works.

Other costs to build into your plan include:

  • Letting agent fees, if you choose not to manage the tenancy yourself.
  • Landlord insurance, which differs from standard home insurance cover.
  • Safety certificates and compliance checks required before letting begins.
  • Potential capital gains tax exposure if you sell the rented property later.

Our partner guide on rental income tax from Kent-based accountants CWA covers the bookkeeping side of reporting rental income to HMRC in more depth.

Step-by-step checklist: arranging let-to-buy

Getting from decision to completion involves a sequence of checks rather than a single application.

  1. Review your current mortgage contract for any letting restrictions and contact your lender early to discuss consent to let or a switch to buy-to-let.
  2. Get a rental projection for your existing property, since this figure drives the ICR calculation on whichever route you take.
  3. Run an affordability search before committing to a new purchase, so you know what both mortgages will realistically allow.
  4. Decide on consent to let or a buy-to-let remortgage, then gather documents including proof of income, a draft tenancy agreement and any required safety certificates.
  5. Sequence your timeline carefully to avoid a period where you are paying for two properties without rental income covering the gap.

Pro Tip: Start the rental projection and affordability search before you make an offer on the new property, not after, since this avoids discovering a shortfall once you're already under contract.

Our how we get you ready to offer page sets out the documentation preparation stage in more detail.

Landlord responsibilities when letting your former home

Once your former main residence becomes a rental property, a set of legal obligations applies regardless of which mortgage route you took.

  • Gas and electrical safety certificates must be in place before a tenancy starts and kept current throughout.
  • An Energy Performance Certificate is required, along with deposit protection through a government-approved scheme.
  • Right-to-rent checks on prospective tenants are a legal requirement before signing a tenancy agreement.
  • Ongoing repairs, tenant communication and annual tax reporting to HMRC continue for as long as the property is let.

Recent housing regulation updates have increased documentary and safety obligations for private landlords, and falling short on compliance can affect both your tenancy's standing and your mortgage lender's view of the arrangement. Our partner resource on live-in landlord responsibilities from specialist insurer Flat Insurance covers the insurance side of these obligations in more detail.

Why work with Haven Mark Advisers for let-to-buy

Let-to-buy involves two interlinked mortgage decisions at once, which is exactly the kind of case that benefits from one adviser holding the full picture rather than two separate conversations with two separate brokers. We provide advice to manage both sides of your case, drawing on access to a broad range of UK lenders and experience working with professionals, contractors and business owners whose income does not fit a standard template.

Haven Mark Advisers

Our services cover buy-to-let mortgage advice, residential purchase mortgages, remortgages, mortgage porting and protection advice, all under transparent, agreed-upfront fees. If you are weighing up consent to let against a buy-to-let remortgage, book a regulated mortgage advice appointment through our buy-to-let page and we will work through both mortgages with you from the first call.

This article is general information, not a substitute for advice from a qualified financial advisor. Consult a qualified financial professional about your own circumstances before acting on anything here.

Why work with Haven Mark Advisers for let-to-buy — overview diagram

FAQ

Can I get a UK buy-to-let mortgage as a non-resident?

Some UK lenders do offer buy-to-let mortgages to non-residents, though availability and criteria vary significantly by lender. An adviser with access to a broad lender panel can identify which lenders currently consider non-resident applicants for your circumstances.

Is it hard to qualify for a mortgage?

Qualifying depends on your income type, credit history, deposit size and the lender's specific criteria, so difficulty varies case by case rather than following a single rule. Applicants with variable or self-employed income sometimes face more documentation requirements, though the FCA's mortgage rule review notes that lenders have scope to consider irregular incomes fairly.

How much do I need to earn to get a mortgage of £100,000 in the UK?

There is no single income figure that applies across all lenders, since affordability depends on income multiples, existing debts, credit history and each lender's own criteria. A mortgage adviser can run an affordability search against current lender criteria to give you a realistic answer for your situation.

What is the 28/36 rule in the UK?

UK lenders typically use income multiples and stress-tested affordability calculations instead, which an adviser can explain against current lender criteria.

Sources

This article provides general information only and does not constitute personalised mortgage advice. Mortgage availability, affordability and lender criteria depend on individual circumstances and may change. Please seek advice tailored to your circumstances before acting on this information.