Let to Buy Explained: Keep Your Home as a Rental and Buy the Next One

Every so often a client asks a question that is really a fork in the road: "We're moving. Should we sell our house, or keep it and rent it out?" Let to buy is the machinery for the second answer, and done for the right reasons on the right numbers, it is how plenty of people acquire their first rental without ever going property shopping. Here is how it actually works, including the two catches the glossy explanations skip.

What is let to buy?

It is buy to let in reverse gear. Instead of buying a property to rent out, you convert the home you already own into the rental, and buy a new home to live in. In practice, two transactions happen together:

1. Your current home is remortgaged onto a buy-to-let basis, sized on the rent it will achieve, and, where the equity allows, you release a lump of capital from it.
2. That released equity becomes the deposit on your new residential mortgage, and you move.

You finish the day owning two properties with two mortgages: landlord of the old address, resident of the new one.

When does it make sense?

The honest cases for it:

• You have meaningful equity in the current home, enough that a 75% loan-to-value buy-to-let mortgage still releases a worthwhile deposit.
• The rent stacks up. The old home must pass a lender's stress test as a rental in its own right, typically rent covering 125% to 145% of the interest at a stressed rate. The mechanics are in our buy-to-let mortgages guide.
• It would let well. A property you happened to live in is not automatically a good rental. Tenant demand on that street, at that rent, for that property type, is the real question.
• The market is slow to sell but fine to let, and you would rather keep the asset than take a soft price.
• You want a foothold kept. Some people simply are not ready to let go of a well-bought house, and as a decade-long holder of well-bought houses, I understand completely.

The two catches the brochures skip

The stamp duty surcharge. Because you still own the old home on the day you complete on the new one, the new purchase attracts the additional-property rates of stamp duty, an extra 5% on top of standard rates in England at the time of writing. On a £300,000 onward purchase that is a £15,000 addition, and it belongs in your sums from the very first conversation, not as a completion-week surprise. (Sell the old home later within the allowed window and a refund of the surcharge can be claimed, but plan on the cost, not the refund.)

You are running a rental now. Two mortgages means two sets of obligations, and the old house comes with everything any rental comes with: tax on the rental profit, landlord insurance, gas and electrical compliance, deposit rules, the post-May tenancy regime, voids, and a boiler with a sense of theatre. Let to buy is not a way to avoid being a landlord; it is a way to become one.

Let to buy versus selling up

The unglamorous comparison, because you deserve it. Selling gives you a bigger deposit, one mortgage, no landlord obligations and a clean break; it costs you the future growth and income of the old house. Let to buy keeps the asset working, adds monthly income and a second engine of long-term growth; it costs you the surcharge, the second mortgage and the responsibilities. Neither answer is universally right. The deciding questions are whether the rent genuinely covers the numbers with room to spare, and whether you want to be a landlord, honestly answered.

Run the old house through our investment calculator exactly as if you were buying it today as a rental. If it would not pass as a purchase, sentiment is doing your maths.

What I would tell you if you were family

Treat the old house as a business decision wearing a familiar face. Price the surcharge in from day one. Stress the rent at today's rates, not the rate you hope for. Keep a buffer for the empty month. And decide upfront who is managing it, because "we'll sort it as we go" is how a good plan becomes a Tuesday-night phone call about a leak.

If the answer is that you want the income and the asset but not the job, that is exactly the gap our lettings and management arm fills, and for maximum certainty the Guaranteed Rent Service pays a fixed rent every month for five years while we carry the rest. And if your situation is the simpler cousin of all this, renting out your current home without buying another, that is consent to let, covered here.

Weighing up keeping your home as a rental? Model it in the calculator or book a free consultation and we will give you the honest answer, even if it is "sell".