Buying a house before selling your current one is possible if you can fund the purchase before your sale completes. You could use savings, keep two mortgages, use let to buy or consider a short term bridging loan.
How does buying a house before selling your current one work?
Buying a new house before selling your old one creates a cash timing problem. You need available money to complete the purchase, not just value held in your current home.
This is only an illustration. You hope to sell your current home for £300,000 and want to buy a home priced at £400,000.
You cannot fund the purchase just by covering the difference between those prices. You still need money for the full purchase, and must allow for any mortgage you owe on your current home.
If the old home instead sells for £280,000, you receive less to clear your borrowing. Test that outcome before committing, alongside tax, legal costs and other moving expenses.
Ask your estate agent for evidence from recent local sales. Use that when setting the expected sale price, rather than relying on the amount you need for the move.
Enter the purchase price, buying costs including tax, and cash available before your sale completes. Use the Sale plan calculator separately to test a lower selling price, including all secured debts in the repayment figure.
Treat results from the calculators as planning estimates. A property valuation and the lender's checks may produce different figures.
Should I wait or sell first and rent?
Waiting means keeping your purchase dependent on your sale. Ask the estate agents whether the seller can accept that and what would happen if your buyer withdrew.
A price reduction may make more sense than extra borrowing if it produces an acceptable sale. Weigh the money you would give up against the cost of owning both homes.
Selling first and renting puts the sale proceeds in your hands before you buy. You repay the current mortgage from the sale, subject to the terms of that loan.
You may need storage and two removals. Check the tenancy terms and how you would manage a purchase that completes before you can leave the rental.
You could lose the house you first wanted while waiting or renting. Consider other options to bridging loans before committing.
Can I pay two mortgages at once?
You may be able to take a mortgage on the new home while keeping the current mortgage. You need funds for the deposit and purchase costs without relying on your sale.
The lender assesses your income, spending, debts and existing mortgage commitments. It may count the current payment even though you intend to sell.
Check your own budget too. Include both mortgage payments, insurance, utilities, repairs and local property bills, including any extra charges for an empty home.
Your current mortgage continues until you repay it or agree a change with the lender. Moving out does not stop the payments or remove the lender's rights over that property.
Can I port my mortgage and borrow more?
Porting means applying to keep an existing mortgage deal when you move. It still needs a new application, a suitable property and the lender's affordability checks.
See MoneyHelper's explanation of porting for how the existing deal and extra borrowing are treated.
You normally repay the mortgage on the old home and take out a new loan on the next one. Extra borrowing can have different terms from the part you port.
Porting does not let you use the same mortgage on both homes at once. Buying before selling needs the lender to agree how the old mortgage will be repaid.
Ask what happens if the purchase and sale complete separately. Early repayment charges may apply, and any later refund depends on the lender's rules.
Could I let my current home and buy another?
Let to buy means keeping your old home to rent out while buying a new home to live in. You may refinance the old home onto a buy-to-let mortgage.
That may release equity for the next purchase, but the lender must accept the property, rental prospects and borrowing. Equity is the value left after secured debts.
Another possibility is consent to let from your current mortgage lender. Ask before taking a tenant.
MoneyHelper explains the mortgage permissions you may need before renting out your home.
You need a realistic rental assessment, landlord insurance and money for repairs, tax and periods without rent. The lender decides how much rental income it will accept.
Tenants have legal rights, which differ across the UK. Letting can affect when you can sell without a tenant in place, so check with a solicitor before relying on a later sale.
Could a bridging loan fund the purchase?
A bridging loan is short term borrowing secured against property. You may use it to fund a purchase while waiting for your current home to sell.
A bridging specialist can explain the borrowing and give you a quote. The lender decides whether to lend after checking the property, your circumstances and how you expect to repay.
Repayment usually depends on a sale or a new mortgage. That plan is called the exit strategy. It needs evidence that the expected money can clear the debt and costs.
Some loans defer interest until repayment. You still owe it.
Ask a bridging specialist for the full cost of borrowing, including lender charges, valuation and legal costs. Check what you must pay before completion.
The current mortgage may stay in place or need repaying as part of the borrowing. Ask which homes the lender wants as security and whether your current lender must consent.
Read about using a bridging loan to buy a house and planning repayment before making commitments.
What must the lender know about my sale?
A lender considering a sale as the repayment plan may ask for the estate agent's details, marketing history, price evidence and the buyer's position.
A home with no buyer presents a different repayment risk from a legally binding sale. An accepted offer alone does not put the sale money in your account.
Does the new mortgage depend on the sale?
Check the mortgage offer on the new home for a condition requiring you to sell your current home or repay its mortgage. If it has one, buying first needs a revised offer or another funding plan.
An agreement in principle is not a mortgage offer. Tell the lender about bridging borrowing or a plan to keep the old home, so it can assess the actual arrangement.
In England, Wales and Northern Ireland, exchange usually creates the binding contract.
In Scotland, concluded missives make the contract binding. Ask your solicitor to check funding and contract conditions before you commit.
What are the risks of buying a house before selling yours?
If a loan is secured on your home, your home is at risk and could be repossessed if the loan is not repaid.
Borrowing costs add up over time. Delayed selling can leave you paying interest and running both homes for longer, while deferred interest increases what you must repay.
A sale or a new mortgage may not happen as planned. A buyer may pull out, a survey may lead to a price reduction, or the new lender may decline the application.
An extension is not automatic. Ask what you would do if the loan reached its repayment date before the sale completed, and whether a lower sale price would still clear it.
Will I pay extra stamp duty?
In England and Northern Ireland, buying before selling your main home will usually mean an extra Stamp Duty Land Tax charge. You need money for that at purchase.
You may later qualify for a refund under the main residence replacement rules. Do not count on a refund to fund completion.
Wales uses Land Transaction Tax. Scotland uses Land and Buildings Transaction Tax, with an Additional Dwelling Supplement. Each system has its own extra charge and refund rules.
Check tax when buying before selling with your solicitor before setting the budget.
What should I ask before choosing a route?
Start by asking your current mortgage lender about other options, including porting, borrowing more and consent to let. Ask what happens to your existing mortgage if you buy before selling.
For a loan secured on your home, take advice from a mortgage adviser or bridging specialist. Free guidance is available from MoneyHelper.
Ask your estate agent, solicitor and mortgage adviser these questions before you choose a route.
- Can I fund the deposit, purchase costs and bills without the sale proceeds?
- Does the new mortgage offer allow me to keep my current home?
- What costs apply at the start, during the loan and when I repay?
- What sale evidence does the lender need, and what happens if the buyer withdraws?
- What would I do if my home sold for less or the planned new mortgage fell through?
Common questions
Can I buy a house before selling mine?
Yes, if you can fund the purchase before your sale completes. You might use savings, keep two mortgages, let your old home or consider bridging borrowing. Any borrowing depends on the lender's checks and your circumstances.
Will I have to pay two mortgages if I buy before I sell?
You may have to pay both mortgages while you own both homes. Your current mortgage does not end when you move out. The lender considers existing commitments when assessing a new mortgage.
Is there a buy before you sell mortgage?
The phrase can describe different borrowing arrangements. You might keep your existing mortgage and take a new one, use let to buy or consider a bridging loan. Each needs its own assessment.
Do I pay extra stamp duty if I buy before selling?
In England and Northern Ireland, you usually face an extra charge if you still own your previous main home at completion. A later refund depends on meeting the rules. Wales and Scotland have different property taxes.
Last updated 6 November 2026
