Buying a new home before selling your current one means funding the purchase while your existing property remains yours. That can create a gap between when you need money and when your sale proceeds become available.
Before committing, work out how you would cover that gap, the costs of owning both properties and what would happen if your sale took longer than expected.
Separate making an offer from completing a purchase
You can discuss a purchase before your own home has sold. Tell the estate agent whether your property is on the market, whether you have accepted an offer and whether you need the proceeds to fund your next home.
However, an accepted offer and a completed purchase are different stages. A seller’s willingness to wait does not provide the money needed to complete.
In England and Wales, an offer is not legally binding until contracts are exchanged. In Scotland, the contract becomes binding when missives are concluded. Ask your solicitor to explain the process where you are buying, including any conditions needed to protect your position.
If your purchase depends on selling, make that dependency clear before entering a binding contract. Do not assume you can withdraw without financial consequences if your own sale falls through.
Work out how much money is available now
Equity is the difference between your property’s value and the outstanding borrowing secured against it. It is not cash you can automatically use for another purchase.
Start with two separate calculations:
- Money available before selling: accessible savings and any borrowing that a lender has agreed to provide for the purchase.
- Money expected after selling: the eventual sale price, less mortgage repayment, selling costs and any applicable early repayment charges.
Allow for the purchase deposit, legal work, surveys, property tax and moving costs. Ask your solicitor when each payment is needed.
Test the figures against a lower selling price and a longer overlap between properties. If either would leave a funding shortfall, resolve it before committing.
Treat an online valuation as an estimate
An online estimate can help you begin planning, but it does not establish what a buyer will pay or when a sale will complete. Compare it with recent sales of similar properties and local estate agents’ assessments.
The page linked through value your house with Sold offers an online valuation tool from SOLD.co.uk, a commercial estate agency. It also promotes the company’s selling services and describes follow-up contact after a valuation.
Treat the estimated value separately from any subsequent offer or agreement to sell. Before using a selling service, check the proposed price, who would buy the property, any fees or deductions, the contract terms and whether the completion date is binding.
Check borrowing against your circumstances
Having equity in your current home does not, by itself, establish that you can obtain another mortgage. A lender will assess your application, including your income, spending, existing commitments and the property.
Explain that your current home has not sold. Ask how its mortgage and running costs would affect the assessment, and disclose any borrowing intended to fund the deposit.
Mortgage comparison considerations were explained by Money Saving Expert in its email dated 6 May 2025. That page is an archive: its rates and offers should not be treated as current quotations. Obtain up-to-date figures, including fees and early repayment charges.
Checking your credit reports for errors is another preparation step. The process is discussed by the site The Week in an explanatory article about UK credit scores. Reading that article or checking a score does not establish mortgage eligibility.
Budget for the period when you own both homes
Prepare a monthly budget covering both properties. Include mortgage payments, insurance, utilities, council tax where payable, maintenance and any service charges.
Also ask your conveyancer to calculate the property tax due if your existing home remains unsold:
- England and Northern Ireland: higher rates of Stamp Duty Land Tax can apply.
- Scotland: the Additional Dwelling Supplement can apply alongside Land and Buildings Transaction Tax.
- Wales: higher residential rates of Land Transaction Tax can apply.
A later sale of your former main home can qualify for repayment of the additional tax if the relevant conditions and deadlines are met. Do not assume a refund is automatic or count it as money available to complete the purchase.
Compare the timing options before committing
Compare buying first with coordinating the sale and purchase, or selling first and arranging temporary accommodation. Each involves different costs and practical compromises.
For each option, write down the cash needed upfront, the monthly costs and your fallback if the move is delayed. Then review the funding with your lender or mortgage adviser and the contractual commitments with your solicitor.
The key question is whether you can complete the purchase and meet your commitments even if your existing home sells later, or for less, than you expect.
