Sell Property Before Completion UK - What Buyers and Investors Need to Know
Can you sell a property before completion in the UK?
Selling property before completion in the UK can mean different things depending on whether you already own the property or have only exchanged contracts to purchase it.
For an ordinary property sale, the seller remains the legal owner until completion. An accepted offer is not legally binding in England and Wales until contracts are exchanged. After exchange, the agreement becomes legally binding and withdrawing can have financial consequences.
For an off-plan property that you have agreed to purchase but have not yet completed on, the situation can instead involve assigning your contractual rights to another buyer.
Selling before completion versus assigning a property contract
These two situations should not be confused.
If you already own a property and have agreed to sell it, the transaction proceeds through the normal conveyancing process. You remain the owner until completion.
If you have purchased an off-plan property under contract but completion has not happened, you may be able to transfer your contractual rights to another purchaser through an assignment, provided the contract allows it and any required consent is obtained.
HMRC's rules specifically recognise assignments and other pre-completion transactions where another person becomes entitled to call for the conveyance under the original contract.
Can you sell a property after exchange but before completion?
Yes, a property can still be sold after exchange in the sense that the existing transaction can be dealt with through the appropriate legal mechanisms, but the original seller is already legally committed to the buyer.
You cannot simply treat the original contract as cancelled because you have found another purchaser.
GOV.UK states that once contracts have been exchanged, the agreement is legally binding and usually neither party can withdraw without compensation.
If circumstances have changed after exchange, speak to your solicitor before entering into another transaction.
Selling an off-plan property before completion
Off-plan property is where selling before completion becomes particularly relevant to investors.
Suppose you agreed to purchase an apartment from a developer for £350,000. Construction is still underway, but you decide you no longer want to complete the purchase.
If the purchase contract permits assignment, you may be able to find another buyer who takes over the relevant contractual position.
The developer may need to approve the assignment and may charge an administration fee.
The exact process depends on the original contract.
How to sell an off-plan contract before completion
1. Review the original purchase contract
Check whether assignment is permitted and identify any restrictions.
Look for provisions covering:
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Assignment
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Developer consent
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Transfer fees
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Resale restrictions
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Notice periods
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Completion dates
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Deposits
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Outstanding instalments
2. Establish your financial position
Calculate how much you have already paid and what remains payable.
You should also account for legal fees, developer charges, finance costs and any other expenses associated with the transaction.
3. Establish the property's current value
Research comparable properties and consider whether the contractual position is commercially attractive to another buyer.
If the property has increased in value since the original contract was signed, an assignment may potentially allow you to capture some of that increase.
4. Obtain developer consent where required
If the contract requires the developer's approval, establish the procedure before agreeing an assignment with another buyer.
The developer may require information about the incoming purchaser and payment of an administration fee.
5. Find an incoming purchaser
The buyer needs to understand exactly what they are acquiring and what remains payable under the original contract.
They should also receive appropriate legal advice before proceeding.
6. Instruct solicitors
The parties' legal representatives can establish the correct structure, prepare the necessary documents and communicate with the developer.
7. Check the tax position
An assignment can create specific SDLT considerations, so the transaction should be reviewed before the parties commit to the final structure.
SDLT when selling before completion
The SDLT treatment depends on how the transaction is structured.
HMRC's current guidance explains that where an original property contract exists and, before it is substantially performed or completed, another agreement gives a different person the right to call for the conveyance, this can constitute a pre-completion transaction.
For an assignment of rights, HMRC broadly states that the incoming purchaser's consideration can include what they pay under the original contract plus what they pay for the assignment.
For example, HMRC gives a scenario where a £1 million property contract is assigned for £100,000. The eventual purchaser's SDLT consideration is treated as £1.1 million in that example.
The actual tax treatment depends on the transaction structure and circumstances, so professional SDLT advice is important.
What if the property has increased in value?
An increase in value can make a pre-completion sale or assignment commercially interesting.
For example:
Original purchase price: £300,000
Potential assignment price: £335,000
Gross difference: £35,000
However, the £35,000 difference is not necessarily the seller's net profit.
The calculation should also consider:
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Legal fees
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Developer assignment fees
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Estate agency or marketing costs
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Mortgage and finance costs
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Taxes
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Outstanding contractual payments
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Other transaction expenses
The buyer will also compare the opportunity with similar properties available on the market.
What if the property has fallen in value?
Selling before completion can be more difficult when the property's current market value is below the original contract price.
If you have already exchanged contracts, you may still be legally committed to the original purchase.
Possible routes could include:
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Negotiating with the developer
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Exploring assignment
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Considering a subsale structure
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Reviewing the contract for specific exit provisions
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Completing the purchase and selling afterwards
The appropriate route depends on the contract and the circumstances.
What if you have not exchanged contracts?
The position is generally more flexible in England and Wales.
GOV.UK states that an offer is not legally binding until contracts are exchanged.
However, you may still have incurred costs such as solicitor fees, searches, surveys or other expenses.
If you are considering withdrawing before exchange, check your contractual and financial position rather than assuming there will be no costs.
Can you sell a new-build property before completion?
A new-build property can potentially be sold before completion, but the answer depends on the stage of the transaction.
If you already own the property, the normal sales process may apply.
If you have only contracted to purchase the property from a developer, you may instead need to use an assignment, subsale or another permitted structure.
Developers can also impose specific restrictions on pre-completion sales, so the original contract should be reviewed before marketing the property.
Common mistakes when selling before completion
Assuming an accepted offer is the same as completion
An accepted offer is not the same as legal ownership or a completed sale.
Ignoring exchange of contracts
The legal position changes significantly after exchange.
Marketing an off-plan contract without checking assignment rights
A developer may restrict assignments or require written consent.
Forgetting about SDLT
A pre-completion assignment can have specific SDLT consequences.
Calculating profit from the sale price alone
All transaction costs should be included when assessing the actual financial outcome.
Waiting until the completion date
If an investor wants to exit an off-plan purchase, leaving the process until the last minute can make the transaction more difficult to coordinate.
A practical checklist before selling property before completion
Before proceeding, establish:
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Whether you already own the property.
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Whether contracts have been exchanged.
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Whether the property is off-plan.
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Whether assignment is permitted.
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Whether developer consent is required.
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Whether an assignment fee applies.
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How much has already been paid.
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What remains payable.
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The property's current market value.
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The potential tax and legal consequences.
Fraser Bond support with pre-completion property sales
Fraser Bond can support property investors and owners assessing pre-completion sales, off-plan assignments and wider property exit strategies across London and the UK.
Our property consultancy support can include assessing the commercial position, coordinating relevant property professionals and helping investors understand the practical considerations surrounding a proposed sale or assignment.
Where legal drafting, conveyancing or tax advice is required, these matters should be handled by appropriately qualified solicitors, conveyancers or tax advisers.
Understanding the contractual position early can give property investors more time to assess their options before the completion deadline.
