Sell Apartment Before Completion UK - Options for Buyers and Investors
Can you sell an apartment before completion in the UK?
Selling an apartment before completion can mean different things depending on the stage of the transaction.
If you already own an apartment and have agreed a sale to another buyer, the normal conveyancing process applies. The sale becomes legally binding when contracts are exchanged, while ownership transfers to the buyer at completion.
If you have agreed to purchase an off-plan apartment but have not yet completed the purchase, you may instead be able to transfer your contractual rights to another buyer. This is commonly known as an assignment.
The original purchase contract is critical because it determines whether assignment is permitted and whether the developer's consent is required.
Selling an apartment before completion versus assignment
These are two different situations.
Selling an apartment you already own
If you have already completed the purchase and legally own the apartment, you can normally put it on the market and sell it through the standard property sales process.
The buyer and seller exchange contracts before completion. Once completion takes place, the buyer becomes the new owner.
Assigning an off-plan apartment contract
If you have not yet completed the purchase, you may not legally own the apartment yet.
Instead, you may hold contractual rights under an agreement with the developer. If the contract permits assignment, you may be able to transfer those rights to another purchaser.
HMRC's current guidance specifically covers assignments of rights as pre-completion transactions.
Can you sell an off-plan apartment before completion?
Potentially, but you need to check the original purchase agreement first.
An off-plan apartment contract may contain specific provisions covering:
-
Assignment
-
Developer consent
-
Assignment administration fees
-
Resale restrictions
-
Notice requirements
-
Completion deadlines
-
Deposit payments
-
Outstanding instalments
-
Requirements for an incoming buyer
Some developers allow assignments subject to conditions, while others may restrict them.
Finding a buyer does not automatically give you the right to transfer the contract.
How to sell an off-plan apartment before completion
1. Review your purchase contract
Start by asking a property solicitor or conveyancer to review the original agreement.
The key question is whether you have a contractual right to assign your position.
Also check whether the developer has to provide written consent.
2. Confirm the developer's requirements
If consent is required, establish the developer's procedure before agreeing terms with another buyer.
The developer may request information about the incoming purchaser and may charge an administration fee.
3. Calculate your financial position
Work out:
-
Original apartment purchase price
-
Deposit already paid
-
Outstanding instalments
-
Assignment fee
-
Solicitor fees
-
Finance costs
-
Marketing costs
-
Potential tax liabilities
This gives you a clearer picture of the minimum price you need from an incoming buyer.
4. Establish the apartment's current market value
An off-plan apartment may be worth more or less than when the original contract was signed.
Look at comparable apartments, current developer pricing and the expected rental market.
The remaining construction period and developer's track record can also affect what another buyer is willing to pay.
5. Find an incoming buyer
The buyer needs to understand that they may be taking over a contractual position rather than purchasing a completed apartment from you.
They should understand the original purchase price, amount already paid, outstanding balance and expected completion date.
6. Agree the assignment terms
If the buyer is paying you an assignment premium, make sure the amount and payment arrangements are clearly documented.
For example:
Original apartment contract: £300,000
Assignment payment: £25,000
Amount remaining under original contract: £300,000
The exact financial and legal structure will depend on how the transaction is documented.
7. Complete the legal transfer
The relevant solicitors or conveyancers should prepare the assignment documentation and coordinate with the developer.
All required consents and payments should be dealt with before the contractual deadline.
What happens if the apartment has increased in value?
A rise in value can make an assignment commercially attractive.
For example, an investor might have agreed to purchase an off-plan apartment for £350,000 when construction began. If comparable apartments are later selling at higher prices, another buyer may be prepared to pay a premium to take over the contractual position.
However, the potential gain needs to be calculated after considering all costs.
These can include:
-
Developer assignment charges
-
Solicitor fees
-
Finance costs
-
Marketing expenses
-
Tax
-
Other contractual costs
An apparent £30,000 gain may therefore result in a considerably smaller net return.
What if the apartment has fallen in value?
A fall in value can make selling before completion more difficult.
If the original contract price is above the apartment's current market value, an incoming buyer may have little reason to pay a premium to take over the contract.
Possible options may include:
-
Negotiating with the developer
-
Exploring whether assignment is permitted
-
Considering a subsale structure
-
Reviewing the contract for an exit provision
-
Completing the purchase and selling afterwards
If contracts have already been exchanged, simply refusing to complete can create serious contractual consequences.
GOV.UK confirms that exchanged contracts are legally binding and that withdrawing can result in compensation being payable.
SDLT when selling an apartment before completion
The tax treatment depends on the structure of the transaction.
HMRC's rules state that an agreement entered into before the original property contract is substantially performed or completed, which gives another person the right to call for the conveyance, can constitute a pre-completion transaction.
For an assignment of rights, HMRC broadly states that the incoming purchaser's consideration can include what they give under the original contract plus what they give for the assignment.
HMRC's example illustrates this with a £1 million property contract assigned for £100,000. The eventual purchaser's SDLT consideration is treated as £1.1 million in that example.
The tax treatment can become complicated, so both parties should obtain appropriate SDLT advice before completing an assignment.
What if contracts have not been exchanged?
The position is generally more flexible in England and Wales.
An offer is not legally binding until contracts are exchanged.
If you have agreed to buy an apartment but have not exchanged contracts, you may be able to withdraw from the proposed purchase rather than assigning it.
However, you may still have incurred solicitor fees, searches, surveys, reservation fees or other costs.
Check the documents you have already signed before assuming you can withdraw without financial consequences.
What if contracts have already been exchanged?
After exchange, the original purchase contract is legally binding.
If you want to sell or transfer your position before completion, review the contract to establish whether assignment, a subsale, novation or another permitted arrangement is available.
Do not simply stop making payments or tell the developer that you no longer want the apartment without taking legal advice.
Can you sell a new-build apartment before completion?
A new-build apartment can potentially be transferred before completion, but the contractual structure matters.
If you have already completed the purchase, you are selling an apartment you own.
If the apartment is still under construction and you have only exchanged contracts with the developer, you may instead be looking at an assignment or another pre-completion transaction.
The developer's contract should therefore be reviewed before the apartment is marketed.
Common mistakes to avoid
Assuming you own the apartment before completion
Signing a purchase contract does not necessarily mean you already own the property.
Marketing an off-plan contract without checking assignment rights
The developer may restrict assignment or require consent.
Ignoring assignment fees
A developer's administration charge can affect the overall economics of the transaction.
Forgetting about SDLT
Assignment payments can affect the SDLT treatment of the eventual purchaser.
Waiting until completion is very close
An assignment can involve the original buyer, incoming buyer, developer and several legal representatives. Starting early gives the parties more time to resolve documentation and consent requirements.
Practical checklist for selling an apartment before completion
Before proceeding, establish:
-
Whether you already own the apartment.
-
Whether contracts have been exchanged.
-
Whether the apartment is still under construction.
-
Whether assignment is permitted.
-
Whether developer consent is required.
-
What assignment fees apply.
-
How much has already been paid.
-
What remains payable.
-
The apartment's current market value.
-
The legal and SDLT implications.
Fraser Bond support with pre-completion apartment sales
Fraser Bond can support investors and property owners assessing apartment 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 clients evaluate the practical considerations around 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.
For off-plan investors, reviewing potential exit routes before committing to a purchase can provide greater clarity about the costs and restrictions that may apply if circumstances change before completion.
