There is a peculiar stage in almost every house move when the boxes are not quite packed, the removals firm is reluctant to hold a date forever, and everyone keeps saying they are “nearly ready to exchange”. I have always thought that “nearly” is one of the most elastic words in conveyancing.
Exchange of contracts is the moment that changes the legal position. Before exchange, an accepted offer is usually no more than an agreement in principle: Either side can still withdraw or try to renegotiate. After exchange, the buyer must buy, the seller must sell, and both are committed to completing on the contractual date.
Quick answer: Exchange of contracts takes place when the buyer’s and seller’s signed contracts are formally brought into effect, normally by their solicitors or licensed conveyancers. The transaction then becomes legally binding. The buyer usually pays an exchange deposit, the completion arrangements are fixed, and withdrawing becomes a breach of contract with potentially serious financial consequences.
Jurisdiction: This guide covers ordinary residential sales and purchases in England and Wales. Scotland and Northern Ireland use different conveyancing systems. Auctions, new-build purchases and transactions involving a separate reservation agreement may also follow different rules.
Contents
- What is exchange of contracts?
- Signing and exchange are not the same thing
- What becomes legally binding?
- Who actually exchanges the contracts?
- What must happen before exchange?
- How does the exchange deposit work?
- How does exchange work in a property chain?
- Exchange and completion: What is the difference?
- How long is there between exchange and completion?
- Why does buildings insurance matter?
- What happens if somebody pulls out?
- What commonly delays exchange?
- Practical steps before authorising exchange
- Frequently asked questions
What is exchange of contracts?
Exchange of contracts is the point at which a residential property sale becomes contractually binding. The buyer and seller will each have signed a contract containing the agreed terms. Their conveyancers then complete a formal exchange procedure that brings those contracts into effect.
The phrase sounds as though two bundles of paper must be physically swapped across a desk. That was once a more literal description. Today, exchange is commonly carried out by conveyancers over the telephone or through an agreed electronic process, with the signed documents held by the respective firms.
A contract for the sale of land must comply with section 2 of the Law of Property (Miscellaneous Provisions) Act 1989. Broadly, it must be in writing, include all the expressly agreed terms and be signed by or on behalf of each party.
Before exchange, the transaction is normally “subject to contract”. An estate agent may have issued a memorandum of sale and the seller may have accepted the offer, but that does not usually create the final sale contract. The government’s guidance on making an offer confirms that an offer is not legally binding in England and Wales until contracts are exchanged.
There are exceptions. A successful auction bid will usually create a binding contract immediately, while a separate reservation, exclusivity or conditional agreement may impose obligations before the ordinary sale contract is exchanged.
Signing and exchange are not the same thing
Signing the contract does not, by itself, usually commit the buyer or seller. It puts the conveyancer in a position to exchange when everything else is ready and the client has given authority.
A buyer may sign several days before exchange. The seller may have signed earlier still. The documents remain with the conveyancers while searches, enquiries, mortgage arrangements, deposit funds or the property chain are finalised.
Until exchange actually takes place, either party can ordinarily withdraw. That remains true even if a completion date has been discussed and the removals company has been provisionally booked. Once exchange has been completed, the client cannot undo it simply by changing their mind a few minutes later.
The safest way to remember the distinction is this: A signature prepares the contract; exchange activates it.
What becomes legally binding?
Exchange fixes the contractual bargain. The binding arrangements will normally include the property, the purchase price, the deposit, the completion date, the title being sold and any special conditions.
The contract will also incorporate or refer to supporting documents, including the seller’s property information form and the fittings and contents form. Curtains, appliances, sheds, light fittings and other items should not be left to memory or a conversation during the viewing. My guide to fixtures and fittings in a house sale explains how the agreed contents become part of the contractual position.
Exchange does not complete the transfer of ownership. The seller remains the registered proprietor and is normally entitled to possession until completion. Exchange instead gives each party enforceable rights and obligations: The seller must complete the transfer, and the buyer must pay the balance of the price, on the agreed terms. After completion, the transfer is registered at HM Land Registry; for registered land, registration completes the transfer of the legal title.
The completion date is usually fixed at exchange in an ordinary sale of an existing home. A new-build contract may instead provide for completion “on notice” after the property is ready, often with a long-stop date protecting the buyer against excessive delay.
Who actually exchanges the contracts?
In most transactions, the buyer and seller do not meet or exchange documents personally. Their solicitors or licensed conveyancers deal with the formal procedure.
Traditional exchange is commonly carried out by telephone under one of the Law Society’s agreed formulae. The conveyancers confirm that they hold the signed contracts, check that the terms match, record the completion date and bring the contract into existence. The Law Society’s code for signing and exchanging property contracts also accommodates modern methods of signing and exchange.
The buyer and seller must first give their conveyancers authority. It is quite normal to hear, “We are authorised and trying to exchange today,” followed by several hours of silence. That does not mean exchange has happened. In a chain, each linked transaction must be lined up, and an unresolved issue several properties away can hold up everybody else.
Your conveyancer should confirm expressly when exchange has taken place. Until that confirmation arrives, do not assume that the transaction is binding.
What must happen before exchange?
There is no single statutory checklist for every transaction. The necessary work depends on the property, the buyer’s funding and the contract. However, a prudent buyer should not authorise exchange until the legal, financial and practical pieces are in place.
The legal investigation should be complete
The buyer’s conveyancer should have investigated the title, reviewed the contract papers, obtained the appropriate searches and received satisfactory replies to enquiries. Any restrictions, rights of way, planning issues, rentcharges, lease terms or other title problems should either be resolved or clearly explained and consciously accepted.
My guides to what a conveyancing solicitor does and conveyancing searches explain this investigation in more detail.
The buyer should understand the report on title
The buyer will normally receive a written report explaining the property, the title, the searches, the contract and any mortgage conditions. It can be tempting to skim it because exchange finally seems close. This is exactly the wrong moment to stop asking questions.
If a right, restriction, boundary, service charge or planning entry is unclear, ask before authorising exchange. After exchange, discovering that the garden is smaller than expected or that an extension lacks satisfactory paperwork will not normally provide a convenient exit.
The mortgage and funding must be secure
A mortgage agreement in principle is not enough. The buyer should have a formal offer for the correct property and amount, and the conveyancer must be satisfied that its conditions can be met. The offer should remain valid beyond the intended completion date.
The buyer’s deposit must be available in cleared funds, unless it is being supplied from a related sale. A gifted deposit, overseas transfer, inheritance or contribution from another person may require additional evidence and lender approval. The Solicitors Regulation Authority explains why solicitors ask about the source of purchase funds.
The survey and price should be settled
A lender’s valuation is not a survey for the buyer’s protection. Any desired survey, specialist inspection or quotation for repairs should be obtained before exchange.
If a survey reveals a serious defect, the buyer may proceed, renegotiate or withdraw while the transaction remains subject to contract. Once exchange has taken place, the buyer cannot normally reduce the price or abandon the purchase simply because a previously discoverable defect comes to light.
The documents and completion date must be agreed
The contract price, property description, names and completion arrangements should be correct. The property information and fittings and contents forms should match what has been agreed. Any allowance, retention, repair promise or special arrangement should be recorded properly rather than left in an informal conversation.
Everyone in the chain must agree a workable completion date. I would avoid making expensive, non-refundable arrangements until exchange has been confirmed, however confident everybody sounds beforehand.
The seller must also be ready
The seller should have signed the contract, answered the buyer’s enquiries, agreed the fittings and contents, and dealt with any title issue that must be resolved before exchange. If there is a mortgage, the seller’s conveyancer must be able to redeem it on completion.
In an ordinary owner-occupied sale, the seller will usually promise vacant possession. That means the occupants and their belongings must be out by completion, except for items agreed to remain.
How does the exchange deposit work?
The word “deposit” is used in two ways. A mortgage broker may use it to describe all the buyer’s own money. The contractual exchange deposit is the amount paid or secured under the sale contract when exchange takes place.
Under the standard form of residential contract, the exchange deposit is normally 10% of the purchase price. It acts as security for the buyer’s performance between exchange and completion.
That does not mean every buyer physically transfers 10% on the day. A buyer who is also selling may use the deposit received on their sale towards the onward purchase. A buyer with a 95% mortgage may only have 5% available. The seller can agree to accept a reduced deposit.
A reduced payment does not necessarily reduce the buyer’s liability if they later default. The contract may provide that the balance needed to make up the full 10% becomes immediately payable. Buyers should not assume that paying 5% at exchange limits the possible loss to 5%.
The deposit is normally held by the seller’s conveyancer as stakeholder rather than handed freely to the seller. In a chain, the contract may permit it to be used as the deposit on the seller’s onward purchase. The balance of the price is paid on completion.
How does exchange work in a property chain?
A property chain is a series of linked transactions. The first buyer may have nothing to sell, while each person above is selling one home to fund the next. At the top, somebody is selling without making an onward purchase.
Every link must usually be ready before the chain exchanges. Each conveyancer needs a signed contract, client authority, an agreed completion date and satisfactory deposit arrangements. The exchanges are coordinated so that one party is not left bound while a dependent transaction remains uncertain.
Deposits commonly move up the chain. Because the properties may have different prices, the deposit available at each level may be less than 10% of that purchase price. The conveyancers must agree how any shortfall will be dealt with.
This explains why the words “we are ready” do not always produce an immediate exchange. You may be ready, your buyer may be ready and your seller may be ready, but one missing mortgage offer or unresolved enquiry elsewhere can stop the chain.
Until the chain exchanges, gazumping, gazundering or a change of heart remains possible. My guide to gazumping and gazundering explains the position before the contract becomes binding.
Exchange and completion: What is the difference?
At exchange, the contract becomes binding, the completion arrangements are fixed and the buyer usually provides the contractual deposit. The seller remains the registered proprietor and is normally entitled to possession. The buyer does not usually receive the keys or the right to move in.
At completion, the buyer’s conveyancer transfers the balance of the purchase money to the seller’s conveyancer. Once completion has occurred, the seller must release the property and the buyer becomes entitled to possession. The keys can usually be collected from the estate agent. The transfer is then registered at HM Land Registry; for registered land, registration completes the legal title.
My completion day guide and checklist explains what happens to the money, when the keys are released and what buyers and sellers should do on moving day.
A buyer should not move possessions into the property or begin work before completion unless a properly documented arrangement permits it. See my guide to a licence to occupy before completion.
How long is there between exchange and completion?
There is no legally required gap. The period is whatever the parties agree.
One or two weeks is common in an ordinary residential chain, although a period of up to four weeks is not unusual. Some transactions exchange and complete on the same day. Others have a longer interval because the parties need time to move, a tenant must leave, or a new-build property is not yet finished.
A longer gap gives people time to book removals, arrange mortgage funds and organise the move with the certainty of a binding contract. Simultaneous exchange and completion removes that interval, but leaves moving arrangements uncertain until the last moment. My separate guide asks whether you can exchange and complete on the same day.
There is no fixed time of day for exchange. It usually happens during ordinary working hours, but a long chain may not become ready until later. “We are aiming to exchange this morning” is an intention, not a guarantee.
Why does buildings insurance matter?
Many buyers assume that risk remains with the seller until the keys are handed over. Under the Law Society’s Standard Conditions of Sale, which are commonly incorporated into residential contracts, the property is usually at the buyer’s risk from exchange unless the contract provides otherwise.
Serious damage between exchange and completion may not release the buyer from the obligation to complete at the agreed price. The buyer should therefore arrange suitable buildings insurance before authorising exchange and make sure the start date is correct.
The position may differ for a leasehold flat covered by the freeholder’s block policy, or where the contract contains special insurance provisions. My guide to house insurance on exchange of contracts explains the points to check.
What happens if somebody pulls out?
After exchange, “pulling out” is not a cost-free choice. It is a failure to perform a binding contract. The remedy depends on the contract, the default and what happens next.
If the buyer fails to complete
The seller may be entitled to keep the deposit, terminate the contract after following the required procedure, resell the property and claim further losses. Those losses can include the difference if the property later sells for less, additional legal and estate-agent costs, interest and expenses caused by the failed completion.
If less than 10% was paid at exchange, the buyer may also be liable for the amount needed to bring the deposit up to 10%. The deposit is not necessarily the maximum possible loss.
If the seller fails to complete
The buyer will normally be entitled to the return of the deposit and may have a claim for losses caused by the breach. In an appropriate case, the buyer may seek an order for specific performance requiring the seller to complete, although litigation is fact-sensitive and not an instant solution to a moving-day crisis.
If completion is delayed
The innocent party may be able to claim contractual interest and reasonably foreseeable losses. A formal notice to complete may be served, making time of the essence and beginning the contractual process towards termination if the default is not remedied.
My guide to delayed conveyancing completion explains notices to complete, interest and the effect on a chain.
What commonly delays exchange?
Outstanding enquiries: The buyer may still be waiting for planning documents, building regulations approval, guarantees, certificates or a satisfactory explanation of the title.
Mortgage issues: The formal offer may not have arrived, the valuation may have raised a concern, or the lender may require a deed, insurance policy or further report.
Source-of-funds checks: Gifted deposits, overseas money and recent large transfers often need supporting evidence. Leaving this until the proposed exchange date can halt an otherwise ready transaction.
Survey negotiations: A defect may lead to specialist inspections, estimates and a proposed price reduction. The revised terms must be settled and reflected in the contract and mortgage arrangements.
Leasehold information: A leasehold sale may require a management pack, service-charge accounts, insurance details and information about planned works. Slow responses from a freeholder or managing agent are a common source of delay.
A title problem: Restrictions, missing rights, absent consents, defective leases, rentcharges or Land Registry discrepancies may need a deed, consent, indemnity policy or lender approval.
The property chain: Every transaction may be legally ready but still unable to exchange because one party cannot agree the completion date or has not secured an onward purchase.
Speed matters, but it is not the only objective. A rushed exchange can turn an unresolved question into the buyer’s long-term problem.
Practical steps before authorising exchange
Read the report on title and contract documents while there is still time to ask questions. Do not be embarrassed to ask what a legal phrase means or why a particular risk is acceptable. A good explanation should make the decision clearer, not merely repeat the jargon.
Keep the deposit in an account from which it can be transferred in time, and provide source-of-funds evidence early. Never send a substantial payment solely because an email says the firm’s bank details have changed. Verify the details using a trusted telephone number obtained independently. The SRA publishes current scam alerts for legal services.
Make sure buildings insurance is ready, the completion date falls within the mortgage offer and any gifted-deposit or scheme conditions have been satisfied.
Discuss possible moving dates early, but keep removals and accommodation flexible until exchange. Tell the conveyancer about any last-minute change in the price, funding, occupants, contents or completion arrangements. The contract should reflect the real agreement.
Frequently asked questions
Is an accepted offer legally binding?
Usually not in an ordinary private sale in England and Wales. The transaction generally remains subject to contract until exchange. A reservation or exclusivity agreement, or an auction purchase, may create earlier obligations.
Am I committed when I sign the contract?
Not usually. Signing allows your conveyancer to exchange when authorised. You become bound when exchange is formally completed.
Do I need to be present when contracts are exchanged?
No. Your solicitor or licensed conveyancer normally handles the exchange after receiving your authority.
How do I know that exchange has happened?
Your conveyancer should confirm it expressly. A message that the parties are “ready”, “released” or “hoping to exchange” is not confirmation that exchange has occurred.
Do you get the keys when contracts are exchanged?
No. The keys are normally released on completion after the seller’s conveyancer has received the completion money. Exchange secures the deal; completion is when the price is paid and the buyer becomes entitled to possession, with registration following.
Can contracts be exchanged without a 10% deposit?
Yes, if the seller agrees. A reduced deposit is common where the buyer has a high loan-to-value mortgage or is relying on a smaller deposit from a related sale. The buyer may still be liable to make it up to 10% if they default.
Can you exchange without a mortgage offer?
A cash buyer can, but a buyer who needs mortgage funding takes an extreme risk by exchanging without a satisfactory formal offer. The contract remains binding even if the lender refuses or cannot release the money.
Should I book removals before exchange?
A provisional or refundable booking may be sensible, but a firm non-refundable commitment is risky. Until exchange, the moving date can change and the transaction can still fall through.
Can the price change after exchange?
Not unilaterally. The parties can agree a variation through their conveyancers, but neither can simply impose a different price.
What if the property is damaged after exchange?
The answer depends on the contract, but under the commonly used Standard Conditions of Sale the risk usually passes to the buyer at exchange. The buyer may still have to complete, which is why insurance should be arranged in advance.
What if my mortgage offer expires after exchange?
The purchase contract does not automatically end. The buyer remains obliged to complete and may need an extension, replacement mortgage or other funds. The expiry date should be checked before exchange.
The point at which the uncertainty changes
Exchange of contracts is often described as a single event, but it rests on weeks of investigation, finance and coordination. The exchange call itself may take only minutes. The confidence to make that call should come from knowing that the property has been investigated, the money is secure, the contract is understood and the completion date can be met.
Before exchange, the move may still feel provisional. Afterwards, the date in the diary is no longer an aspiration: It is a contractual commitment.
The best exchange is not necessarily the fastest one. It is the exchange that takes place as soon as the transaction is genuinely ready, with no important question left unanswered and no one mistaking hope for legal certainty.
Last legally reviewed: 2 August 2026
This guide is based on general principles of English and Welsh law, is intended for informational purposes only, and does not constitute legal advice or establish a professional relationship.
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