How Long Between Exchange and Completion

Once contracts are exchanged, completion usually follows about two weeks later. That is the figure most lenders and guidance sources give, and it is the one to plan around. But it is not a rule: completion can happen on the same day as exchange, the day after, or several weeks later. One independent guide puts the typical wait at around four weeks, and a conveyancing guide describes the period as anywhere between one day and several weeks¹.

What fixes the date is the contract. Before exchange, the completion date is a target that can slip. After exchange, it is binding on both sides, which is why buyers and sellers settle it in advance rather than leaving it open. The gap exists to give everyone time to draw down the mortgage, move money, pack and move out.

The practical answer for most people: expect roughly two weeks, treat anything from the same day to four weeks as normal, and know that longer gaps happen when a chain, a new build or a government scheme is involved.

Completion usually follows exchange by about two weeks

Two weeks is the number that comes up most often. One lender states that completion dates are usually two weeks after exchange, but could be as little as one day, and another uses the same wording⁶. A third says completion usually happens up to a week later, and a fourth puts the wait at around two weeks, more in some cases⁷.

Independent guidance is slightly more generous with time. Citizens Advice says completion usually takes place about four weeks after exchange of contracts, although it can be earlier¹. Which? says completion often takes place around two weeks after exchange, but that this is flexible and a convenient date can be agreed with the seller². Experian describes completion as often a week or so after exchange¹¹.

The spread is not a contradiction so much as a reflection of what is being measured. A simple purchase with a ready buyer, a ready seller and no chain can complete in days. A purchase at the end of a long chain, or one where the mortgage money has to be requested and released, tends to sit nearer the two to four week mark. The date itself is agreed, not calculated.

The normal range: from the same day to around four weeks

Across the sources, the working range runs from the same day to about four weeks. Teachers Building Society describes the gap as usually 7 to 28 days after exchange, but says it can happen on the same day⁴. Coventry Building Society says the period between the solicitors exchanging contracts and completion can vary, but is usually no longer than four weeks⁵. HSBC and first direct both put the typical figure at two weeks, with one day as the floor⁶.

At the outer edge, Santander describes an interval that could be a week to two months, noting that some people prefer a longer gap⁸. first direct's conveyancing guide says the period can take anywhere between one day and several weeks³.

The reason the range is so wide is that the gap is doing a job rather than marking time. It has to cover the mortgage lender releasing funds, the buyer's deposit and completion money moving between solicitors, and the physical move. Where all of that is ready, the gap shrinks. Where it is not, it stretches.

Agreeing the completion date that suits you

The completion date is agreed between buyer and seller, normally through their solicitors, and it has to work for everyone in the chain as well as the mortgage lender. Which? notes the date is flexible and can be agreed with the seller². In practice the conversation starts early, often before the mortgage offer is issued, because the date has to be written into the contract before exchange.

Some schemes and developers set the date for you rather than negotiating it:

• Help to Buy Wales: completion must happen within six months of exchanging contracts¹².
• Shared Ownership in Wales: completion is usually within 10 working days of exchange if the home is ready to move into, and the date for exchange is usually 28 days from the date the property was offered¹³.
• New builds: developers typically expect contracts to be exchanged within 28 days of reservation, which pushes the completion date later into the build programme¹⁴.
• Co-Ownership in Northern Ireland: the whole process from accepted offer to completion typically takes 8 to 12 weeks¹⁵.

Where a chain is involved, the date has to be agreed up and down it. That is the single biggest reason a completion date moves: one link cannot make the day, so every link shifts. If a sale falls through or a completion is delayed, the consequences run through the chain, and Citizens Advice sets out what happens when a completion is delayed¹⁶.

Completing on the same day as exchange: what it means

Same-day exchange and completion is possible. Leeds Building Society states that exchange of contracts and completion can take place on the same day in some circumstances⁷. Teachers Building Society includes the same day within its range⁴, and first direct describes the period as anywhere between one day and several weeks³.

It is unusual because it removes the safety net. The gap between exchange and completion exists so that if something goes wrong, there is time to fix it before money and ownership change hands. On a same-day purchase, the mortgage funds, the deposit and the legal transfer all have to land at once. It tends to happen where a buyer and seller are both chain-free, both ready to move, and the solicitors have everything prepared in advance.

There is a separate arrangement with a similar name that is not the same thing. Exchange with delayed completion is where a sale price is agreed and a deposit paid at exchange, but completion of the contract is delayed for a few years. Citizens Advice describes it as an arrangement where, unlike a normal house sale, completion is delayed for a few years¹⁶. That is a long-stop version of the gap, not a same-day one.

Can the gap be longer than four weeks?

Yes. Santander describes intervals of a week to two months, noting some buyers prefer a longer gap⁸. first direct's conveyancing guide says the period can run to several weeks³. Longer gaps usually come from one of four causes: a related sale or purchase that has to complete first, a new build that is not finished, a scheme with its own deadline, or a buyer and seller who simply want more time to arrange a move.

Government schemes often build the deadline into the contract rather than leaving it open. Help to Buy Wales requires completion within six months of exchange¹². Shared Ownership in Wales sets completion at usually within 10 working days of exchange where the home is ready¹³. New build developers typically expect exchange within 28 days of reservation, with completion following the build¹⁴.

Where a longer gap is agreed, the buyer's mortgage offer has to still be valid on the completion date. A mortgage offer is typically received within four weeks of applying, and the period between receiving an offer and exchanging contracts can be as quick as two to four weeks but can be longer¹⁷. A long gap between exchange and completion eats into the life of that offer, which is one practical reason most gaps stay short.

What protects you, and where it stops

Exchange of contracts is the point at which the purchase becomes legally binding. Before exchange, either side can walk away. After it, they cannot, and the completion date in the contract is enforceable. That protection cuts both ways: it stops a seller accepting a higher offer after exchange, and it stops a buyer changing their mind.

The deposit paid at exchange is the buyer's commitment. If the buyer fails to complete, that deposit is at risk. If the seller fails to complete, the buyer has a claim. This is the mechanism that makes the agreed completion date meaningful rather than aspirational.

Some related protections run on their own clocks:

• Stamp Duty Land Tax on linked transactions: each purchase or transfer must be notified within 14 days of the effective date, usually the completion date¹⁹.
• Stamp Duty refunds: a refund claim for overpaid Stamp Duty must be made no more than four years after the effective date of the transaction²⁰.
• Help to Buy equity loan repayment: the Authority to Complete is issued within 5 days of receiving the legal undertaking from the conveyancer, or when a payment plan has been agreed²¹.
• Part-exchange goods under the Consumer Credit Act 1974: where a cancellation right applies, part-exchange goods must be returned within ten days of cancellation²³.

Where a completion is delayed or a sale falls through, the routes for complaint and redress sit with the conveyancer's regulator and, for mortgage-related disputes, the Financial Ombudsman Service. The ombudsman publishes case studies on transfer timing disputes, including one where a business missed a day's cut-off but could complete the transfer by the next working day²⁴.