A mortgage offer lasts until the expiry date shown on the offer document. Many UK mortgage offers are valid for around three to six months, but the exact period depends on the lender, the product, the property and how the lender counts the validity period.

Some lenders count from the date the offer is issued. Others may count from application or from another point in their process. The date printed on your mortgage offer is the one to work from.

If you do not complete before the offer expires, you may need an extension, a new offer or a new mortgage application. None of these is automatic.

This guide is for general information only and is not personal mortgage advice. Your options depend on your circumstances, the lender’s criteria and the property transaction.

The short answer: how long does a mortgage offer last?

Most borrowers should think in terms of three key dates:

The practical question is not just “how long does mortgage offer last?” It is: will your mortgage offer still be valid on the day completion happens?

That distinction matters because exchange and completion are different stages. Exchange is when you become legally committed to the purchase. Completion is when the money is needed and the property changes hands. If you exchange contracts and your mortgage offer later expires before completion, you could face serious financial and legal problems.

Speak to your solicitor before exchange if there is any doubt about whether the mortgage offer will remain valid through completion.

Can a mortgage offer expire?

Yes. A mortgage offer can expire if completion does not take place before the expiry date.

If that happens, the lender may consider one of the following routes:

Do not assume an offer will be extended just because the delay is outside your control. A slow chain, delayed searches or a late leasehold management pack may explain the problem, but the lender still decides whether it is prepared to extend or reassess.

Is a mortgage offer only valid for three months?

Not necessarily. Some mortgage offers may be valid for around three months, while others may be valid for around six months or, in some cases, longer. New-build and remortgage offers can also have different rules depending on the lender.

The only safe answer is the expiry date on your offer document.

This matters because two borrowers can receive offers from different lenders in the same week and have different deadlines. Even with the same lender, offer validity may vary by product type, property type or application route.

If you are buying a property with a long expected completion date, such as a new-build home, check the lender’s policy before applying. Applying too early can create avoidable expiry pressure later.

What should you check as soon as the offer arrives?

When your mortgage offer is issued, do not just file it away. Check the timing straight away.

Use this checklist:

• What is the exact offer expiry date?
• Does the offer say when the validity period started?
• Are there any special conditions you must satisfy before completion?
• Is the expected completion date comfortably before the expiry date?
• Is there a property chain that could delay completion?
• Is the property leasehold, shared ownership, new-build or otherwise more complex?
• Are searches, enquiries, title issues or management packs outstanding?
• Are you planning any job, income, credit or deposit changes before completion?
• Has your solicitor confirmed whether exchange is safe from a mortgage timing perspective?

James Blackler at The Mortgage Blog recommends checking the expiry date as soon as the offer arrives, rather than waiting until the chain slows down. The earlier a timing issue is spotted, the more options there are likely to be.

If your offer is close to expiring, make a finance enquiry and we can help you understand the likely routes before you commit to exchange or a fresh application.

What can delay completion before a mortgage offer expires?

Mortgage offers often expire because the transaction takes longer than expected, not because the borrower did anything wrong.

Common causes include:

• property chain delays
• slow legal enquiries
• search delays
• leasehold management packs taking longer than expected
• title defects or restrictions
• gifted deposit paperwork
• valuation queries
• new-build construction delays
• outstanding planning, building regulation or warranty information
• changes to the purchase price
• changes to employment, income or credit commitments

GOV.UK’s guidance on buying a home explains the broad buying stages, including preparing to buy, making an offer, arranging a mortgage, instructing a conveyancer, exchanging contracts and completing. Your mortgage offer needs to remain valid through to completion, not just through to exchange.

Leasehold cases can be slower because extra information may be needed from the freeholder or managing agent. GOV.UK’s leasehold property guidance is a useful starting point if you are unsure why leasehold paperwork can take time.

What should you do if your mortgage offer is close to expiring?

If completion might happen after the expiry date, act early. Do not wait until the final few days.

A sensible order is:

1. Check the offer document for the exact expiry date and any conditions.
2. Ask your solicitor for the realistic completion position, not just the hoped-for date.
3. Tell your broker or lender if the date may slip beyond the offer period.
4. Gather updated documents in case the lender asks for them.
5. Avoid exchange until the mortgage position is clear and your solicitor has advised you.
6. Compare fallback options if the extension route looks uncertain.

The lender may ask for updated payslips, bank statements, accounts, credit information, valuation checks or confirmation from the solicitor. Requirements vary.

If the delay is short and your circumstances have not changed, the process may be simpler. If your income, credit profile, deposit, property or lender criteria have changed, the lender may need to reassess more of the case.

A common trap: the offer covers exchange, but not completion

Imagine a buyer purchasing a leasehold flat in a chain. Their mortgage offer expires on 30 June and everyone is aiming to exchange in mid-June with completion “a couple of weeks later”. On paper, that may feel close enough. In practice, it is a timing risk.

The issue is not whether the offer is valid on the day contracts are exchanged. The mortgage funds are needed for completion. If the managing agent is slow to answer leasehold enquiries, or one party in the chain asks for a later completion date, the agreed completion date could easily move beyond the offer expiry.

A broker would usually want to know three things before the buyer relies on that offer:

• Has the solicitor confirmed a realistic completion date, not just the estate agent’s target?
• Will the lender consider an extension, and what updated checks might be needed?
• Has anything changed since the offer was issued, such as income, credit commitments, deposit source or the property information?

The practical lesson is to treat a near-expiry offer as a decision point, not an admin detail. If exchange happens before the mortgage position is clear, the buyer may be legally committed to complete without confirmed funding on the required date. The safer route is to raise the expiry issue early, prepare updated payslips, bank statements and deposit evidence, and ask the solicitor not to advise exchange until the lending position is understood.

Can a lender decline or withdraw after issuing a mortgage offer?

A mortgage offer is a formal offer, but it is still subject to the offer conditions and the lender’s requirements being met before completion.

A lender may need to reconsider the case if something important changes before completion, for example:

• you change jobs
• you move from employment to self-employment
• your income reduces
• you take on new credit
• you miss payments or your credit position changes
• your deposit source changes
• the purchase price changes
• the property valuation changes
• the property condition or legal title raises concerns
• information in the application turns out to be incomplete or inaccurate

public guidance explains that lenders assess whether you can afford a mortgage, including income and outgoings, as part of the mortgage process. You can read more in public guidance’s guide to choosing a mortgage and getting advice.

The FCA also provides consumer information about financial products and regulated firms at fca.org.uk/consumers.

The important point is simple: if something material changes before completion, ask before assuming the original offer still works.

Mortgage offer timing risk matrix

Use this table to judge how urgent your situation may be.

This is not a substitute for advice, but it helps you spot when timing has become a real decision rather than an admin detail.

What documents might you need for an extension or new offer?

If a lender is prepared to consider an extension, it may still want updated evidence. Keep the following ready:

For self-employed borrowers, GOV.UK’s Self Assessment tax return guidance may be relevant to the documents lenders ask for, although each lender sets its own evidence requirements.

How mortgage offer timing differs by situation

Standard purchase

If you receive an offer in March and it expires in September, with completion expected in June, timing may be comfortable. You still need to meet the offer conditions and avoid material changes before completion.

Purchase in a chain

If your offer expires in four weeks and the chain is not ready, speak to your solicitor and broker straight away. You need a realistic completion date, not a hopeful one. The lender may consider an extension, but you should not assume it will.

New-build purchase

New-build completion dates can move. Some lenders have specific new-build validity or extension rules. If the build date slips, ask early whether the current offer can be extended or whether a fresh application may be needed.

Before applying for a new-build mortgage, ask how long the offer will last and what happens if the developer’s timetable changes.

Remortgage

A remortgage offer may be arranged months before your current deal ends. Timing matters because completing too early could trigger an early repayment charge on your existing mortgage, while completing too late could mean the new offer expires or you spend time on your lender’s reversion rate.

If you are comparing options, our guide on how long it takes to get a mortgage may help you plan the wider timetable.

Scotland

The Scottish buying process differs from England and Wales, particularly around offers, missives and legal commitment. public guidance has a useful buying property in Scotland timeline. If you are buying in Scotland, align the mortgage timing with your solicitor’s advice on the legal timetable.

Auction or tight-deadline purchase

Auction purchases can involve strict completion deadlines. A standard mortgage may not be fast enough in some cases, particularly if the property is unusual, needs work or has title issues. Do not rely on a general mortgage offer timescale for an auction purchase.

Should you apply early to secure an offer?

Sometimes applying early is sensible. Sometimes it creates avoidable pressure.

The right answer depends on:

• how certain the completion date is
• whether the property is ready to proceed
• whether the chain is complete
• whether the property is new-build
• whether your income or credit position may change
• whether rates or product availability are a concern
• whether the lender’s offer validity is long enough for the expected timetable

Applying early can give you certainty on the lender’s initial view, subject to conditions. But if completion is a long way off, the offer may expire before you need the funds.

This is a planning question, not just a rate question.

What mistakes make mortgage offer expiry harder to manage?

The most common mistake is assuming the lender will automatically extend the offer.

Other pitfalls include:

How could the expiry date affect your costs?

If your offer expires and you need a new route, costs can change. Depending on the case, there may be:

• a different interest rate
• a different product fee
• another valuation fee
• extra legal work
• a change in monthly payment
• broker fees, depending on your agreement
• delay costs in the wider transaction
• an early repayment charge issue on a remortgage

Not all fees are refundable. Check your mortgage illustration, offer document and any broker or solicitor fee agreement before assuming what you would get back.

When should you speak to a broker?

Speak to a broker as early as possible if:

• your offer expires within the next one to two months
• the expected completion date is uncertain
• the property chain is moving slowly
• you are buying a new-build home
• your solicitor has raised title, leasehold or valuation issues
• your income, employment, credit or deposit has changed
• you are considering exchange before the mortgage position is confirmed
• you may need to switch lender
• your remortgage timing is close to your current deal end date

A broker can help you understand:

• whether the lender may consider an extension
• what updated documents may be required
• whether a new product or application could be needed
• whether your circumstances have changed in a way that affects the offer
• how the expiry date interacts with exchange and completion
• whether another lender route is realistic
• what questions to raise with your solicitor before exchange

James Blackler explains that the right question is rarely just “can we ask for an extension?” The better question is whether the extension route is reliable enough for the transaction timetable, and whether anything has changed that could weaken the case.

You can speak to a mortgage adviser if you want help reviewing the timing and options. We cannot guarantee an extension or approval, but we can help you make a more informed decision before you act.

What should you prepare before asking for help?

Before contacting a broker, prepare a short summary:

• lender name
• mortgage offer expiry date
• offer issue date
• property address and purchase price
• expected completion date
• reason for any delay
• whether exchange has happened
• whether your income, employment, deposit or credit position has changed
• whether the property is leasehold, new-build, shared ownership or otherwise unusual
• solicitor’s latest update
• any deadline from the seller, developer or chain
• your preferred outcome and your fallback position

You should also have recent payslips, bank statements, deposit evidence, ID and proof of address available in case the lender asks for updated information.

What should you read next?

You may also find these guides useful:

• How long does it take to get a mortgage?
• Speak to a mortgage adviser
• Make a finance enquiry
• Quick guide to UK mortgage types
• Mortgage with no early repayment charge
• What is a lock-in agreement?
• What is an offset mortgage?
• Buying another property with a second mortgage
• Buying an investment property as your first home
• Buying property through a limited company vs personal name
• Property finance hurdles in the UK
• 7 reasons to use a property search agent

FAQs

How long does a mortgage offer last in the UK?

A mortgage offer lasts until the expiry date shown on the offer document. Many offers are valid for around three to six months, but lender rules vary. Always rely on the date in your own offer.

Does the mortgage offer run from application or from offer issue?

It depends on the lender. Some calculate validity from the application date, while others use the offer issue date or another point in the process. Check your offer document or ask your broker or lender.

Can a mortgage offer be extended?

It may be possible, but it is not guaranteed. The lender may ask for updated documents or reassess parts of the case. Ask early if completion may fall after the expiry date.

What happens if my mortgage offer expires before completion?

You may need an extension, a re-offer or a new application. The lender may reassess affordability, credit, valuation, property details and documents. You should speak to your broker and solicitor before exchange if expiry is a risk.

Can a lender withdraw a mortgage offer?

A lender may reconsider the offer if conditions are not met or if important information changes before completion. This can include changes to income, employment, credit, deposit source, property value or legal title.

Should I exchange contracts if my mortgage offer is close to expiring?

You should take legal advice before exchange. If your offer may not be valid at completion, exchanging can create serious financial risk. Your solicitor advises on the legal risk, while your broker can help with the mortgage position.

Are new-build mortgage offers valid for longer?

Some lenders have specific new-build offer validity or extension policies, but this varies. New-build buyers should check the lender’s rules before applying and again if the build timetable changes.

Does a decision in principle expire in the same way?

A decision in principle or agreement in principle is not the same as a full mortgage offer. It is usually an early indication based on limited information and is not a guarantee that the lender will lend.

Can I change jobs after receiving a mortgage offer?

A job change may affect the lender’s assessment. Some changes are manageable, but the lender may need updated evidence. Speak to your broker before making a major employment change if completion has not happened.

Can I take out new credit before completion?

It is usually sensible to avoid unnecessary new borrowing before completion. New credit can affect affordability and your credit profile, and may need to be disclosed to the lender.