How Long Do Mortgage Offers Last?

A mortgage offer does not last forever.

Most mortgage offers are valid for a fixed period, often around three to six months, although some offers may last longer depending on the lender, product and property type.

The exact expiry date will be shown in your mortgage offer letter.

Understanding that date matters, especially if you are in a property chain, buying a new-build home, waiting for legal work to finish, or dealing with delays outside your control.

A mortgage offer can feel like the final hurdle, but it is not the end of the process. You still need to complete before the offer expires, or arrange an extension where the lender allows it.

👉 Check your mortgage options early if timing, chains or completion delays could be an issue.

What is a mortgage offer?

A mortgage offer is the lender’s formal confirmation that it is prepared to lend you the money for a specific property, subject to the terms of the offer.

It is different from an agreement in principle or decision in principle.

An agreement in principle is an early indication of what you may be able to borrow.

A full mortgage offer is issued after the lender has assessed the full application, property, valuation, income, affordability and supporting documents.

Once the mortgage offer is issued, your solicitor or conveyancer can usually move towards exchange and completion.

However, the offer is only valid for the period stated by the lender.

How long do mortgage offers usually last?

Mortgage offer lengths vary by lender.

Many standard residential mortgage offers last around three to six months.

Some lenders may offer longer validity periods, especially for certain new-build cases where completion can take longer.

Your offer letter will show the exact expiry date.

Do not rely on general rules or what someone else was offered.

The important date is the date on your own offer.

When does the mortgage offer period start?

The mortgage offer period usually starts from the date the lender issues the formal mortgage offer.

It does not usually start from:

  • the date you got an agreement in principle
  • the date you first spoke to a broker
  • the date you made an offer on the property
  • the date you submitted the mortgage application
  • the date your valuation was booked

This matters because delays before the mortgage offer is issued do not usually eat into the offer validity period.

But delays after the offer is issued do.

Once the offer is issued, the countdown to expiry begins.

Where can you find your mortgage offer expiry date?

Your mortgage offer expiry date should be shown in the mortgage offer document.

It may be described as:

  • offer expiry date
  • valid until date
  • completion deadline
  • offer valid to
  • date by which funds must be drawn down

If you are unsure, ask your broker, lender or solicitor to confirm it in writing.

Do not guess.

It is worth putting the expiry date in your calendar and checking progress regularly.

What happens if your mortgage offer expires before completion?

If your mortgage offer expires before completion, the lender is no longer bound to lend under that offer.

That does not always mean the purchase is dead, but it can create problems.

A few things may happen.

The lender may agree to extend the offer

Some lenders may agree to extend a mortgage offer.

This is usually more likely if:

  • the delay is explainable
  • your circumstances have not changed
  • the property is still acceptable
  • affordability still works
  • your credit position has not worsened
  • completion is expected soon
  • the extension is requested before the offer expires

Extensions are not guaranteed.

The lender may ask for updated documents or carry out new checks before agreeing.

You may need a partial reassessment

Some lenders may not require a full reapplication but may still want updated information.

They may ask for:

  • recent payslips
  • updated bank statements
  • confirmation of employment
  • updated credit check
  • updated valuation
  • confirmation that circumstances have not changed
  • solicitor update
  • new-build completion update

This can still delay the process.

The earlier you raise the issue, the better.

You may need to reapply

If the lender will not extend the offer, you may need to reapply.

That can be risky because:

  • mortgage products may have changed
  • interest rates may be different
  • lender criteria may have changed
  • affordability may be reassessed
  • credit checks may be repeated
  • your income or outgoings may be reviewed again
  • the property may need another valuation

A reapplication is not always a problem, but it is not something to treat casually.

The new application may not produce the same result as the original one.

Could you lose your original mortgage rate?

Yes, you could.

If the original offer expires and you need a new mortgage application or new product, you may not be able to keep the same rate.

That matters if rates have increased since your original offer.

Even a small rate difference can affect monthly payments.

This is one of the main reasons offer expiry needs to be managed carefully.

Can a mortgage offer be extended?

Yes, in some cases a mortgage offer can be extended.

But this depends on the lender.

A lender may offer:

  • a short extension
  • a longer extension for new-build cases
  • an extension after updated checks
  • an extension only if completion is close
  • no extension at all

Some lenders may keep the same rate during an extension.

Others may require a new product or reassessment.

You should ask about the extension process before the offer expires, not after.

How early should you request a mortgage offer extension?

It is best to act as soon as you know there may be a delay.

Do not wait until the final week if the chain, builder or solicitor is already warning that completion may slip.

A sensible approach is to flag the issue several weeks before expiry where possible.

Your broker or lender can then explain:

  • whether an extension is available
  • what documents are needed
  • whether the rate can be kept
  • whether a new credit check is required
  • whether affordability will be reassessed
  • whether a new valuation is needed

Leaving it late can reduce your options.

Common reasons mortgage offers expire

Mortgage offers often expire because the purchase takes longer than expected.

Common causes include:

  • property chain delays
  • slow conveyancing
  • delayed searches
  • survey problems
  • valuation issues
  • title defects
  • leasehold issues
  • management pack delays
  • new-build construction delays
  • gifted deposit checks
  • changes in buyer circumstances
  • seller delays
  • solicitor queries
  • mortgage conditions not being satisfied
  • exchange taking longer than expected

Many of these delays are outside your direct control.

That is why monitoring the offer expiry date matters.

New-build mortgage offers

New-build purchases often need extra care.

This is because the property may not be finished when the mortgage offer is issued.

If completion is delayed, your offer could expire before the home is ready.

Some lenders offer longer mortgage offer periods for new-build purchases.

Others offer extensions where certain conditions are met.

But not all lenders handle new-build timing in the same way.

If you are buying a new-build property, lender choice matters from the start.

You need to think about:

  • expected build completion date
  • long-stop date
  • reservation deadline
  • exchange deadline
  • offer validity
  • extension policy
  • whether the lender supports new-build delays
  • whether revaluation may be needed
  • whether rates could change before completion

Choosing a lender with an unsuitable offer length can create unnecessary risk.

Off-plan purchases and long delays

Buying off-plan can be more complicated because completion may be many months away.

The property may not be ready by the original expected date.

Delays can happen because of:

  • construction issues
  • planning conditions
  • utility connections
  • developer delays
  • inspection delays
  • building control
  • legal pack issues
  • chain timing

If you are buying off-plan, check whether the lender’s offer length fits the expected completion timescale.

Do this before applying, not after the offer is issued.

Can your circumstances change after a mortgage offer?

Yes, but important changes can affect the mortgage.

A mortgage offer is based on the information the lender assessed at the time.

If something material changes before completion, you may need to tell the lender.

Examples include:

  • changing job
  • losing your job
  • income reducing
  • becoming self-employed
  • taking out new credit
  • missed payments
  • new defaults or CCJs
  • major change in deposit source
  • separating from a joint applicant
  • changing the property or purchase price
  • change in residency or visa position
  • change in dependants or commitments

The lender may then reassess the application.

In some cases, the offer may still stand.

In others, the lender may change, suspend or withdraw the offer.

What changes usually do not matter?

Normal day-to-day spending does not usually cause a problem on its own.

For example:

  • normal food shopping
  • regular bills
  • everyday living costs
  • small changes in bank balance
  • usual household spending

The risk is usually a major financial or employment change, not normal life.

That said, avoid taking unnecessary financial risks before completion.

Can a lender withdraw a mortgage offer?

Yes, a lender can withdraw a mortgage offer in certain circumstances.

This may happen if:

  • information on the application was wrong
  • your circumstances changed materially
  • fraud or misrepresentation is suspected
  • the property valuation changes
  • the property is no longer acceptable
  • affordability no longer works
  • credit issues arise before completion
  • mortgage conditions are not met
  • the offer expires
  • the lender discovers something that changes the risk

A mortgage offer is a strong step forward, but it is not a guarantee regardless of what happens next.

Should you take new credit after a mortgage offer?

It is usually best to avoid taking new credit before completion unless you have checked the impact.

New credit can affect affordability and credit scoring.

This includes:

  • car finance
  • personal loans
  • credit cards
  • buy now pay later
  • large overdraft use
  • finance agreements
  • furniture finance

Even if the mortgage offer has already been issued, a lender may carry out further checks before completion.

Taking new debt can create unnecessary risk.

Can you change mortgage product before completion?

Sometimes, yes.

You may want to change product before completion if rates have fallen or a better deal becomes available.

This depends on the lender and timing.

Some lenders allow product switches before completion.

Others may require a new application or reassessment.

If you are thinking about changing product, check carefully before doing anything.

For more detail, read can you change mortgage product before completion?.

What if your mortgage application is declined before offer?

If your application is declined before a formal offer is issued, the issue is different.

A decline can happen because of:

  • affordability
  • credit history
  • income evidence
  • property valuation
  • deposit source
  • lender criteria
  • documents not matching
  • employment status
  • self-employed income
  • bank statement concerns

A decline does not always mean no mortgage is possible.

It may mean the wrong lender was chosen.

For more detail, read what happens if a mortgage application is declined?

What if you separate during a mortgage application?

Separation during a mortgage application can cause major complications.

If you are applying jointly and your relationship changes before completion, the lender needs to know.

The application may need to be reassessed.

The lender may check whether one applicant can proceed alone, whether the deposit position changes, and whether affordability still works.

For more detail, read what happens if you separate during a mortgage application?

How to reduce the risk of mortgage offer expiry

You cannot control every delay, but you can reduce the risk.

Helpful steps include:

  • choose a lender with a suitable offer length
  • check new-build policies early
  • keep your broker updated
  • instruct solicitors quickly
  • respond to document requests quickly
  • monitor the chain
  • chase searches and legal enquiries
  • avoid new borrowing
  • avoid job changes where possible
  • keep bank statements sensible
  • flag delays early
  • request extensions before expiry
  • keep all mortgage documents organised
  • ask about product switch options if rates change

The key is not just getting the offer.

It is managing the offer until completion.

How a broker can help with mortgage offer timing

A broker can help by:

  • choosing lenders with suitable offer periods
  • checking new-build extension policies
  • monitoring offer expiry dates
  • requesting extensions early
  • explaining what documents may be needed
  • checking whether a product switch is possible
  • advising whether reapplication is risky
  • helping avoid unnecessary credit checks
  • keeping the application moving

Offer-expiry problems are often avoidable with early planning.

👉 Speak to a broker if your mortgage offer timing could be tight.

Realistic example

A buyer receives a mortgage offer valid for six months.

The property is in a chain, and the legal process takes longer than expected because of leasehold enquiries.

At month five, completion still has not been agreed.

If the buyer does nothing, the offer may expire before completion.

If the broker is involved early, the lender can be contacted, an extension can be discussed, and updated documents can be prepared if needed.

That does not guarantee the extension, but it gives the buyer more options.

Timing matters.

Related guides for mortgage applications and offers

If you are in the mortgage application or offer stage, these guides may also help:

These guides work together because mortgage-offer problems often involve timing, affordability, income evidence, property checks, legal delays, product choice and changes in circumstances.

FAQs about mortgage offer expiry

How long does a mortgage offer last?

Many mortgage offers last around three to six months, but the exact length depends on the lender, product and property type.

Where do I find my mortgage offer expiry date?

Your mortgage offer letter should show the expiry date or the date by which funds must be drawn down.

Does the offer period start from application or offer date?

It usually starts from the date the formal mortgage offer is issued, not the application date.

Can I extend a mortgage offer?

Sometimes. Some lenders offer extensions, but they are not guaranteed and may require updated checks.

How early should I request a mortgage offer extension?

As early as possible once you know completion may be delayed. Waiting until the final few days can reduce your options.

What happens if my mortgage offer expires?

You may need an extension, reassessment or a new application. You may also lose the original product or rate.

Do new-build mortgage offers last longer?

Some lenders offer longer validity or extension options for new-build purchases, but criteria varies.

Can a mortgage offer be withdrawn?

Yes, in certain circumstances, such as material changes, incorrect information, affordability concerns or property issues.

Can I change mortgage product before completion?

Sometimes. It depends on the lender, product availability and whether further checks are needed.

Should I avoid new credit after a mortgage offer?

Usually, yes. New credit can affect affordability and may create problems before completion.

Bottom line

A mortgage offer is an important milestone, but it has an expiry date.

Most offers last for a fixed period, and completion needs to happen before that date unless the lender agrees to extend.

The biggest risks are delays, new-build completion problems, changes in circumstances, new credit, property issues and assuming the offer is guaranteed no matter what happens.

Handled properly, offer timing can usually be managed.

Handled badly, expiry can lead to reapplication, new checks, a lost rate or even a failed purchase.

The safest approach is to know your expiry date, keep everyone updated, avoid unnecessary financial changes and raise delays early.

👉 Check your mortgage options today — free, quick and no obligation.