Mortgage Offer Validity: How Long Is Your Offer Effective?

Receiving a formal mortgage offer is a significant milestone in any UK property purchase, but it comes with an expiry date that many buyers overlook. The gap between offer and legal completion can stretch for weeks or months, making it essential to understand exactly how long your lender's commitment is valid — and what happens if time runs out.

Key points

• Most UK mortgage offers carry a validity period of six months from the date of the formal offer letter.
• Remortgage offers are often shorter — commonly three months — reflecting the simpler legal process involved.
• The six-month clock starts on the offer date, not when you submitted your application; processing delays do not pause it.
• Lenders can withdraw an offer before the expiry date if your financial circumstances change materially, such as losing employment or taking on significant new debt.
• A one-off extension of one to three months can usually be requested, but approval is at the lender's discretion and may involve updated income verification.

How long does a mortgage offer typically last?

For a standard residential purchase in the UK, a mortgage offer is usually valid for six months from the date shown on the offer letter. This window is designed to accommodate the typical conveyancing timeline — searches, survey, exchange, and completion — but it is not indefinite.

Remortgage offers tend to have a shorter validity period, often three months, because no property purchase chain is involved and the legal steps are fewer.

Indicative UK guidance, last reviewed 2026-05-30. Always confirm your specific validity period with your lender or mortgage broker.

When does the validity period start?

A common point of confusion is whether the clock begins from your mortgage application date or your mortgage offer date. It starts from the offer date — the date printed on the formal mortgage offer document sent by your lender.

In practice, there is often a gap of two to eight weeks between submitting your application and receiving the formal offer, depending on the lender's workload, your document submission speed, and valuation scheduling. Those weeks are not counted against your validity window — but neither are they a bonus to spend freely. Once you receive the offer, notify your solicitor or conveyancer promptly so they can factor the expiry date into the completion plan.

What should you do if your mortgage offer is about to expire?

If your completion date looks likely to fall outside the offer validity window, act early — do not wait for the expiry date to pass. Your main options are:

Request an extension

Most lenders will grant a one-off extension of one to three months if you contact them before the offer expires. You will usually need to provide:

• Updated payslips or proof of income (typically the most recent one to three months)
• A reason for the delay — for example, a slow chain, outstanding search results, or a developer notifying a later build completion date
• Confirmation that your financial circumstances have not changed materially

Extensions are not automatic. Some lenders process them as a simple administrative step; others require a new affordability check.

Reapply if the offer has already expired

If your offer has already lapsed, you will need to submit a fresh application. This typically means:

• A new credit check (which leaves a hard enquiry on your credit file)
• Updated financial documents — payslips, bank statements, and tax returns if self-employed
• A new mortgage offer at whatever interest rate is current at the time of reapplication

If rates have risen since your original offer, this can significantly affect your monthly repayments.

Consider switching lenders

An expired offer can also be an opportunity to reassess the market. If rates have fallen since your original application, switching lenders — while adding time to the transaction — could save money over the mortgage term. A whole-of-market mortgage broker can compare current products efficiently.

Mortgage offer validity for new-build properties

New-build purchases frequently involve build delays, meaning buyers may wait six months or more between reserving a plot and receiving the keys. Recognising this, some lenders offer extended validity periods of up to nine or twelve months for new-build purchases.

Not all lenders provide this automatically — you may need to request a specific new-build mortgage product or have your broker identify lenders with longer standard periods. If a delay is notified by the developer, contact your lender as soon as possible and document all correspondence in writing.

Which option should you choose?

• Request an extension if your offer has not yet expired and the delay is due to a chain, legal, or developer issue rather than a change in your personal finances.
• Reapply if your offer has expired and your financial circumstances are the same or stronger than at the time of your original application.
• Speak to a whole-of-market mortgage broker if your circumstances have changed, rates have moved significantly, or you are unsure whether reapplying or extending is the better route.
• Ask about new-build extension products at the outset if you are buying a new-build — this is far easier to arrange before delays begin than after.

When to get professional help

Most offer validity questions can be resolved with a direct call to your lender or mortgage broker. Seek professional guidance if:

• Your financial circumstances have changed significantly since your original application — such as a change of employer, reduced income, or new credit commitments.
• Your offer has expired and you are uncertain which lenders will accept a reapplication given an existing hard-search footprint on your credit file.
• You are in a new-build purchase and the developer has revised the build completion date to fall well beyond your current offer window.
• You are purchasing with a Help to Buy equity loan or shared ownership product, where scheme-specific deadlines may also apply.

How Housey can help

Housey connects UK buyers and homeowners with trusted property professionals across the full purchase journey. Whether you are planning your next steps, working through conveyancing timelines, or navigating a slow chain, Housey's guides and service finder can help you move forward with confidence at every stage.

Frequently asked questions

Does the mortgage offer validity start from application or offer date?

The validity period begins from the date on the formal mortgage offer letter, not the date you submitted your application. Processing times vary by lender and your circumstances, so there may be several weeks between application and offer. Once you receive your offer letter, note the expiry date and share it with your solicitor or conveyancer immediately.

Can a lender withdraw a mortgage offer before I complete?

Yes. A lender can withdraw a mortgage offer before completion if your financial circumstances change materially — for example, if you lose your job, take on significant new debt, or a credit check reveals a change in your credit profile. Some lenders re-check credit files in the weeks before completion, so avoid large purchases or new credit applications during this period.

What happens if my mortgage offer expires before completion?

If your offer expires, you will usually need to reapply. This typically involves a new credit check, updated payslips, and a fresh mortgage offer at whatever interest rate is current. In some cases lenders retain the same rate for returning applicants, but this is not guaranteed. Acting before the expiry date gives you the best chance of a smooth extension rather than a full reapplication.

Do new-build mortgage offers last longer?

Some lenders extend the standard validity period to nine or twelve months for new-build purchases, recognising that build delays are common. This varies by lender and product. If you are buying a new-build, confirm the validity period with your broker at the outset and ask specifically about new-build extension policies before committing to a lender.

Sources and further reading

• MoneyHelper: Buying a home — MoneyHelper (Money and Pensions Service)
• Citizens Advice: Buying a home — Citizens Advice