Last reviewed: June 2026
TL;DR- Standard residential mortgage offers are typically valid for 3-6 months from the date of issue.
- New build mortgage offers are often extended to 6-12 months to accommodate construction delays.
- If the offer expires before completion, the borrower must reapply - the new application is subject to current criteria and rates, which may differ from the original offer.
- Extensions to expiring offers can often be requested before expiry - most lenders grant short extensions without requiring a full reassessment where circumstances have not changed.
Standard Mortgage Offer Validity
A mortgage offer sets out the lender's commitment to lend on specified terms for a defined period. For standard residential mortgage purchases, offer validity is typically 3-6 months from the date the offer is issued. The specific period is stated in the offer document. If exchange of contracts and completion do not occur within the validity period, the offer expires and a new application is required.
The validity period is from the date of the offer, not from the date of application. If the application process took 6 weeks and the offer is valid for 3 months, the total time available from application to completion is approximately 18 weeks. This should be considered when planning the timeline for a property purchase, particularly in markets where conveyancing may be slow.
New Build Mortgage Offer Extensions
New build properties are often purchased off-plan, with completion occurring when construction is finished - which may be 6-18 months after the exchange of contracts and the mortgage offer. Most lenders recognise this and extend new build mortgage offer validity to 6-9 months, with some offering 12 months or more on request. Extended validity periods for new builds should be confirmed with the lender before exchange, as construction delays are common and a shorter-than-expected offer validity can create significant problems.
Extending an Expiring Offer
Where a mortgage offer is approaching its expiry date and completion has not yet occurred, most lenders will grant a short extension without requiring a full reassessment - provided the borrower's circumstances have not materially changed and the property has not changed. Extensions of 1-3 months are typically available on request. The lender may ask for confirmation that circumstances are unchanged (income, employment, credit) before granting the extension. Extensions should be requested before the offer expires - it is much harder to reinstate an expired offer than to extend a current one.
When the Market Changes Between Offer and Completion
The mortgage offer locks in the rate and terms for the offer's validity period. If interest rates fall between the offer and completion, the borrower is locked into the higher offered rate (unless the product allows switching before completion - some lenders permit this). If rates rise, the borrower benefits from having locked in the lower offered rate. If the offer expires before completion due to delays and rates have risen in the interim, a new application at current (higher) rates is required.
Frequently Asked Questions
What happens if my circumstances change after the offer is issued?
Material changes in circumstances (job loss, change of employment, significant increase in debt, adverse credit events) must be disclosed to the lender. If the change is material, the lender may withdraw or amend the offer. The borrower should not rely on the existing offer remaining valid if significant negative changes have occurred. Failing to disclose material changes is mortgage fraud.
Can I change the property after receiving a mortgage offer?
A mortgage offer is property-specific - it is made on the basis of the specific property assessed in the valuation. If the property changes (for example, if the purchase falls through and the borrower wants to purchase a different property), a new application is typically required. The rate and terms from the original offer do not automatically transfer to a new property. Some lenders allow the product to be transferred to a new property if the LTV and property type are similar, but this must be agreed with the lender.
How far in advance can I apply for a mortgage offer?
Applications for a mortgage offer can be submitted once a property has been identified and an offer accepted. The offer is then valid for the defined period from the date of issue. There is no benefit in applying for a mortgage offer significantly in advance of having a property to purchase - the offer will expire if unused. An AIP (agreement in principle) can be obtained in advance of finding a property as an indicator of borrowing capacity without triggering a formal offer timeline.
Does the mortgage offer expire if I pull out and want to reuse it for another property?
If a purchase falls through after an offer has been issued, the offer expires at its validity date. If the borrower subsequently finds another property within the remaining offer validity period, they can ask the lender whether the offer can be transferred to the new property (subject to a new valuation and property eligibility check). Whether the lender will permit this and on what terms varies - there is no automatic right to transfer the offer to a new property.
