Is your mortgage offer due to expire before you can complete your property purchase? Do not assume that the lender will automatically give you more time. Some lenders consider extensions, but their rules differ and an extension is not guaranteed. The best first move is to check your actual offer expiry date, establish why completion is delayed, and speak to your mortgage broker and conveyancer promptly.
It is particularly important to act early if you are buying a new-build property, are caught in a chain, or have already exchanged contracts. The right solution depends on your lender, your circumstances and how close you are to completion.
1. Check the expiry date on your formal mortgage offer
An agreement in principle is not the same as a formal mortgage offer. The formal offer follows the lender’s underwriting and property assessment, and it should state how long its terms remain available. Validity periods vary by lender, product and property type. Do not rely on a general rule such as “all offers last six months”.
For example, Nationwide’s published intermediary criteria, checked on 25 October 2026, show different offer periods for house purchases and new-build purchases, together with specific timing rules for requesting an extension. That is one lender’s policy, not an industry-wide promise. Your own offer letter and lender’s current criteria take precedence.
2. Find out what is delaying completion
Your broker needs more than “the solicitors are taking a while”. Ask the conveyancer for a clear explanation of what remains outstanding and a realistic view of when completion could happen. Common issues include:
- an incomplete property chain or a related sale that has not progressed;
- outstanding title enquiries, leasehold documentation or management information;
- valuation or property-condition questions requiring further evidence;
- a new-build property not being ready by the expected date; or
- an unresolved legal or funding issue affecting exchange or completion.
If contracts have already been exchanged, tell your conveyancer immediately about any risk to the mortgage funding date. Missing a contractual completion date can have serious consequences. Your conveyancer, not a blog article, should advise you on those legal risks.
3. Ask about an extension before the offer expires
Many lenders will consider extending a valid mortgage offer when there is a credible reason for the delay, but they are not obliged to agree. Contact your broker as soon as a delay becomes likely, even if the lender’s formal extension application window has not yet opened.
Be prepared to explain the reason for the delay and provide a realistic completion estimate. The lender may request updated payslips, accounts, bank statements, details of outstanding borrowing, a credit check or a fresh valuation. Exactly what is needed depends on its policy and whether your circumstances or the property have changed.
Do not assume the original mortgage rate or other terms will be preserved. Ask your broker to confirm in writing what an approved extension would mean for your particular mortgage.
4. Tell your broker if anything important has changed
A lender may need to reassess affordability or eligibility if there has been a material change since it issued the offer. Examples could include a job change, lower income, new credit commitments, a change in deposit or an issue affecting the property. Self-employed borrowers and company directors may also be asked for more recent evidence of earnings or business performance.
Be accurate and proactive. Withholding material information can create a more serious problem than the delay itself. If your income is complex, our self-employed and company director mortgage guidance explains how different lenders may assess it.
5. Understand the alternatives if the lender cannot extend
If an extension is declined or the offer has already expired, a fresh mortgage application might be necessary. This could be with the original lender or another lender, depending on the available products and your circumstances. There is no guarantee of approval or that a previous rate will remain available.
A new application can mean revised affordability checks, additional documentation, a new credit search, a valuation and further fees or legal work. A different lender may also take time to reach an offer. Your broker should assess these trade-offs before a decision is made; do not make a last-minute application assuming it will necessarily rescue the transaction.
6. Take extra care if you are buying a new build
New-build completion dates can move while legal commitments have already been made. Ask the developer for an updated construction and handover timetable, and ask your conveyancer to explain any relevant contract deadlines. Your broker can then check whether your offer period, any new-build-specific policy and the expected completion date are compatible.
If you already own a property and are moving to a new build, you may also need to coordinate a sale, mortgage redemption and completion funds. Read our guide to buying a new-build home when you already own a property.
What should you have ready when you contact a mortgage broker?
Have your lender’s name, the formal offer expiry date, the expected completion date, the reason for the delay, whether you have exchanged contracts, and an outline of any important changes to your income or borrowing since the offer was issued. This lets an adviser focus on the practical choices rather than repeat the whole process from the beginning.
Frequently asked questions
Can I complete after my mortgage offer expires?
Do not assume so. Your solicitor and lender need to confirm that valid mortgage funding will be available for the intended completion date. An expired offer may require an extension, a reissued offer or a new application.
Will an extension protect my original mortgage rate?
Not necessarily. The rate and other terms depend on what your lender agrees and confirms. Ask for the extension terms in writing.
How soon should I ask for an extension?
Speak to your broker as soon as a delay becomes likely. Formal request windows vary: some lenders only accept extension requests close to the expiry date, while others have different procedures. Acting early gives everyone time to identify the correct route.
What if I have already exchanged contracts?
Contact your conveyancer urgently if completion funding may be affected. Your legal commitments and the consequences of a delayed completion require specific legal advice.
Need help with an expiring mortgage offer?
If your mortgage offer is running out and you are not sure whether your purchase can complete in time, TLA Finance can review the circumstances and discuss the mortgage options that may be available, subject to lender criteria and a full assessment. We cannot promise an extension, a particular rate or a successful application.
Contact TLA Finance or call 01494 325625. You can also explore our mortgage services for buyers and homeowners.
Important information: This article provides general information, not personal mortgage or legal advice. Lender policies can change. Your home may be repossessed if you do not keep up repayments on your mortgage. TLA Finance Ltd is authorised and regulated by the Financial Conduct Authority (FRN 304214).
References checked 25 October 2026: MoneyHelper: How long do mortgage offers last?; Nationwide for Intermediaries: Essential criteria. Always check the lender’s current policy for your own case.
