How long will your mortgage offer last? 

Most mortgage offers will last between three and six months. Different lenders will have their own criteria and expectations, and when you receive your formal offer (which differs from an agreement in principle), you’ll be told how long it remains valid for.  

But as mortgage brokers, we know that you’re not searching for the answer to “how long does a mortgage offer last” because you’re interested in lender timelines. You’re searching because you are worried that your house purchase is taking much longer than you expected, and you’re starting to panic. 

We completely get it; buying a house is stressful enough without worrying that your mortgage offer might expire before you collect the keys. 

That’s why we’ve written this blog to answer some of your common questions and put your mind at ease. We’ll explain how long mortgage offers last, who is responsible for keeping them valid, what to do if delays occur, and how to avoid finding yourself in a worst-case scenario. 

What is a mortgage offer and how long does it last? 

Before we get started, we want to clarify the difference between an Agreement in Principle (AIP – also known as a Decision in Principle, or DIP) and a formal mortgage offer. 

• An AIP is a provisional offer from a lender. It confirms how much they might lend you, subject to your finance checks and the property valuation. It is not a formal offer to lend you the money.  

• A mortgage offer is the official agreement from the lender that they will lend you the money, as long as the mortgage starts within a specific time frame. 

Each lender has their own criteria for how long a mortgage offer remains valid. You can expect it to last 3 to 6 months, although a mortgage offer for a new-build property may last longer because the lender understands that building delays can happen.  

Your mortgage offer’s expiry date will be clearly stated on your offer document.  

That is the date that matters to you, not the industry average.  

Why do different lenders have different offer periods? 

We know that your first question is going to be, “Why are not all mortgage offers valid for six months?” And it’s a good point, because we know that conveyancing takes a long time, so surely lenders should factor that in? 

The answer is that lenders are continually managing risk. We’ve all seen how interest rates can change dramatically during those six months, and so can the borrower’s circumstances. You might change jobs, start a family, switch from employment to self-employment; all of which can impact your affordability. Lenders also need to consider house price fluctuations and whether they could affect your LTV. 

A longer mortgage offer isn’t always better. Different lenders have different rules for extensions, product changes, and reapplications, so it’s important to look at the overall mortgage rather than the validity period alone. 

What can cause a mortgage offer to expire? 

Many things can cause a mortgage offer to expire. The most common reasons include slow conveyancing, complicated property chains, new-build delays, or problems discovered during conveyancing searches. Issues can also stem from delayed or missing paperwork, a change in circumstances, or a complicated credit history.  

As your mortgage broker, we’ll explain the pros and cons of your mortgage offer and make sure that you understand what applies to your specific application.  

Who is responsible for making sure my mortgage offer doesn’t expire? 

The UK government suggests buying a home takes an average of five months. But those timescales will depend on how complex the chain is – the more people involved, the longer it could take.  

We’d love to say your house purchase will complete before your mortgage offer expires, but unfortunately many variables could cause problems. The buyer has the most to lose if the offer expires before completion, so who is responsible for keeping the offer valid?  

We recommend a shared approach. As the buyer, you need to be up to date with all deadlines, but the other people involved (your mortgage broker, your solicitor and your estate agent) should also be working towards the same date.  

Mortgage brokers are responsible for: 

• Monitoring the progress of the purchase 

• Discussing extension options with buyers and lenders 

• Contacting lenders if delays occur and organising an extension where possible 

• Advising when action needs to be taken 

Solicitors are responsible for:  

• Understanding transaction timeline 

• Making clients (and the chain) aware of potential delays 

• Helping push matters towards exchange and completion 

Estate agents are responsible for: 

• Chasing progress up and down the chain 

• Encouraging other parties to move faster, including suggesting solutions to speed up the sale/purchase 

• But remember the estate agent has no control over the mortgage itself 

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

What you need to do depends on how close your mortgage offer is to expiring.  

You have up to 60 days until your mortgage offer expires… 

If you’ve got at least two months to go, then you don’t need to panic. But you do need to push your conveyancer and estate agent to check that the sale or purchase is still on track. Ask whether any known problems or issues could affect your completion date. The earlier you discover a potential problem, the more options you will have.   

You have up to 30 days before your mortgage offer expires… 

Call your mortgage broker as soon as possible to discuss your options. They can tell you whether you need an extension and, if so, when the lender will accept a request. 

Then speak to your solicitor and ask whether you can exchange and complete within the next month. At this stage, you should also tell your estate agent so they can communicate this across the chain, because not everyone will know your deadlines, and passing that message on can put pressure on other parties.  

You have just two weeks before your mortgage offer expires… 

This is where your situation becomes urgent. Double-check the expiry date on your mortgage offer and speak to your mortgage broker immediately, before speaking to your solicitor and estate agent, asking what is achievable. Even if the delay is not your fault, everyone needs to know what is at stake because an expired mortgage offer can cause serious problems.  Sometimes a tight deadline can be the catalyst that gets a stalled transaction moving, but only if the right people know. 

Can a mortgage offer be extended? 

The good news is that, in many cases, you can extend your mortgage offer. Lenders are realistic; they know that delays can happen, but every lender is different. Some may offer only a short extension, while others may require an entirely new application. That’s why you should ask as soon as possible, so you have more options throughout the process.  

When should you apply for a mortgage offer extension? 

If you think that something could delay your house sale or purchase, then you need to speak to your mortgage broker as soon as possible.  

Keeping your broker updated at every stage gives them time to speak to the existing lender and arrange an extension (if needed), or to reapply. Even if your conveyancing solicitor is confident that you will be able to complete before your expiry date, unexpected delays can happen at any point. Therefore, even if you think you’ve got 2-3 weeks leeway, you should make sure that your broker and your solicitor know your deadlines so they can act accordingly.  

Can you complete after a mortgage offer expires? 

This is where you may be starting to panic. The good news is that an expiring mortgage offer doesn’t automatically mean your purchase will collapse. 

However, it will probably cause a delay (which could impact the rest of your chain). Your broker will need to establish if they can extend the existing offer or reapply. You might need another affordability assessment, and there’s a strong chance that any new offer could be at a different interest rate, which could potentially cost you more with higher monthly repayments than you had budgeted for.  

Therefore, as responsible mortgage brokers, we always advise you to talk to us as soon as possible if you think your sale is being held up.   

Being organised can reduce the risk of your mortgage offer expiring 

If you only have between three and six months for your mortgage offer to be valid, it’s important to stay organised to reduce the risk of it expiring.  

The best thing you can do to protect yourself is to stay organised and have regular communication with your broker, your solicitor and your estate agent. Responding quickly to emails and paperwork requests can speed up the process and prevent unnecessary delays. Most importantly, make sure everyone in the chain knows when your deadline is approaching, and raise concerns early rather than hoping delays will resolve themselves. 

The real risk isn’t that mortgage offers expire. It’s that many buyers don’t realise a problem is developing until they’re only days or weeks away from the deadline. 

Knowing your expiry date, understanding who’s responsible for what, and involving your broker early can help prevent a stressful delay from becoming a serious threat to your move.