Six Weeks Left on the Mortgage Offer: A Seller’s Calm, Week-by-Week Playbook

A mortgage offer has a shelf life. When a buyer’s funding is nearing expiry, the sale stops feeling like a straight line and starts feeling like a countdown. For UK sellers in 2026, that is not a reason to panic — but it is a reason to get organised. Lenders, solicitors, search providers, and managing agents all move at their own pace. Your job is to spot the deadline early, keep the file moving, and know what you will do if the offer runs out.

Why mortgage offers expire

Most residential mortgage offers are valid for a set period, often three to six months, though some are shorter. The expiry date is not a gentle suggestion. If completion happens after the offer ends, the lender can withdraw it or require a fresh application. An extension is sometimes possible, but it is not automatic. The lender may re-underwrite the case, re-check affordability, ask for a new valuation, or move the buyer onto a different product. In a market where leasehold queries, building safety information, and affordability checks can all add weeks, relying on a last-minute extension is a risk.

Warning signs to watch at six weeks

The earliest signs are usually administrative. The buyer’s solicitor cannot confirm searches have been ordered. Enquiries sit unanswered. The mortgage broker is vague about the offer expiry date. The lender asks for more documents, or orders a second valuation. The leasehold management pack is missing. The buyer mentions a job change, a gifted deposit, or a new credit commitment. Your estate agent keeps hearing ‘waiting on the lender’ without a date attached. None of these means the sale is doomed, but together they are a signal to start chasing.

What you can and cannot control

You cannot control the lender’s underwriting, the buyer’s finances, the local authority’s search turnaround, or the freeholder’s response time. You can control how quickly you answer enquiries, how easily you provide documents, and how clearly you communicate. You can make sure your solicitor has everything they need to exchange. You can agree a completion date that fits the mortgage offer rather than one that ignores it. And you can keep a Plan B in mind without destabilising the current sale.

Week by week: the last six weeks

Six weeks to go: audit the file

Ask your estate agent and solicitor for a written status update: searches, enquiries, draft contract, mortgage, and any leasehold pack. Get the buyer’s mortgage offer expiry date confirmed by their broker, not guessed at. Make a one-page timeline. Check your own paperwork: ID, proof of address, title information, EPC, guarantees, planning permissions, building regulations certificates, boiler service records, and management pack. Fix obvious gaps now.

Five weeks to go: clear the enquiries

Answer solicitor enquiries fully and promptly. If the property is leasehold, chase the managing agent or freeholder. If there is cladding or building safety information, provide what you have and ask what is still missing. Allow access for any survey or valuation. Ask the buyer’s solicitor for a target exchange date. If searches are outstanding, ask the local authority for a realistic timescale. Silence is not progress.

Four weeks to go: test the mortgage

Ask the buyer’s broker whether an extension has been requested and what the lender needs. If the offer expires before the expected completion date, request the extension now — not in the final week. Ask whether the lender needs a new valuation or updated documents. If the buyer’s affordability is tight, avoid complicating the file with last-minute changes. Keep your solicitor informed so they can plan exchange around the funding deadline.

Three weeks to go: agree the mechanics

Agree target exchange and completion dates with both solicitors. Check they fit the mortgage offer. If not, the buyer needs to request an extension in writing. Confirm the deposit source and any gift letters. For leasehold, confirm notice periods and apportionments. For freehold, confirm the transfer. Book removals only after exchange, or use a flexible cancellation policy. A completion date that ignores the mortgage expiry is not a plan; it is a hope.

Two weeks to go: push for exchange

Exchange should be the goal. If enquiries remain, prioritise the ones that affect lending or title. If the buyer’s solicitor is slow, ask your solicitor to escalate politely and keep a written record. If the lender asks for more information, respond the same day where possible. If completion is likely to slip past the offer expiry, get the extension confirmation in writing before you agree to anything.

One week to go: decide, don’t drift

If exchange has not happened, ask for a realistic date. If the mortgage offer expires in days and no extension is confirmed, prepare for a delay. Do not hand over keys or agree completion before funds are confirmed. If the sale collapses, relist quickly: update photos, EPC, protocol forms, and ask your agent for feedback. A ready-to-go pack helps a new buyer move faster.

Expiry week: contingency, not panic

If the offer expires, the sale may still complete with an extension — but get it in writing. If the lender declines, the buyer may need a new application at current rates, which can change affordability. You can agree a short pause, but set a review date. Meanwhile, keep the property marketable. If speed matters more than top price, consider whether a cash buyer is a sensible alternative. A cash sale is not automatically better, but it does remove mortgage expiry from the equation.

Keep the sale human

A mortgage deadline makes everyone tense. Clear, dated communication beats blame. Ask for facts: what does the lender need, when will searches return, what date can solicitors exchange? Then decide whether to hold, renegotiate, or relist. In 2026, the sellers who keep a sale alive are usually the ones who spot the countdown early and give buyers a clear route to completion.