Selling a Flat With a Short Lease: Extend, Sell As-Is or Go Cash?

By Lisa Hayes · 26 October 2026

You can sell a flat with a short lease, but the price you get depends almost entirely on one number: how many years are left, and which side of 80 (and, for mortgage buyers, roughly 85) you sit on. Your realistic routes are to extend the lease first, sell as it is to a buyer who can pay cash, or serve a lease extension notice and pass the benefit on to the buyer. Most owners pick the wrong one because nobody shows them the numbers side by side, so that is what this guide does.

What counts as a short lease?

There is no legal definition of a "short" lease in the Land Registry sense, but the working rule among solicitors, surveyors and lenders is simple. Fewer than 80 years unexpired is short. Fewer than 70 is very short. Between 80 and about 90 is a grey zone where the flat is technically fine but starts to put buyers off.

Why 80? Because that is the line in the Leasehold Reform, Housing and Urban Development Act 1993 below which marriage value is added to the price of a statutory extension. GOV.UK says it plainly: you can ask your landlord to extend at any time, but once 80 years or less remain, the cost increases significantly.

Leases are normally granted for 99, 125 or 999 years. A 99-year lease that was new in 1990 now has about 63 years left. Nobody warns you about this when you buy, and the years tick down whether you are paying attention or not.

Why is a short lease such a problem when you sell?

Three things collide.

First, the flat is a wasting asset. When the lease runs out, the property goes back to the freeholder. A buyer is not just buying the flat, they are buying the right to live in it for a fixed number of years, and every year they own it that number falls.

Second, mortgage lenders. This is the one that actually kills sales. Lenders set minimum unexpired terms, and they differ. In the UK Finance Lenders' Handbook (question 5.14.1, "What minimum unexpired lease term does the lender accept?"), the answers vary lender by lender. One lender, Zephyr Homeloans, asks for at least 70 years remaining at the end of the mortgage term. Another, Investec, asks for at least 60 years after expiry of the mortgage. Law firms advising on short leases report that lenders are wary of anything close to or below 85 years, and that leases of around 75 to 85 years are often unacceptable to them.

Read that last point twice, because it catches people out. If a buyer wants a 25-year mortgage and the lender wants 70 years left at the end, the lease needs 95 years at the start. Your 88-year lease, which sounds perfectly respectable, may be unmortgageable for that buyer.

Third, buyers who can't get a mortgage have to be cash buyers, and cash buyers want a discount. That is your shrinking buyer pool in one sentence.

• 80 yrsthe marriage value line
• 90 yrsadded to a flat lease by statutory extension (GOV.UK)
• 31 Jan 2025two-year ownership rule abolished
• 2 monthslandlord's window to respond to a section 42 notice

How does a lease extension work, and what does it cost?

If you qualify, the statutory route lets you add 90 years to a flat lease, with ground rent reduced to a peppercorn (effectively nothing), whether or not your landlord is keen. You start by serving a section 42 notice, which sets out the premium you are offering. The landlord has two months to reply with a counter-notice. If you cannot agree the figure, either side can take it to the First-tier Tribunal (Property Chamber).

The premium itself has three parts, and here is where people get lost. There is the drop in the freeholder's interest (the ground rent they lose and the reversion they are pushed back), there is "marriage value", and there is compensation for any other loss. Marriage value only applies when the lease has 80 years or fewer left. It is the extra value created by lengthening the lease, and the law splits it 50/50 between you and the landlord.

On top of the premium you pay the landlord's reasonable legal and valuation costs, as well as your own solicitor and valuer. People forget this. It is a real number and it is not small.

A worked illustration (made-up numbers, real mechanism)

To show how marriage value bites, take a deliberately simple example. These are not market figures, only arithmetic so you can see the logic.

• Your flat with a long lease would be worth £250,000.
• With its current short lease, it is worth £215,000 to a buyer.
• Extending lifts it to £250,000, an uplift of £35,000.
• If the lease is under 80 years, half of that uplift, £17,500, goes to the landlord as marriage value, before the other parts of the premium and before anyone's legal fees.

The same flat just above 80 years pays no marriage value at all. That cliff edge is why timing matters so much, and why I'd always rather you serve notice at 80.5 years than at 79.5.

Has the Leasehold and Freehold Reform Act 2024 changed any of this?

Partly, and this is where a lot of articles online are out of date or over-excited.

The Act received Royal Assent on 24 May 2024. One piece is in force: the requirement to have owned the flat for two years before claiming an extension was removed on 31 January 2025. If you bought last month, you can serve notice now.

The headline items are not. Abolishing marriage value, capping ground rent in the premium calculation, setting standard valuation rates and moving to 990-year extensions all depend on regulations that, as far as I can see from the sources I checked, have not been commenced. The valuation rates have not even been consulted on, according to commentary from specialist solicitors, and realistic estimates for the new regime run to 2027 or 2028 at the earliest. A draft Commonhold and Leasehold Reform Bill was published in January 2026, and the freeholders' legal challenge to the Act is working through the courts, with permission to appeal granted in April 2026.

My view: if you are selling this year, treat the old rules as the rules. You can't price a flat on a law that is not in force. A buyer who says "marriage value is going anyway, so I'll deduct nothing for it" is gambling with your money. Equally, a buyer who offers you a deep discount citing a cost that may shrink is looking for an excuse.

What are my options for selling a flat with a short lease?

Should I extend the lease before I sell?

Sometimes. Not always, and this is where I disagree with the standard advice that "extending is always best". It isn't.

My rule of thumb: extend first when you have time, you are comfortably able to fund it, and the flat sits in a market where mortgage buyers dominate. Do not extend first when you are in a hurry, short of cash, or the flat has other problems (cladding, high service charges, a landlord who is difficult). In those cases the extension is money chasing a sale you may not need to wait for.

Whatever you do, get the premium estimated by a RICS valuer who does lease extensions every week. The Leasehold Advisory Service (LEASE) publishes a calculator that gives a guide, and that is a fine starting point, but it is a guide, not a quote.

Can I pass the right to extend to the buyer?

Yes, in principle. A seller can serve a section 42 notice and then assign the benefit of that notice to the buyer on sale. The buyer steps into your shoes, the valuation date stays fixed at the date your notice was served, and the price reflects the extension being underway.

Why would you do it? Because it locks in the valuation date. If you serve at 80.4 years and the buyer takes ten months to complete the whole process, their own notice would be valued at a later date, when the lease might be below 80. Your notice freezes it.

Now the honest bit. This is a fiddly manoeuvre. It needs a leasehold solicitor who has done it before, the paperwork must be exactly right, and a number of commentators describe it as an older workaround that goes wrong when handled casually. With the two-year rule gone, most buyers who are the registered owner can simply serve their own notice immediately. The assignment is worth a conversation if you are teetering on the 80-year line, and not much more than that.

What does a cash buyer pay for a short lease flat?

The figure usually quoted across the industry is 75–85% of open market value, and short lease flats tend to sit towards the lower end. I cover how those percentages are actually worked out in what percentage of market value cash buyers pay.

The logic is not mysterious. A cash buyer will usually have to fund the lease extension themselves, wait out the process, and then resell. They are pricing in the premium, the legal costs, the time, and a margin for risk. So the question for you is not "are they ripping me off?" but "does their number beat what I would net by extending and selling myself, after costs and months of waiting?"

Here is how I would test it. Get a lease extension estimate. Take your best open market value on a long lease from at least two agents. Subtract the premium, both sets of fees, and a realistic holding cost for six to nine months (service charge, ground rent, insurance, utilities, mortgage interest if you have one). Compare what is left to the cash offer. Sometimes the cash offer is miles behind, sometimes it is surprisingly close. Do the sum before you decide.

If you want to see the market, the guide to cash house buyers explains how they work, and best house buying companies lays out who is worth speaking to. A flat is not a house, so ask any buyer directly whether they buy leasehold flats and what minimum lease length they will consider. Some will not touch under 60 years.

The questions to put to any cash buyer

• Do you buy flats with leases under 80 years, and what is your lower limit?
• Will your offer be reduced after survey or after you see the lease?
• Do you pay my legal fees, and are there any charges for withdrawing?
• Can you show proof of funds, not just a promise?
• Who is your solicitor, and have they handled lease extensions?

If you get vague answers, move on. A buyer who cannot tell you their lease length limit in the first call is not a serious buyer.

Will a short lease affect the sale price on the open market?

Yes, and the effect gets steeper as the years fall. I will not quote you a percentage as though it were law, because I have not found a reliable, published, nationwide figure I would stand behind, and the effect varies by area, by flat and by the strength of local demand. What I can say is that a London flat in a high-demand area will often hold its value better with a shorter lease than a flat in a weaker market, simply because there are more cash buyers and investors around.

Your best evidence is local. Look at what flats with similar leases have sold for on Land Registry data, and ask agents for recent comparables with lease lengths stated. If they cannot give you any, that tells you something about their experience. For general valuation help, see how much your home is worth and the free house valuation guide, then ask any agent specifically how they would value the flat on a long lease versus the current lease.

What if the lease is very short, under 60 or 70 years?

This is the territory where honest advice changes. At this length, mortgage buyers have gone, extension premiums are high because marriage value is large, and the pool shrinks to cash buyers, investors and auction bidders.

Three things to do straight away.

1. Find out your exact unexpired term. Do not rely on the original term minus years since purchase. Check the lease start date, which is often earlier than the date you bought, and confirm with your solicitor.
2. Get a proper extension valuation. You need a number to measure every offer against.
3. Talk to your landlord. Informal extensions are sometimes cheaper than statutory ones, particularly where the landlord is a housing association or a managing agent for a large estate. It costs nothing to ask.

If the flat is also awkward in other ways, take a look at the guide to selling an unsellable house, which applies to flats as much as houses, and the piece on how to sell a property that will not sell.

Are there other lease problems that stack up with a short lease?

Often, yes. A short lease on its own is manageable. A short lease plus any of the following is where sales fall over:

• Escalating ground rent. Doubling ground rents were a scandal, and lenders still look at them closely. If yours doubles every 10 or 25 years, say so early and get advice.
• Heavy or unclear service charges. A buyer's solicitor will ask for three years of accounts and will spot a looming major works bill.
• Cladding or fire safety issues. These affect mortgageability on their own, before the lease is even considered.
• Absent or hostile freeholder. If you cannot find your landlord, the process gets longer and sometimes needs a court application.
• Missing consents or management pack delays. Slow managing agents add weeks.

My honest advice: write down every problem the flat has, not just the lease, before you choose a route. One issue is a conversation. Three issues is a different strategy, and usually points to a cash sale or auction rather than a long, hopeful open-market attempt.

Step by step: what to do this month

1. Get your lease and your title. Download the official copy from HM Land Registry if you do not have the lease to hand.
2. Work out the unexpired term to the day.
3. Check which side of 80 you are on. If you are within a year or two of the line, this becomes urgent.
4. Ask a leasehold specialist solicitor for a quick view. Many will give a short initial opinion for a modest fixed fee.
5. Get a lease extension valuation from a RICS surveyor.
6. Get two or three agent valuations on the flat as it is and as if extended. See our guides for how to compare agents and fees; the estate agent fees guide explains what is normal.
7. Collect two or three cash offers so you know what the fast route is worth.
8. Do the net-proceeds sum on each route and choose on numbers, not nerves.

What does the conveyancing look like on a short lease flat?

Slower than on a house, nearly always. Leasehold flats need a management pack from the freeholder or agent, ground rent and service charge receipts, buildings insurance details, and often a licence or consent for certain works. A short lease adds another layer, because the buyer's solicitor will want to understand exactly what is happening with the extension. I explain the general process in the conveyancing explained guide, and the differences that matter to a quick sale in freehold versus leasehold.

Start the paperwork before you have a buyer. Ask your managing agent for the sale pack now, and ask what they charge for it. Some charge a few hundred pounds and take weeks. Knowing that early removes one of the most common causes of delay. If speed is the aim in general, the guide to selling a flat fast is a good companion to this one.

Is Scotland different?

Yes. The lease extension rights described here come from legislation covering England and Wales. In Scotland, flats are normally owned outright rather than held on long leases, so the short lease problem barely arises. Northern Ireland has its own rules. If your flat is outside England and Wales, speak to a local solicitor before relying on anything above.

Common mistakes I would help you avoid

• Waiting for the law to change. The marriage value reform may come, but not on a date you can plan around. If your lease is dropping through 80 now, that is a cost today.
• Assuming a high-street agent will fix it. Many agents are great at marketing flats and poor at explaining leases. Ask them to name a recent short lease sale they have handled.
• Ignoring the lender's term-at-end-of-mortgage test. A buyer's mortgage in principle does not guarantee a mortgage offer once the valuer and lender see the lease.
• Using the first valuer or solicitor you find. Lease extension work is specialist. A general high-street conveyancer may quote low and then get stuck.
• Taking a cash offer without comparing it with your net extension proceeds. You do not need to say no. You just need to know what you are saying yes to.
• Signing up with a buyer who wants an exclusivity or lock-in fee before surveying the property. Be wary of any upfront payment.

Frequently asked questions

Can I sell a flat with 60 years left on the lease?

Yes, but not to most mortgage buyers. Your market will be cash buyers, investors and auction bidders, and you should expect a discount that reflects the cost and time of extending. Get a valuation of the extension so you can judge any offer.

Is it better to extend the lease or sell as it is?

It depends on your time, cash and how far under 80 years you are. Extending usually produces the highest sale price but costs money up front and takes months. Selling as it is, particularly to a cash buyer, is quicker and cheaper to start but means a lower price.

Do I have to wait two years before extending the lease?

No. The two-year ownership requirement was abolished on 31 January 2025, so you can serve a section 42 notice as soon as you are the registered owner.

Will marriage value be abolished?

The Leasehold and Freehold Reform Act 2024 provides for it, but the relevant provisions were not in force at the time of writing and no commencement date had been set. Until they are, marriage value still applies where the lease has 80 years or fewer left.

What lease length do mortgage lenders require?

It varies by lender. Some require a minimum of around 70 years remaining at the end of the mortgage term, others look for 60 years after expiry, and solicitors report that leases between roughly 75 and 85 years are often unacceptable. Ask the buyer's broker which lender they are using.

How long does a statutory lease extension take?

If the landlord engages and the premium is agreed, it can complete in a couple of months. The landlord has two months to respond to the notice, and if the price is disputed the process can run on for much longer, including a referral to the First-tier Tribunal.

Who pays the landlord's costs on a lease extension?

You do. Alongside the premium you pay the landlord's reasonable legal and valuation costs, as well as your own.

Can a cash buyer buy a flat with a very short lease?

Some can, many have a lower limit. Ask each buyer for their minimum unexpired term before you send documents or spend money.

Where to go from here

If your lease is short, you have a clock running and a few clear choices, and none of them is hopeless. Work out your exact term, speak to a leasehold specialist, get the extension number, and compare it to what cash buyers will pay. If the numbers say a fast sale suits you, you can compare offers through Ready Steady Sell, so you can see what is on the table without committing to anything. I'm not a solicitor, and none of this is legal advice, so please have a leasehold specialist check the detail for your own lease before you act.