A buyer finds a handsome flat in a prime London mansion block. The price is noticeably lower than the flat upstairs, which sold last year with a long lease. The rooms are the same size, the staircase is the same, and the view is the same. The only difference is the lease, and it has 68 years left. The discount looks like a bargain. It may be one. It may also be the most expensive saving the buyer ever makes.
The short answer is yes. A short lease does reduce a luxury flat’s value, and the reduction grows as the lease shortens. Below 80 years the discount is material. Below 70 years it steepens, because most mainstream lenders step back and the market narrows to cash buyers. Below 60 years the discount can exceed a quarter of the flat’s long-lease value. The reason is not that the flat is worse. It is that the buyer is buying a wasting asset with a costly repair bill attached, and the repair bill is the price of extending the lease.
This guide explains how much a short lease knocks off a luxury flat’s value, why the discount takes the shape it does, where the mortgageability cliff sits, whether a discounted short-lease flat is a bargain or a trap, and what the law says as of November 2026. It is general information for buyers and sellers, not legal or valuation advice. Every lease needs a specialist RICS valuer and a conveyancer who handles leasehold work, because the figures depend on the individual lease, the building, and the valuation date.
In brief: A short lease is generally one with 80 years or fewer left to run. Published valuer guides put the discount against a flat with a 99-year-plus lease at under 2 per cent above 90 years, 5 to 10 per cent at 81 to 89 years, 10 to 20 per cent at 70 to 80 years, 15 to 25 per cent at 60 to 69 years, and 25 per cent or more below 60 years. The discount is a rough band, not a fixed percentage, and it reflects three things at once: the cost of extending the lease, the shrinking pool of buyers who can get a mortgage, and the risk that the lease keeps falling while the owner waits. On a £2 million prime flat, the middle of those bands means roughly £200,000 to £400,000 at 70 to 80 years. The Leasehold and Freehold Reform Act 2024 legislates to abolish marriage value, but that provision is not yet in force as of November 2026, so the existing rules still apply.
What Counts as a Short Lease?
There is no single legal definition of a short lease, but surveyors, valuers and lenders work to a widely shared set of thresholds, and the most important of them is 80 years.
A lease with more than 80 years left is generally treated as a long lease. A lease with 80 years or fewer is a short lease. The 80-year line matters twice over. It is the point where most surveyors start describing a lease as short, and it is the point where marriage value switches on under Schedule 13 of the Leasehold Reform, Housing and Urban Development Act 1993. Above 80 years, marriage value is nil. At 80 years or fewer, the freeholder is entitled to 50 per cent of the marriage value as part of the extension premium, and that charge is what makes extending a short lease expensive. The mechanics are explained in full in the guide to marriage value explained, which this article links to rather than repeating.
Below 80 years, the market applies further informal thresholds. At around 75 years, a flat is still mortgageable with some lenders, though the choice narrows. Below 70 years, the lease is widely regarded as short, and the market is increasingly restricted to cash buyers. Below 60 years, the value falls faster, because mainstream lenders have mostly gone and the extension premium has grown large. These are not legal cut-offs. They are the points at which lenders, valuers and buyers change their behaviour, and behaviour is what sets the price.
The reason lenders care is the mortgage term. A typical mortgage runs for 25 years. A lender wants the lease to outlast the mortgage by a comfortable margin, so that the security still has value if the loan has to be enforced near the end of its term. A flat with 68 years left at the start of a 25-year mortgage has 43 years left when the mortgage ends, which sounds comfortable. The lender’s concern is different. It is that the flat’s value falls as the lease shortens, and that a borrower in difficulty near the end of the term may be trying to sell or refinance a flat that has become hard to mortgage. That is why lenders apply minimum remaining terms at application, commonly 70 to 80 years, and why their requirements differ from one lender to another. A buyer who needs a mortgage should check the lender’s minimum before making an offer, not after.
For a luxury flat, the same thresholds apply, but the sums are larger. A 10 per cent discount on a £400,000 flat is £40,000. On a £2 million prime flat it is £200,000. The percentage may be similar. The money is not, and neither is the extension premium that sits behind the discount.
How Much Value Does a Short Lease Take Off?
The discount is a band, not a fixed percentage, and it widens as the lease shortens. The bands below come from published valuer guides for the general market, measured against a flat with a lease of 99 years or more. They are rough guides that depend on the individual flat, and they should never be treated as a valuation. They are useful because they show the shape of the problem, and because no published guide works the numbers at prime values.
| Years remaining | Discount against a 99-year-plus lease | What drives it |
|---|---|---|
| 90 years or more | Under 2 per cent | Almost no discount; the lease is effectively long |
| 81 to 89 years | 5 to 10 per cent | Marriage value not yet payable, but the 80-year line is close and buyers price in the extension |
| 70 to 80 years | 10 to 20 per cent | Marriage value now applies, and the buyer pool starts to narrow |
| 60 to 69 years | 15 to 25 per cent | Mainstream lenders mostly gone; the market is largely cash buyers |
| Below 60 years | 25 per cent or more | Cash buyers only in practice, and the extension premium is large |
The relativity figures valuers use tell the same story from the other direction. Relativity is the value of a flat with a given lease length expressed as a percentage of the value of the same flat with a very long lease. The HomeOwners Alliance, citing valuers’ relativity formulae, notes that a flat with around 70 years left is worth roughly 88 per cent of its long-lease value on the formula, while warning in the same breath that in practice this cannot be relied upon. Informed buyers do not simply apply a formula. They deduct the anticipated extension cost plus fees, and then knock off extra for the hassle and the risk. That extra deduction is why the realised discount is often larger than the relativity figure alone would suggest.
The bands also explain why two flats in the same building can be priced very differently. A flat with 82 years left and a flat with 78 years left may look identical on a listing. The 82-year flat can be extended without marriage value. The 78-year flat cannot, and its buyer faces a premium inflated by the freeholder’s half of the marriage value, plus legal and valuation fees, plus stamp duty where the premium exceeds £125,000, which it almost always does at prime values. The market prices that difference in, and the price gap between the two flats is the discount this article is about.
Why the Value Falls: Three Forces at Once
The discount is not a single charge. It is three forces acting together, and understanding all three is what separates a buyer who has found a bargain from a buyer who has bought a problem.
The first force is the extension cost. A buyer who purchases a short-lease flat will, sooner or later, need to extend the lease, and the premium is the largest single element of that cost. The premium has three parts: the capitalised ground rent, the freeholder’s reversion, and, where the term is 80 years or fewer, 50 per cent of the marriage value. The full breakdown, with worked premiums at £1 million, £2 million and £3 million, is set out in the guide to lease extension cost on a prime London flat. What matters here is that the premium grows as the lease shortens, and it grows faster than the lease falls. A buyer who waits five years pays a premium on a shorter lease for a flat that is worth less than it was, and the cost of waiting is paid twice over.
The second force is the buyer pool. As the lease shortens, the number of people who can buy the flat shrinks. Mortgage buyers leave first, because lenders impose minimum remaining terms. Cash buyers remain, but they are fewer, and they know it. Investors and developers who specialise in short leases remain too, and they buy at a price that leaves room for the extension premium, the fees, the stamp duty, and their own margin. A smaller pool of buyers means less competition for the flat, and less competition means a lower price. This is the force that steepens the discount below 70 years, when the market narrows sharply to cash buyers.
The third force is risk and hassle. A short lease is not only expensive to fix. It is uncertain to fix. The freeholder may negotiate hard, or not negotiate at all. The two sides’ valuers may disagree about relativity, which is the most contested input in the whole calculation, and the dispute may end up before the First-tier Tribunal. The process takes months. The buyer must pay their own legal and valuation fees, and the freeholder’s reasonable costs as well. A buyer who has never extended a lease before will often pay more for certainty, which means paying less for a flat that carries this uncertainty. The discount includes a premium for that risk, and the premium grows as the lease shortens and the extension becomes more contentious.
Other features of the lease can widen the discount further. High or doubling ground rent adds to it, because the ground rent is capitalised into the premium and because buyers dislike it. A building-safety issue adds to it, because it affects mortgageability independently of the lease. A clause that prevents subletting adds to it, because it removes the option of letting the flat while the owner waits. None of these is the lease length itself, but all of them are priced into the same transaction, and a buyer should separate them out before deciding what the lease alone is costing.
The Mortgageability Cliff Below 70 Years
The steepest part of the discount curve sits below 70 years, and it is driven by lending rather than by valuation theory.
Most high-street lenders will lend on a flat with 70 to 80 years remaining, though they may impose conditions or require the lease to be extended as part of the purchase. Below 70 years, the choice narrows sharply. Some lenders will still lend, but their minimum terms, their maximum loan-to-value ratios and their requirements for an extension vary, and a buyer cannot assume that the lender who approved their last purchase will approve this one. Below 60 years, mainstream lending has mostly disappeared, and the market is, in practice, a cash market.
This matters for luxury flats in a specific way. A buyer of a £2 million flat may be a cash buyer, and may not need a mortgage at all. The mortgageability cliff still affects them, because it affects the next buyer. A flat that can only be sold to cash buyers has a smaller resale market, and a smaller resale market means a lower price, even for a buyer who never borrows. The discount is not only about the buyer’s own financing. It is about the financing of everyone who might buy the flat after them.
There is a second, quieter effect. A buyer who does need a mortgage on a short-lease flat may find that the lender’s valuer applies a cautious figure, and that the loan is approved at a lower loan-to-value than expected. The buyer then needs a larger deposit, which changes the economics of the purchase. A flat that looks 15 per cent cheaper than its long-lease neighbour may require a deposit that is larger in cash terms than the neighbour’s, because the lender is lending a smaller proportion of a smaller value. Buyers should ask their broker, before offering, what loan-to-value the lender will actually support on the specific lease length, and what conditions will be attached.
The practical rule is simple. Above 80 years, mortgageability is rarely the problem. Between 70 and 80 years, it is a question to ask early. Below 70 years, it is the central question, and a buyer who has not answered it before offering is buying blind.
A Worked Illustration at Prime Values
Published examples of short-lease discounts are almost always worked at £250,000 to £500,000, which is where most of the market sits. At prime values the percentages may be similar, but the money is very different, and the money is what a buyer actually pays. The illustration below applies the published discount bands to a £2 million prime flat, with the long-lease value held at £2 million so the effect of the lease alone is visible. It is an illustration, not a valuation. A real figure depends on the individual lease, the ground rent, the building, the location, and the valuation date, and only a valuer instructed on the actual flat can give a figure to rely on.
| Years remaining | Discount band | Indicative value of a £2m long-lease flat | Indicative discount in pounds |
|---|---|---|---|
| 85 years | Under 2 per cent | About £1.96 million to £2 million | Under £40,000 |
| 75 years | 10 to 20 per cent | About £1.6 million to £1.8 million | About £200,000 to £400,000 |
| 65 years | 15 to 25 per cent | About £1.5 million to £1.7 million | About £300,000 to £500,000 |
| 55 years | 25 per cent or more | Under £1.5 million | More than £500,000 |
Three things stand out. First, the discount at 85 years is modest, which is why a lease just above 80 years is rarely a problem in itself. The danger is drift. A lease at 85 years becomes a lease at 79 years in six years, and the discount moves from under 2 per cent to the 10 to 20 per cent band without the flat changing at all.
Second, the absolute sums at prime values are large even where the percentages look manageable. A 15 per cent discount on a £2 million flat is £300,000. That is more than the entire price of many flats outside London, and it is the reason the short-lease question matters more in the prime market than anywhere else. It is also the reason the extension premium, which is the largest part of what the discount represents, can be six figures on a prime flat while it is a few thousand pounds on an ordinary one.
Third, the bands are wide, and the width is the point. A flat at 75 years might be discounted by 10 per cent or by 20 per cent, and the difference is £200,000. What decides where in the band a flat sits is everything else about the transaction: the ground rent, the freeholder, the building, the service charge, the state of the market, and how many cash buyers are competing for it. That is why no published band can substitute for a valuation, and why a buyer who relies on a band alone is guessing.
There is one more pattern worth noting, because it cuts against intuition. Published guides observe that on higher-value flats the extension premium in pounds is larger, but it is often a smaller share of the flat’s price. The reason is that the premium is driven by the value of the flat and the length of the lease, and the relationship is not linear. A buyer should not assume that a £2 million flat with a short lease carries twice the discount of a £1 million flat with the same lease. The discount scales with value, but the proportion can be smaller at the top of the market, which is one reason prime short-lease flats can look attractively priced to an experienced buyer who knows the extension cost in advance.
Bargain or Trap? How to Tell the Difference
A discounted short-lease flat can be a genuine bargain, and experienced buyers and developers buy them deliberately. It can also be a trap, and the difference is not the size of the discount. It is whether the buyer knows, before offering, what the extension will cost and whether the numbers still work after that cost is paid.
The arithmetic is straightforward, and a buyer should do it before offering rather than after exchange. Take the price being asked. Add the extension premium, using a valuer’s estimate for the actual lease rather than a published band. Add the legal fees, the valuation fees and the freeholder’s reasonable costs. Add stamp duty on the premium, where the premium exceeds £125,000, which it almost always does at prime values. Then add a margin for delay, dispute and the risk that the premium comes in higher than estimated. Compare the total with the value of the same flat with a long lease. If the total is materially lower, the discount may be a bargain. If the total is close to, or above, the long-lease value, the buyer is paying full price for a flat that still carries a short lease, and the discount was an illusion.
The trap has a second form, which is subtler. A buyer may buy a short-lease flat at a fair discount, extend the lease, and still lose money, because the lease kept falling while the extension was being negotiated. The premium is calculated on the valuation date, which is the date the section 42 notice is served, and the process takes months. A buyer who serves the notice late, or who spends months negotiating informally before serving it, pays a premium on a shorter lease than the one they bought. The two-year ownership rule, which used to require a leaseholder to own the flat for two years before serving a section 42 notice, was abolished on 31 January 2025, so a buyer can now start the statutory process immediately after purchase. That change removes one reason for delay, but it does not remove the cost of delay itself. Extend early, and never let a lease drift below 80 years without a plan.
There are three warning signs that a discounted short-lease flat is more likely to be a trap. The first is a freeholder who will not engage, or a freeholder who is a large estate landlord with a history of contesting valuations, because the negotiation will be longer and more expensive. The second is a lease with high or doubling ground rent, because the ground rent is capitalised into the premium and because it adds a separate problem that an extension may not fully solve. The third is a building with service charge or safety issues, because those affect the flat’s value independently of the lease, and a buyer who attributes the whole discount to the lease will underestimate the total cost of ownership. Service charges on luxury London flats are a cost in their own right, and they should be checked separately before any offer.
A buyer who has done the arithmetic, checked the freeholder, checked the ground rent, checked the service charge, and confirmed the mortgage position before offering is in a strong position. A buyer who has done none of those things and is relying on the size of the discount is not buying a bargain. They are buying a lease, and they do not yet know what it costs.
Buying a Short-Lease Flat: What to Do Before You Offer
The steps below are the practical minimum for a luxury buyer considering a short-lease flat. They are not a substitute for professional advice, and they should be done with a conveyancer who handles leasehold work, not a generalist.
First, get the lease. Read the unexpired term, the ground rent and how it changes, the service charge provisions, any restrictions on subletting or alterations, and the identity of the freeholder. A lease is a long document, and the parts that matter for value are not always the parts a buyer reads first. The conveyancer should flag anything unusual, and the buyer should ask specifically about ground rent escalation and about any clause that could affect resale.
Second, instruct a valuer. Not an estate agent’s estimate, and not a published band, but a specialist lease-extension valuer who can give a figure for the premium on the actual lease, with the relativity graph they are using stated explicitly. The valuer should also give a view on the flat’s value with its current lease, so the buyer can see whether the asking price reflects the discount the bands suggest. If the asking price is above the valuer’s figure for the short-lease value, the discount is not a discount.
Third, check the mortgage position. Ask the broker what loan-to-value the lender will support on the specific remaining term, whether the lender requires the lease to be extended as a condition of lending, and whether the lender’s valuer has flagged anything. Do this before offering. A mortgage offer that arrives with a condition the buyer cannot meet is worse than no offer at all, because it arrives after the buyer has committed time and money.
Fourth, decide the extension route before offering, not after. The statutory route, under the 1993 Act, adds 90 years to the lease and reduces the ground rent to a peppercorn, and the premium is determined by valuation, with the First-tier Tribunal as the fallback if the parties cannot agree. The informal route is a negotiated deal with the freeholder, which can be faster but may leave a meaningful ground rent in place and may not add the full 90 years. The choice affects the price, and a buyer who has not chosen a route cannot know what the flat will cost them in total. The full comparison of the two routes is set out in the guide to lease extension cost on a prime London flat.
Fifth, factor in the total cost of the purchase, not only the price. Stamp duty, legal fees, survey fees and the other costs of buying a luxury property in the UK are set out in the guide to the total cost of buying a luxury property in the UK, and the extension premium and its associated costs sit on top of them. A buyer who budgets for the price alone will be short by the extension cost, and the extension cost is the largest single item after the price itself.
Selling a Short-Lease Flat: What the Discount Means for You
The same discount that attracts a buyer is a cost to a seller, and a seller with a short lease has a choice to make before marketing the flat. The choice is whether to extend first and sell with a long lease, or to sell with the short lease and let the buyer take the discount.
Extending first usually produces the higher price, because the flat can then be sold to mortgage buyers as well as cash buyers, and because the buyer no longer has to price in the extension cost, the fees, the delay and the risk. The cost is the premium and the fees, and the time the extension takes, which is measured in months. A seller who extends first should also consider the stamp duty position, since stamp duty can apply where the premium exceeds £125,000.
Selling with the short lease is faster, and it avoids the upfront cost of the premium, but the price will reflect the discount, and the buyer pool will be narrower. The flat will attract investors and cash buyers, and the price they offer will leave room for the extension premium, the fees, the stamp duty and their own margin. A seller who chooses this route should expect a longer marketing period, because the pool of buyers is smaller, and should be prepared for the buyer to negotiate hard on the basis of the extension cost.
There is a middle route that is sometimes available. A seller who has served a section 42 notice can, in some circumstances, assign the benefit of that notice to the buyer, so the buyer can complete the extension on the terms already being negotiated. The availability of this route depends on the stage the notice has reached and on the freeholder’s position, and it needs a conveyancer’s advice. It is worth asking about, because it can bridge the gap between the two main options, giving the buyer certainty about the extension while letting the seller avoid completing it themselves.
Whichever route a seller chooses, the worst option is to market the flat without knowing the extension cost. A seller who does not know the premium cannot judge whether an offer is fair, and cannot explain to a buyer why the asking price is what it is. A valuer’s figure, obtained before marketing, is the cheapest insurance a seller of a short-lease flat can buy.
Reform: What the Law Says as of November 2026
Any guide to short leases written in November 2026 has to deal with reform, because the law has been changed on paper but not yet changed in practice, and the gap between the two is a source of real confusion.
The Leasehold and Freehold Reform Act 2024 was passed on 24 May 2024. It legislates to abolish marriage value and to replace the current 90-year extension with a 990-year extension at a peppercorn ground rent. If those provisions come into force, the cost of extending a short lease will fall substantially, and the discount on short-lease flats will narrow, because the largest single element of the extension premium will no longer exist.
As of November 2026, those provisions are not yet in force. The existing formula still applies, marriage value is still payable below 80 years, and a buyer who assumes the reform has already taken effect will underestimate the extension cost. The government has not, as of this writing, brought the marriage value abolition into force, and no date for commencement has been confirmed. Until it is, the current rules are the rules that matter.
One reform change has taken effect. The two-year ownership rule, which required a leaseholder to own a flat for two years before serving a section 42 notice, was abolished on 31 January 2025. A buyer can now start the statutory extension process immediately after purchase. That is a genuine improvement, and it removes one reason for delay, but it is a different change from the abolition of marriage value, and the two should not be confused. A buyer who has heard that leasehold reform has happened may be thinking of the two-year rule, or of the 2024 Act, or of both, and the distinction matters, because only one of them affects what an extension costs.
The practical advice follows from the position as it stands. Do not buy a short-lease flat on the assumption that marriage value will be abolished before you extend. Price the purchase on the current rules, and treat any future reform as a bonus rather than a plan. If the abolition does come into force, the buyer who has already extended will have paid a premium that a later buyer would not have to pay, and that is a real cost. It is also a cost that cannot be avoided by waiting, because waiting makes the lease shorter and the premium larger under the current rules. A buyer who waits for reform is betting that the reform arrives before the lease falls far enough to cost more than the reform would save, and that is a bet with no certain outcome.
For the latest position, check GOV.UK and the Leasehold Advisory Service before acting, and ask a conveyancer who handles leasehold work whether anything has changed since this guide was written. Reform is the one part of this subject where the answer in November 2026 may not be the answer in 2027.
Frequently Asked Questions
Does a short lease always reduce a flat’s value?
In practice, yes, once the remaining term falls to 80 years or fewer. Above 80 years the discount is small, under 2 per cent against a flat with a 99-year-plus lease in published guides. Below 80 years it grows, and below 70 years it steepens because most mainstream lenders step back. The discount is a market judgement, not a fixed rule, and it depends on the flat, the ground rent, the freeholder and the state of the market, but a short lease is a discount in the market’s eyes, and it is priced in.
How short is too short?
There is no single answer, because it depends on what the buyer needs. For a mortgage buyer, below 70 years is the point where the choice of lenders narrows sharply, and below 60 years mainstream lending has mostly gone. For a cash buyer, the question is different: it is whether the price, plus the extension premium, plus the fees and stamp duty, is still below the value of the flat with a long lease. A lease with 55 years left can be a good buy for a cash buyer who has done the arithmetic, and a lease with 75 years left can be a bad buy for a buyer who has not.
Can a short lease be extended after I buy?
Yes. Under the Leasehold Reform, Housing and Urban Development Act 1993, a qualifying leaseholder has the right to a statutory extension adding 90 years to the lease at a peppercorn ground rent, and the two-year ownership rule that used to delay that right was abolished on 31 January 2025, so the process can start immediately after purchase. The premium is determined by valuation, with the First-tier Tribunal as the fallback if the parties cannot agree. An informal, negotiated extension is also possible, but it may not add the full 90 years and may leave a ground rent in place.
Is a cheap short-lease flat a good investment?
It can be, and experienced buyers and developers buy them deliberately, but the return depends on the extension cost, not on the discount alone. A buyer should add the asking price, the extension premium, the legal and valuation fees, the freeholder’s costs and the stamp duty, then compare the total with the value of the flat with a long lease. If the total is materially lower, the purchase may be a good investment. If it is not, the discount was an illusion. The buyer should also consider that the flat will be harder to sell while the lease is short, and that the extension takes months.
Does the 2024 reform mean I should wait before extending?
Not on the evidence available in November 2026. The Leasehold and Freehold Reform Act 2024 legislates to abolish marriage value, but that provision is not yet in force, and no commencement date has been confirmed. Waiting makes the lease shorter, and a shorter lease costs more to extend under the current rules. A buyer who waits is betting that the reform arrives before the lease falls far enough to cost more than the reform would save. Price the purchase on the current rules, and treat any future reform as a bonus.
Does a short lease affect a luxury flat more than an ordinary flat?
The percentage discount is broadly similar, but the money is very different. A 15 per cent discount on a £400,000 flat is £60,000. On a £2 million prime flat it is £300,000, and the extension premium behind it can be six figures. The discount can also be a smaller share of the price on a higher-value flat, because the premium does not scale linearly with value. The practical difference is that the stakes are higher: the cost of getting the decision wrong is larger, and so is the reward for getting it right.
The Bottom Line
A short lease does reduce a luxury flat’s value, and the reduction is not a mystery. It is the market’s estimate of what it will cost to fix the lease, plus a discount for the smaller pool of buyers who can buy it, plus a premium for the risk and the hassle of fixing it. The estimate is expressed in bands: under 2 per cent above 90 years, 5 to 10 per cent at 81 to 89 years, 10 to 20 per cent at 70 to 80 years, 15 to 25 per cent at 60 to 69 years, and 25 per cent or more below 60 years. Those bands are rough guides, not valuations, and the width of each band is a reminder that the real figure depends on the individual flat.
For a buyer, the lesson is to do the arithmetic before offering. Price, plus premium, plus fees, plus stamp duty, compared with the long-lease value. If the total is materially lower, the discount may be a bargain. If it is not, the discount was an illusion, and the flat is not cheap at all. For a seller, the lesson is to know the extension cost before marketing, and to decide, with a valuer’s figure in hand, whether to extend first or to sell with the short lease and let the buyer take the discount.
The lease is the price tag on a prime flat, and it is written in years. A buyer who reads it before offering, and who understands what each year is worth, is the buyer who finds the bargain. A buyer who discovers the price tag after exchange is the buyer who pays it.