What is a short lease property and why is it risky?
Short lease property is one of the most misunderstood risks in the auction room. A flat with 75 years remaining on its lease might look identical to one with 120 years — same location, same condition, similar guide price. But the legal and financial reality of those two properties could not be more different. One is a straightforward purchase. The other could leave you with a property you cannot mortgage, cannot sell at a fair price, and face an expensive legal process just to put right.
Auction catalogues regularly feature short lease flats, often because they are difficult to sell through the open market. They are not always bad purchases — but they are purchases that demand proper legal and financial analysis before you bid. This guide explains exactly what a short lease means, why the 80-year threshold is so important, and what you need to know about lease extension cost before you commit.
What is a short lease property?
A short lease property is generally understood to be a leasehold property where the unexpired term of the lease has fallen below 80 years. This 80-year mark is not an arbitrary figure — it is a legally significant threshold that triggers a specific additional cost when you come to extend the lease, and it is the point at which many mortgage lenders begin to impose restrictions or refuse to lend altogether.
To understand why this matters, it helps to remember what leasehold ownership actually means. When you buy a leasehold property, you are not buying the bricks and mortar. You are buying the right to occupy the property for the number of years remaining on the lease. Once those years run out, ownership reverts to the freeholder. The shorter the lease, the less time you have — and the less the property is worth as a result.
Leasehold property is sometimes described as a wasting asset for this reason. Unlike a freehold, which holds its value indefinitely, a lease loses value as each year passes. The rate at which that value erosion accelerates increases significantly as the lease falls below 80 years, and again as it approaches 70, 60, and lower.
Why does 80 years matter so much?
The 80-year threshold matters because of a legal concept called marriage value. This applies when a leaseholder seeks to extend a lease that has already fallen below 80 years, and it significantly increases the cost of doing so.
What is marriage value?
Marriage value is the increase in the total value of a property that results from granting a lease extension. The logic is that a property with a long lease is worth considerably more than the same property with a short lease. When the two interests — the leasehold and the freehold — are brought together through an extension, they create a combined value greater than the sum of the parts. This uplift is the marriage value.
Under the Leasehold Reform, Housing and Urban Development Act 1993, where the remaining lease term is below 80 years at the valuation date, the leaseholder must pay the freeholder 50% of the marriage value as part of the lease extension premium. This is on top of the other elements of the premium calculation. The closer the lease is to expiry, the higher the marriage value — and the larger the freeholder’s share becomes.
In practical terms, this means that a short lease property with 72 years remaining could cost tens of thousands of pounds more to extend than a property with 82 years remaining. That difference does not show up in the auction guide price. It shows up later, when you instruct a solicitor and a valuer to begin the statutory process.
What about mortgage lenders?
Mortgage lenders apply their own minimum lease length requirements, which vary between lenders but typically sit between 70 and 85 years at the point of application. Many lenders also require that the lease has a specific number of years remaining at the end of the mortgage term — often 30 or more years beyond the final repayment date.
In practice, this means that a property with 75 years on the lease might be mortgageable with some lenders today but not with others — and may become unmortgageable in a few years’ time without an extension. If you are buying a short lease property at auction using finance, you must confirm your lender’s specific requirements before you bid. Discovering after the event that your lender will not proceed is a very expensive problem.
Why short lease properties appear at auction
Short lease flats appear at auction regularly, and there is a reason for that. They are difficult to sell on the open market. A buyer purchasing through a traditional estate agent process can walk away if they discover the lease is short, and they have time to reflect, get mortgage advice, and reconsider. Many buyers do exactly that, which means short lease properties often linger unsold until the seller turns to auction.
At auction, the binding commitment happens the moment the hammer falls. There is no time to reconsider, no cooling-off period, and no opportunity to renegotiate. The auction format converts a difficult-to-sell property into a completed transaction, often at a price that reflects the lease risk — but not always transparently so.
Auction legal packs for short lease properties are frequently incomplete. The lease length may be referenced vaguely or not at all. There may be no indication of whether a lease extension process has been started or considered. And without an LPE1 form or management pack, you may have limited information about the overall financial position of the building as well.
This is precisely the kind of situation where a thorough pre-auction legal pack review is essential. Our guide to what we check in an auction legal pack explains in detail what a specialist solicitor should be identifying before you consider bidding on a leasehold lot.
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Understanding lease extension cost before you bid
Lease extension cost is not a fixed figure. It depends on a combination of factors, and it can vary considerably from property to property. Understanding the components of the premium is important because it allows you to factor the true total cost into your maximum bid — not discover it afterwards.
The main components of a statutory lease extension premium are:
- Ground rent capitalisation. The value of the ground rent payments the freeholder will lose as a result of the extension reducing the ground rent to a peppercorn.
- Reversion value. The value of the freeholder’s right to recover the property at the end of the existing lease term, discounted to reflect the time remaining.
- Marriage value (where applicable). As explained above, this applies only where the lease has fallen below 80 years and can significantly increase the total premium.
On top of the premium itself, there are professional fees to consider. You will need to instruct a solicitor and a specialist leasehold valuer, and you will also be required to pay a reasonable contribution towards the freeholder’s professional costs. These additional costs can add several thousand pounds to the total expense.
As a rough guide, extending a lease with more than 80 years remaining on a mid-range flat might cost between £10,000 and £20,000 in total, including all professional fees. For a flat with 70 years or fewer remaining, the same process could cost £30,000 or significantly more, depending on the property value and the ground rent provisions. These are ballpark figures — a specialist valuer will provide an accurate estimate based on the specific property.
Can you extend the lease immediately after buying at auction?
Not through the statutory route. Under the 1993 Act, you must have owned the property for at least two years before you can serve a formal notice to extend. This means that if you buy a short lease property at auction today, you cannot use the statutory process to extend the lease for the first two years of your ownership.
During that period, you may be able to negotiate an informal extension directly with the freeholder. However, an informal extension offers no statutory protections, no right to a peppercorn ground rent, and no independent valuation right. Freeholders are under no obligation to agree, and if they do, they may charge a premium that reflects their commercial advantage in the situation rather than a fair market rate.
One strategy that experienced auction buyers use is to request that the seller serves a Section 42 notice — the formal statutory notice triggering the extension process — before the auction, and then assigns the benefit of that notice to the buyer on completion. This is not always possible, and it requires careful legal preparation. If this option is available, your solicitor will identify it when reviewing the legal pack before the auction.
Understanding the full timeline and your options is essential. Our guide to what to do before you bid at auction covers the pre-auction steps that every buyer should take, including how to approach leasehold lots with a clear head.
What to check before bidding on a short lease property
If you are considering bidding on a short lease property at auction, the following points must be established before you go anywhere near the auction room:
- Confirm the exact number of years remaining on the lease — not an approximation, the precise unexpired term.
- Establish whether the lease is above or below 80 years and factor marriage value into your cost calculations accordingly.
- Obtain a preliminary lease extension cost estimate from a specialist leasehold valuer before you bid.
- Confirm whether your mortgage lender will lend on the current lease length, or whether an extension would be required before drawdown.
- Check whether the seller has served or is able to serve a Section 42 notice, and whether this can be assigned to you on completion.
- Factor in the full two-year wait before you can use the statutory extension route yourself, and plan your ownership strategy accordingly.
How Auction Solicitor can help you assess a short lease lot
At Auction Solicitor, reviewing leasehold lots — including short lease properties — is something we do every day. When we review an auction legal pack, we confirm the exact lease length, identify the marriage value threshold, flag any missing information, and advise you clearly on what the financial exposure looks like before you bid.
We will tell you whether the short lease is a manageable risk given your plans for the property, whether the guide price adequately reflects the true cost of ownership including a future extension, and whether there are any structural issues with the lease itself that go beyond the length. For some lots, the advice will be to proceed with caution. For others, it will be not to bid at all — and we will be direct with you about which is which.
Our auction pack review service is available across England and Wales and can be turned around quickly to fit auction timescales. If you have found a short lease property in an upcoming catalogue, instruct us as soon as the legal pack is published — the earlier we review it, the more time you have to make a fully informed decision.
The Leasehold Advisory Service provides free, independent guidance on how to extend a lease and what the process involves, including information on statutory rights, valuation principles, and the costs leaseholders can expect to pay.
Get specialist advice on short lease auction lots
Short lease properties require careful legal and financial analysis before you bid. We confirm the lease length, calculate the true cost of extension, and advise you on whether the numbers stack up.
