Short lease flats are where auction pricing goes wrong most often. A flat with 55 years left trades at a discount that looks like opportunity, and sometimes is. The discount is not sentiment, though. It is arithmetic: the cost of fixing the lease plus the risk of carrying it, and both can be estimated before you offer rather than discovered after completion.
This guide covers how the pricing works under the law in force on 1 August 2026, what the 2024 reform Act has and has not changed, and where buyers still get caught.
Lease length is the price
A leasehold flat is a wasting asset. Every year that passes, the term shortens and the freeholder’s reversion grows more valuable, which is why an 85-year flat and a 55-year flat in the same block are different products. The market prices this on a curve, and the curve is not linear: value decays slowly at long lease lengths, then accelerates hard as the term shortens.
The statutory fix exists. Under the current statutory route, a qualifying flat leaseholder can add 90 years to the lease at a peppercorn rent in exchange for a premium paid to the freeholder, the mechanism set out in section 56 of the 1993 Act. Pricing a short lease flat is therefore really pricing the flat with a long lease, minus the full cost of getting there.
The 80-year cliff is real
Government guidance puts it plainly: when a lease has 80 years or less remaining, the cost of extending increases significantly. The driver under the law in force today is marriage value, the uplift created by extending the lease, which the freeholder shares in once the term drops below 80 years. Cross that line and the premium jumps, then keeps climbing as the term shortens.
The cliff creates two rational behaviours. Sellers try to sell at 81 years and let the buyer carry the problem. Buyers of anything near the line should price as if the extension happens below 80, because by the time a purchase completes and a claim is prepared, the margin has usually gone. A lease length is a fact with a date on it: check the years remaining today, not the figure printed when the listing went live.
Pricing the extension before you offer
The premium has known components: compensation for the freeholder’s lost ground rent, the deferred reversion, and marriage value below 80 years. Professional valuers model these, and the Leasehold Advisory Service publishes guidance and a calculator that will get you to a working estimate. Add professional fees on both sides, because under the statutory route the leaseholder also bears the freeholder’s reasonable costs, a rule the government is consulting on changing but which applies today.
Then subtract the whole package from the long-lease value of the flat, and subtract a margin for time and uncertainty. That figure, not the asking price, is what the flat is worth to you. If the discount on offer is smaller than the all-in cost of the fix, the flat is not cheap. It is fully priced with extra steps.
The two-year wait has gone
One genuine improvement is already in force. The Leasehold and Freehold Reform Act 2024 abolished the requirement to have owned the flat for two years before claiming a statutory lease extension, with effect from 31 January 2025. A buyer can now start a claim immediately after completion in their own name.
That change killed the old workaround, where sellers commenced a claim and assigned it to the buyer on completion. Deals are simpler for it, but do not confuse procedure with price: claiming sooner does not make the premium smaller, it only removes a two-year drag on executing the plan.
Reform is legislated, not commenced
The same 2024 Act legislates for a new valuation scheme, including the abolition of marriage value. As of 1 August 2026 those valuation provisions have not been commenced, so premiums are still assessed under the existing law, and nobody can tell you with certainty when that changes or what the transition looks like. Our companion piece on the state of leasehold and commonhold reform tracks the wider programme.
Both errors around this are expensive. Paying a price that assumes marriage value disappears next quarter hands the freeholder’s windfall to the seller before the law exists. Refusing to acknowledge the reform at all means overpaying for freehold interests whose reversionary maths may weaken. Underwrite on the law in force, treat reform as optionality, and do not let anyone sell you certainty about commencement dates.
Lenders count the years differently
Mortgageability drops before value does. Most lenders want a comfortable unexpired term not just at application but at the end of the mortgage, so a 60-year lease that a valuer can price may still be a flat no mainstream lender will touch. That pushes short lease stock towards cash buyers, thins the exit market, and is precisely why the discounts exist.
Model your exit buyer before you buy. If the plan is to extend and then refinance, confirm the post-extension value and lending appetite with a broker first. If the plan is to extend and then sell, remember your buyer’s lender scrutinises the same lease, the ground rent terms included. Onerous ground rent clauses can block lending on their own, whatever the term length.
What this means for property investors
Treat every short lease flat as two transactions priced together: the purchase and the extension. Get the years remaining verified, estimate the premium and fees before offering, and buy only where the discount exceeds the all-in fix by a margin that pays you for the work and the risk. Since 31 January 2025 you no longer need the seller’s cooperation to claim quickly, so the execution risk sits mostly in the premium negotiation itself.
Check the building as well as the lease, because short leases cluster in older blocks where safety and service charge questions compound the tenure question. Our guide to the Building Safety Act for block buyers covers that side, and the flats on our books state lease lengths where known.
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