Roughly 22% of residential sales recorded by the Land Registry in 2025 were leasehold, not freehold — nearly a quarter of the entire market. Most leasehold BMV content treats a short lease purely as a risk to screen out, and we've covered that side in our red flags guide. This piece is about the other half of that same fact: a short lease is not just a risk, it's a mechanical, calculable discount to what the property would be worth with a long lease or freehold — and if you can price that discount correctly, it's one of the few BMV angles that doesn't depend on finding a motivated seller at all. The discount exists in the structure of the asset itself.
Why the discount is mechanical, not just sentiment
Lease value follows a well-established curve, not a straight line. Above roughly 100 years remaining, lease length barely affects value. Between 80 and 100 years it starts to matter. Below 80 years, "marriage value" kicks in under leasehold enfranchisement law — the freeholder is legally entitled to share in the increase in value created by extending the lease, which sharply increases the cost of extending and, correspondingly, deepens the discount buyers demand on the unextended property. Below around 60 years, mainstream mortgage lenders typically won't lend against the property at all, which shrinks the buyer pool to cash purchasers and pushes the discount deeper again, independent of the flat's condition or location.
This is the part generic "avoid short leases" advice misses: the discount is a function of years remaining and local ground rent/enfranchisement terms, not a vague penalty. You can model it.
What's actually on the market right now
Of the active listings on PropertyAlert with lease-length data recorded, a small minority currently show fewer than 80 years remaining — this isn't a common category of listing, but it's a persistent one, and most buyers scroll past it without pricing it properly rather than negotiating it properly. That gap between "avoided" and "priced" is where the opportunity sits.
How to price it instead of avoiding it
- Get the real extension cost. Don't estimate — get a formal Section 42 lease extension premium calculation, or at minimum a solicitor/surveyor estimate specific to the freeholder and ground rent terms. Generic online lease calculators give a ballpark; the marriage value component especially needs a real figure.
- Stack it like a refurbishment cost, not a separate deal. Add the extension premium, the freeholder's and your own legal costs, and roughly 12-24 months of process time to your total acquisition cost, the same way you'd stack refurb costs into a true-value calculation — see the BMV calculator for the full stacking method.
- Compare the stacked cost to long-lease comparables. If (purchase price + extension cost + fees) still lands meaningfully below what a long-lease equivalent unit is selling for locally, the discount is real and you've captured it. If it doesn't, the market has already priced the lease correctly and there's no edge.
- Check the two-year rule. Under current leasehold enfranchisement law you generally need to have owned the flat for two years before you can force a statutory lease extension, which affects both your holding-cost timeline and your exit options if you need to sell before extending.
Where this doesn't work
A short lease with an unreasonable or "hostile" freeholder — one who deliberately delays responses, disputes the premium, or has a history of litigation with leaseholders — can turn a mechanically-discounted opportunity into a multi-year legal cost centre. Freeholder identity and track record matter as much as the lease-years number itself. Check for existing leaseholder disputes on the building before you rely on the maths above.