Short Lease Properties: The Hidden Value Cliff Edge

A flat with a 95-year lease and an identical one with a 78-year lease can be worth noticeably different amounts, even sitting side by side. The reason is a genuine cliff edge in how leasehold valuation works, not just gradual decline.

Why lease length matters at all

A lease is a depreciating asset by design — you own the right to occupy the property until the lease runs out, at which point (absent an extension) it reverts to the freeholder. As the remaining term shortens, that right becomes worth less, all else equal, simply because there's less of it left.

The 80-year threshold

Below roughly 80 years remaining, something called "marriage value" typically becomes payable when extending the lease. The idea: extending a short lease increases the property's overall value (a longer lease is worth more than a short lease plus the freeholder's reversionary interest combined), and historically the leaseholder has had to share that uplift with the freeholder. This is on top of the underlying cost of buying additional years — and it's why extension costs don't rise smoothly as a lease shortens; they can jump meaningfully once you cross below 80 years.

Why this affects value even if you're not extending

Two things compound the effect: mortgage lenders increasingly want more years remaining than the mortgage term itself (commonly wanting at least 70-85 years left at the end of the loan), and buyers factor in the eventual extension cost when deciding what to offer. A short lease doesn't just cost more to fix — it also shrinks your buyer pool to cash buyers or those with unusually large deposits, which itself depresses the achievable price.

What to check if you own or are buying a short-lease property

• The exact remaining term as of today — not as of when you bought or when the lease was originally granted
• Whether you (or the seller) qualify to extend under statutory rights, which typically require having owned the property for a minimum period
• Whether an informal extension (negotiated directly with the freeholder) might be available and cheaper than the statutory route
• How the specific lender you're using treats the remaining term relative to your mortgage length

The practical takeaway

If a property's lease is anywhere near or under 80 years, get a specialist leasehold valuation before relying on any general comparable-sales estimate — the marriage-value effect is exactly the kind of factor a standard automated valuation, comparing against "similar flats nearby," won't correctly price in unless it specifically accounts for lease length.