Short lease flats: the discount and the trap
A short lease is the most reliably mispriced discount in the market, in both directions.
A leasehold flat is a diminishing asset. The lease is a fixed term, and as it shortens the property becomes harder to mortgage and less valuable, at an accelerating rate once it drops below about 80 years. The reason for the acceleration is marriage value: below 80 years, the freeholder becomes entitled to a share of the value the extension creates, which makes extending much more expensive.
That creates genuine opportunities. A flat with 70 years remaining can trade at a substantial discount to an identical flat with 999 years, and the discount is frequently larger than the cost of extending. It also creates genuine traps, because the cost of extending is not always what the seller says it is.
How lease length affects mortgageability
Lenders apply their own minimum lease requirements, commonly requiring at least 70 years remaining at the end of the mortgage term, or 30 to 40 years remaining at application. A flat with a short lease may be unmortgageable entirely, which collapses the buyer pool to cash purchasers and depresses the price accordingly.
This is why the discount exists and why it can be substantial. It is also why the exit matters: if you buy a short-lease flat and do not extend it, you will be selling to the same restricted market you bought from.
- Many lenders require 70+ years remaining at the end of the mortgage term
- Below 80 years, marriage value makes extension significantly more expensive
- Below 60 years, the property may be unmortgageable with most lenders
- A lease of 80 years or less on a sale triggers the tenant's right to extend, but also the freeholder's entitlement to marriage value
- Statutory extension adds 90 years to the existing term and reduces ground rent to nil
The cost of extending
There are two routes. The statutory route, under the Leasehold Reform, Housing and Urban Development Act 1993, gives a qualifying leaseholder the right to extend by 90 years at a price determined by a formula, with a tribunal to settle disputes. The informal route is a negotiated premium agreed with the freeholder.
The statutory price has two components: the ground rent capitalised, and for leases under 80 years, marriage value split 50/50 between the leaseholder and the freeholder. Marriage value is the difference between the flat's value with the short lease and its value with the extended lease, which is why it is so significant on a short lease.
A leasehold valuation is a specialist job and the figures vary enormously by property. Before buying a short-lease flat, obtain a professional lease extension valuation — not the freeholder's estimate, and not the seller's.
When a short lease is a bargain
The calculation is straightforward in principle: compare the purchase price plus the cost of extending plus the legal costs against the value of an equivalent long-lease flat. If the total is meaningfully below the long-lease value, there is value to capture.
- Confirm the leaseholder qualifies for statutory extension — usually two years of ownership required
- Check the freeholder is identifiable and solvent, because a missing freeholder makes extension far harder
- Obtain a specialist lease extension valuation before exchanging
- Check for restrictions in the lease on alterations, subletting or use as a holiday let
- Establish whether the freeholder has already served any notices, or is a leaseholder-owned company
Common questions
- How short does a lease have to be before it is a problem?
- Below 80 years it becomes materially more expensive to extend, because marriage value applies. Below about 70 years many lenders will not lend at all, which reduces the buyer pool to cash buyers. Below 60 years the property can be difficult to sell to anyone but an investor, and the extension cost rises sharply.
- Can I extend a lease I have just bought?
- For the statutory route, you normally need to have owned the leasehold for at least two years. You can negotiate an informal extension at any time, but you have less leverage and no right to insist on a fair price. If you are buying a short lease specifically to extend it, check the two-year rule and plan around it.