What counts as a short lease?
The term "short lease" has no fixed legal definition, but there are three key thresholds that every auction buyer must understand:
| Unexpired Term | Mortgage Position | Risk Level |
|---|---|---|
| 85+ years | Most mainstream lenders will accept (subject to standard criteria) | Lower |
| 80–85 years | Acceptable to most lenders; approaching the point where marriage value begins to apply | Watch |
| 70–80 years | Below 80 years: marriage value applies; some lenders restrict lending; extension urgently needed | High |
| 60–70 years | Most high-street lenders decline; specialist lenders only; significant extension cost | Very High |
| Under 60 years | Typically cash buyers only; extension cost can exceed £30,000–£50,000+ | Extreme |
The 80-year threshold is the most critical number in leasehold law. Below 80 years, marriage value is triggered under the Leasehold Reform, Housing and Urban Development Act 1993. This dramatically increases the cost of a statutory lease extension and is the primary reason why many short-lease properties at auction are priced at a steep discount.
Once a lease falls below 80 years, the calculation for a statutory lease extension changes. The leaseholder must pay the freeholder 50% of the "marriage value" — the increase in combined freehold and leasehold value created by the merger. On a £250,000 flat, this can add £15,000–£25,000 to the extension premium almost overnight when the lease passes the threshold.
Where to find lease length in a legal pack
The lease length must be confirmed from the primary documents, not from the lot description (which is routinely inaccurate on this point):
- Lease document — the first clause of the lease sets out the term. The key figure is the original term and the start date. To calculate the unexpired term: start date + original term = expiry date; expiry date minus today = unexpired term remaining.
- Title Register (A Register) — for registered leases, the title register entry includes the lease start date and original term. Cross-reference this with the lease document if both are in the pack.
- Management pack / LPE1 form — if a leasehold property information pack has been provided, the LPE1 form (prepared by the managing agent) typically states the current unexpired term.
Many legal packs describe a property as "leasehold" without including the lease itself. A missing lease is a serious red flag. You cannot know the unexpired term, ground rent, service charge obligations, or any restrictive covenants without reading the lease — and you should not bid without it.
Why the 80-year threshold is critical
Under s.48 of the Leasehold Reform, Housing and Urban Development Act 1993, a leaseholder who has owned a flat for at least two years has the statutory right to extend their lease by 90 years at a zero peppercorn ground rent in exchange for a premium. The premium is calculated using a formula that includes:
- The capitalised value of the ground rent (the amount the freeholder loses)
- The reversion value (what the freeholder's interest is worth)
- Marriage value — only applicable if the unexpired term is under 80 years
Marriage value is the increase in the combined value of the leasehold and freehold interests that results from extending the lease. Below 80 years, 50% of this marriage value must be paid to the freeholder. Above 80 years, marriage value is deemed nil by statute.
The practical effect is that a lease that drops from 81 years to 79 years can increase the extension premium by 20–40% on a typical residential flat — a difference that can easily run to £8,000–£15,000.
Financial consequences for auction buyers
A buyer who wins a leasehold lot at auction and then discovers the lease is shorter than expected faces serious constraints:
- Cannot apply for statutory extension for 2 years — you must own the property for 2 years before serving a Section 42 Notice to begin the statutory extension process. In the meantime, the lease continues to shorten.
- Restricted mortgage options — if the lease is under 70 years, most mainstream lenders will not offer a mortgage. You are limited to cash purchase or specialist lenders at higher rates.
- Informal extension — you can negotiate an informal extension with the freeholder immediately (without the 2-year wait), but the freeholder controls the price and the terms. You lose the protection of the statutory formula.
- Depreciation risk — a flat with 62 years remaining is worth measurably less than an identical flat with 90 years remaining. The discount accelerates as the lease shortens.
Cost illustration: 60-year lease on a £250,000 flat
As a rough illustration only (use the Leasehold Advisory Service LEASE calculator for accurate figures on any specific property):
- Extension premium (statutory): approximately £18,000–£28,000
- Buyer's solicitor fees: £1,500–£2,500
- Buyer's surveyor (RICS valuation): £500–£800
- Freeholder's solicitor fees (paid by leaseholder): £1,000–£2,000
- Total indicative cost: £21,000–£33,300
This is a cost that must be deducted from your maximum bid — it is a certain future liability, not a contingency.
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Analyse your legal pack — first analysis freeFrequently asked questions
What is a short lease?
A short lease is generally one with fewer than 80 years unexpired. Below 80 years, marriage value applies and extension costs rise substantially. Most high-street lenders require 70–85 years minimum. Below 60 years, a property is typically only purchasable with cash.
What is marriage value?
Marriage value is the increase in the combined value of the freehold and leasehold interests created by merging them through a lease extension. Under the 1993 Act, where the lease is under 80 years, the leaseholder must pay the freeholder 50% of the marriage value as part of the extension premium. This significantly inflates extension costs on shorter leases.
Can I get a mortgage on a short lease property?
Most high-street lenders require a minimum unexpired term at the end of the mortgage period — typically meaning 70–75+ years remaining today for a 25-year mortgage. Below 70 years, the property is generally cash-buyer only or requires a specialist lender. Confirm your lender's exact policy before bidding at auction.
How do I extend a short lease?
There are two routes: statutory (under the Leasehold Reform, Housing and Urban Development Act 1993 — grants a 90-year extension at zero ground rent, but requires 2 years' ownership before applying) and informal (direct negotiation with the freeholder — no ownership wait, but freeholder sets price and terms). Most auction buyers use the informal route or factor extension cost into their bid and apply statutorily after 2 years.
How much does lease extension cost?
Costs depend on the unexpired term, property value, and whether marriage value applies. Illustrative premiums only: 85+ years: £2,000–£5,000; 75 years: £5,000–£12,000; 65 years: £12,000–£25,000; 55 years: £25,000–£50,000+. Add £3,000–£6,000 for combined legal and surveyor fees. Use the Leasehold Advisory Service LEASE calculator for accurate figures on any specific property.
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