Why leasehold risk gets missed
Most buyers focus on the physical condition of a property - the roof, the boiler, the windows. A home survey covers these in detail. But leasehold risk is legal and financial, not physical, and it falls outside the scope of any survey. By the time your solicitor raises lease issues, you may have already paid for a survey, committed emotionally, and spent weeks in the process.
The solution is to check for the most common red flags before you offer, using the information available in the listing, the Energy Performance Certificate (EPC), and the questions you ask the estate agent. For a broader set of viewing questions, see our guide on questions to ask at a house viewing.
Lease length thresholds
Lease length is the single most important factor in leasehold property value. As the lease gets shorter, the property becomes harder to mortgage, harder to sell, and more expensive to extend.
| Remaining lease | Impact |
|---|---|
| 90+ years | No material impact. Most lenders happy. Extension cost relatively low. |
| 80–90 years | Some lenders start to restrict. Extension should be planned but cost is reasonable. |
| 70–80 years | Below 80 years, 'marriage value' becomes payable - extension cost jumps significantly. Many lenders restrict or refuse. |
| 60–70 years | Most lenders will not lend. Property value materially reduced. Extension costs high. |
| Under 60 years | Cash buyers only. Severe discount to market value. Extension premium can exceed £30,000+ for a modest flat. |
What to do: Always ask the estate agent for the remaining lease length before viewing. If the listing doesn't mention it, that's itself a red flag. Check the Land Registry title (£3, available online) for confirmation. If the lease is below 85 years, factor the extension cost into your offer - and if below 70 years, take specialist legal advice before proceeding.
Service charge and ground rent issues
Service charges
Service charges cover the cost of maintaining the building - cleaning common areas, buildings insurance, lift maintenance, concierge, gardening, management fees, and contributions to a sinking fund (reserve fund) for major works. Annual service charges for a typical London flat range from £1,500 to £5,000+, and can be significantly higher for blocks with concierge, swimming pools, or extensive communal grounds.
Red flags:
- Service charges that have increased sharply year-on-year - request 3 years of service charge accounts
- No sinking fund or a very low sinking fund - this means major works will require a large one-off levy
- A managing agent with poor reviews or a history of disputes - search the First-tier Tribunal (Property Chamber) decisions online
- A very high management fee relative to the building size - some managing agents charge 15–20% of total spend
Ground rent
Ground rent is a charge paid to the freeholder simply for occupying the land. For new leases granted after 30 June 2022, ground rent is capped at a peppercorn (effectively zero) under the Leasehold Reform (Ground Rent) Act 2022. But older leases may contain escalating ground rent provisions:
- Fixed increases: Ground rent doubles every 10, 15, or 25 years. A £250 ground rent that doubles every 25 years reaches £1,000 within 50 years.
- RPI-linked: Ground rent increases with inflation - unpredictable but historically moderate.
- Percentage of property value: The most onerous. As property values rise, so does the ground rent - potentially reaching thousands per year.
What to do: Ask for the current ground rent and the escalation mechanism before offering. If the ground rent exceeds £250 in London (or £1,000 elsewhere) at any point during the lease, the property may be caught by the Housing Act 1988 assured tenancy provisions - making it significantly harder to sell and impossible for some lenders.
Major works exposure
As a leaseholder, you are liable for your share of major works to the building - roof replacement, structural repairs, lift replacement, external redecoration, cladding remediation, and communal system upgrades. These costs can arrive with little warning and run into tens of thousands of pounds.
Red flags:
- A Section 20 notice has been served - this means major works are planned or already approved
- The building has an outstanding cladding remediation requirement - post-Grenfell, many buildings require fire safety works that can cost £20,000–£100,000+ per flat
- The sinking fund is low or empty relative to the building's age and condition
- The building's last major works were more than 20 years ago - a large expenditure cycle is likely approaching
What to do: Ask the agent whether any Section 20 notices have been served or are planned. Ask for the current sinking fund balance. If the building is a post-2000 high-rise, check the EWS1 form status and whether a Building Safety Case has been prepared. For cost context, see our property repair costs guide.
Restrictions, consents, and resale problems
Leases contain restrictive covenants - rules about what you can and cannot do with the property. Common restrictions include:
- Subletting restrictions: Many leases prohibit or restrict subletting. If you plan to rent the property in future, check this before buying.
- Alteration consents: Most leases require the freeholder's written consent for structural alterations - and some charge substantial fees for granting it.
- Pet restrictions: Some leases prohibit pets entirely; others require consent.
- Assignment fees: Some leases require you to pay a fee to the freeholder when you sell (typically £200–£1,000).
- Notice of transfer and mortgage fees: Separate charges for notifying the freeholder of a sale or new mortgage - can add £200–£500 to transaction costs.
When a leasehold deal is still fine
Leasehold is not inherently bad. Many excellent properties - particularly well-managed purpose-built flats - are leasehold and work perfectly well. A leasehold property is generally fine if:
- The lease has 90+ years remaining
- Ground rent is low (under £250/year) with no aggressive escalation clause
- Service charges are reasonable and transparent, with a healthy sinking fund
- The building is well maintained with a responsive managing agent or resident-managed company
- No Section 20 notices are outstanding or imminent
- No cladding or fire safety remediation is required
- The freeholder is a reputable organisation, housing association, or the leaseholders collectively (share of freehold)
Share of freehold is the gold standard for leasehold. If leaseholders collectively own the freehold (or a share of it), they control ground rent, management, and major works decisions - removing most of the risks above.
When to walk away or renegotiate
Consider walking away from a leasehold purchase if:
- The lease is below 70 years and the seller is not willing to extend before sale or reflect the extension cost in the price
- Ground rent escalation will push it above the Housing Act 1988 threshold during the remaining lease term
- A cladding remediation levy of £20,000+ per flat is imminent or underway with no government funding confirmed
- The freeholder is unresponsive, and the building has a history of Tribunal disputes
- Section 20 major works are planned with no sinking fund to offset them
In many cases, the issue is not the leasehold itself but the price. If the seller acknowledges the lease length risk or imminent costs and prices the property accordingly, the deal may still work. Use documented costs to negotiate a realistic price. For more on when a property is genuinely not worth pursuing, see our guide on when to walk away.
Check leasehold risk before you offer
KeyWise helps you capture the key property details at a viewing - including tenure, lease length, and cost risks - so you can make an informed offer.
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Frequently asked questions
What lease length is too short to buy?
Most mortgage lenders require a minimum of 70–80 years remaining. Below 80 years, 'marriage value' becomes payable on extension, and costs rise significantly. Below 60 years, most lenders refuse to lend and the property becomes cash-buyer only at a steep discount.
Can I extend a short lease?
Yes. After owning for two years, you have a statutory right to extend by 90 years and reduce ground rent to zero. Costs depend on remaining length, property value, and current ground rent. Extending at 70 years on a £300,000 flat might cost £15,000–£25,000 in premium plus £2,000–£4,000 in professional fees.
What is a section 20 notice?
A Section 20 notice is a legal consultation requirement before the freeholder carries out major works costing more than £250 per leaseholder. It gives you the right to observe tendering, nominate contractors, and make representations. Check whether the process was followed correctly - non-compliance limits cost recovery.
Are ground rent increases legal?
Ground rent increases are governed by the lease terms. Fixed increases, RPI-linked, and percentage-of-value increases are all legal if specified in the lease. However, new leases after 30 June 2022 cannot charge ground rent above a peppercorn under the Leasehold Reform (Ground Rent) Act 2022.
About the author
Jag Singh is a Senior Quantity Surveyor with 18 years of experience across residential and commercial property. He founded KeyWise to help UK buyers use price, condition, repair-cost and local market data to make better decisions, negotiate with confidence, and secure the right property at the right price.