Leasehold properties — flats, maisonettes and an increasing number of houses sold on long leases — make up a significant portion of the UK buy-to-let market. They typically offer lower entry prices than equivalent freehold properties, are often in high-demand urban locations, and can generate strong rental yields. But leasehold ownership comes with a set of legal obligations, ongoing costs and potential complexities that freehold acquisition does not.

For a buy-to-let investor, the key is to assess these features accurately before committing to purchase — not after. This guide covers the leasehold-specific due diligence checks that every investor should complete before exchanging contracts on a leasehold property.

Leasehold vs Freehold: The Investment Difference

Leasehold ownership is ownership of a property for a fixed period — the lease term — rather than outright ownership of the land and building. The freehold (the underlying ownership of the land) is held by the freeholder or landlord, and the leaseholder’s rights and obligations are defined by the lease agreement.

For an investor, the practical consequences of leasehold ownership include: annual ground rent payments to the freeholder (in some cases), service charge contributions for the building’s maintenance and management, obligations to obtain consent before subletting or carrying out works, and an asset whose value and mortgageability is partly determined by the remaining lease length.

None of these features make leasehold property a poor investment — millions of successful buy-to-let portfolios are built entirely on leasehold flats. But they do require active management and a clear understanding of the lease terms before acquisition.

Lease Length: When Does It Become a Problem?

The unexpired term of the lease is one of the most commercially important metrics in any leasehold acquisition. As the lease term falls below certain thresholds, the property becomes harder to mortgage, harder to resell and potentially harder to insure. Extending a lease also becomes more expensive as the term decreases.

The key thresholds to understand are:

  • Below 85 years: many mainstream mortgage lenders begin to apply additional criteria or restrictions. Some lenders will not lend below this threshold.
  • Below 80 years: lease extension becomes significantly more expensive because the leaseholder loses the benefit of the ‘marriage value’ argument in negotiations. This is the point at which leasehold reform provisions take on particular significance.
  • Below 70 years: the pool of mortgage lenders reduces materially. Resale becomes progressively harder as more buyer-side lenders decline.
  • Below 50 years: the property is effectively unmortgageable for most buyers and significantly impaired for resale.

Investors should calculate the unexpired term carefully — not from the length of the original lease but from the original grant date to the current date to the expiry date. A lease granted in 1990 for 125 years has approximately 89 years remaining in 2026, not 125.

Where a lease extension is required, the statutory route under the Leasehold Reform, Housing and Urban Development Act 1993 (as amended) gives qualifying leaseholders the right to extend by 90 years at a peppercorn ground rent, subject to a premium. The premium is calculated by a specialist surveyor and can vary considerably depending on the property’s value, the lease length and local market conditions.

Ground Rent: What Changed and Why It Matters

Ground rent has been one of the most contentious issues in leasehold law in recent years. The Leasehold Reform (Ground Rent) Act 2022 prohibited the charging of ground rent (above a peppercorn) on new residential leases granted on or after 30 June 2022. However, many existing leases still contain ground rent provisions that predate this legislation.

For investors acquiring properties with existing ground rent obligations, the key assessment questions are:

  • Is the ground rent a fixed peppercorn amount (negligible), a fixed nominal sum, or a reviewable or doubling rent?
  • Does the ground rent or its review mechanism trigger any of the former ground rent doubling provisions that caused lender and conveyancer concern in recent years?
  • Would the current or projected ground rent exceed the threshold at which mortgage lenders will not lend — typically where the ground rent exceeds 0.1% of the property value annually, though lender criteria varies.

A ground rent that is currently modest but doubles every ten or twenty-five years may be acceptable today but problematic in the mid-term. The investor should model the ground rent trajectory against anticipated hold period and exit plans.

Service Charges: How to Assess Them Before You Buy

Service charges are the costs of maintaining, repairing, managing and insuring the building, apportioned among leaseholders in the proportions set out in the lease. They represent an ongoing cost that directly affects net yield and should be reviewed carefully before any acquisition.

When reviewing service charges as part of due diligence, investors should look at:

  • At least three years of service charge accounts, to understand the typical annual running cost and how it has tracked over time.
  • Whether a reserve or sinking fund is maintained — and at what level — for major works. A building with no reserve and an ageing roof or lift represents a pending cost risk.
  • Any section 20 consultation notices, which signal that major works are anticipated or in progress and that leaseholders are being consulted on costs.
  • The managing agent’s reputation and the freeholder’s track record, where this information is available or can be assessed from the accounts.

Service charges that appear low relative to similar properties may indicate under-management or deferred maintenance, both of which tend to crystallise as significant costs in the medium term. Service charges that appear high should be understood in context — a well-maintained building with a healthy sinking fund is generally a better investment than a cheap-to-hold building with deferred works.

Restrictive Covenants and Alterations Clauses

Most residential leases contain covenants that govern how the property can be used and altered. For buy-to-let investors, the most relevant provisions tend to be:

  • Subletting restrictions — many leases permit subletting but require the landlord’s prior consent. This is typically not withheld unreasonably, but the process should be confirmed before assuming the property can simply be let on a standard AST.
  • Restrictions on short-term lettings — some leases, particularly in newer developments, contain express prohibitions on Airbnb-style lettings or require written consent. This matters for investors considering flexible letting strategies.
  • Alterations clauses — any works requiring the freeholder’s consent may involve a licence fee, a management fee and potentially a surveyor’s fee, all of which add to the cost of refurbishment.
  • Use clauses — some leases restrict the property to residential use by one household. For investors considering HMO use, this would need to be checked and potentially resolved before conversion.

Leasehold Reform: What Investors Need to Know in 2026

The Leasehold and Freehold Reform Act 2024 introduced significant changes to the leasehold landscape in England and Wales. Among the key provisions are changes to the calculation of lease extension premiums, the abolition of ground rent for new extended leases, and improvements to the collective enfranchisement and right-to-manage processes.

For investors, the practical effect is that extending a lease has become more accessible in certain respects, and the ground rent payable on lease extension is now zero for properties within scope. However, the Act’s provisions are being brought into force in stages, and not all elements are yet in force. Investors should verify the current position — and particularly the impact on any specific lease they are considering — with their legal advisers.

Finance and Remortgage Risks

Many leasehold acquisitions are straightforward to finance. But certain leasehold characteristics can create mortgage problems that are worth identifying before rather than after exchange:

  • Short unexpired term (see above).
  • Ground rent that exceeds lender thresholds.
  • Properties in developments with cladding or fire safety issues that remain unresolved — a significant ongoing concern following the Building Safety Act 2022 and the remediation fund programmes.
  • High-rise buildings where lenders require an EWS1 form and the form is not available or is unfavourable.
  • Properties above commercial premises, which some lenders decline on residential terms.

For investors planning to refinance after improvement works, the ability to remortgage at the anticipated higher value should be modelled against these factors before acquisition.

Bidq reviews leasehold legal packs and highlights lease length, ground rent, service charge and covenant issues in clear, investor-focused language. Explore Bidq’s pre-bid legal pack review.