If you are buying or remortgaging a leasehold flat in London, the mortgage process involves checks that do not apply to freehold houses. Lenders look at the remaining lease term, the ground rent structure, service charges, building insurance, and whether there are any issues with cladding or building safety. Any one of these can delay or derail a mortgage application if it is not identified early.
Most flats in London are leasehold, so these checks affect a large share of the market. This guide explains the most common leasehold issues that can derail a mortgage in London, what lenders are looking for, and how to keep your transaction on track. It is written from a mortgage perspective, not a legal one — you should always take legal advice on the terms of any lease before committing to a purchase. For an overview of our London mortgage services, visit our London team.
Leasehold Mortgages at a Glance
Leasehold flats are found across London, from period conversions to modern apartment blocks. Many lenders require a minimum remaining lease term, often 70 to 85 years at the point of application, though criteria vary by lender and by mortgage term. Ground rent clauses that allow rent to double or increase above certain thresholds can cause lender concerns and may restrict mortgage options. Service charges and building insurance must be reasonable and transparent. Cladding and building safety issues can affect mortgage availability on some blocks. An absent or uncooperative freeholder can stall a transaction. A broker familiar with leasehold criteria can identify problems before they stall your application.
1. Short Leases: The Single Biggest Factor
The remaining term on the lease is the first thing a lender checks. If the lease is too short, many lenders will not lend. If it is marginal, it can restrict your choice of lender and affect the rate you are offered.
Many lenders require a minimum lease term, commonly in the region of 70 to 85 years remaining at the point of application, although requirements vary significantly by lender and mortgage type. Many also require a minimum number of years remaining at the end of the mortgage term — for example, at least 30 to 40 years unexpired when the mortgage is fully repaid. On a 30-year mortgage, that can mean needing well over 70 years on the lease at the outset.
The 80-Year Threshold
The 80-year mark is significant for a different reason: once a lease drops below 80 years, the cost of extending it increases substantially under current legislation because marriage value becomes payable. Lease extension and ground rent reform is evolving. The Leasehold and Freehold Reform Act 2024 includes provisions to remove marriage value from the calculation once the relevant provisions are in force, but implementation relies on further secondary legislation and timings remain uncertain. A draft Commonhold and Leasehold Reform Bill was published in January 2026 for pre-legislative scrutiny; proposals may change before anything becomes law. As at May 2026, lenders assess leases based on current terms, not anticipated reforms. For now, the 80-year threshold remains a practical consideration for buyers and remortgagers. Buyers should take specialist leasehold legal advice before relying on any assumed lease extension cost or future reform.
If you are looking at a flat with a lease below 85 years, it is worth getting specialist advice before making an offer. The cost of a lease extension can add a substantial sum to the transaction, and some lenders will not lend until the extension is completed or at least formally commenced. In London, short leases are common in older mansion blocks and period conversions, and purpose-built flats from the 1960s and 1970s originally granted 99-year leases may now have fewer than 75 years remaining.
2. Escalating or High Ground Rent
Ground rent is the annual charge payable by the leaseholder to the freeholder under the terms of the lease. Lenders are concerned not so much with the current amount but with how it can change over time.
Doubling Ground Rent Clauses
Some older leases include clauses that allow ground rent to double at set intervals — for example, every 10, 15, or 25 years. These doubling clauses are a significant problem for mortgage lenders. If the ground rent could rise to a level that exceeds the threshold at which the property might be treated as an assured shorthold tenancy under the Housing Act 1988, many lenders may decline the application. As a general reference, that threshold is often considered to be £1,000 per year in Greater London (and £250 per year elsewhere in England), but the legal and lending implications are technical and your solicitor should review the lease and confirm whether the wording creates an issue for the lender.
Lenders may also be cautious where ground rent is high relative to the property value, even without a doubling clause. New leases granted since June 2022 must have a peppercorn (effectively zero) ground rent, but many older London leases predate this and may have different terms. A broker can identify which lenders will accept the specific ground rent structure in your lease, and your solicitor can confirm the provisions before you commit.
3. EWS1 and Cladding
Since the Grenfell Tower fire in 2017, lenders have applied additional scrutiny to flats in buildings with external cladding. This primarily affects buildings over 11 metres, although lender requirements vary and can apply to lower-rise blocks depending on the materials used. London has a higher proportion of mid- and high-rise blocks than most of the UK, so this is a more common consideration in the capital.
For buildings where cladding is a concern, lenders may require an EWS1 form (External Wall System assessment), evidence that the building is covered by a remediation scheme or developer pledge, or a landlord certificate confirming the building’s safety status. If a building fails its fire safety assessment, or the freeholder cannot provide the documentation a lender requires, the property can be difficult or impossible to mortgage until the position is resolved.
The landscape has improved since the initial market freeze — many major lenders will now consider lending on affected buildings where remediation is underway or where the building has been assessed as safe, although requirements vary. If you are buying in a block over 11 metres or one with any form of external cladding, it is worth checking the building’s safety status early in the process. For more on cladding and external wall safety in London, see our London EWS1 and cladding guide.
4. High Service Charges and Major Works
Service charges cover the cost of maintaining the building and its communal areas. Lenders do not usually decline a mortgage because of service charges alone, but they can affect the affordability assessment because they are treated as a committed monthly outgoing. Unusually high service charges, or a history of large one-off demands for major works, can reduce the amount a lender is willing to offer.
This is a particular consideration in London, where apartment blocks — especially older ex-local-authority blocks — can carry significant service charges and may face expensive major works such as roof replacements, lift refurbishments, or external repairs. If the freeholder or local authority is planning major works and the anticipated bills are high, some lenders may be cautious about the financial liability passing to the leaseholder.
Before exchanging contracts, your solicitor should request a management pack from the freeholder or managing agent, which includes the current service charge budget, details of any planned or recent major works, the building insurance policy, and the accounts of any residents’ management company or right-to-manage company. Service charges are an ongoing cost that does not end when the mortgage is repaid, so understanding what you are committing to before you buy is important.
5. An Absent or Uncooperative Freeholder
Your mortgage offer will usually require your conveyancer to verify the freeholder’s compliance — typically confirming that ground rent and service charges are up to date and that buildings insurance is in place. If the freeholder is untraceable, is involved in an ongoing legal dispute with leaseholders, or if there has been a breakdown in block management, lenders may treat the property as an unacceptable risk.
This can be one of the harder issues to resolve, because it depends on a third party rather than on you or the seller. Identifying it early — through the management pack and your solicitor’s enquiries — gives the best chance of resolving it or deciding whether to proceed.
Other Leasehold Issues That Affect Mortgages
Building insurance. The freeholder or managing agent is usually responsible for insuring the building. Lenders require evidence that the building is adequately insured. If the insurance has lapsed, is insufficient, or does not name the lender’s interest, the mortgage offer can be withdrawn.
Restrictive covenants and subletting. Some leases contain restrictions that affect mortgage eligibility, such as restrictions on subletting, which can be relevant if you might need to let the property in future, or restrictions on running a business from the property or on certain types of use.
Flats above commercial premises. If the flat is above a shop, restaurant, or other commercial unit, some lenders will not lend or will impose additional conditions. This is common across London’s high streets, where residential flats sit above retail or hospitality premises. Lender criteria vary, and a broker can check which lenders are comfortable with the specific commercial use.
Non-standard construction. Some London blocks are built using non-standard methods, including certain post-war and high-rise construction types. These can limit the choice of lender. Criteria vary and a broker can identify suitable options.
Share of freehold. Some London flats, particularly in smaller converted buildings, come with a share of the freehold. This can be positive from a lender’s perspective, provided the lease, management, and insurance arrangements are acceptable, and it may give you more control over the building and the ability to extend the lease at minimal cost. Lenders will still check the lease terms and the arrangements for building management and insurance.
How to Keep a Leasehold Purchase on Track
Get a mortgage in principle early. Before you make an offer, confirm with a broker that the lease terms are likely to be acceptable to lenders. This avoids wasting time and money on surveys and legal work for a property that turns out to be unmortgageable.
Instruct a solicitor with leasehold experience. Leasehold conveyancing is more complex than freehold. Your solicitor needs to review the lease, check the ground rent provisions, request the management pack, and raise the right enquiries.
Request the management pack immediately. Delays in receiving the management pack from the freeholder or managing agent are one of the most common causes of delay in leasehold transactions. Ask your solicitor to request it as soon as they are instructed.
Check the lease term before making an offer. If the lease is below 80 years, factor in the cost and timeline of an extension. If the vendor has already started the statutory extension process, this can sometimes be assigned to you on completion — your solicitor can advise on how this works.
Raise cladding questions early. If the building is over 11 metres or has external cladding, ask the estate agent or seller for the building’s safety status before you commit to the purchase.
Why We Wrote This Guide
Fitch & Fitch is an independent, whole-of-market mortgage broker with offices in Canary Wharf, Cambridge, and Colchester. We are an appointed representative of JLM Mortgage Network, authorised and regulated by the Financial Conduct Authority (FCA Registration Numbers 955014 and 300629). You can verify this on the FCA Register at register.fca.org.uk.
Fitch & Fitch has received recognition from independent industry bodies including the Mortgage Strategy Awards, Mortgage Introducer Awards, and Legal & General Mortgage Club Awards. These awards are judged independently and can be verified on the respective awards websites.
We wrote this guide because we believe an informed buyer makes better decisions. For further information about our London mortgage services, visit our London hub page.
Frequently Asked Questions
Can I get a mortgage on a leasehold flat?
Yes. Many lenders will consider leasehold flats where the lease has sufficient remaining term, the ground rent is within acceptable limits, and there are no unresolved building safety issues. Leasehold is the common tenure for flats in England, and many purchases proceed without mortgage complications where the lease terms are acceptable. Problems arise when specific lease terms fall outside lender criteria.
Is it difficult to get a mortgage on a leasehold flat?
Not if the lease terms are within normal parameters. Most leasehold flat purchases proceed without mortgage complications. Difficulties arise with short leases, escalating ground rent clauses, cladding issues, an absent freeholder, or unusual lease terms. Identifying these early — before you commit to a purchase — is the best way to avoid problems.
What lease length do I need for a mortgage?
Many lenders require a minimum of 70 to 85 years remaining on the lease at the point of application, and some also require a minimum number of years unexpired at the end of the mortgage term, often 30 to 40 years. The most significant threshold is 80 years: once a lease drops below this, the cost of extending it can increase substantially under current rules because marriage value becomes payable. A broker can help identify lenders whose criteria may be suited to the remaining lease term on the property you are considering.
What does a 100-year or 99-year lease mean for a mortgage?
A lease length such as 99 or 100 years is the number of years remaining before the lease expires and ownership reverts to the freeholder. A lease of around 100 years is generally comfortably within most lenders’ criteria, though it is still worth keeping an eye on the term over time, as a lease shortens each year and the 80-year threshold becomes relevant as it approaches. The ground rent and other lease terms still matter regardless of the length.
What makes a flat unmortgageable?
Common reasons a flat may be difficult or impossible to mortgage include a very short lease, an escalating or high ground rent clause, unresolved cladding or building safety issues, an untraceable or uncooperative freeholder, inadequate building insurance, or certain non-standard construction types. Many of these can be identified before you commit, and some can be resolved, so specialist advice early in the process is valuable.
What is ground rent and why does it matter for a mortgage?
Ground rent is an annual charge paid to the freeholder. Lenders are concerned about clauses that allow ground rent to increase over time, particularly doubling clauses. If the ground rent could exceed relevant thresholds — often cited as £1,000 per year in Greater London — some lenders may restrict lending or require solicitor confirmation that the lease is acceptable. New leases granted since June 2022 must have a peppercorn (zero) ground rent, but older leases may have different terms.
What can’t you do with a leasehold property?
A lease sets out what you can and cannot do. Common restrictions include needing freeholder consent for alterations, limits or conditions on subletting, restrictions on running a business from the property, and rules on keeping pets or making structural changes. The specific restrictions are set out in your lease, which your solicitor will review. Some restrictions can also affect mortgage eligibility, which is why the lease terms matter to lenders as well as to you.
Will leasehold reform affect my mortgage?
The Leasehold and Freehold Reform Act 2024 and the draft Commonhold and Leasehold Reform Bill published in January 2026 signal further reform to lease extensions and ground rents. However, most provisions are not yet in force, and lender criteria has not yet changed to reflect the anticipated reforms. For now, lenders assess leases based on current terms, not expected changes.
What is an EWS1 form and do I need one?
An EWS1 form is an assessment of a building’s external wall system, introduced to help lenders assess fire safety risk. Whether you need one depends on the building’s height, the materials used, and the lender’s requirements. Many low-rise blocks built from traditional materials may not require an EWS1 form, but this depends on the building, the valuer, and the lender. For more, see our London EWS1 guide.
Next Steps
If you are buying or remortgaging a leasehold flat in London, a useful first step can be having the lease terms reviewed before you commit. A broker can check whether the lease length, ground rent, and building type are likely to be acceptable to lenders, and help identify any issues that need resolving before you proceed.
For further information about our London mortgage services, visit our London hub page.
Related Guides
EWS1 and Cladding Mortgages in London
Best Areas to Buy Property in London
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