Everything you need to extend your lease

At Extension.Lease, we provide specialist lease extension valuations in the London Borough of Harrow together with expert advice on freehold purchase and collective enfranchisement across the borough, including Harrow-on-the-Hill, Wealdstone, South Harrow, Rayners Lane, Kenton, Stanmore, Pinner and Hatch End. We act for leaseholders across a broad range of property types – from mansion flats and period conversions around Harrow-on-the-Hill, to 1930s suburban maisonettes in Rayners Lane and Kenton, modern developments in Wealdstone, and a significant number of ex-local authority estates where leases were originally granted during the 1980s Right to Buy era.
We regularly advise leaseholders on estates including the Wealdstone Estate and Byron Estate; the Rayners Lane Estate and Alexandra Avenue blocks; the Grange Farm Estate in South Harrow; the Woodlands Drive and Roxeth Green areas; the Kenton Lane and Kingshill Estate; the Stanmore Park and Honeypot Lane blocks; the Broadfields Estate in Edgware (Harrow side); the Pinner Green and Love Lane estates; the Headstone Drive and Headstone Gardens estates; the Eastcote Lane and Northolt Road blocks; and the South Harrow and Roxbourne estates. These predominantly 1950s–1970s purpose-built local authority developments saw substantial numbers of 99-year and 125-year leases granted during the 1980s under the Right to Buy scheme, meaning many are now approaching or have fallen below the critical 80-year unexpired term where marriage value becomes payable under the Leasehold Reform, Housing and Urban Development Act 1993.
Harrow’s estate stock presents valuation considerations, including low- to mid-rise block configurations, maisonette-heavy layouts, varying ground rent structures from early Right to Buy leases, and differing sub-market values between prime Harrow-on-the-Hill, commuter-focused Rayners Lane and Kenton, and regeneration-led Wealdstone. Our lease extension valuations incorporate detailed analysis of lease length, ground rent provisions, relativity, deferment rates and marriage value to ensure statutory premiums are calculated precisely and defensibly.
We prepare comprehensive Section 42 valuation reports, advise on premium negotiation strategy and provide tribunal-ready expert advice where required, acting against private freeholders, housing associations and the London Borough of Harrow. Every valuation is supported by robust, up-to-date comparable evidence drawn from across Harrow-on-the-Hill, Wealdstone, Rayners Lane, Kenton, Stanmore and the wider borough, ensuring premiums are fully reflective of prevailing local market conditions and capable of withstanding scrutiny in negotiation.
We handle lease extensions for apartments in Cunningham Park Court, The Mount Apartments, and Harrow Mansions, as well as conversions along London Road. Ex-local authority stock includes the Cunningham Park Estate.
In Harrow Town Centre, we act on lease extensions for flats in Bradstowe House, Kings Court, and ex-local authority blocks within the Greenhill Estate.
Wealdstone lease extensions include ex-local authority flats on the Wealdstone Estate and Canning Road Estate, plus private developments such as Churchill Court and Hanover Court.
Our Kenton work covers flats in Kenwood Court, The Birches, and ex-local authority stock in the Belmont Estate.
In Pinner, we handle lease extensions for apartments in Elm Park Court, Marsworth House, and retirement developments such as Barons Court, along with ex-local authority flats on the Rayners Lane Estate.
Stanmore lease extensions include flats in Stanmore Place, Howard House, and ex-local authority stock in the Canons Estate.
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The cost of extending your lease depends on several factors, including whether your property is under the ownership of Tower Hamlets Council or a private freeholder.
In addition to the premium and the landlords recoverable costs, you’ll also need to budget for our fixed professional fee of £2,750 + VAT*, which includes all valuation, negotiation, and legal work. This fee is split into two equal instalments, making the payment process straightforward and manageable.
Contact us for a free all inclusive estimate of the total cost of your lease extension, without obligation.
Extending your lease is one of the most important steps you can take to protect your property’s value and mortgageability. If your lease is under 100 years or has a high ground rent, its value may already be affected. Once it falls below 80 years, the cost of extending increases significantly due to marriage value.
Our free, instant Lease Extension Calculator gives you an instant estimate of the premium payable under the Leasehold Reform, Housing and Urban Development Act 1993. It’s a quick, useful guide for leaseholders wanting to understand the likely cost of extending their lease before taking formal advice.
We have a proven track record working with leaseholders in Harrow, including properties under the ownership of the local authority and private freeholders. Whether you live in a purpose-built flat, a converted property, or a large housing development, we’ve handled it all
Everything you need to extend your lease






A statutory lease extension is a legal right that allows leaseholders to extend their lease by 90 years and remove any ground rent. This right is granted under the Leasehold Reform Housing and Urban Development Act 1993, and it applies to almost all leaseholders in the UK, whether your property is owned by a local authority or a private landlord.
The entire lease extension process typically takes between 6 to 12 months. This includes the valuation, notice serving, negotiations with the freeholder, and legal work to register the new lease. However, the exact time can vary depending on factors like the complexity of negotiations or if any issues arise with the property documents.
The premium is the price you pay to extend your lease. It depends on several factors:
Our surveyors will carry out a valuation to calculate a fair premium for your lease extension and negotiate where required to ensure you do not overpay.
If your lease has less than 80 years left, the cost of your lease extension will usually be higher. This is because properties with shorter leases are considered less valuable, and the cost to extend is affected by something called the marriage value, which is the increase in the property's value once the lease is extended. To avoid higher costs, it’s often best to act before your lease drops below 80 years.
Yes, your freeholder may charge fees for their involvement in the lease extension process. These fees typically cover the cost of legal work, including the drafting and registration of the new lease. While these fees are usually similar to the costs you incur, they can sometimes be higher depending on the freeholder's approach.