Lease extension calculator

Maximising the financial benefit from extending your lease is all about timing. If you have less than 60 years remaining on your short lease, remortgage may be virtually impossible. There may be minimal financial benefit to realise if you have between 60 and 70 years remaining. You should consider extending your lease if you’re approaching the 80-year mark, but as each case is unique, it’s worth getting impartial advice from a qualified surveyor before taking action.

Please remember that our calculator can only estimate the premium for a lease extension on your flat and doesn’t consider the landlord’s fees for which you are liable. You’ll also pay a stamp duty if the lease extension costs over £125,000. Therefore, the figure provided by our calculator should only be used for initial consideration purposes and not as evidence in court.

Evidence of similar flats in the same area is usually the main priority when assessing lease extension values. This requires local knowledge and experience that is beyond the scope of our lease extension cost calculator. If you need advice from a trusted, experienced, and local chartered surveyor, don’t hesitate to contact us at 020 7736 2383.

As you might expect, the size and location of your dwelling, lease terms and proposed length of extension significantly affect the total price of your lease extension. However, other fees that you should account for when determining the cost benefits of a lease extension include:

Both you and your landlord must follow strict procedures and time frames when you wish to extend your lease, assuming you choose to negotiate formally. The procedures outlined under the Leasehold Reform, Housing and Urban Development Act 1993 exist to protect your legal rights. Still, as discussed below, you don’t need to follow the guidelines if you wish to enter informal negotiations. The following lease extension advice will help you understand the lease extension process, but we’re only a phone call away if you have any questions.

The premium payable to the freeholder is negotiable if you opt for a voluntary agreement. However, in a statutory lease extension, the premium is calculated based on complex factors, and a professional valuation from a chartered surveyor is required.

In conclusion, extending your lease in London or the surrounding areas is a critical decision for any leasehold property owner, especially considering the potential impact on the property's value and securing a mortgage. The lease extension process, governed by the Leasehold Reform, Housing and Urban Development Act 1993, provides a statutory framework for leasehold enfranchisement and the right to manage.

As a qualifying tenant, you may be legally entitled to extend your lease by 90 years at a peppercorn ground rent. The former two-year ownership requirement was abolished on 31 January 2025, although other eligibility rules and the statutory procedure still apply. The landlord cannot refuse a statutory lease extension, and the freeholder's rights are limited. However, bear in mind that the cost of extending your lease is subject to a complex calculation, which considers factors such as the annual ground rent, remaining lease term, and market value of the property. A professional valuation from a chartered surveyor is essential for determining the likely premium payable for the extension.

A free online lease extension calculator will give you a general estimate of the extension cost and provide a reasonably accurate guideline to the likely premium. However, seeking professional advice and instructing a qualified solicitor specialising in leasehold reform is crucial to serving notice and handling the proceedings. Additionally, a valuation report from a chartered surveyor is necessary to ensure adherence to the statutory process.

If you prefer a voluntary agreement, you can approach your freeholder voluntarily to negotiate the extension cost. It is essential to consider the potential for escalating costs and the need for a professional lease extension valuation. However, the freeholder cannot refuse a statutory lease extension, and any disputes can be resolved through the Leasehold Valuation Tribunal.

When looking to extend your lease, it is crucial to understand the potential costs involved and the impact on the value of your property. Obtaining a professional lease extension valuation and engaging the services of a solicitor with expertise in leasehold reform will help protect your interests and ensure a smooth lease extension process. Always seek professional advice before taking action, and be prepared for the financial implications of extending your lease.