Although this lease extension calculator can accurately estimate your potential premium, it should never replace getting a valuation from a Chartered Surveyor. Instead, this tool should only be used as a guide to help you better understand the potential costs involved.

Although it uses sophisticated algorithms and data, it cannot consider local factors that may impact your premium and can't give you a definitive figure. Instead, a registered Lease Enfranchisement Surveyor will be needed to create a final premium valuation used in your Section 42 Notice.