Paragraph 1

Where the tenant, or any previous tenant, has made or contributed to the cost of an improvement on the premises comprised in the tenancy and the improvement is one to which this Schedule applies, then, if the tenant serves on the landlord a notice in the prescribed form requiring him to agree to a reduction under this Schedule, their rateable value as ascertained for the purposes of F1 section 1 of the Leasehold Reform Act 1967 shall be reduced by such amount, if any, as may be agreed or determined in accordance with the following provisions of this Schedule.

This Schedule applies to any improvement made by the execution of works amounting to structural alteration, extension or addition.