The expression Tenant’s Improvements is used to describe a wide range of works, that are usually carried out by a tenant, at their own cost, and usually require the landlord’s prior approval. Tenant’s improvements may not necessarily increase the value of the demised premises, but can have an impact upon the future rent payable by a tenant.Section 19 (2) of the Landlord & Tenant Act 1927 provides that a covenant in a
the review period
the procedural steps for having the rent reviewed
whether or not time is of the essence in the service of notices
the basis of valuation, i.e. assumptions and disregards any hypothetical terms and conditions to be adopted
in default of an agreement, the procedure for the appointment and determination by a third party surveyor such as an Independent

lease against the making of improvements, without the consent of the landlord, is deemed to be subject to a proviso that consent will not be unreasonably withheld.As a condition of consent however, the landlord will often require:-
• The payment of a reasonable sum in respect of any damage to or diminution in the value of the premises or of any neighbouring premises also in the landlord’s ownership.
• The payment of the landlord’s legal and other proper expenses incurred in connection with the granting of consent, usually by way of a Licence.
• In cases where the improvement does not add to the value of the demised premises, a covenant from the tenant to re-instate at the end of the lease.
Most rent review clauses will include a provision whereby Tenant’s Improvements are ignored for the purposes of assessing the revised rental value.