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 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.