1080. Rent not to be increased on account of tenant's improvements.

The following provisions apply where a person (the 'improving tenant') who is or was the secure tenant1 of a dwelling house2 has lawfully made an improvement3 and has borne the whole or part of its cost4.

In determining, at any time whilst the improving tenant, or his qualifying successor, is a secure tenant of the dwelling house, whether or to what extent to increase the rent, the landlord must treat the improvement as justifying only such part of an increase which would otherwise be attributable to the improvement as corresponds to the part of the cost which was not borne