Under federal law, a landlord MUST permit a residential tenant with disability to make reasonable modifications to the premises only when the tenant:

While a landlord may request documentation regarding the necessity of modifications, federal law does not mandate that a tenant provide written proof from a physician. The focus is on the tenant's rights to make modifications, not on providing medical justification.

Federal law does not require tenants to obtain the landlord's approval or to provide multiple contractor bids before making reasonable modifications. While communication with the landlord can be beneficial, the law primarily emphasizes the tenant's right to modify the premises.

The length of the lease is irrelevant to the tenant's right to make reasonable modifications under federal law. Tenants with disabilities can request modifications regardless of the lease duration, as the law is concerned with accessibility rather than lease terms.