A written agreement controls the use of the property and clearly states the position of the tenant and the landlord.
If there is a tenancy deposit to be paid, it would have to be protected using one of the official tenancy schemes, which would require a tenancy agreement.
When there is no tenancy agreement in place, the landlord is still required by law to provide the tenant with written details on the tenancy within six months from the start date. Since there’s a document involved, it’s often best to go ahead and do it all; correct, detailed and signed.
Tenants claiming benefits from the housing benefit office are usually required to provide signed tenancy agreements.
No written agreement could mean misunderstanding in the terms already discussed and agreed upon. A formal argument ensures both parties are in agreement with whatever specifications have been made.
Without a written agreement, a landlord cannot use the accelerated possession process to evict a tenant if needed.