A Landlord may require a Guarantor for the tenancy and the circumstances can differ for each individual application.
In general a Guarantor will be required where the applicant falls into one of the following categories:
Students/sharer tenancies
Tenants in receipt of Housing Benefit
Where a Tenant has detrimental credit against him/her
Where a Tenant has come into the country from overseas
Where a Tenant is unable to satisfy the minimum referencing criteria