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Our housing guidance site
"When a new tenancy begins we will normally offer joint tenancies to all married couples, couples with a registered civil partnership and couples who live together" Camden Council Tenancy Conditions.
See the full guidance here
A request for a joint tenancy between spouses, civil partners or partners would not usually be agreed if;
If a joint tenancy is refused for one of these reasons, a letter or email explaining why can be helpful even if you have spoken to the tenant.