Can one joint tenant move out while the others remain?

Possibly, but one joint tenant leaving does not automatically remove them from the agreement while allowing everyone else to continue unchanged.

If you live in England

Under the rules for assured periodic joint tenancies, one joint tenant can usually serve valid notice that ends the entire joint tenancy. The remaining residents may be able to enter into a new tenancy with us, or all parties may agree to a tenant replacement. Speak to us before giving notice if others want to stay.

If you live in Dublin

The outcome depends on the Irish agreement & any permitted assignment or new tenancy arrangement. The landlord’s written agreement may be necessary, & the RTB registration may need updating.

• Tell us which tenant proposes to leave.
• Confirm who wants to remain.
• Ask whether a tenant swap or new agreement is appropriate.
• Expect identity & affordability checks where relevant.
• Agree how the departing tenant’s share of the deposit will be handled.

Until a lawful change takes effect, the existing tenants remain responsible under their agreement. Read the English guidance on joint tenancies for more detail.