You visit your rental property for a routine inspection and discover someone living there who is not on the tenancy agreement. Your tenant has been subletting without your permission. This is a common scenario, and how you handle it matters. Act too hastily and you could find yourself on the wrong side of the law. Act too slowly and the situation becomes harder to resolve.
What Counts as Subletting?
Subletting occurs when a tenant grants a tenancy or licence to a third party to occupy all or part of the property. The sub-tenant pays rent to the tenant, who effectively becomes their landlord. This is distinct from simply having a partner, family member, or friend move in as a guest or occupier. The key difference is whether the third party has been granted exclusive possession of all or part of the property, typically in exchange for payment.
It is important to get this distinction right. A tenant's partner moving in is not subletting, even if they contribute to household expenses. A tenant renting out a spare room on a short-let platform probably is. A tenant who has moved out entirely and installed someone else in the property almost certainly is. If you are unsure, look at the practical arrangements: who is paying rent, who has the keys, and who is actually living in the property.
What Does the Tenancy Agreement Say?
Almost all tenancy agreements contain a clause that prohibits subletting without the landlord's prior written consent. Some prohibit it outright, while others require the tenant to seek and obtain your permission before subletting. Check your tenancy agreement carefully. If it contains a prohibition or a consent requirement, and the tenant has sublet without following that process, they are in breach of the tenancy agreement.
If your tenancy agreement is silent on subletting, the position is more complex. An assured tenant has an implied right not to sublet the whole of the property without the landlord's consent, but the position on subletting part of the property depends on the specific terms of the tenancy.
The Legal Consequences of Subletting the Whole Property
If a tenant sublets the whole of the property, the tenancy may cease to be an assured tenancy. Under Section 1(1) of the Housing Act 1988, a tenancy is only assured if the tenant occupies the dwelling-house as their only or principal home. When a tenant sublets the entire property and moves out, they no longer satisfy this occupation condition, and the tenancy ceases to be assured as a result. (Note that Section 15 of the Act deals with assignment and subletting of part, not with the loss of assured status through whole-property subletting.) Once the tenancy loses its assured status, the tenant loses the protections that come with it, which can significantly change the landlord's legal position and make it easier to regain possession.
Ground 12: Breach of Tenancy Terms
If the tenancy agreement prohibits subletting without consent and the tenant has done so anyway, this is a breach of the tenancy terms. You can seek possession under Ground 12 of Schedule 2 to the Housing Act 1988. Ground 12 is a discretionary ground, meaning the court will consider all the circumstances and decide whether it is reasonable to grant a possession order.
The court will look at the nature and seriousness of the breach, whether the tenant was warned and given an opportunity to remedy it, whether the subletting is still ongoing, and any other relevant circumstances. You must serve a Section 8 notice giving at least two weeks' notice.
Practical Steps: What to Do First
Before rushing to serve a Section 8 notice, take the following practical steps:
- Confirm that subletting is actually taking place, not just a guest or partner staying at the property
- Review your tenancy agreement to confirm the subletting clause
- Write to the tenant formally, setting out that you are aware of the subletting, that it is a breach of the tenancy agreement, and that they must either obtain your consent or end the sub-tenancy within a reasonable period
- Keep copies of all correspondence
- If the tenant remedies the breach by ending the sub-tenancy, you may decide not to pursue possession
- If the subletting continues despite your warning, serve a Section 8 notice relying on Ground 12
This graduated approach is important. Courts are more likely to grant a discretionary possession order if you can show that you gave the tenant a fair warning and an opportunity to put things right, and they failed to do so.
The Sub-Tenant Complication
If a sub-tenancy has been created, the sub-tenant may have legal rights of their own. This can complicate possession proceedings. If you obtain a possession order against your tenant, the sub-tenant's rights will generally end when the head tenancy ends, provided the sub-tenancy was not lawfully granted. However, this area of law can be complex, and if there is any doubt about the sub-tenant's status, seek legal advice before proceeding.
Distinguishing Subletting From Other Arrangements
Not every situation involving an additional occupier is subletting. Here are some common scenarios and how they differ:
- A partner moves in and shares the rent: this is typically not subletting, as there is no separate tenancy or licence granted
- A friend stays for a few weeks: this is a guest, not a sub-tenant
- The tenant rents out a room on Airbnb: this is likely subletting or at least a breach of the tenancy terms if the agreement prohibits short lets
- The tenant moves out and installs someone else: this is almost certainly subletting of the whole property
Take Action
Protect your property with a clear, enforceable tenancy agreement. Generate your complete document pack to get an RRA-compliant agreement with robust subletting clauses.
For more on your possession options, read our guide to Section 8 grounds for possession or check the full landlord compliance checklist for 2026.