Pests in rental property: who is responsible — landlord or tenant

Pest infestations in rental properties are one of the most common causes of landlord-tenant disputes. The question of who is responsible and who pays for treatment, depends on the nature of the infestation, how it arose, the condition of the property, and what the tenancy agreement says. This guide sets out the legal position clearly so both landlords and tenants understand their obligations.

Who is responsible for mice in a rental property?

The legal position on pest responsibility is not as simple as "landlord always" or "tenant always". Responsibility depends primarily on the cause of the infestation and the condition of the property.

The landlord is responsible when the infestation arises from a structural defect or disrepair in the property that allows pests to enter. Gaps in external walls or foundations, missing or damaged airbricks, holes around pipework, defective drains, or a poorly maintained roof can all provide entry points for mice, rats, and other pests. Under Section 11 of the Landlord and Tenant Act 1985, landlords are required to keep the structure and exterior of the property in repair. If the structure of the property is the reason pests can enter, the landlord is responsible for both the repair and the pest treatment.

The landlord is also responsible where the infestation existed before the tenancy started. A tenant who moves into a property and discovers a pre-existing mouse or rat problem is entitled to have it dealt with at the landlord's expense. This is another reason why a thorough check-in report and inventory at the start of the tenancy is important, documenting the condition of the property at the outset protects both parties.

The tenant may be responsible where the infestation arises from the tenant's behaviour, including poor food storage, excessive food waste, failure to keep the property clean, or failure to report early signs of a problem that has then become more serious. A tenant who stores rubbish inside the property, fails to use the bins provided, or leaves food accessible to pests may be considered to have contributed to the infestation and could be held responsible for treatment costs.

In practice, responsibility is rarely entirely one-sided. A property with minor structural vulnerabilities and a tenant whose housekeeping creates an attractive environment for pests will often see shared liability. The key question is: what was the primary cause?

Who is responsible for rats in a rental property?

The same principles apply to rats as to mice, structural defects or pre-existing infestations are the landlord's responsibility, while tenant behaviour that attracts rats is the tenant's. Rats are particularly associated with defective drains and broken drainage systems, which are structural issues and therefore the landlord's responsibility to repair. If a property has a blocked or cracked drain that is providing access for rats, the landlord must repair the drain and arrange treatment.

Local authorities have powers under the Prevention of Damage by Pests Act 1949 to require landowners to take steps to control infestations of rats or mice that present a health risk or damage risk to neighbouring properties. A landlord who fails to address a rat infestation in a rented property may find themselves subject to a notice from the local authority requiring action within a specified timeframe.

What should a landlord do when a tenant reports pests?

Act promptly. A tenant report of mice or rats should be treated as a maintenance report requiring investigation and response. Ignoring the report exposes the landlord to potential disrepair claims and, if the infestation has a structural cause, to the landlord's legal duty to repair being breached.

The first step is to investigate the cause rather than simply arranging treatment. A pest control company can identify entry points and evidence of the infestation's origin, and provide a report that helps establish whether the cause is structural or behavioural. If entry points in the structure are identified, these must be repaired as well as the infestation treated, treatment alone without addressing entry points will result in re-infestation.

Respond to the tenant in writing, confirm receipt of the report, and provide a realistic timescale for the inspection and treatment. Keep records of all communications, the pest controller's findings, and the works carried out.

What can be deducted from the deposit?

If the infestation is attributable to the tenant's behaviour and was not present at the start of the tenancy, the reasonable cost of professional pest treatment may be deductible from the tenancy deposit. The same evidence standards apply as for any deposit deduction — you need to show that the property was free of the infestation at check-in (via the inventory), that the infestation occurred during the tenancy, and that the cause was the tenant's actions rather than a structural defect. See our guide on handling tenancy deposit disputes fairly for how to build a strong evidence base.

Tenant obligations around pest prevention

Most tenancy agreements include a general obligation on the tenant to keep the property clean and to behave in a tenant-like manner. This includes responsible food storage, keeping waste in the bins provided, and reporting any signs of a pest problem early rather than allowing it to develop. A tenant who notices mouse droppings and fails to report them for months while the infestation grows is likely to share responsibility for the cost of treatment.

Including a specific clause in the tenancy agreement about pest prevention and the tenant's obligation to report infestations promptly is good practice, it sets expectations clearly and provides a contractual basis for any deposit deduction claim.

See our property inspection checklist for how to identify early signs of pest activity during routine inspections before they develop into a full infestation.

Also see: Repairs · Section 11 · Disrepair claims · Tenancy deposit · Check-in report · Inventory · Tenancy agreement · Fit for human habitation

Disclaimer: This article is intended for general informational purposes only and does not constitute legal, financial, or professional advice. Landlord and tenant law is subject to change, and the information in this article reflects the position at the time of writing. You should always seek independent legal or professional advice before taking any action in relation to your property or tenancy.