Landlord Rent Increases: Rules, Process and Evidence

The legal framework for rent increases

Under the Renters’ Rights Act 2025 (which abolished assured shorthold tenancies), all periodic tenancies in England are assured tenancies. Landlords can only increase the rent once in any 12-month period, and only by serving a valid written notice in the prescribed form.

Critically, the new rent cannot exceed the market rent for the property. If the tenant considers the proposed rent to be above market value, they may apply to the First-tier Tribunal (Property Chamber) for a determination of the market rent. Once they apply, the rent increase cannot take effect until the tribunal has ruled.

This means that setting a rent that can be defended with evidence is both practically and legally important. A tribunal that determines a lower rent than proposed will set the new rent at the market figure, regardless of what you asked for.

How to serve a rent increase notice

To increase the rent on an assured periodic tenancy, you must use the prescribed form (currently Form 4 or its successor under the Renters’ Rights Act). The notice must:

• Be in writing using the prescribed form
• State the new proposed rent
• Give the date from which the new rent is to take effect (must be at least two months from the date of service for monthly tenancies)
• Be served in accordance with the tenancy agreement or by a method permitted by the Housing Act

A notice that does not follow the prescribed form, or does not give the required notice period, is invalid. An invalid notice means the rent cannot be increased and the tenant is not required to respond to it.

Setting a defensible market rent

The strongest protection against a tribunal challenge is to propose a rent that accurately reflects market conditions — supported by evidence you could present at a hearing if required.

Market rent is the rent at which a willing landlord and willing tenant would freely agree a new letting of the property at the date of the notice, on the assumption that the property is vacant and available in the open market. It is not the highest rent you could ask — it is the rent the market would bear.

To establish market rent credibly:

• Research comparable properties currently advertised in the same postcode area, with the same number of bedrooms and similar property type
• Adjust for differences in size, condition, floor level, and facilities
• Check recent tribunal decisions for similar properties — these give you the clearest indication of what a tribunal would determine
• Consider instructing an independent assessment — a professional market rent report provides independent evidence that is harder for a tenant to dispute

If your tenant challenges the increase

If your tenant applies to the First-tier Tribunal, you will be notified and given an opportunity to submit evidence. The tribunal will ask both parties to provide:

• Comparable rental evidence (listings of similar properties let or advertised in the local area)
• A description of the property (size, condition, features)
• Any other relevant market information

You should respond to every comparable the tenant cites, explaining any differences between those properties and yours and justifying any adjustment. The tribunal will review all the evidence and determine the market rent independently.

Presenting your case at tribunal

At the hearing, you may present your evidence in person or through a representative. Key tips:

• Bring printed copies of all comparable listings, with addresses, rents, and dates clearly shown
• Be prepared to explain any adjustments — why your property commands a higher rent than a comparable, for example, if it is larger or in better condition
• Be honest about your property’s condition. Tribunal members may have extensive local property knowledge.
• A professional assessment report — produced by a qualified surveyor or specialist rental benchmarking service — carries significant weight as independent evidence

Preventing disputes

The most effective way to prevent a tribunal dispute is to propose a rent that is clearly in line with market evidence — and to share that evidence with your tenant proactively. A tenant who can see that the proposed rent is supported by objective comparable data is less likely to challenge it.

A professional Rental Assessment is a cost-effective tool for landlords as well as tenants. By obtaining an independent market rent analysis before serving a notice, you can set a figure you are confident in and, if challenged, present the assessment as evidence at tribunal.