Section 13 Rent Challenges — How Tribunal Decisions Work

Section 13 and the tribunal process

Section 13 of the Housing Act 1988 — now extended under the Renters’ Rights Act 2025 — is the legal mechanism by which a landlord can propose a rent increase on a periodic assured tenancy. The landlord must use Form 4A, give at least two months’ notice, and can only propose an increase once every 12 months.

If a tenant believes the proposed rent is above open market level, they have the right to refer the notice to the First-tier Tribunal (Property Chamber) before the proposed increase takes effect. The tribunal then conducts its own assessment and issues a binding determination of the market rent.

What tribunals actually decide

The tribunal’s task is narrow but important: it determines what the open market rent for the property would be — that is, the rent that a willing landlord and a willing tenant would agree in a genuine arm’s-length transaction on the date of the hearing.

Crucially, the tribunal is not asked to judge whether the landlord’s proposed increase is reasonable or affordable. It is asked only what the market rent is. If the market rent equals or exceeds what the landlord proposed, the increase will stand.

The determined rent is then published on GOV.UK as a public decision document, including:

• The previous (current) rent before the proposed increase
• The proposed rent from the landlord’s Section 13 notice
• The determined rent — the tribunal’s binding finding of market rent
• The tribunal’s reasoning, including the comparables it accepted

Evidence tribunals use to set market rent

To determine market rent, the tribunal will typically consider:

Portal listings

Current asking rents on Rightmove, Zoopla, and OpenRent for similar properties nearby. These establish the upper bound of market expectation at the date of the hearing.

Agreed rents

Evidence of rents recently agreed on comparable properties — obtained from letting agents or landlords. These carry more weight than asking prices because they reflect actual transactions.

Previous tribunal decisions

Published determinations from the same tribunal for similar properties. These are treated as independent, judicially assessed benchmarks of market rent, and tribunals give them significant weight.

ONS and official rental data

Government rental indices such as the ONS Private Rental Market Summary Statistics may be referenced for broader market trend context, though they are rarely determinative on their own.

How previous decisions can help your case

Past tribunal decisions are among the most powerful evidence you can cite — precisely because they represent the tribunal’s own independent assessment of market rent for a real property, not merely an asking price from a portal listing.

A decision is most valuable as evidence when the comparable property:

• Is in the same postcode district or immediately adjacent area
• Has the same number of bedrooms and a similar property type (flat vs flat, house vs house)
• Has a decision date within the past 18–24 months
• Has a similar condition, finish, and floor area

Where a past decision differs from your property, note the difference and explain what adjustment you believe is appropriate. Tribunals expect this — a well-reasoned submission showing adjustments is more credible than simply listing decisions without analysis.

Understanding the rent chain in a decision

Every published tribunal decision contains what practitioners call the “rent chain” — the three figures that tell the full story of the case:

When the determined rent is below the proposed rent, the tribunal has found the landlord’s increase was above market level — useful evidence if your landlord is proposing a similar increase for a similar property.

When the determined rent equals or exceeds the proposed rent, the tribunal agreed the increase was at or below market — relevant context if you are assessing whether a proposed increase in your area is defensible.

Rent Report surfaces this rent chain for every tribunal decision we match to your postcode, so you can see at a glance how the tribunal ruled and whether the outcome is favourable evidence for your case.

How to cite a decision in your submission

When referencing a past decision in your tribunal bundle, use this format:

Keep citations concise. Three to five well-chosen and clearly explained decisions will carry more weight than a long list without analysis. The tribunal will appreciate that you have engaged seriously with the evidence rather than simply producing volume.