Tenant challenged your rent increase
The tribunal route, evidence that wins, what it costs you.
Any tenant served with Form 4A can refer the rent increase to the First-tier Tribunal (Property Chamber) before the new rent takes effect. The tribunal decides what the rent should be. The cost to the tenant is zero; landlords are responsible for their own preparation time.
Timeline
Tenant must apply before the new rent date stated on Form 4A. Tribunal acknowledges within 2-3 weeks, schedules a determination within 8-12 weeks. Most cases are decided on paper without a hearing.
Evidence you need
Comparable rent evidence: at least three similar properties in the same area let within the last 6 months. Rightmove, Zoopla, OpenRent listings. Letting agent valuations if you have them. Photographs of your property and the comparables to show similarity.
What weakens your case
Comparables that are not actually comparable (different bedrooms, different street, different condition). Comparables more than 6 months old. Aggressive proposed rent significantly above the comparables.
Possible outcomes
Tribunal confirms your proposed rent. Tribunal sets a lower figure (most common when the increase was aggressive). Tribunal sets a higher figure (rare, but possible if you under-shot market).
If you lose
The lower tribunal rent stands. You can serve a fresh Form 4A in 12 months. There is no appeal route except on a point of law.
Source: gov.uk Guide to the Renters' Rights Act 2025. Last verified 2026-05-09. This page is informational, not legal advice. For complex disputes, consult a solicitor.