How to Challenge an Unlawful Rent Increase UK

Not every rent increase you dislike is unlawful. The distinction matters because it shapes your challenge.

For assured and assured shorthold tenancies, a landlord cannot simply send a text message saying rent is going up next month. They must serve a formal Section 13 notice using the prescribed government form. The notice must give you at least one month's notice for monthly tenancies, or one full rental period if that is longer. It must specify the new rent, the date it takes effect, and it must be the correct version of the form.

Since the Renters' Rights Act came into force on 1 May 2026, rent review clauses in tenancy agreements are no longer valid for private tenancies. If your tenancy agreement contains a clause allowing the landlord to raise rent by a fixed percentage each year, that clause no longer works as a standalone mechanism. The Section 13 route is now the only lawful path.

An increase is also challengeable even when the notice is formally correct, if the proposed rent exceeds the open market rate for a comparable property in your area. 'Unlawful' in a strict sense covers procedural failures; 'excessive' covers market-rate overreach. Both are grounds to go to tribunal. The outcome differs slightly: a defective notice can be dismissed entirely, while an excessive increase gets recalibrated to market rate by the tribunal.

Check the notice you received against the current prescribed form from GOV.UK before doing anything else. A surprising number of Section 13 notices are served incorrectly, and a defective notice is unenforceable.

Section 13 of the Housing Act 1988 is the mechanism your landlord must use. Here is what the process looks like from your end.

Your landlord serves the notice. You have from the date of service until the day before the proposed increase takes effect to apply to the First-tier Tribunal (Property Chamber) in England, or the Rent Assessment Committee if you are in Wales. The window is short. If the notice gives you one month and you miss the deadline, the new rent takes effect and your right to challenge is gone (Shelter England, 2026).

The tribunal then considers what the open market rent for your property would be. They look at comparable local properties, the condition of your home, local amenity, and any evidence you or your landlord submit. They can also inspect the property if necessary. The tribunal sets the rent they consider appropriate, which can be lower than what your landlord proposed, equal to it, or in rare cases higher if the current rent was already below market rate.

One critical point: you cannot use the tribunal to freeze your rent below its current level unless your landlord's notice is invalid. The tribunal determines market rate, not personal affordability. If your current rent is already below market, the tribunal outcome may disappoint you.

The process usually takes several weeks from application to hearing. You do not need a lawyer to apply, though legal support strengthens your evidence bundle considerably.

Winning at tribunal comes down to evidence. Specifically, you need to show that the proposed rent is above what a similar property in your area would command on the open market.

Gather these before you apply:

• The Section 13 notice itself. Check the date, the proposed rent, and whether the correct form was used.
• Your tenancy agreement. The tribunal needs to understand the terms of your tenancy.
• Comparable rents. Find at least three to five properties similar to yours, in the same area, currently advertised or recently let. Rightmove, Zoopla, and OnTheMarket are the standard sources. Screenshot the listings with dates, addresses, and asking rents.
• Property condition evidence. If your property has disrepair or lacks features that comparable properties offer, document it with dated photographs. A property in poor condition commands a lower market rent.
• Any correspondence with your landlord about the increase, including emails or messages.

The strength of your comparable evidence is the single biggest factor in the tribunal's decision. Vague claims that 'rents in my area are lower' carry no weight. Specific listings at specific addresses do.

If gathering this evidence feels overwhelming, Remedy Legal can help you build your evidence bundle and understand what the tribunal will and will not accept.

The application form for challenging a rent increase in England is the RENTS1 form, submitted to the First-tier Tribunal (Property Chamber). You can file online through the GOV.UK tribunal service or post a paper form.

You will need to include:

• Your name, address, and contact details
• Your landlord's name and address
• A copy of the Section 13 notice
• A copy of your tenancy agreement
• Your evidence of comparable market rents
• A statement of your grounds for challenge

After submission, the tribunal will write to both you and your landlord with directions. You will usually be asked to exchange evidence bundles with your landlord before the hearing date. Turn up prepared. Bring printed copies of everything, including the comparables.

For a detailed walkthrough of the RENTS1 form itself, see our RENTS1 Form: A Step-by-Step Tribunal Guide.

If you have an error in your notice, you do not necessarily need to go to tribunal at all. Write to your landlord first, pointing out the defect and asking them to reissue the notice correctly. Some landlords will do so. Others will not, and you will need to apply.

The Renters' Rights Act, which took effect on 1 May 2026, makes two changes that directly affect how you challenge an unlawful rent increase as a UK tenant.

First, it abolishes rent review clauses for private tenancies. Before May 2026, a landlord could include a clause in your agreement allowing annual increases by a set percentage, and that clause operated independently of the Section 13 process. That route is gone. Every rent increase now requires a valid Section 13 notice, giving every tenant the same right to challenge via tribunal (Essential Property Options, 2026).

Second, the Act prevents landlords from using the Section 21 no-fault eviction route to pressure tenants who challenge rent increases. Section 21 itself was abolished on 1 May 2026. Before that date, a landlord could respond to your tribunal challenge by serving a Section 21 notice, which made challenging the increase financially risky if you wanted to stay in your home. That threat has gone.

In practice: if you receive a Section 13 notice and the proposed rent seems above market rate, you can now challenge it without fear that your landlord will evict you in retaliation. The tribunal process is the intended check on landlord proposals, and the Act is designed to make it usable.

For more on what Section 21's abolition means for your tenancy, see Section 21 ends on 1 May 2026: what that means for your tenancy.

Knowing your rights and acting on them are two different things. The paperwork, the evidence gathering, the deadlines, and the uncertainty of tribunal are where most tenants stall.

Remedy Legal is an AI-powered legal platform built for UK tenants dealing with exactly this kind of dispute. It is not a law firm, but it gives you the structure and support to build a credible case without paying solicitor rates upfront.

For a rent increase challenge, Remedy can help in several specific ways. Its Instant Situation Assessment takes your details and gives you a clear read on your legal position, including whether your Section 13 notice appears valid. Its Tenancy Agreement Analysis lets you upload your agreement and get a breakdown of the relevant clauses, including any now-invalid rent review provisions. If you decide to challenge, Remedy's Tribunal Bundle Generation helps you organise your evidence, annotate documents, and prepare your submission.

The platform has three pricing tiers. A free tier gives you a situation assessment and access to data from past cases with no credit card required. A £40 one-time payment opens the full platform, including document storage, deadline tracking, tribunal filing support, and expert letter templates. If you want a human expert alongside you, the top tier charges a percentage of winnings only if you win.

Deadlines are the thing that catches tenants out most often. You must apply before the proposed rent takes effect. Remedy's deadline tracking feature exists precisely for that reason.

If your rent increase dispute also involves a landlord who has breached licensing rules or failed to protect your deposit, you may have additional claims running in parallel. Remedy's Landlord Assessment covers HMO licensing compliance, deposit protection, and gas safety certificates in the same assessment.

If your landlord tells you rent is going up without serving a valid Section 13 notice, the increase has no legal effect. You are entitled to continue paying your current rent until a valid notice is served and the process followed correctly.

Do not simply ignore the situation. Write to your landlord, stating that no valid Section 13 notice has been received and that you will continue paying the existing rent until the correct process is followed. Keep a copy of everything.

If your landlord then attempts to treat non-payment of the increased amount as arrears, or threatens eviction on that basis, that is a serious problem. Under the Renters' Rights Act 2026, a landlord cannot pursue a possession claim based on arrears that arose solely because of an unlawfully demanded rent increase. Do not let it escalate to that point if you can avoid it.

Remedy's Letter Drafting feature can generate a formal letter to your landlord citing the relevant legislation, which is often enough to resolve the issue without any tribunal involvement. A clear letter citing Section 13 of the Housing Act 1988 and the Renters' Rights Act 2025 tends to produce a faster response than a general complaint.

For a broader overview of the claims UK tenants can bring under recent legislation, see Renters Rights Act 2025: What Tenants Can Claim.