A letter arrives. The rent is going up. The immediate questions are rarely about the law — they’re about whether this is actually allowed, whether the new figure is reasonable, and what happens if it isn’t.
As of 1 May 2026, the answer to the first question has become considerably more precise in England.
There is now one statutory route to increase the rent
For most private assured tenancies in England, a landlord who wants to put the rent up must now use the statutory Section 13 process.
That means serving Form 4A, giving the tenant at least two months’ notice and following the statutory timing rules. Rent-review clauses — the old “rent increases every year by RPI” type of wording — can no longer be used by a private landlord to impose an increase simply because the clause remains in the tenancy agreement.
GOV.UK’s current guidance on rent increases sets out the new process.
There is an important qualification, though. This does not stop landlord and tenant negotiating.
A landlord must use the Section 13 process every time they increase the rent, even where the parties have already discussed or agreed what the increase should be. Once a valid Section 13 notice has been served, landlord and tenant can agree a figure that is lower than the proposed rent but still higher than the existing rent — or agree that the rent will not increase at all. They can also agree a reduction in rent separately.
So the new rule is not “landlords and tenants can no longer agree rent”. It is that a landlord cannot bypass the statutory process and impose a higher rent through an old rent-review clause, a text message or an informal conversation.
The basic rules are:
- the rent cannot normally be increased during the first year of the tenancy;
- increases are generally limited to once a year;
- the landlord must use Form 4A;
- at least two months’ notice must be given; and
- the notice and proposed start date must satisfy the statutory requirements.
The government publishes the current assured-tenancy forms, including Form 4A.
There are transitional rules for increases started before 1 May 2026. For example, a valid old Form 4 notice served before that date can still take effect afterwards. But an increase based only on a pre-existing rent-review clause that was due to take effect after 1 May 2026 does not survive the reforms.
What “market rent” actually means
The legal test for a challenged increase is not whether the tenant can comfortably afford it, nor whether the increase feels excessive as a percentage of the old rent. The tribunal is concerned with the open-market rent: broadly, what the property could reasonably command if it were being let on the open market.
That is a narrower question than it sounds.
Checking Rightmove, Zoopla or similar listings can give you a starting point, but advertised rents are not necessarily the strongest evidence. A flat advertised at £1,500 a month has not necessarily been let for £1,500.
HM Courts & Tribunals Service specifically says evidence from actual agreed lettings is usually stronger than advertisements.
And comparables need to be genuinely comparable. Location, property type, size, condition, furnishings, heating, glazing, appliances and other features can all matter. So can differences in what is included in the rent.
A three-bedroom house half a mile away is not particularly persuasive evidence for the market rent of a one-bedroom flat simply because both appear in the same postcode search.
If you think the increase is too high
You can ask the First-tier Tribunal (Property Chamber) to determine the open-market rent.
The crucial deadline is simple: the tribunal must receive your application before the new rent is due to start. Leave it until that date has passed and you can lose the normal opportunity to challenge that particular increase.
The current HMCTS application route uses Form MR1, with an online application also available. HMCTS publishes the application, evidence requirements and current procedure here.
There is currently a £47 application fee for most post-1 May 2026 private-rent applications, although tenants on a low income or certain benefits may qualify for help with fees.
The 2026 reforms also removed one of the biggest reasons tenants previously had for being nervous about challenging.
The tribunal may decide that the open-market rent is below the amount proposed by the landlord, or that the landlord’s figure is correct. But the rent you are required to pay following the determination cannot be higher than the rent the landlord originally proposed.
That means a tenant no longer risks challenging £1,300 and emerging from the tribunal with a liability for £1,400 simply because the tribunal thinks the market would support it.
What happens to the rent while you wait?
This is another important change.
If you refer the proposed increase to the tribunal in time, you do not start paying the new rent simply because the date in the landlord’s notice arrives while the case is still being considered.
If the tribunal reaches its decision after that proposed start date, the determined rent will usually start from the next rent-payment date after the tribunal’s decision.
That means the higher rent is not normally backdated over the months while you were waiting for the tribunal to decide.
The tribunal can also delay the start of the determined rent further — by up to two months from its decision — where starting it immediately would cause undue hardship.
Before you challenge, check four things
A tribunal application becomes much easier to think about if you separate four questions.
1. Is the notice itself valid?
Check whether it is Form 4A, whether your details are correct, whether the landlord has given enough notice and whether enough time has passed since the last increase. The tribunal can consider the legal validity of the notice as well as the proposed rent.
2. What would the property genuinely let for?
Look beyond one or two attractive asking prices. Try to find closely comparable properties and, where possible, evidence of actual agreed rents.
3. Is your property genuinely comparable with the landlord’s examples?
Condition can matter. So can size, layout, furnishings, heating, glazing, included appliances and local amenities. Photographs and a simple floor plan can be useful evidence.
4. Have you protected the deadline?
Do not wait for perfect evidence before applying. HMCTS expressly says you must apply before the proposed start date even if you are still gathering supporting material.
That last point is particularly important. Evidence can be added; an expired deadline is much harder to undo.
Where negotiation can still make sense
None of this means every proposed increase should go to a tribunal.
A direct conversation can sometimes achieve more than either party expects. A landlord may value a reliable tenant with a clean payment history enough to accept a smaller increase, particularly where replacing that tenant means advertising, referencing, possible void periods and uncertainty over who moves in next.
But the 2026 rules change how that negotiation fits into the legal process.
Even if you agree a proposed increase informally, the landlord still needs to follow the Section 13 process to make an increase in a mainstream private assured tenancy. And once a Section 13 notice has been served, the parties can agree a lower figure than the landlord originally proposed.
That gives both sides room to compromise without restoring the old system of informal or contractual rent increases.
The position outside England
The process above is England-specific. Rent-increase rules differ considerably elsewhere in the UK.
In Scotland, the current rules for most tenants with a Private Residential Tenancy require at least three months’ written notice and generally limit increases to once every 12 months. A tenant who disagrees must refer the increase to Rent Service Scotland within 21 days. Under the current system, the rent officer’s assessment of open-market rent can still be higher or lower than the figure proposed by the landlord. Scottish legislation contains future reforms intended to remove that higher-rent risk, but as of September 2026 the current official tenant guidance still warns that it exists.
In Wales, a landlord using a periodic standard occupation contract generally uses Form RHW12, with at least two months’ notice. The first increase can be made at any time during the contract, but subsequent increases cannot take effect less than a year apart. Wales does not have the same general post-2026 tribunal challenge system as England; tribunal rent-determination rights under the Renting Homes framework can depend on whether the occupation contract is a qualifying converted contract.
In Northern Ireland, the rules also changed recently. Since 1 April 2025, private landlords are generally prevented from increasing the rent within 12 months of granting the tenancy or within 12 months of the previous increase, and tenants must be given three months’ written notice of an increase.
So England’s new Form 4A, two-month-notice and First-tier Tribunal system should not be treated as a UK-wide rule.
This article has deliberately stayed focused on whether a rent increase is valid and how to challenge the amount. What happens if rent arrears develop, and the possession process that may follow, belongs in our Tenancies, Notices & Evictions section.
This article provides general information about rent-increase law in England as it stood in September 2026 and does not constitute legal advice. Different rules can apply to particular tenancy types, including social and regulated tenancies. If you are unsure whether a specific increase is valid or are considering a tribunal application, consider seeking advice from a housing advice service or solicitor.
