How to Increase Rent Legally After 1 May 2026: Section 13 and Form 4A

If you are a private landlord in England planning to increase rent after 1 May 2026, the rules have changed in a way that catches a lot of landlords out. Contractual rent review clauses in your tenancy agreement — the ones that say "rent will be reviewed annually" or "rent will increase by RPI" — are void. The only lawful mechanism is a Section 13 notice using the prescribed Form 4A.

Get the procedure wrong and the increase is unenforceable. Here is exactly how to do it.

What is Section 13?

Section 13 of the Housing Act 1988 sets out the statutory procedure for increasing rent on a periodic tenancy. From 1 May 2026, every private tenancy in England is periodic, so Section 13 applies to every rent increase.

The notice must be given on Form 4A — the prescribed form available on GOV.UK. Using your own template, a letter, or a different form will not do. The form must be the prescribed Form 4A, completed accurately, and served correctly.

How much notice do I need to give?

Two months. The new rent cannot take effect any earlier than two months from the date the notice is served. If you want the new rent to apply from 1 September, the notice must reach the tenant no later than 30 June (allowing for service rules — see below).

A common mistake is to date the form 1 July and assume the new rent starts 1 September. If the notice is posted second-class on 1 July, the deemed service date is later, and the new rent date may have to be pushed back. Use first-class post or in-person delivery and keep proof.

How often can I increase rent?

Once every 12 months. You cannot serve a new Section 13 notice within 12 months of the last rent increase taking effect. If your tenant moved in on 1 May 2026 and you increased rent from 1 August 2026, the next earliest increase date is 1 August 2027.

If you serve a second notice inside the 12-month window, it is invalid — the rent does not change.

What about rent review clauses in my agreement?

Any clause in your tenancy agreement that purports to set a rent review schedule, link the rent to RPI or CPI, or specify an automatic increase is void from 1 May 2026. You cannot enforce it. You must use Section 13 with Form 4A every time.

The exception is rent increase by mutual agreement: if the tenant voluntarily agrees in writing to a higher rent, that agreement is enforceable as a variation of the tenancy. No form is required. But the tenant must genuinely consent — pressure or implied threats of possession make any such agreement vulnerable to challenge.

Can the tenant challenge the increase?

Yes. The tenant has the right to refer the proposed rent to the First-tier Tribunal (Property Chamber) before the new rent takes effect. The tribunal looks at the open market rent for a similar property in similar condition and sets the rent at that figure — but it can only confirm or reduce the rent. From 1 May 2026, the tribunal cannot set rent higher than the amount you proposed, even if the market rent is higher than your figure.

The risk for landlords is real but capped: if you propose a rent above market, the tribunal may reduce it to market and you have lost the upside. Pricing the increase at or just below evidenced market rent reduces the tribunal risk and protects the full proposed amount.

How to fill in Form 4A correctly

Form 4A is short but precise. The fields that catch landlords out are:

• Date of notice: the date you sign and serve, not the date the rent changes
• Address of premises: the full property address, exactly as it appears on the tenancy agreement
• Names of all tenants: every joint tenant must be named; a notice that misses one tenant can be invalid
• New rent: the full amount, not the increase. "£1,200" not "£100 increase"
• Date new rent takes effect: at least two months after service, and at least 12 months after any previous Section 13 increase
• Frequency: monthly, weekly, etc — must match the existing tenancy

A simple way to avoid form errors is to use a generator that pulls from your tenancy data. Our Form 4A generator does exactly this.

How to serve the notice

Service rules are the same as for any tenancy notice:

• Personal delivery before 4:30pm — same day
• Letterbox delivery — next working day
• First class post — two working days from posting
• Recorded delivery — risky; if refused or signed-for unavailable, it counts as undelivered

Email is not valid service for a Section 13 notice unless the tenant has given written agreement that email service is accepted. Default to first-class post or in-person delivery, and keep proof.

What happens after service?

If the tenant accepts the new rent, simply continue the tenancy at the new figure from the effective date. If the tenant refers the rent to the tribunal, you will be invited to provide evidence of comparable rents for similar properties in the area. Have your evidence ready — recent online listings, letting agent valuations, and rents on similar properties you let.

For the underlying figures, see our article on how rent increases work under the Renters' Rights Act.