Rent Increase Wales: How Landlords Increase Rent on a Periodic Standard Contract

The Statutory Route for Private Landlords

Since 1 December 2022, private residential tenancies within the scope of the Renting Homes (Wales) Act 2016 have been occupation contracts. If you let on a periodic standard contract and want to increase the rent unilaterally through the statutory route, you must follow Section 123 of that Act. The landlord and contract-holder may also agree a rent variation in writing; the landlord must provide a written statement of variation within 14 days of it taking effect. An informal request alone does not change the rent.

Section 123 is classified as a fundamental term, which means you cannot contract out of it. Even if your written statement contains a rent-review clause, the statutory procedure still controls when and how often the rent can change.

What Section 123 Requires

Three rules sit at the heart of the process:

1. Form RHW12 — For a statutory rent variation, serve the Welsh Government's prescribed "Notice of Variation of Rent" or a notice substantially to the same effect on every contract-holder. A letter, text message or generic template that does not meet that standard does not count.
2. Two calendar months' notice — The contract-holder must receive at least two full calendar months before the new rent takes effect. If notice is deemed served on 15 March, the two-month period runs through 15 May, so the earliest effective date is 16 May.
3. Once every 12 months — The new rent cannot take effect within 12 months of the last rent variation. The clock runs from the date the previous increase took effect, not from the date you served the notice.

Miss any one of these and the notice is defective — the contract-holder can legally continue paying the existing rent.

How to Serve the Notice

Section 237 of the Act sets three valid service methods:

• Hand delivery — Give the form directly to the contract-holder. Deemed served on that day.
• Post — Send or leave the form at the dwelling or the contract-holder's last known address. First-class post is deemed served on the second business day after posting.
• Email — Valid only if the contract-holder has given you explicit written consent to receive statutory notices electronically, naming the email address. A generic clause in the written statement is not enough.

Keep proof of service: a Certificate of Posting from the Post Office, a signed receipt for hand delivery, or the email headers plus the written consent document.

What Happens After You Serve

If the contract is a newly granted periodic standard contract (created on or after 1 December 2022), the contract-holder has no statutory right to challenge the figure. The new rent takes effect automatically on the date you specified, provided the notice is procedurally valid.

If the contract is a converted contract (an AST that existed before 1 December 2022 and converted automatically), the contract-holder can refer your proposed rent to the Rent Assessment Committee using Form RAC4 within two months of receiving your notice. The committee determines the open-market rent — it can set a figure lower, equal to or higher than what you proposed.

Before You Serve: A Quick Audit

• Confirm your Rent Smart Wales registration and management licence are both active — serving Form RHW12 while unlicensed is a criminal offence and invalidates the notice.
• Check whether 12 months have passed since the last rent variation took effect.
• Download the latest Form RHW12 from the Welsh Government portal.
• Calculate the deemed service date for your chosen delivery method, then allow two full calendar months to elapse before the earliest effective date.

The full compliance sequence — including the date calculation worksheet, a Section 237 service log and the contract classification checklist — is in the Wales Rent Increase Guide.

Key Dates for 2026

There is no statutory percentage cap on private rent increases in Wales. Social housing rent caps (the CPI + 1% formula) apply only to community landlords, not to private standard contracts. Media coverage of the English Renters' Rights Act does not affect Welsh occupation contracts at all — Section 13 of the Housing Act 1988 is not the rent-variation route for Welsh occupation contracts; Section 123 applies instead.

The Senedd has discussed affordability proposals in a White Paper, but as of October 2026 no general rent cap has been enacted for the private sector.

Get the step-by-step guide, the Form RHW12 walkthrough and every worksheet in one place — Wales Rent Increase Guide.

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