Rent Increase Letter Wales: Why a Letter Is Not Enough

The Letter That Does Nothing

If you search for "rent increase letter template" and use a generic landlord letter to tell your Welsh contract-holder the rent is going up, it is a valid statutory notice only if it is substantially to the same effect as Form RHW12. If it is not, the letter alone does not change the rent; the landlord and contract-holder may instead agree a variation in writing, followed by a written statement of variation within 14 days of it taking effect.

This is not a technicality. Regulation 3(2) of the Renting Homes (Prescribed Forms) (Wales) Regulations 2022 allows a notice in a form "substantially to the same effect" as the prescribed form; a notice that does not meet that standard is not a valid Section 123 rent variation notice. For periodic standard contracts, the prescribed form is Form RHW12 — the "Notice of Variation of Rent".

Why Generic Templates Are Dangerous

Etsy, Gumroad and document-library sellers offer editable "Rent Increase Letter" templates for between £1.25 and £6.00. Analysis of these listings reveals two recurring problems:

Cross-border contamination. Many templates are written for English law — citing Section 13 of the Housing Act 1988 or the English Renters' Rights Act. Section 13 is not the rent-variation route for Welsh occupation contracts after 1 December 2022. Serving an English notice on a Welsh occupation contract is invalid.

Missing statutory components. Form RHW12 has six mandatory parts (contract type, landlord details, contract-holder details, dwelling address, rent variation and signature) plus compulsory page-two guidance notes explaining the contract-holder's rights. A generic letter or a modified template that omits any of these fails the "substantially to the same effect" test.

Where to Get the Right Form

Download the current official Form RHW12 directly from the Welsh Government portal at gov.wales. It is available in bilingual (Welsh/English) and English-only versions, at no cost. Do not rely on third-party reformatted versions unless you can verify they include every mandatory part and the statutory guidance notes.

What Goes in the Form

Form RHW12 requires:

• Part A: Tick "Periodic standard contract" (not "Secure contract").
• Part B: Landlord's full legal name and address, matching the Rent Smart Wales register.
• Part C: Every joint contract-holder's full legal name.
• Part D: The dwelling's full postal address.
• Part E: Current rent, proposed new rent and the date the new rent takes effect (after two full calendar months have elapsed from deemed service and at least 12 months from the last variation).
• Part F: Landlord's (or authorised agent's) signature and date.

The guidance notes on page two must remain attached.

Can You Add a Covering Letter?

You can include a covering letter alongside Form RHW12 — explaining the reasons for the increase, thanking the contract-holder for their care of the property, or giving practical details about updating standing orders. But the covering letter is not the notice. Form RHW12 is the notice. The covering letter supplements it; it does not replace it.

For the complete Form RHW12 walkthrough — including the date calculation worksheet, the service log and the pre-notice compliance audit — see the Wales Rent Increase Guide.

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