In Wales, it depends
who your landlord is.

Under the Renting Homes (Wales) Act 2016, every occupation contract includes a term that the landlord must ensure the dwelling is fit for human habitation — at the start of the contract and throughout it. The Renting Homes (Fitness for Human Habitation) (Wales) Regulations 2022 list 29 matters and circumstances a court must have regard to, and damp and mould growth is the first of them.

This is not optional and your landlord cannot contract out of it, cannot charge you for meeting it, and cannot make you responsible for it in your contract. If they have not given you a written statement of your occupation contract, that is a separate failure worth mentioning.

The Welsh Housing Quality Standard was updated with effect from 1 April 2026 to set fixed timescales for hazards including damp and mould, for councils and housing associations. Where there is significant risk with likely imminent harm, the landlord must investigate within 24 hours and remedy within a further 24 hours. Where the risk is significant but harm is not imminent, they must investigate within 10 working days and remedy within a further 5 working days. If the work cannot be finished in that time, they must send you a written summary plan within 5 working days.

Social landlords must also publish their response times and report their performance to the Welsh Government — so the numbers above are not just guidance, they are something a landlord is measured against.

One caveat: this is a standard, not an Act of Parliament, so you cannot personally sue on the timescale itself the way you might sue on a breach of contract. What it gives you is a dated expectation and a regulator who is counting.

The April 2026 timescales above apply to social landlords only. If you rent privately, there is no fixed deadline — instead your landlord is bound by the continuous fitness duty covered above. That means they are not "in breach on day eleven" the way a Welsh social landlord now is under WHQS. They are in breach the whole time the home is unfit.

One practical consequence: as a contract-holder you are not liable to pay rent for each day, or part day, that the dwelling is unfit for human habitation.

Housing is devolved, so Britain now has three different systems. England's Awaab's Law came into force in October 2025 and applies to social landlords, giving them 10 working days to investigate and 5 to make the home safe. Scotland's version starts on 6 October 2026 and is the only one of the three that covers private landlords too. Wales has fixed WHQS timescales for social landlords since April 2026, and the continuous fitness duty for everyone else.

Expect to be told you are drying washing indoors and not opening windows. Sometimes lifestyle is genuinely part of it. But mould is also caused by cold surfaces, missing or broken extract fans, windows that will not open, poor insulation and heating too expensive to run — and those sit on the landlord's side of the line, because they are part of whether the home is fit.

If the extractor fan in your bathroom or kitchen does not work, say so explicitly in writing. It is a concrete defect, it is cheap to fix, and it undercuts the lifestyle argument immediately.

Your local authority assesses housing hazards under the Housing Health and Safety Rating System, which treats damp and mould growth as a hazard in its own right. Severity is judged partly on who is exposed, so a household with a baby, an older person or someone with asthma or COPD scores higher. Where the hazard is serious enough, the council can require the landlord to act.

None of the above applies to you directly — there is no landlord to pursue. But the diagnosis half of this tool still works, and it is worth knowing that most damp reported as rising damp turns out to be something cheaper: a leaking downpipe, ground piled above the damp-proof course, a blocked airbrick, or condensation. Get the cause identified before anyone sells you a treatment.