Cardiff Damp and Mould: Student HMOs, Victorian Terraces and Welsh Landlord Law

Cardiff gets about 1,203 mm of rain a year at Bute Park, and 24.3% of its households rent privately, against 17.0% across Wales. Its inner suburbs, such as Cathays and Grangetown, are full of Victorian and Edwardian terraces, many of them let to students. Wales has its own landlord law, so the figures here are compared with Wales, not England.

Cardiff in numbers (compared with Wales)

• Private rented households: 24.3% (Wales 17.0%); social rented: 17.2% (Wales 16.5%)
• Terraced homes: 29.6% (Wales 26.6%); flats: 25.7% (Wales 11.7%)
• Homes with no central heating: 1.4% (Wales 1.2%)
• Overcrowded households: 3.9% (Wales 2.2%)
• River or sea flood risk: 0.9% (Wales 2.1%); surface-water risk: 0.8% (Wales 3.9%)
• Rainfall: about 1,203 mm a year at Bute Park, roughly a mile away

Why is the problem inside, not outside?

Flood risk across the council area is low on both measures, so damp in a Cardiff rental is rarely about rising water. It is about solid-walled Victorian buildings that are cold and wet through, and about occupancy. Overcrowding is 3.9%, well above the Welsh figure of 2.2%, and student HMOs pack many people into older terraces, which raises the moisture load and leads to condensation alongside fabric damp.

Rain on solid walls

Over a metre of rain a year tests gutters, pointing, chimneys and roof coverings. Penetrating damp tends to show where a defect is: below a leaking gutter, around a window head or under a failed flashing. Fix the cause first; a stain-block paint over an active leak only hides it.

The Ombudsman's findings

The Public Services Ombudsman for Wales has upheld findings of significant failings by Cardiff Council in responding to some damp and mould complaints. Whatever the tenure, the lesson is the same: a slow, dismissive or undocumented response is what turns a repair into a formal complaint.

What landlords must do in Wales

In Wales, the Renting Homes (Wales) Act 2016 makes fitness for human habitation, including freedom from damp and mould, an implied term of every occupation contract. The council can also assess damp and mould hazards using the Housing Health and Safety Rating System. The Homes (Fitness for Human Habitation) Act 2018 is England-only and does not apply here.

Awaab's Law applies in England only. For the position across the UK, see our guide to Awaab's Law and the private rented sector.

To find a specialist, see our Cardiff damp and mould page, and the council's private rented repairs page.