York Flood Risk and Heritage Homes: A Landlord's Guide to Damp and Mould

Two things set York apart from other Yorkshire cities. First, 5.1% of properties in the City of York area sit at medium or high risk of flooding from rivers and the sea, against 1.9% across England, around two and a half times the national rate. Second, a great deal of the housing is old, much of it listed or in a conservation area. Both complicate the usual advice on damp and mould.

What happens to a rented home after it floods?

Mould can start within a couple of days of walls and floors getting wet, but the bigger problem is how long solid masonry stays damp. Brick and plaster can hold moisture for weeks or months after the water has gone. Redecorating too early, or sealing walls with impermeable paint or render, traps that moisture and produces mould that returns. A sensible sequence is to strip out soaked materials such as carpets and insulation, dry the structure, take moisture readings until they settle, and only then replaster and decorate. A landlord should not hand the property back to a tenant on appearances alone.

How do you treat damp in a listed or conservation-area home?

York's rental stock includes Georgian and Victorian terraces within and around the walled city. Listed building consent is needed for alterations that affect a listed building's character, and conservation-area rules can restrict external changes. That tends to rule out external insulation and replacement windows in the older core, which makes internal ventilation improvements the practical route. Traditional buildings generally cope better with breathable materials such as lime plaster than with cement and plastic membranes, so conservation specialists are usually worth consulting before any damp-proofing work.

York in numbers

• About 85,000 households. Private renting: 20.0% (England 20.5%). Social renting: 14.0% (England 17.1%).
• Terraced homes: 23.8% (England 23.0%). Flats: 16.8% (England 21.4%).
• Overcrowding: 1.8% of households have fewer bedrooms than they need, well below the 4.4% for England. No central heating: 1.2% (England 1.5%).
• Flood risk: 5.1% of properties at medium or high risk from rivers and the sea (England 1.9%) and 4.3% from surface water (England 5.9%).
• Rainfall: 634 mm a year at Linton on Ouse, nine miles away and the nearest Met Office station with long-term data.

These are local authority figures from the 2021 Census, the Environment Agency and the Met Office. With modest rainfall and low overcrowding, the figures suggest that damp in York rentals is more often about water arriving from rivers and about old walls than about how crowded a home is.

What York landlords are expected to do

Councils can act under the Housing Act 2004 where damp and mould growth is a serious hazard, and tenants in England can rely on the Homes (Fitness for Human Habitation) Act 2018. Awaab's Law applies to social landlords only for now; the Renters' Rights Act 2025 provides for an extension to private tenancies, with a consultation closing on 18 December 2026 and no confirmed start date. Our private rented sector page has the detail. For a flood-hit or heritage property, a specialist survey before any treatment is money well spent: compare damp and mould specialists covering York on MouldPros.