With National Tackling Drugs Week upon us, the National Landlords Association (NLA) is warning landlords about the dangers of cannabis factories in their rental properties.

Police forces across the country have reported a rising number of rented homes being used as illegal factories to grow cannabis. The damage caused to a property used as a cannabis farm can be catastrophic, with internal walls removed, the cost of repairs running into tens of thousands, and insurance companies potentially not paying out.

The factories not only produce cannabis, but also fund other illegal activity in the UK, such as the distribution of harder drugs and people trafficking. To stop this happening landlords have a responsibility to make sure they are aware of what is going on in their property.

Safety is also a concern. The properties themselves become a fire hazard due to amateur electrical wiring and the heat involved in the production of the plants. One factory in Hove tapped electricity directly from the mains; when the lights in the factory were turned on neighbours noticed all the lights on the road dim.

David Salusbury, chairman of the NLA, said: “Cannabis factories are a blight on local communities and make their neighbours’ lives a misery. We very much welcome any moves to track down where these factories are and shut them down.

“Of course, for landlords, it is once the police have cleared the property that the real challenge begins. Having to assess the level of damage and try and find the cash to make the property fit to rent once more. It is a horrible experience and is potentially avoidable if landlords follow some simple precautionary steps.”