To help protect our vehicles, the installation of factory fitted or home-fitted anti-theft devices, such as car alarms, is increasing. Faults can develop, leading to persistent sounding of sirens which can cause considerable distress to local residents.
As part of the Noise and Statutory Nuisance Act 1993, noise from vehicles in the street may be a statutory nuisance. We have powers to take action against people who allow this nuisance to happen. Car alarms are considered to cause a statutory nuisance if they sound for more than one hour, after which notices can be served on the vehicle's owner. The notice allows us to abate the nuisance, if necessary by forcibly getting into the vehicle or moving it to a suitable place to silence the alarm. We can also recover any costs incurred in doing this from the owner or the keeper of the vehicle involved.
By doing these things, you will avoid the possibility of having your vehicle removed. It is likely to be much cheaper than paying costs to silence the alarm if it causes a problem.
You can see more information in DEFRA - Bothered by noise leaflet