Neighbours of HMOs are suffering from the noises of HMOs, including from 'heavy hydraulic-sprung doors'. Many domestic/prefabricated properties (some with no cavity - just solid walls, thin party walls and no insulation/soundproofing) were not designed and built to accommodate those style of doors.
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Noise can cause health problems. Health effects of noise include anxiety and stress reaction and in extreme cases fright. The physiological manifestations can include headaches, irritability and nervousness, feeling of fatigue and decreased work efficiency. It is worth noting that these effects may not sound troubling, but the truth is, with time, the consequences can be very worrying.