Planning Consultation Guidance Notes
4. Determination of impact of proposal involving commercial or industrial noise
Where a BS4142:2014+A1:2019 assessment is applicable this table gives a guide as to how BS4142 might interact with the Noise Hierarchy. However all applications with be judged on a case by case basis.
| Response | Examples of outcomes | Effect Level | Action | Approximate BS 4142 assessment |
|---|---|---|---|---|
| Not present | No effect | No Observed effect | No specific measures required | -10 |
| Present and not intrusive | Noise can be heard but does not cause any change in behaviour, attitude, or other physiological response. Can slightly affect the acoustic character of the area but not such that there is a change in the quality of life. | No observed adverse effect | No specific measures required | -3 -2 -1 |
| Lowest observed adverse effect level (LOAEL) | ||||
| Present and intrusive | Noise can be heard and causes small changes in behaviour, attitude, or other physiological response e.g. turning up volume of television: speaking more loudly, where there is no alternative ventilation closing windows for some of the time because of the noise. Potential for some reported sleep disturbance. Affects the acoustic character of the area such that there is a perceived change in the quality of life. | Observed adverse effect | Mitigate and reduce to a minimum | 0 +2 +4 +5 |
| Significant observed adverse effect level (SOAEL) | ||||
| Present and disruptive | The noise causes a material change in behaviour, attitude or other physiological response e.g. avoiding certain activities during periods of intrusion, where there is no alternative ventilation provision having to keep windows closed most of the time. Potential for sleep disturbance resulting in premature awakening and difficulty getting back to sleep. Quality of life diminished due to change in acoustic character of the area. | Significant observed adverse effect | Avoid | +7 |
| Present and very disruptive | Extensive and regular changes in behaviour, attitude or other physiological response and / or an inability to mitigate effect of noise leading to psychological stress e.g. regular sleep deprivation/awakening; loss of appetite, significant, medically definable harm, e.g. auditory and non-auditory. | Unacceptable adverse effect | Prevent | +8 +9 +10 |
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