Noise assessments are often required at the Planning stage of developments that may generate noise, and noise-sensitive developments which may be affected by noise. Some developments, such as mixed use, fall into both categories.
Potentially noise generating developments often require a Noise Impact Assessment to be undertaken. This normally requires existing ambient noise levels to be established, typically by undertaking measurements, and the impact of noise from the development to be established.
For large developments, it is often necessary to consider secondary effects, such as the impact of increased traffic on existing roads.