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Your noise impact assessment

Add your noise sources and the nearest receptor. The assessment updates as you type, following BS 4142:2014 rating-level principles.

1. Site details

Site or project name

Address or postcode

Your name

Date

2. Nearest receptor

Receptor

Background LA90 (dB)

Assessment period

3. Noise sources

1 added

Source 1

Sound power LwA (dB)

Distance to receptor (m)

Barrier / ground attenuation (dB)

Acoustic features

Noise impact assessment

Untitled site

2026-11-05

Rating level

38.0 dB

Background LA90

40.0 dB

Difference

-2.0 dB

Low impact indicated

The rating level is below the background sound level. BS 4142 indicates a low impact.

Next step: Likely acceptable without mitigation. Confirm with measured background data if the receptor is noise-sensitive.

Levels at Nearest residential dwelling (daytime)

Source	LwA	Distance	Lp,A
Condenser units	75.0	20.0 m	38.0

Combined specific level: 38.0 dB LAeq
Acoustic feature correction: +0.0 dB
Rating level: 38.0 dB
Background (daytime): 40.0 dB LA90

First-pass screening using hemispherical free-field propagation and BS 4142:2014 rating-level principles. It is not a substitute for a measured BS 4142 assessment by a competent acoustician.