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AURACLE ACOUSTICS  -  PPG24

Introduction

Planning Policy Guidance Note 24 'Planning and Noise' (PPG24) was published by the Department of the Environment in 1994 with the objective of providing guidance to local planning authorities on the use of their planning powers to minimise the adverse impacts of noise arising from new developments.

Its introduction states: "Noise can have a significant effect on the environment and on the quality of life enjoyed by individuals and communities.  The aim of this guidance is to provide advice on how the planning system can be used to minimise the adverse impact of noise without placing unreasonable restrictions on development or adding unduly to the costs and administrative burdens of business."

To this end it recommends that where practicable noise-sensitive development should be separated from major sources of noise, and that where possible new noise-generating development should be sited away from noise-sensitive land uses. It points out that development plans provide a framework within which these issues can be balanced.

However, it acknowledges that the separation of significant noise sources and sensitive land uses is not always possible, and recommends that in these cases local planning authorities should consider whether it is practicable to effectively control or reduce noise levels through means such as planning conditions.

Noise Exposure Categories

A key feature of the document is the setting out of Noise Exposure Categories (NECs) for sites which are being considered for residential development and where noise from existing sources may be an issue. The four NECs, A, B, C and D, are defined in the first table below, all noise levels being expressed in terms of dB LAeq,T.

It is intended that these definitions are interpreted with some flexibility, and local planning authorities are permitted to move them up or down by up to 3 dB to take account of local conditions.  However, most local planning authorities adhere to the recommended figures.

In addition to the LAeq,T boundaries set out above, supplementary guidance is provided including the provision that sites where individual night-time noise events regularly exceed 82 dB LAmax (slow time weighting) should be treated as being in NEC C (unless the relevant LAeq,T figure corresponds to NEC D).

Guidance is provided for each NEC with a view to enabling local planning authorities to ascertain the suitablility of any given site for residential development so that appropriate and consistent planning decisions may be made.  This guidance is set out in the second table below.

The content of these tables and the passage in quotation marks above are reproduced directly from PPG24, are subject to crown Copyright, and are used here in accordance with the terms set out on the website of the Office of the Deputy Prime Minister.

PPG24 also makes reference to a number of other nationally adopted guidance documents      covering topics which include the monitoring and prediction of road traffic noise, railway noise and industrial noise (both permanent industrial sites and shorter-term activities such as construction sites and quarries), the measurement and assessment of the acoustic performance of building elements, and the evaluation of human exposure to vibration in buildings. 

Of particularly topical significance is Approved Document E 2003 'Resistance to the Passage of Sound', which is discussed on the 'App Doc E' page. Other documents referred to in PPG24 are discussed on other pages of this website which can be accessed via the Activies page.

Auracle Acoustics is able to undertake PPG24 assessments for all types of environmental noise, including liaison with with local planning authorities as required and the preparation acoustic reports in the support of planning applications.

 

 

Noise Exposure Category

Noise Source

A

B

C

D

road traffic
07.00 - 23.00
23.00 - 07.00


<55
<45


55 - 63
45 - 57


63 - 72
57 - 66


>72
>66

rail traffic
07.00 - 23.00
23.00 - 07.00


<55
<45


55 - 66
45 - 59


66 -74
59 - 66


>74
>66

air traffic
07.00 - 23.00
23.00 - 07.00


<57
<48


57 - 66
48 - 57


66 - 72
57 - 66


>72
>66

mixed sources
07.00 - 23.00
23.00 - 0700


<55
<45


55 - 63
45 - 57


63 - 72
57 - 66


>72
>66

 

 

 

 

 

 

 

 

 

 

 

Planning guidance

NEC A

Noise need not be considered as a determining factor in granting planning permission, although the noise level at the high end of the category should not be regarded as a desirable level.

NEC B

Noise should be taken into account when determining planning applications and, where appropriate, conditions imposed to ensure an adequate level of protection against noise.

NEC C

Planning permission should not normally be granted.  Where it is considered that permission should be given, for example because there are no alternative quieter sites available, conditions should be imposed to ensure a commensurate level of protection against noise.

NEC D

Planning permission should normally be refused.

 

 

 

 

 

 

 

 

 

 

 

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