Environmental Noise Impact Assessment

What is an environmental noise impact assessment?

An environmental noise impact assessment, or commonly referred to as a noise impact assessment, is an exercise of determining how the noise of a development activity and the development itself will impact on the environment.

Who conducts an environmental noise impact assessment?

Noise impact assessments are a complex issue and must be performed properly. It takes a qualified and experienced professional. In England, the noise assessment is typically be performed by qualified acousticians who are corporate members of the Institute of Acoustics.

Why do I need an environmental noise impact assessment?

If you are you planning a new build or converting an existing building, you must apply to your local council for planning permission. Your local council will decline your application or approve it with conditions. Within these conditions there will be a clause relating to environmental noise.

Which standard is used to assess environmental noise

BS 7445

BS7445: Description and measurement of environmental noise is used as the preferred standard to perform environmental noise assessments.

This is a multi-part document divided into the following parts:

  • Part 1: Description and measurement of environmental noise. Guide to quantities and procedures. It's better known as BS7445-1:2003, the guide to quantities and procedures

  • Part 2: Description and measurement of environmental noise. Guide to the acquisition of data pertinent to land use BS 7445-2:1991 ... Guide to the acquisition of data pertinent to land use

  • Part 3 Description and measurement of environmental noise. Guide to application to noise limits BS 7445-3:1991 ... Guide to application to noise limits



As every noise impact assessment is different to another, these can all be used to determine the noise impact on the environment.

We perform environmental noise impact assesssments:

  • for plant installations

  • for proposed residential developments etc.

  • and use BS4142 and BS8233 where appropriate

  • with BS7445

  • for laces of worship

  • for entertainment venues

How much does an environmental noise impact assessment cost?

We charge £60 per hour for a professional and chartered acoustics engineer, who is a corporate member of the Institute of Acoustics. Addtionally, we charge for the cost of the equipment hire, which is usually a few hundred pounds.

We provide you with a quotation once we have the full details of the noise impact survey requirement.

But the quickest and most efficient way to get a quotation, is to call us as soon as possible on 01908 643 433.

What is the procedure for a noise impact assessment?

A noise impact assessment is made up of several steps and are:


Scoping involves:

  • Initital engagement of the assessor with the site

  • Assessor must have a detailed understanding of the project

Establish a baseline

A noise measuremnt in different positions of the proposed dwelling loaction is required.

Prediction of noise levels

This is the prediction of the noise with reference to

  • Source characterisation

  • Propagation conditions

  • Receptor locations


The main objective of a noise assessment is to determine the effect of expected change in the acoustics environment due to the proposed development.


All adverse effects should be considered for mitigation. And have the following hierarchy:

  • Avoidance

  • Reduction

  • Compensation

Noise impact assessment report

A written report of the findings and mitigation measures.

Review and follow up of the noise impact assessment

Reviewed by the determining authority, i.e. the council in which the proposed dwelling is located.

Once satisfied with the report, permission to progress will be granted.

Environmental noise assessment background

The noise management document was written by DEFRA - Department for environment, food and rural affairs, which refers to a regulation and a framework, namely:

This regulation and framework calls for environmental noise assessments

How we help you!

As mentioned above, every environmental noise impact assessment is different, and therefore a good understanding is required. Once you approach us, we contact the authority that granted you conditional permission to build. We then request full details of what they want to see in the final report.

Thereafter, we provide you with a quotation for delivering exactly what the council or authority have requested. It is not just the report for which you are paying. You are paying for the permission to go ahead; therefore, you get a report that puts the council at ease so that they give you permission to continue.

With Environmentally Sound you get an efficient and cost effective service, as we find the most efficient way to deliver your report that will satisfy your local authority and grant you planning permission.

So, if you require an environmental noise impact assessment, please get in touch as soon as possible.

Please call us on 01908 643433

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