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Industrial Noise Control

How To Measure Construction Noise

How To Measure Construction Noise.

The limit of noise during a typical construction hours is 75dBA

The Viable Option

Every site operator has the responsibility to ensure that the noise level does not exceed a reasonable level. This means they must do what they can to minimize the noise as well as keeping cost in mind. Even if the sound limit is not being exceeded, a lower sound level can easily be achieved to what is legally required.

Sound and Noise – The Decibel Scale

The decibel scale is a logarithmic scale where small increases have a significant effect. For example, 85 decibels is more intense than 75 decibels and 95 decibels is 100 times more intense. This scale has been used to truncate the numbers involved.

Adding decibels

An example of how decibels add together – if two workers of equal noise level operate together (each having a sound level of 75 dBA at 10 metres), the result will be a combined sound level of 78 dBA. This is a 3 dBA increase but the effect will be noticeable to most people.

Decibel Unit Standards


This is the noise level exceeded 10% of the time of the measurement. For example, a noise limit of L10 75 dBA means that over a period of one hour, the noise from construction activities can only exceed 75 dBA for a total of 6 minutes or, one minute every 10 minutes.


Leq represents a value known as Equivalent Continuous Sound Level. Leq, or LAeq as it is called, has become the preferred international descriptor for environmental sound and will be incorporated into all new standards.


The level exceeded for 95% of the time and is representive of the background noise level without any construction present.


The maximum level measured over a time period, but it is not as high as individual peak level.

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