Black Knight Secondary Glazing
Black Knight Secondary Glazing

Noise Levels

When considering secondary glazing for noise reduction it is important to understand what are considered normal noise levels in everyday experience. How noise is experienced will be different from person to person.


The following chart indicates what sort of noise is commonly experienced at various dB levels.

Recommended noise levels

The accepted residential noise levels are contained in BS8233: 1999: 'Sound Insulation and Noise Reduction for Buildings - Code of Practice'


These levels were based on studies first done by the World Health Orgainsation in 1980 and subsequently updated in 1999. Their recommendations were for a noise level not exceeding 35dB in living areas and 30 dB in bedrooms.



Some people are more sensitive to traffic noise, aircraft noise and general street noise than others but on average maintaining these sound insulation levels in domestic properties will allow conversations to be held without shouting and for TV or music to be enjoyed at a comfortable volume. In bedrooms, internal noise levels below 30dB allows for undisturbed rest.


Black Knight secondary glazing are independently tested to ensure that even the most stringent acceptable residential noise reduction levels are achieved.

Additional information

Measuring noise

Specifying for noise reduction