Cricklewood Glass - Quality Products & Services Since 1986

Now At Larger Premises: Unit 6d, Atlas Business Centre, Oxgate Lane, London, NW2 7HJ

Glass - Glazing - Secondary Glazing - Soundproof Windows - Splashbacks & Worktops -  Double Glazing & Units - Mirrors - Table Tops - In fact, Everything Glass!

Sound Insulation Windows, Sound Reducing Windows, Noise Reducing Windows

Sound Proof Glazing

Typical Noise Levels

In order to specify effective secondary glazing for sound reducing windows, we firstly need to understand what is normal and reasonable.

This varies from person to person, but the following chart should give you a good guide to different noise levels and what your personal tolerance levels are - and therefore to the level of sound proof glazing you should seek:

City Train One Hundred Feet Away about Eighty Decibels Noise Level Secondary Glazing London
Aeroplane on The Runway about One Hundred and Twenty Decibels Noise Level Secondary Glazing London
Traffic Noise Experienced in a City Centre Second Floor Flat about 77 Decibels, Secondary Glazing London

Typical Noise Levels Chart


0 dB The threshold of hearing
10 dB Normal breathing  
20 dB Rustling leaves  
30 dB Quiet office or library  
40 dB Residential ambient (background) noise  
40 dB Light rainfall  
50 dB Dishwasher  
55 dB Average office noise  
60 dB Normal conversation  
60 dB Vacuum cleaner  
70 dB Alarm clock  
70 dB Busy street Above 70 dB is considered hazardous and can result in hearing damage
75 dB Main road traffic at 30 mph  
77 dB 2nd floor flat in town centre  
80 dB Average factory  
80 dB Local construction activity  
80 dB Diesel train at 100 feet  
87 dB 3rd floor flat next to major arterial road  
90 dB Heavy goods vehicle  
97 dB Jet aircraft at 6000 feet preparing for landing Prolonged exposure at 90 dB can permanently damage the auditory nerves
100 dB Electric drill  
100 dB Beside a mainline railway  
110 dB Chainsaw  
110 dB Live rock music  
110 dB Car horn  
120 dB Aeroplane on the runway  
120 dB Emergency services siren 120 dB can cause pain and ringing in the ears
130 dB Pneumatic drill  
140 dB Fireworks At 140 dB, sharp pain and extensive destruction of the auditory nerves
155 dB Rifle shot  
160 dB Turbojet engine Immediate persistent ringing in the ears and massive destruction of the auditory nerves occurs at 160 dB

You can also download a simplified version of the above chart here pdf


Recommended Noise Levels

The accepted levels of internal noise for residential premises are contained in British Standard 8233: 1999: 'Sound Insulation and Noise Reduction for Buildings - Code of Practice'

These in turn were based upon the World Health Organisation recommendations of 1980 "Environmental Health Criteria 12: Noise" updated in 1999, which also stated:

“..... a level of less than 35 dB is recommended to preserve the restorative process of sleep.”

As can be seen on our Measuring & Perception of Noise page, any bedroom with a single glazed window overlooking a road in a busy town will be experiencing internal noise levels of about 50 dB - so installation of sound insulation windows would definitely be recommended.

World Health Organisation & British Standards for Acceptable Residential Noise Levels

Living Rooms 35 dB
Bedrooms 30 dB
Living Rooms Thirty Five Decibels is the Maximum Recommended Noise Level Secondary Glazing London
Bedrooms Thirty Decibels is the Maximum Recommended Noise Level Secondary Glazing London
Installation of Sound Reducing Secondary Glazing meets the Standards for Healthy Living Conditions, Secondary Glazing London

The standards apply to Living Rooms as well as to Bedrooms - so again, the installation of noise reducing windows would be advised for living areas as well.

Some of us are more sensitive to noise than others - but for the average person, maintaining the above standards in our homes allows us to:

  • enjoy our privacy undisturbed by outside noise
  • hold a conversation without having to shout
  • watch TV or listen to music at a comfortable volume
  • most importantly of all, get a good nights’ sleep!

Further information:

pdfDownload our Secondary Glazing Brochure

pdf Download Guidance & Info from Saint-Gobain - manufacturer of Stadip Silence acoustic glass

Thank you for visiting - please Contact Us if we can be of any further help.