Frequently Asked Questions
What is Part E sound testing?
Often referred to as pre-completion sound insulation testing, Part E sound testing measures the airborne and impact sound insulation between adjoining dwellings.
It is carried out to demonstrate compliance with Approved Document E of the Building Regulations and is commonly required before Building Control will sign off a development.
What is the difference between airborne and impact sound testing?
Airborne sound testing measures noise travelling through the air, such as conversations, televisions or music passing through separating walls or floors.
Impact sound testing measures vibration travelling through a floor structure, such as footsteps, dropped objects or furniture movement. A calibrated tapping machine is placed on the floor above while measurements are taken in the room below.
Impact testing is only required where separating floors form part of the development.
How much does sound testing cost?
The initial residential sound test visit is £391.66 ex VAT.
Additional sound tests carried out during the same visit are charged at £100 ex VAT each.
How long does a sound test take?
A typical residential sound test usually takes between one and two hours, depending on:
- The number of tests required
- Site readiness
- Ease of access
- The size and complexity of the development
Larger developments or projects involving multiple plots may require additional time.
How many sound tests are required?
The number of tests required depends on the size, layout and construction of your development.
Building Regulations do not normally require every dwelling to be tested. Instead, a representative sample is selected based on the construction type and number of plots.
If you are unsure how many tests are required, we can advise before booking.
Can anyone remain in the room during testing?
No. For safety reasons and to ensure accurate measurements, nobody should remain in the rooms being tested while the equipment is operating.
During testing:
- Power tools should not be used nearby
- Vehicle movements should be minimised
- Loud construction activities should be paused
- The testing areas should remain as quiet as reasonably possible
Please note that the loudspeaker used during airborne sound testing can produce sound levels exceeding 110dB(A).
What if carpets or flooring have already been installed?
Where impact sound testing is required, the testing should ideally be completed before the final floor finishes are installed.
If carpets have already been fitted, at least 50% of the carpet should be capable of being lifted to allow the engineer to carry out the required testing.
How much notice do I need to give?
We recommend allowing 7 to 10 working days’ notice when booking your sound test.
Do you cover my area?
Standard pricing covers England and South Wales, subject to location.
Areas outside the standard coverage area may still be available on a price-on-application basis.
Can I add Part L or Part F testing?
Yes. Where practical, Part L air permeability testing and Part F ventilation flow testing can be arranged during the same site visit.
These services will be quoted separately.
What happens after I book?
Once your order has been placed, we will review the information provided and confirm availability with our sound testing partner.
Your final appointment will be confirmed as soon as possible.
What happens if the property fails?
A failed test means that the measured acoustic performance does not meet the minimum requirements of Approved Document E.
If this happens, the test report will identify the results and further investigation may be required.
Sound Insulation Store can provide advice on remedial works that may help improve the acoustic performance. Once the remedial work has been completed, the affected areas can be retested before certification is issued.