Sound Testing for Building Regulations: Requirements, Process and Compliance

It’s surprising how often people assume that once the walls are up, either brick or stud, the double glazing is in and the floors are down and carpeted, that the job is nearly done from a sound insulation point of view. In reality, sound testing for building regulations is one of the final and most critical steps in proving a building is compliant.

Anyone who has tried to sleep through a neighbour’s late-night TV, barking dogs, or heavy footsteps from above will know how intrusive sound can be when a building is not properly insulated or tested. According to the Chartered Institute of Environmental Health (CIEH), noise is the single largest issue of complaint made to local authorities in the UK. The NHBC Foundation has also found that noise remains a significant concern among occupants of new-build homes.

This is exactly why sound testing for building regulations compliance matters. Whether you are building from scratch, converting a high street unit into flats, or working towards final sign-off, sound testing plays a key role in ensuring buildings meet the standards set out in Approved Document E.

What is sound testing for building regulations and why does it matter?

Sound testing for building regulations checks how well walls and floors prevent sound from travelling between separate dwellings or spaces. There are two main types of sound measured during testing:

• Airborne sound (such as voices, TVs, or music)
• Impact sound (such as footsteps, dropped objects, or furniture movement)

To carry this out, acoustic engineers use calibrated equipment to generate and measure controlled noise between rooms. It is not subtle, but it is the most reliable way to assess how sound behaves in a completed building.

Good acoustic performance is not just about comfort and privacy, it is a legal requirement. Sound testing for building regulations is required to demonstrate compliance with Approved Document E. If your building does not meet the required standards, it cannot achieve Building Regulations sign-off.

Beyond compliance, getting it right avoids costly remedial work, delays to completion, and dissatisfaction from occupants.

When is sound testing required for building regulations?

Sound testing for building regulations is mandatory for most residential developments, including new houses, flats, and apartments. It is also required where buildings are converted into residential use, such as offices or retail units being turned into flats.

Any material change of use that creates new dwellings will trigger a requirement for sound testing under Approved Document E.

Approved Document E sets out clear requirements for how many tests are needed and how they should be carried out. Typically, one set of tests is required for every ten dwellings, although different construction types may require additional testing.

As part of your build programme, sound testing for building regulations compliance should be planned early rather than left to the final stages of construction.

How sound testing for building regulations works

On test day, the building must be at the correct stage of completion, with finishes installed, gaps sealed, and no disruptive activity in test areas. A loudspeaker is used in one room while measurements are taken in another to assess airborne sound. For impact testing, a tapping machine simulates footfall on floors.

All results are recorded using calibrated equipment and compiled into a formal report to demonstrate compliance.

A house may only require airborne testing between adjoining dwellings, whereas flats typically require both airborne and impact testing, particularly where units are stacked vertically. The exact requirements depend on layout and construction type.

Sound testing for building regulations: Approved Document E requirements

The results of sound testing for building regulations are measured against specific performance standards set out in Approved Document E:

• DnT,w + Ctr measures airborne sound insulation, higher values indicate better performance
• L’nT,w measures impact sound, lower values indicate better performance

For new builds:

• Airborne sound must achieve at least 45 dB (DnT,w + Ctr)
• Impact sound must not exceed 62 dB (L’nT,w)

For conversions:

• Airborne sound must achieve at least 43 dB
• Impact sound must not exceed 64 dB

How to ensure compliance with sound testing for building regulations

One of the most common mistakes on projects is leaving acoustics too late. Engaging an acoustic consultant at the design stage helps identify potential issues before construction begins.

Meeting sound testing for building regulations requirements is not just about adding insulation. It depends on using the right combination of materials and construction detailing, such as acoustic plasterboard, resilient bars, and appropriate floor build-ups.

Approved Document E should be used as a reference throughout the project to guide design, construction, and testing.

Avoiding failed sound testing for building regulations

The most common causes of failure are often simple:

• Gaps in insulation or poor sealing at junctions
• Untreated service penetrations through walls and floors
• Incorrect or poorly installed floor build-ups

These issues can usually be avoided with good preparation, clear detailing, and attention to workmanship on site.

How much does sound testing for building regulations cost?

The cost of sound testing for building regulations depends on the number and type of tests required, site layout, construction type, and location.

Providing drawings, build details, and programme information allows for accurate pricing and efficient scheduling.

Why choose enevo for sound testing for building regulations?

enevo provides experienced, independent acoustic testing across residential and mixed-use developments. The focus is not just on testing, but on helping projects achieve compliance efficiently.

Advice is practical and unbiased, based on what works for the building rather than tied to specific products.

As part of a wider building compliance offering, enevo supports projects across design, construction, and regulatory approval.

Book your sound testing for building regulations

Need a sound test or advice on compliance? Visit enevo.co.uk/expertise/sound-testing to request a quote or speak to the team.