Sound Insulation Testing

Sound Test Airbourne Floor

Building Compliance Testing Limited can provide you with a fast and cost effective SITMA Accredited Pre-Completion Sound Insulation Testing across Mainland UK, in accordance with BS EN ISO140 and BS EN ISO16283.

green tick BCTSound Insulation Testing – Airbourne Floor

also known as acoustic testing, or pre-completion testing, testing must be carried out on new build properties as well as converted properties to demonstrate compliance with Approved Document E. A property will either require an Airborne test or an Airborne and Impact test. Airborne tests are carried out on separating walls and floors between habitable rooms of flats and houses which consists of placing a loudspeaker in one room for a steady source of noise. Several measurements are taken around the speaker. Measurements are then taken on the other side of the wall or floor. Impact tests are carried out on the separating floors between habitable rooms of flats and consist of a tapping machine is placed on the floor and measurements are taken in the room beneath. The tapping machine is placed on in 4 random location within the source room. Please ensure carpet is removed for this part of the test and access available to both sides of the floor.

Typically each test takes between ten to twenty minutes to complete. This all depends of the size of the building, the test locations, the ability to create stable sound field and unfortunately the uncontrollable influence of environmental noise.

Airbourne Floor:

When assessing the sound insulation of separating walls whether it be internal partitions or a party element, an airborne test is conducted to evaluate the transmission of airborne sound, including speech. This test involves the placement of a specialized omnidirectional loudspeaker in a source room, generating a high sound level uniformly in all directions for accurate insulation and reverberation time measurements.

A level difference is then recorded in the adjacent, upper, or lower receiving room, which is standardized to a reference value. The resulting airborne measurement provides a single numerical value that can be compared to established performance standards for sound insulation in walls.

A sound test for airborne noise transmission through a wall is a type of acoustic testing used to assess the effectiveness of a wall in preventing the transmission of sound from one space to another. This type of test focuses on evaluating how well a wall can block airborne sound, such as voices, music, or other noises that travel through the air.

The test typically involves the following steps:

  1. Test Setup: The test is conducted in a controlled environment, with a source room (where the sound is generated) and a receiving room (where the sound is being received). The floor to be tested separates these two rooms.

  2. Sound Generation: Sound is generated in the source room. This can be done using various types of sound sources, including loudspeakers, musical instruments, or human voices, depending on the specific testing scenario.

  3. Data Collection: Highly sensitive microphones and measuring equipment are placed in the receiving room to record the sound levels that penetrate the wall. The sound pressure levels are measured and analyzed at various frequencies.

  4. Analysis: The data collected during the test is then analyzed to determine the sound transmission characteristics of the wall. This analysis helps in quantifying how much sound is being transmitted through the wall at different frequencies.

  5. Results and Recommendations: Based on the test results, recommendations may be made for improving the wall’s acoustic performance. This might include adding additional sound insulation materials, sealing gaps, or making other structural improvements to reduce sound transmission.

Sound tests for airborne noise transmission are commonly used in various settings, such as residential buildings, commercial spaces, and industrial facilities. They are important for ensuring that walls provide sufficient sound insulation and meet building code requirements or industry standards. This testing is particularly valuable in environments where privacy, noise control, or compliance with noise regulations is essential.

The Standards

During Sound Insulation Testing, we adhere to British Standards that define the testing and rating of sound insulation for both Airborne and Impact Sound Insulation. These standards include:

  1. BS EN ISO 140-4 – This standard covers the measurement of airborne sound insulation between rooms, providing guidelines for field measurements.

    BS EN ISO 717-1 – This standard is all about rating airborne sound insulation, offering a framework for assessing and comparing sound insulation in building elements.


Building Regulations Approved Document E encompasses four key areas:

  • E1 – Protection against sound transmission from other parts of the building and adjoining structures.
  • E2 – Protection against sound transmission within a dwelling-house and similar areas.
  • E3 – Addressing reverberation in common internal parts of residential buildings, such as flats.
  • E4 – Ensuring appropriate acoustic conditions in educational facilities.

Part E of the Building Regulations sets forth guidelines for achieving reasonable standards of sound insulation in residential buildings across England and Wales. It applies to a wide range of spaces, from homes to hotels, and covers new constructions as well as those undergoing refurbishment or conversion from a different use.

The objective of Approved Document Part E is to enhance occupant comfort and well-being by minimizing noise transmission, both airborne and impact, between neighbouring homes and within internal spaces. Compliance with Part E necessitates the use of sound insulation systems that meet the required airborne and impact noise insulation levels, often accomplished using Robust Details.

For internal walls, a minimum airborne sound insulation level of Rw 40 dB (laboratory test results) is required. This applies to internal walls between bedrooms and other rooms, as well as between bathrooms and other rooms, excluding internal walls with doors. Internal floors must also meet a minimum airborne sound insulation level of Rw 40 dB.

Separating floors between new homes and purpose-built residential spaces must achieve a minimum airborne sound insulation level of 45 dB DnT,w + Ctr (or 56 dB DnT,w in Scotland), which is determined through on-site testing and differs from internal walls. For rooms resulting from a change of use or conversion, the minimum requirement is 43 dB DnT,w + Ctr (or 53 dB DnT,w in Scotland).

In terms of impact sound transmission, the maximum allowable level is LnTw 62 dB (or LnTw 56 dB in Scotland) for separating floors between new homes and purpose-built residential spaces. For rooms converted from a change of use, the maximum limit is LnTw 64 dB (or LnTw 58 dB in Scotland).

These standards and regulations ensure that sound insulation in residential buildings meets specified performance criteria, contributing to a more peaceful and comfortable living environment.


The Equipment

It’s no surprise that the equipment used for Sound Insulation Testing is exceptionally specialized and necessitates frequent, precise calibration for consistent accuracy. All of our measurement equipment adheres to the strict requirements of accuracy class 0 or 1 as outlined in IEC 60651 and IEC 60804. Before each measurement, the entire measurement system, including the microphone, undergoes adjustment using a sound calibrator. To uphold accuracy during field tests, all equipment employed by Building Compliance Testing is meticulously calibrated by a UKAS-approved laboratory. It’s important to note that Building Compliance Testing is a registered member of SITMA, ensuring our commitment to upholding industry standards and accuracy in sound insulation testing.

 Whether your requirements is for a domestic retrofit, residential or commercial development, Building Compliance Testing can support you from concept to completion by offering a one-stop-service service:

design reviews – site inspections – pretesting – intensity testing – site management training and education 

Other Services

We can also offer a variety of other specialist services through our Partners, including:

– Full Design Reviews and Specifications

– BB93 Acoustic Design of Schools

– BREEAM Internal Ambient Noise Limit (IANL) Measurements 

-Reverberation Time (RT60) Measurements


Sound Insulation Testing, also known as acoustic or pre-completion testing, is a crucial requirement for both new build and converted properties to demonstrate compliance with Approved Document E. These tests, either Airborne or a combination of Airborne and Impact, assess the sound insulation between habitable rooms. Airborne tests evaluate sound transmission through separating walls, while Impact tests focus on separating floors. Reverberation time (RT60) and background noise measurements, although essential in other contexts, are not factors affecting sound insulation test results. British Standards, such as BS EN ISO 140-4, BS EN ISO 140-7, BS EN ISO 717-1, and BS EN ISO 717-2, guide these tests, ensuring a controlled and standardized process to meet Building Regulations requirements. Building Compliance Testing employs specialized and precisely calibrated equipment to guarantee accuracy and compliance with industry standards throughout the testing process. Whether for domestic retrofit, residential, or commercial development, Building Compliance Testing provides comprehensive support from design reviews to site management, ensuring sound insulation standards are met from concept to completion.


Frequently Asked Questions

How do I prepare for a Sound Insulation Test?
  • Ensure 240v mains electrical outlet is available in all rooms to be tested.
  • Access to site is safe and to all the rooms throughout the building. If the adjacent dwelling is under
    different ownership it is your responsibility to ensure access is available for the testing.
  • All rooms where testing is to occur is vacated of all trades during the sound test.
  • All site staff are made aware of the sound test and the requirement to keep background noise to a
  • Any noisy building work in the vicinity of the sound testing will need to be stopped. This can be ground
    works, cleaning, paining, radios or beeping smoke alarms.
  • Ventilation extractor systems are to be turned off during the sound test.
  • For the impact test carpets are removed.
    The rooms in both sides of the separating element is ≥ 25 m3.
  • A set of sound test consists of two airborne wall tests, two airborne floor tests and two impact tests. This
    applies where the same construction in the walls and floors are used throughout the building. If different
    construction is used, then more sound tests will be required.

We’re friendly and knowledgeable bunch so why not get in touch for a chat. You can always contact Building Compliance Testing with any questions through phone, email or our online chat service.

Don’t worry, we don’t charge for advice given over the phone, so why not ask for a free quote?

01621 493 594 |

13 + 13 =

Let's Talk About Your Project?

Questions? We've Got Answers!

Find below a list of common frequently asked questions about Air Permeability Testing.