Part E · As Built Testing

Sound Insulation Testing
in Gloucestershire

Q: How quickly can you test in Gloucestershire?

Gloucestershire is under 45 minutes from our Worcester base. We typically have same-week availability and can often accommodate next-day testing for urgent requests. Contact us on 01386 365145 to check current availability.

Accredited airborne and impact sound testing across Cheltenham, Gloucester, Stroud, Tewkesbury and the Cotswolds. Reports within 24 hours. Can be combined with air tightness testing.

Book a Sound Test How the test works

24 hr

report turnaround
after test

Combined

with air tightness
on the same visit

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Same-week slots available across Gloucestershire

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Sound insulation testing in Gloucestershire

Accredited Part E testing across Gloucestershire — from Cheltenham to the Cotswolds.

Sound insulation testing equipment in Gloucestershire

Gloucestershire has a diverse development market — from apartment schemes in Cheltenham and Gloucester to barn conversions and new builds across the Cotswolds. We travel from our Worcester base in under 45 minutes, maintaining regular testing slots across the county. Our certificates are accepted by all local Building Control authorities.

Sound insulation testing measures how effectively separating walls and floors prevent sound from passing between adjoining dwellings. Airborne tests measure speech and music transmission (DnT,w + Ctr in dB); impact tests measure footstep noise through floors (L'nT,w in dB).

Part E of the Building Regulations requires all new build attached dwellings, apartments, and material change-of-use conversions to demonstrate acceptable sound insulation before building control sign-off.

Beyond compliance, good sound insulation is critical for resident satisfaction. Flanking transmission, poor junction detailing, and incomplete acoustic barriers are the most common causes of failure — all preventable with the right design-stage decisions.

Part E pass thresholds

≥ 45 dB

minimum airborne sound insulation (DnT,w + Ctr) — new build separating walls and floors

≤ 62 dB

maximum impact sound transmission (L'nT,w) — new build separating floors

Conversions have a relaxed standard. Material change-of-use projects require ≥ 43 dB airborne, reflecting the constraints of working within existing structures. The test methodology and preparation requirements remain the same.

The test process

What happens on the day of your sound test.

A typical set of airborne wall tests takes around two hours on site. We work with your site team to minimise disruption and move efficiently through the process.

Site readiness check

We confirm rooms are clear, finishes are complete, background noise is acceptable, and access is available to both sides of the separating element. Any issues are flagged before testing begins.

Airborne wall tests

A loudspeaker generates controlled pink noise in the source room. Sound levels are measured in both the source and receiving rooms across multiple frequency bands to calculate the DnT,w + Ctr value.

Impact floor tests

Where separating floors exist between dwellings, a standardised tapping machine is placed on the floor above while sound levels are measured in the room below to determine the L'nT,w impact rating.

Report & certificate

Test report issued within 24 hours. If the building passes, a compliance certificate is provided for Building Control submission. If it fails, we provide a written list of likely causes and remediation advice.

Preparation

Getting your building ready — and avoiding a re-test.

The most common cause of a failed sound test isn't poor construction — it's poor preparation on the day. Incomplete finishes, temporary floor coverings, and active construction noise in adjacent areas are the usual culprits, and all are avoidable with planning.

We provide all clients with a pre-test preparation checklist at the point of booking. For larger developments, we strongly recommend a design-stage review of the separating wall and floor build-ups to identify potential flanking risks before construction begins.

Sound insulation performance is heavily influenced by construction quality at junctions. Gaps in acoustic barriers, incomplete pointing, and bridged cavities can all compromise an otherwise compliant wall or floor detail.

Pre-test checklist

All windows and doors fitted and closedExternal openings must be fully operational and properly weather-sealed to control background noise levels.

Wall and ceiling finishes completePlaster skim coats, tape and jointing, and any acoustic board layers must be fully applied and set.

No temporary floor coveringsCarpet, underlay, and other soft floor coverings must be removed as they artificially improve results.

Skirting boards fitted and sealedGaps at floor-to-wall junctions are a common flanking path and must be sealed before testing.

No construction noise on siteBackground noise from power tools, generators, or adjacent works can invalidate test readings.

Access to both sides of the separating elementWe need access to rooms on both sides of the wall or floor being tested.

240v power supply availableOur testing equipment requires a standard mains power supply in both the source and receiving rooms.

Towns we cover in Gloucestershire

Sound insulation testing across Gloucestershire.

Regular testing slots across Gloucestershire for new builds, conversions, and apartment schemes.

Cheltenham

Sound testing for apartments, conversions, and attached dwellings in Cheltenham.

Gloucester

City centre and surrounding residential developments.

Stroud & the Stroud Valleys

Testing across the Stroud district including Nailsworth and Dursley.

Tewkesbury

New builds and conversions in Tewkesbury borough.

Cotswolds

Barn conversions, new builds, and attached dwellings across the Cotswold district.

Wider England & Wales

Nationally valid certificates. Contact us wherever your site is.

We also cover: Worcestershire, Birmingham & West Midlands, Bristol & Somerset, Warwickshire

FAQ

Common questions about sound insulation testing in Gloucestershire.

It depends on your development type. All separating walls require airborne testing. Separating floors between apartments require both airborne and impact tests. Houses do not have separating floors between dwellings, so only airborne wall tests are required for typical terraced or semi-detached houses.

If you're unsure which tests apply to your project, contact us before booking and we'll confirm based on your building type and configuration.

If a test fails, our report will include the measured result, the shortfall against the required standard, and guidance on the most likely causes. Common reasons include flanking transmission, unsealed gaps around service penetrations, incomplete skimming of party walls, or missing/incorrectly installed acoustic membranes.

In most cases we can advise on targeted remedial measures that don't require demolition of the separating element. Once remediation is complete, a re-test is arranged.

Yes — this is something we actively encourage for developments that require both tests. Combining air tightness and sound insulation testing on the same site visit reduces programme disruption, cuts travel costs, and means a single attendance covers both compliance requirements.

If you are also working with us on SAP calculations, we can align the testing visit with your as-built assessment timeline to make the completion process as efficient as possible.

Yes, conversions are one of the most common project types in Gloucestershire, particularly barn conversions across the Cotswold district. Part E applies to all material change-of-use projects, and the relaxed 43 dB airborne standard applies to conversions rather than the 45 dB new build threshold.

We have extensive experience testing converted agricultural buildings and can advise on realistic performance expectations for different construction types.

Gloucestershire is under 45 minutes from our Worcester base, so we can respond quickly. We typically have same-week availability and can often accommodate next-day testing for urgent requests. Contact us on 01386 365145 to check current availability.

A standard set of tests for a typical pair of semi-detached or terraced houses — two airborne wall tests — usually takes around two hours on site. For an apartment block requiring airborne wall tests, airborne floor tests, and impact tests, allow a full working day depending on the number of units.

We work efficiently and aim to minimise disruption to your programme. For larger developments we agree a testing schedule in advance that aligns with your completion phasing.

Yes. Part E makes a distinction between new build and material change of use (conversion) projects. The minimum performance standard for conversions is slightly relaxed — 43 dB DnTw + Ctr for airborne tests rather than 45 dB — to account for the constraints of working within an existing structure.

The test methodology and preparation requirements are the same. However, older buildings can present additional flanking risks from continuous structural elements, so it's worth discussing the specific construction with us before the test day.

Sound Insulation Testingin Gloucestershire