“Very proactive and extremely helpful, especially with technical queries. I would not hesitate to recommend and will certainly be using them again in the future.”



Under CDM2015 regs we have found CASS ALLEN to exercise a level of professionalism and due diligence which is second to none. We would therefore definitely recommend CASS ALLEN as our preferred acoustic consultant, for all of our projects.’


SF - Taylor Wimpey South Thames

“I was very pleased with their technical knowledge and professional approach when dealing with a very awkward purchaser as well as the local authority.”


JH, Telford Homes

“Cass Allen went above and beyond to help with the Acoustic planning performance and conditions regarding the Greenwich Creekside project…”


LM, Capita plc

“Good comprehensive reports and advice at all design stages. Very flexible and professional, provided attendance at acoustic cladding tests at short notice.”


DF, Berkeley Homes

“Cass Allen have assisted us on a number of our projects. I’ve been impressed with their thorough and professional approach.”


MT, Lark Energy

Sound Insulation – Design and Testing

Part E of the Building Regulations requires that new dwellings and schools are constructed to achieve certain acoustic standards. Cass Allen are experienced in the detailed acoustic design required to comply with, or exceed, Part E standards.

We are also accredited through the Association of Noise Consultants (ANC) to carry out Pre-completion Sound Testing to demonstrate compliance with Part E. We have carried out several thousand of these tests, which have given us a wealth of data on the in-situ performance of most types of building constructions. This enables us to be confident in our designs without needing to ‘over-engineer’ constructions, often saving clients substantial sums.

As part of our services relating to Part E compliance, we provide free training seminars at either our Bedfordshire Head Office or clients’ offices, depending upon delegate numbers. Please contact us for further details.

Apartment Block – First Phase of Ruskin Square Development

Client: Midgard Ltd
Architects: Allford Hall Monaghan Morris

Scope: Cass Allen Associates has been instructed by Midgard Ltd to assess the acoustic design of this apartment block, which rises from 9 to 20-storeys and is part of the first phase of the £500m development at Ruskin Square in Croydon.

An Environmental Impact Assessment showed that noise levels at the site are dictated by the adjacent East Croydon railway line and traffic on surrounding roads. We are currently advising on the acoustic design of the external envelope of the building before moving on to address the internal acoustics of Phase 1.

New Build Replica – Tottenham

Client: Allenbuild Ltd (South East)
Architects: Rolfe Judd

Scope: This original Art Deco 1930’s listed building was destroyed in the London Riots of 2011 and has been replicated with a 4-storey mixed use building containing 26 flats with retail space at ground and basement levels.

Cass Allen Associates were appointed to carry out sound insulation testing for this new build development to demonstrate that the acoustic performance of the separating partitions satisfied stringent Building Regulations Part E and Code for Sustainable Homes requirements.

Care Homes – Kent PFI Project

Client: United House
Architects: Calford Seaden
Planning Consultants: Calford Seaden

Scope: To carry out pre-completion testing to demonstrate compliance with parts E and L1A in this series of care homes built as part of the ‘Better Homes Active Lives’ PFI project for Kent County Council. The photographs show the Morgan Stanley and Hopkins Field care homes.

Kew Bridge West Development

Client: St James
Architects: Stockwool

Scope: St James, part of the Berkeley Group, have instructed Cass Allen Associates to provide detailed acoustic design advice through the design and construction stages of this exciting new development.

The development is located on Kew Bridge Road, in Brentford, opposite the River Thames. It will consist of three residential blocks housing 1, 2 & 3 bedroom apartments and underground parking.

Urban Regeneration in Digbeth

Client: Colmore Tang Construction
Architects: BDG

Scope: Colmore Tang Construction has instructed Cass Allen Associates as acoustic consultants to discharge noise related planning conditions, provide building acoustics advice and pre-completion testing for the redevelopment of the former Harrison Drape curtain factory in Digbeth.

The two acre site is being redeveloped into a residential-led mixed-use complex and will comprise 313 apartments and a 2,240 sq ft retail unit with associated infrastructure, parking and landscaping.

The original façade of the former Harrison Drape building will be retained and extended as part of the refurbishment and three new buildings will also be erected.

Comet Square, Phases 1 & 2, Hatfield

Client: Barratt Homes
Developers: Frontier Estates & Thistle Land
Architects: Powell Dobson
Planning Consultants: Rapleys

Scope: This £90m scheme covered 16 acres and comprised approximately 4,000 sqm of retail and leisure space including a 120 bed hotel, 467 new homes, a nursing home, a new bus interchange, restaurants and retail premises. We were appointed to carry out acoustic design in line with planning conditions and Part E of the Building Regulations. Following construction, we carried out sound and air testing throughout the development to demonstrate that all plots achieved Building Regulation requirements.

New Secondary School – Merchant’s Academy, Bristol

Client: Cowlin Construction
Architects: AWW
M&E Consultants: Mitie

Scope: To acoustically design this new £23m academy to comply with Part E of the Building Regulations and Building Bulletin 93. We then carried out Pre completion tests, which showed that all design targets had been achieved.

Conversion of listed building into luxury apartments – Bushy

Client: Comer Homes Group
Architects: Architects Design Partnership

Scope: To provide design advice and pre-completion acoustic testing to this conversion of the former Masonic School for Boys into luxury apartments.

This is one of many conversions of listed buildings that Cass Allen have advised on. Often, refurbishments are acoustically more complex than new-build developments due to working within the constraints of the existing building fabric, and the lack of repeating details throughout the development. In this conversion, no two apartments are the same.

New Mixed Use Development – London

Client: Barratt Homes North London
Architects: Hester Architects
Planning Consultants: Bell Cornwell

Scope: To carry out an environmental noise assessment and Part E design study on a new 180 dwelling mixed use development close to a railway line on a former factory site in North London. The lower picture shows part of the acoustic modelling superimposed upon satellite imagery used to predict the noise level on the various facades of the development. Pre-completion tests demonstrated that the acoustic design was successful.

Get in touch

We hope you’ve enjoyed browsing our website but if you have any questions feel free to call us to talk through any acoustic issues you may be facing on your projects. The best person who can help with specific queries can be found here.