Architectural & Environmental Consultants Acoustics | Air Quality | Overheating

Architectural & Environmental Consultants Acoustics | Air Quality | Overheating

Architectural & Environmental Consultants Acoustics | Air Quality | Overheating

Cass Allen is a specialist environmental consultancy focused on the development, construction and infrastructure industries.

We are unique in that we provide a set of guarantees ensuring all our clients always receive responsive, clear and pragmatic guidance and solutions. These guarantees have led to us delivering well over 3000 successful projects working alongside many of the UK’s leading developers, contractors and architects. Using that experience we support our clients in taking their projects from the early planning stage through detailed design and construction to testing and handover.

Our Services

Noise in the Planning Process

We have extensive experience in assisting clients with outline and full applications, Environmental Impact Assessments and discharging planning conditions.

Room Reverberation Design

The acoustic design of rooms can play a crucial part in determining the operational effectiveness of spaces such as schools, offices and theatres.

Sound Insulation Design & Testing

We are experienced in the detailed acoustic design required to comply with, or exceed, Part E standards.

Air Quality & Odour

Our Air Quality and Odour division is focused on providing pragmatic and helpful advice during the planning, design and construction phases of your development.


We will assist and guide you through compliance with the new Part O building regulations and any other overheating requirements.

Construction Noise, Vibration & Dust Monitoring

We provide noise, vibration and dust monitoring solutions for large-scale construction sites.

Latest News

Company News
29 Feb 2024

Cass Allen share knowledge at guest lectures

Cass Allen share knowledge at guest lectures. We had the pleasure of visiting the University of Derby and Birmingham City University...

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Company News
21 Feb 2024

Proudly Introducing…

We are delighted to introduce and welcome our newest team members...

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Project News
19 Apr 2023

Part of The Battersea Masterplan

We are proud to be assisting with numerous phases of the very exciting and dynamic developments at Battersea Power Station.

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Company News
05 Jun 2023

Our Air Quality division is expanding!

We are delighted to have to added Air Quality to our array of expertise and celebrate a successful 6 months.

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Project News
28 Feb 2023

Protecting some very important artefacts

We have recently completed an exciting project based at The British Museum.

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Project News
19 Jan 2023

Acoustic design for the city’s hottest new hotel

New London Hotel The BoTree has announced it will launch in July 2023. We are really excited to be involved in the detailed acoustic design of this unique hotel.

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Company News
25 Oct 2022

A warm welcome to air quality and odour expert Paul!

We are delighted to announce the appointment of Paul Hayward as Principal Air Quality Consultant.

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Project News
29 Jun 2022

Oxted Rises!

Cass Allen carried out the detailed acoustic design and testing of this beautiful new development in leafy Oxted for St William Homes.

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Project News
27 Jan 2022

Luxury London living at the iconic Regents Crescent

We are proud to share news of our involvement in the development of Regents Crescent, a sweeping Grade I listed building, originally designed by John Nash, in the heart of London.

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Company News
05 Nov 2021

We’re off to the OxCam Arc Conference!

We are excited to share news of our involvement in the OxCam Arc Economic Growth and Development Conference taking place at Stadium MK on 16th and 17th November 2021.

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Project News
19 Aug 2021

The sky’s the limit at Consort Place

Working with Midgard Ltd as part of their design team, we are proud to share news of our involvement in Consort Place (formerly known as Alpha Square), a landmark development on the Isle of Dogs, London, owned by the Hong Kong developer Far East Consortium (FEC).

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Project News
02 Jul 2021

Driving down noise levels at Vauxhall Way

Luton Borough Council recently appointed our team to assess noise levels related to the phased dualling of Vauxhall Way.

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Project News
05 May 2021

Gull Wing project takes off

We’re delighted to have been appointed by Farrans Construction to assist with the preparation of a Section 61 Assessment for the Gull Wing project, Lowestoft.

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Project News
01 Jul 2020

Construction Continues at Copley Close

We are proud to be working on Phase 6 of Ealing Council’s major transformation of Copley Close.

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Company News
17 Apr 2020

Cass Allen – saying goodbye to the teenage years!

Tomorrow we turn 20! Whilst we are unable to celebrate with a couple of drinks at our local at present we will be celebrating reaching this milestone from our own homes.

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Project News
08 Apr 2020

Hanwood Park progress

Cass Allen are pleased to announce their appointment by Hanwood Park LLP to assist with the discharge of two noise planning conditions relating to the development in Kettering.

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Knowledge Hub

Noise and Planning: Top Tips for Securing Planning Approvals

How noise fits into the planning/ site acquisition process and how to minimise the risk of refused planning applications.

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The Acoustics of Facades

Efficient and cost effective construction methods and tips to ensure Building Regulations Part E compliance and maximise the flexibility of your sites.

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Are Building Regulations Good Enough?

Efficient and cost effective construction methods and tips to ensure Building Regulations Part E compliance and maximise the flexibility of your sites.

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What our Clients Say...

“We have worked with Cass Allen on numerous projects and they consistently deliver a prompt, quality service that provides value for money. They are pro-active in their approach and are always happy to engage with the right people at Local Authorities in order to properly advise us”

Neil Farnsworth, Head of Planning, Cala Homes

“Architectus have worked with Cass Allen for over 20 years, they have always been proactive, supportive and provided fast, practical, buildable and cost effective solutions. We cannot recommend them highly enough and hope we will be working with them for the next 20 years!”

Jez Rippon, Director, Architectus

“Cass Allen have worked on almost every Telford Homes scheme. The repeat business and continued relationship thrives on the service we receive, day in day out. They work very closely with us to provide a solution that works for us. They’re a proven asset to our business.”

Daryl Diggons, Senior Technical Coordinator, Telford Homes plc

“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.”

Antony Plumbridge

“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.”

Stephen Farr, Technical Manager, Taylor Wimpey South Thames

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

Liam McGuigan, Project Manager, Capita plc

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

David Farrell, Senior Technical Manager, Berkeley Homes (South East London)

“I have worked with Cass Allen on a few different scale projects. They have always been very accommodating and helpful. Chris will always go the extra mile to ensure we receive information when required even with tight time-frame. They are a pleasure to work with and I look forward to any future projects.”

Phoebe Evans-Khan, Trainee Technical Coordinator, Hill

“Cass Allen have provided an effective and co-operative approach throughout the duration of the project with advice upon all acoustic matters inclusive of the requirements for Planning, BREEAM, Code for Sustainable homes and acoustic testing. The staff at Cass Allen were always prompt in their response to questions relating to all types of acoustic matters”

Graham CANN, Design Manager, London South East, Bouygues

“I have dealt with 4-5 different members of Cass Allen. I find them all to be very helpful, proactive and very practical. I also found them very willing to engage with Planners to agree a more practical approach than had been agreed by a previous Acoustician working on our behalf.”

Ricky Allgood, Technical Manager, Berkeley Homes (South East London) Ltd

“Competent, smart and flexible, that’s how I would describe CA business model against the needs of a competitive main contractor as Midgard. Over the past few years we have been delivering with Cass Allen, working together as a team, several high end projects and their contribution has always being proven as essential”

Emanuele Calabro, Pre-Construction Design Director, Midgard

“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 has worked on a number of commissions for Taylor Wimpey. Commercially focused, Cass Allen consistently provides a professional and pro-active service which is very much aligned to finding and providing the right solution for the client.”

David Rowland, Technical Manager, Taylor Wimpey South Thames

“Cass Allen are extremely proactive in their approach, always timely and provide their expertise in a very user-friendly manner. They are exceptionally cost aware and always endeavour to provide cost effective solutions. They are a pleasure to work with and an invaluable member of the design team.”

Luke Cronin, Technical Manager, Willmott Dixon

“A thorough and efficient service, very easy to work with and crucially very proactive in finding solutions. The site was positioned over Network Rail & HS1 assets so was particularly sensitive from a noise and vibration perspective and Cass Allen’s work here has proved invaluable.”

RJ, Senior Technical Co-Ordinator, Telford Homes

Send us a message or call on 01234 834 862

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