“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

About Us

A Service Company

We aim to be at the forefront of acoustics consultancy firms, with a strong sense of commitment to our clients and their projects.

We are a medium-sized independent consultancy that is large enough to handle the most complex projects, yet small enough to respond flexibly to client needs and allows our clients the reassurance of knowing the consultants working on their projects.

We work in a wide variety of sectors but are primarily known for our work related to the planning process, construction, utilities and entertainment industries. We work throughout the UK and occasionally further afield – a map showing the location of completed projects can be seen below.


The seeds of the company were sown in 1992 when Patrick Allen, who was then Head of Architectural Acoustics at a leading UK consultancy, started an audio production company. We have expanded our areas of expertise over the years, but are still, we believe, unique in providing professional audio production facilities in addition to the more usual acoustic services.

Our people

Our consultants are qualified to at least first degree level in acoustics-related subjects, and are members of the relevant professional institutes for their specialist areas. We back up technical knowledge with practical experience and a pragmatic outlook on solving real-world acoustic problems. We are supported by state of the art instrumentation and computer modelling facilities.


We believe we are the right team to ensure the success of your project and offer the following 6-point guarantee:

1. We will respond to you quickly

We understand that responsiveness is a key attribute of specialist consultants. We have processes in place to ensure all queries are answered promptly and helpfully.

2. Our advice will be clear and concise

We specifically seek out and employ approachable, proactive and friendly staff with excellent communication skills. We will communicate solutions and advice clearly and effectively with minimum jargon.

3. We will be pragmatic

We always adopt a pragmatic approach to any project and will provide advice in the best interest of our clients to provide the most cost-effective solutions.

4. We will be honest and true to our word

If we say we will achieve a deadline then we will. We will not over promise and will always deliver. We will help you confront problems upfront and work closely with you to find the solutions.

5. We will provide best value for money

Our internal systems and processes are geared around efficiency. Our experience allows us to proactively spot problems early to help you minimise delays and unforeseen costs. On previous projects we have saved our fees many times through value engineering.

6. You will be satisfied with our work

We ask all clients for feedback and to rate our service out of 5. Our current average Client rating is 4.85 out of 5. Please visit https://www.cassallen.co.uk/testimonials to review detailed feedback we have received from our clients.

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.