“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

Rainfall noise putting a damper on your day?

Noise from rain is often overlooked in the design of new buildings however it can significantly impact the final use. Lightweight or glass roof constructions can lead to high internal noise levels during periods of heavy rain which in turn can lead to disturbed sleep, interruption in concentration or difficulty in communicating.

Some national guidance exists regarding acceptable rainfall noise levels for healthcare and educational developments. However, there is no guidance for rainfall noise affecting residential and commercial developments despite the potential to significantly impact on the occupants’ amenity.

Click below to view our simple table that can be used to assess the risk of rainfall noise affecting the quality of your project.

It can be seen from the table that some constructions represent a high risk of adverse rain noise impact. In these cases we would recommend that an acoustic design assessment is carried out. Generally speaking, remedial measures for these constructions may include:

  • Increasing the mass of the layers or glazing panes
  • Adding additional separation and/ or fibrous insulation into the construction
  • Adding a resilient materials to the upper layers (e.g. grass, gravel or specialist products)

Every case is different however so if you have any concerns about rainfall noise for one of your sites please get in touch with us.


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.