residential-housing Free Quote Sound Insulation Testing | Air Tightness Testing
SAP Calculations & EPCs | Overheating Calculations | SBEM Calculations
Noise Assessments/Surveys | Energy Statements | Water Efficiency Calculations
Ventilation Testing & Commissioning | Energy Saving & Reducing Carbon Emissions
Building Regulations
Compliance Services

About us

Formed in 2010, JosTec (formerly RJ Acoustics) are experts in numerous Building Regulations Compliance Services. We offer sound insulation testing for Building Regulations Part E, air tightness tests, SAP calculations, SBEM calculations and EPCs for Building Regulations Part L1, ventilation testing and commissioning for Building Regulations Part F, water efficiency calculations for Building Regulations Part G, and all types of noise assessments and surveys.
We also offer consultation services, giving you the best chance of passing your testing first time.

Our aim is that you never need to look further than JosTec for all of your building compliance needs.

We cover all parts of England and Wales and are fully accredited/qualified in all our fields.



Years of Experience


Small, growing team


Satisfied Customers


"Thanks so much for getting everything over to me so quickly. I just wanted to express my thanks for your attitude and professionalism. We’ve had struggles with other testing companies in the past, but your efficiency and knowledge is really refreshing. We won’t look anywhere else for sound, air and ventilation testing in the future."
Jonathan Ellis
, Hamilton Court Developments, MD
"JosTec have been very professional and helpful in the air permeability and sound insulation testing for the 179 plots I have just completed. They have been very obliging in advising on the best way to achieve the results we required for this site. With fast issue of certification when required, I would certainly use and recommend JosTec for future work. Pleasure to work with."
Dean Chinsky
, Taylor Wimpey, Site Manager
"I have been dealing with JosTec for about 4 years, a really good firm who actually carried out what they promise. Always good to take advice from them from the outset, so that when you come to your final results there won’t be any surprises. A dynamic firm which really satisfied the needs of the building industry, very resourceful and informative and good value, friendly and easy to get on with, and who will go the extra mile for you. I have used them on all my sites."
Neville Nash
, Zibcrest Homes, Director

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