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D S I (UK) Ltd Data & Security Installations (DSI) is a local business providing complete Data, Telecommunications and Security solutions to homes and commercial centres across the UK, with offices in the South East of England. We are proud to have developed a solid reputation for delivering exemplary service with a friendly and professional approach that sees our customers coming back to us time and time again.

In this age of heightened security for your home and commercial business, we've a realm of standard and effective measures as well as tailor-made solutions to ensure your premises, telecoms, data and more importantly, your people, remain safe and secure.
Services
DSI has been looking after security matters for over 20 years. Located in Ewell, Surrey and serving London and the Home Counties and all over the UK, we have a team of highly professional specialist suppliers and installers of complete computer, telecommunication and security solutions. Our effective and modern intruder alarm systems are fully compliant with all police and insurance requirements.
Securing your computer software, hardware and valuable data is fundamental in today's climate. Statistics have shown that around 50% of businesses / organisations in the UK will be burgled this year alone and of those, 70% are likely to be re-burgled within a few months! The average cost of a computer theft is approximately 25,000 but what cost do you put on the hassle?
Typically working with office fit out and refurbishment companies, DSI designs, installs and supports structured wiring systems of CAT 5e, CAT 6 and Fibre and is approved and accredited with several manufacturers, offering a 15 year warranty. DSI will also carry out tests on existing systems providing a full report and performance analysis, ensuring your data is connected and secure.
For a local company with a focus on customer retention and good business ethics, DSI has built up a credible network of high-profile clients across the UK, including Blue Chip retailers, government institutions and entertainment centres. We offer a comprehensive range of services to ensure your commercial premises, data and IP, and more importantly, your people, are safe and secure.
Reviews (9)
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Paul Parsons
Feb 08, 2022
We have had 2 cctv systems from this firm recently. It's a bit of a shock in this day and age when people do a really neat job and take great pride in what they have just fitted. They also seem incredibly helpful with after sales assistance as well. Cannot recommend this firm enough. 10/10.
Print Copy Sign Ltd
Aug 17, 2021
What a great Company to do business with, from the moment we contacted them through to installation it was so very easy and at a great price, We highly recommend this company.
Bea Campbell
Jun 20, 2021
Wouldn't use anybody else A1 service. Alarms and ongoing maintenance provided for both our commercial offices.
Chris Dyer
May 25, 2021
Have used DSI on various occasions and most recently to install a smoke alarm system. First class service at reasanable prices. I would not go anywhere else. Highly recommended.
Paul Cawthorne
Feb 05, 2021
I have been using DSI's services for the past 30 years and always found their staff to be helpful, knowledgeable and courteous. I can highly recommend DSI (UK) Ltd.
Ian Buckett
Nov 05, 2020
DSI have installed 2 alarm systems for and have done a geat job, after sales service also great.
Trevor Wood
Apr 29, 2018
I have known DSI for a very long time, and can heartily recommend them to anyone needing a good, reliable security company.
Stephen Taylor
Feb 26, 2016
An excellent company to use when requiring work to be carried out on your alarm system. They are professional, friendly and offer a great value service. Their advice is extremely helpful and they will take the time to explain all the options to you. I had my alarm detectors replaced and they then took the extra time to work out all the zones on the system, explain them to me and also explain how to work the alarm panel (as I previously didn't know how to use it). Definitely felt they went the extra mile and would thoroughly recommend them.
Tony H.
Oct 08, 2012
It is sad these days so many newly built offices and older ones need this type of security, but that is the period we live in.