Orostream has built a reputation over more than 40 years for delivering high quality projects having originally being founded in 1982 and established to meet the infrastructure demands of specialised mainframe computer environments. This background required a multi-disciplined approach – integrating power, security, climate control as well as complex building infrastructure and communication systems expertly into projects with speed, precision and reliability.

Today, we bring that same integrated, ‘one-stop-shop’ mindset to every project we undertake. From secure environment construction to bespoke refurbishments and fit-outs, we combine general construction expertise with in-depth building services knowledge to deliver high-quality results seamlessly.

Working across the UK and internationally, every project is overseen by a Director with full decision making authority who is supported by dedicated project management and logistics teams with the appropriate levels of security clearance – ensuring accountability, confidentiality, agility and a consistently high standard of delivery every time.

We remain fully committed to providing a first class service where time, quality, and client satisfaction are always the priority.

At OSi, health and safety are at the core of everything we do. Whether delivering secure environment construction, bespoke fit-outs or complex refurbishments, we are committed to safeguarding the wellbeing of our people, our clients and the communities in which we operate. We work tirelessly to maintain a culture of safety, responsibility and continuous improvement across all our sites both in the UK and overseas.

Our Approach

We follow rigorous procedures and strive to maintain the highest standards of health and safety compliance across every project. Our approach includes:

• Full compliance with all relevant health and safety legislation (including CDM 2015 in the UK)
• Comprehensive Risk Assessments and Method Statements (RAMS) prior to all works
• Mandatory PPE for all site personnel
• Regular Toolbox Talks and site inductions
• Robust incident reporting and investigation procedures
• Continuous improvement through performance reviews and learning from near-misses
• Training and education for our workforce including SMSTS, SSSTS, First Aid and other qualifications
• Seeking external specialist support and advice whenever necessary in the preparation of our site safety documentation and methodology.

Certifications & Accreditations

We are proud to be accredited by leading health and safety bodies, ensuring our practices are externally verified and continuously updated. Our accreditations include:

• SafeContractor
• SIPP
• Constructionline

Building a Culture of Safety

We’re often faced with unique challenges on our overseas sites and none more so than when implementing robust health and safety measures and imparting these to any locally engaged tradesmen and site operatives who may not be used to working to the same standards. However, with patience and pragmatism we ensure that our sites match or exceed those goals through being flexible and adaptable whilst maintaining our focus on providing the safest possible working environment. In addition, our people-first culture means every voice matters. We actively encourage all employees and partners to speak up about potential hazards and contribute to safer, more responsive workplaces.  We strive for a “zero harm” environment, where safety is not just a requirement, but a shared responsibility and value.

Protecting the Planet

At OSi, we believe great construction shouldn’t cost the earth!

Sustainability is embedded in everything we do – from reducing waste and emissions on-site to sourcing responsible materials and prioritising long-life, low-impact solutions.

As a certified ISO 14001 Environmental Management company, we ensure every project is delivered with environmental care, compliance and with a view to continuous improvement.

We are proudly committed to achieving net zero carbon emissions by 2050 in line with national and international climate targets. Through smarter design, cleaner delivery and continuous innovation we are achieving our goals, reducing our footprint and helping clients do the same.

We’re focused on the future – combining smart, sustainable building practices with a commitment to quality. Whether we’re updating existing spaces or creating secure new environments, we’re dedicated to delivering solutions that truly benefit our clients, communities, and the generations ahead.

Supporting People

We believe every project, wherever we are working in the world, is an opportunity to make a positive difference. By supporting local employment, providing skills training, and mentoring future talent, we help communities grow and thrive. Our commitment to sustainable practices ensures that projects leave a lasting environmental and social legacy. Working closely with clients and stakeholders, we deliver outcomes that benefit people, places, and communities long after the project is complete.