OSI Range of Services

Dilapidations & Repairs

“We understand the need to provide a swift, thorough and cost effective service to owners of commercial property whatever the use of the buildings ie residential, office, retail or industrial. We are able to assist property owners and their surveyors with in house expertise on design, cost budgets and projected time frames in whatever discipline might be required including Mechanical, Electrical and Structural aspects.”

Construction and Fit Out

“We are experienced in all aspects of commercial and high end residential construction and fit out and can offer clients a service tailored to the needs of the project. A supply chain of trusted specialist companies in such diverse disciplines as blast resistant windows through to bespoke soft furnishings gives us the strength in depth that you can rely on. In addition our ability to work in occupied areas whilst focusing on the minimum disruption to our client and their neighbours give you the peace of mind to engage us on your project”


“Confined sites, security restrictions, occupied buildings, heritage aspects, demanding timescales…….these are just some of the issues that constantly come up when trying to execute a successful refurbishment. We have consistently risen to these challenges and exceeded our client’s expectations in terms of time, quality and cost. Projects are often caught between demands on other aspects such as energy performance and planning restrictions in an increasingly legislative environment but, be assured, OSI can offer reliability in the delivery of even the most complex of projects.”

Mechanical & Electrical

“Understanding the importance of building services and effectively integrating their design and installation into the overall project is at the heart of OSi’s philosophy and approach to a project. Coming from a background of fitting out complex computer suites in the 80’s and 90’s we have a depth of experience in house of projects that are more services orientated and fully understand the need for these installations to be completed highest standards. Energy performance, sustainability and environmental concerns have taken centre stage in recent years and the balancing of these issues with climate control, power and communications systems and safe and healthy working plays a vital part on all our projects.”


Underpinning our approach to all projects is our constant strive for improvement. This is why we take seriously the accreditations we have gained to date and are always looking to improve and add to these where possible. OSi hold current ISO9001 and ISO14001 certification and are also Constructionline accredited as well as being a member of SAFE Contractor”.