Office fit out in London

We are proud of our heritage in the London office fit out sector, and we are recognised by the industry as leaders in this highly competitive marketplace.

We believe the office environment should be as smart and dynamic as today’s most competitive organisations. After decades working alongside developers, designers and end users to build, fit out and refurbish new office buildings and workplaces, we have an unrivalled portfolio and depth of expertise. More than that, we have made it our business to know your business. Our distinctive and robust offices offer responds directly to you, our customer.

ISG named number one London office fit out contractor for fifth consecutive year

ISG has been named as the number one central London corporate office interior fit out contractor for the fifth consecutive year. A report confirms that ISG’s dominant share of the Cat B office fit outs in the capital since 2012 is 33 per cent amongst the top 10 firms – totalling over 5 million sq ft of space.

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Did you know ISG has the skills and experience to meet all of your office property needs? We might be known for our unrivalled portfolio of large fit out projects in London, but we have the track record, global presence and specialised expertise to do so much more to support your business.

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Introducing ISG’s delivery dynamic

Our dynamic delivery got us where we are today. But it’s not all we are. What we aspire to at ISG is something far more than the end product.

Watch our video to learn about our unique delivery dynamic.

Our core services

ISG is different. Our origins in fit out means we have meticulous attention to detail and focus on the client’s needs and business drivers like no other, and we know that every project is a technology project. Which is why we acknowledge our service offer is equally about fit out, technology and construction.

Fit out

Our track record reveals broader experience across a wider range of projects than any other provider in the market.


Our dedicated technology solutions team capable of advising and implementing for our clients across all sectors.


We have a strong track record of construction and engineering projects, from single-storey construction to large-scale.


  • Mark Valios
  • Pre-Construction Director, UK Fit Out