Dennis Johns Service Group

Dennis Johns Service Group is an established Electrical & Security services contractor carrying out PPM and project works in London and surrounding areas.  Based in East London and we have been supplying Electrical & Security services to a wide range of clients, for over 50 years. We have grown from a small family run company to an established highly respected SME. Our client base ranges from blue chip companies such as a premier league football club to government institutions including educational facilities, schools, NHS hospitals, research buildings and local authorities across London and the south east.