M&J Group are one of the largest specialist construction companies in the UK, having developed our extensive knowledge of the flat roofing industry into total building envelope works. Although M&J’s roots are firmly in the roofing industry, our comprehensive list of projects involving complete building envelope works, as well as M&E, internal decorations and associated works is testament to M&Js success and expertise in the general refurbishment industry, working as principal contractor for 95% of our clients.