John Doyle Group was a British civil engineering contractor, specialising in substructure, superstructure, basements and infrastructure works. The company was founded in 1966, and based in Welwyn Garden City, with other offices based in Warrington and Derby. Civil engineer Stef Stefanou joined the company early on, and over time became its owner and chairman. The John Doyle Group had several companies underneath it. Including John Doyle Construction, Blythewood Plant hire, Bell Projects, and Ibex Interiors. Ibex Interiors was a fit-out and refurbishment contractor based in London.