Established in 1974 as an multidisciplinary practice of Architects , Chartered Building Surveyors  and Project Managers, Hadley Design Associates initially specialised in their key strengths of private residential new build & Local Authority & Housing Association refurbishment projects . The practice expanded and diversified thereafter and was appointed by many Local Authorities, Housing, Education & Corporate Services Departments together with a variety of clients such as Post Office, British Gas, NatWest, Barratt Homes and  many other developers & individual private clients.

HDA have designed , specified and supervised many thousands of architectural & building surveying projects in differing spheres together with managing the roles of the other professional building disciplines. Individual building contract sums have ranged from £10k to £20m with total building project values administered now running into £billions