Duro is responsible for providing clients with a complete package which include site and building design, preparation of construction documents, attaining municipal approvals including zoning, site plan approval, minor variance approval, preparation of construction budgets, contract administration during construction including field review and certification of work and preparation of draw certificates for payment. Bicorp Design Group Ltd. [BDG] was founded in 1991 as a full-service consulting firm providing architectural design and engineering services.