A portable adaptable enclosure for providing environmental control and containment of contaminants for a variety of onsite applications. The enclosure utilizes a limited number of tubular construction elements that are interlinked together to form an integrated expandable use enclosure defined by extending interengaging vertical and horizontal tubular elements in a terrain adaptable extensible structure. Telescopically adjust support elements with interengaging multi-directional attachment fittings allow for successive erection and extension in linear and off access orientation in a sequential step fashion to follow work defined directional requirements in the field.