The official OG1 declaratory defines the category as covering the construction, maintenance, and renovation of buildings designed for human activities, complete with structural components, electrical/technological systems, and all types of finishes. In practice, OG1 includes all standard building works such as homes, offices, schools, hospitals, factories, stations, multi‑storey car parks, and similar structures, along with all connected and accessory works.
Declaratory (official wording):
This category concerns the construction, maintenance, or renovation of building works required to support any direct or indirect human activity, complete with structural components, electromechanical, electrical, telephone, and electronic systems, and all types of finishes, as well as any connected, complementary, or accessory works. It includes, by way of example, residential buildings, prisons, schools, barracks, offices, theatres, stadiums, industrial buildings, parking structures, railway and metro stations, airport buildings, and any specialized reinforced‑concrete structures—whether ordinary or pre‑stressed—cast in place, such as thin vaults, domes, elevated tanks, silos, and tall buildings with complex structural characteristics.
