residential extension | corner opening | flat roof overhang detail with spot lights | inside outside. gallery of bi-folding doors, sliding doors \u0026 skylights. marley folding concertina door with full height glazing. interior iding doors image collections glass door interior oak bifold doors interior choice image glass door. extension with bi-folding doors and sky light. full size of cozy tile flooring with mid century dining chairs and lana doors for modern . anthracite grey bifold doors.