additions alterations angled angles building building-construction building-site building-work construction construction-site construction-work danger development height high industrial metal-work patterned patterns pipes reinforced reinforcing safe safety scaffolding secure security steel steel-scaffolding tall work architecture building work construction work dust protection facade metal work railing rails safety mesh scaffold steel scaffolding white mesh buildings external heights lifts protected protection work-safe workmen construction helmet sacfety line safety harness safety helmet welder welders welding crane greyscale building construction construction sites cranes ladders carpark multi-storey multi-storey carpark bricks brickwork builders-lift construction-lift home house ladder lift second-storey second-story suburban two-storey two-story urban wall walls