make sure all windows and skylights are designed and constructed so that they may be cleaned safely (you may also need to fit anchor points if window cleaners have to use harnesses).
make sure any windows capable of being opened can be opened, closed or adjusted safely.
make sure floors, corridors and stairs etc are free of obstructions, eg trailing cables.
have enough space for safe movement and access.
fence or cover floor openings, eg vehicle examination pits, when not in use.
take precautions to prevent people or materials falling from open edges, eg fencing or guard rails.
put right any dangerous defects immediately, or take steps to protect anyone at risk.
maintain the workplace and any equipment so that it is safe and works efficiently.