Cleaning in Sembawang is shaped by buildings. Most homes are HDB flats, with newer precincts around Canberra, and much of the work is tied to a date: a move-in, a tenancy handover, the big clean before Chinese New Year, a reclean after renovation.
Commercial work sits in shop units around Sembawang Central, small offices near Canberra and Admiralty, and industrial space in Gambas. Each of these has different access rules, hours and supervision, so your offer should say what you can do and when.
Directories and island-wide maid platforms compete on price. A local page that names the estate and the access window competes on fit. Your crews should hold whatever licences their category needs. Prices are in S$, with GST at 9% stated in quotes.