Cleaning in Serangoon runs on handovers and access. Flats around Serangoon Central turn over when tenants leave, and landlords want a pass on inspection before keys change hands.
Kovan's condos add management offices that set rules on lift bookings and working hours, so a crew should know them before quoting. Renovation cleaning follows the contractors, especially in older HDB blocks being refreshed.
Serangoon North changes the picture again, with shop units and a light-industrial estate where the buyer is a manager and the job is a contract, not a one-off. Nex and the shops near Serangoon Central bring office and retail demand of their own.
A crew that can do a 9am reclean in Kovan may still be unable to reach Lorong Chuan the same afternoon, so coverage has to reflect the roster.