You are welcome with your UAV in Singapore.
Maximum take-off weight: No limit
Maximum hight: 120 meters / 393 ft.
Maximum horizontal distance: Keep visual contact with UAV
Minimum age: -
Distance Airports / Heliports: 5 km / 3.18 mi.
Night flights: Prohibited
Prohibited: Not above houses unless you have permission from the owner. Not about military objects, rescue workers.
Useful link: Civil Aviation Authority Singapore (CAAS)
Contact information: CAAS Contact Formulier / +65 65421122