✔ 最佳答案
For Electricity - You can apply via web site or you can phone to CLP ( for Kowloon ) or HKLamp ( for HK ), around 1 week before is fine.
For Gas - You can apply via web site or go tp their outlet to apply. Around 1 week.
For water supply - You can apply via web site or submit the form to Water Department, better apply 2 - 3 week before handover.
Remember to submit your ID card copy & the Agreement.