My sister went to one ID contractor at Yishun HDB shop, their attitude was good when serving you..but on the day of installation, not punctual at all..and they can tell you it's on their way...and my sister booked the appointment at 11am..guess what, they never turn up around 4pm..so my sister call the lady in charge again, and she told her the same excuses again and again...they're on their way..my sister replied:"forget the deal'! HDB Contractor..phobia..