Hi Cuteone,
There is a lot of good renovation contractors at YS One, 1 Yishun Street 23, almost every floor are the factories of contractor. But don't go to the wrond one in #05-46 which is run by Singapore Most Contractor Couple. U will cry. They sometimes call themselves De Palmco Pte Ltd or Palmco Services. You can read more about them at www.aaronseahkngeng.blogspot.com