Hi Susan Are you sure your ID can complate A total renovation for your 5room resale flat???? My 5 room unit also need 5 and a half week to hand over . Please Keep us posted If your ID really can hand over to you by 3 weeks and the carpentry installation can be in time . As for the HDB renovation licecnce my advice to you is engage the company who is licecnce by HDB in case anything happen but not third party .