Hi guys,  
Will need fellow forummers advise on how much I need to budget for my reno. 
I have just bought a resale 4-room 4A flat - 105sqm. 
Am planning to do a full reno for the place. Some considerations include: 
1. Replacing all the 4 doors. The doors are "n" shaped, and I want to get regular rectangle shaped doors.  
2. Does hacking costs a lot? I plan to have parquet floorings in all the bedrooms. Would I need to hack all the tiles, or would the contractors be able to only hack the bedrooms? Or it just makes more sense/economical to hack everything? 
3. Redo both toilets and make it modern. 
4. Kitchen, to hack away the current cabinets/ sinks, and redo new ones. 
May I know how much should I roughly budget? Give and take 3-5K difference b/w different ID firms? 
Thanks.