Considering hacking the floor? Do remember to do waterproofing. VERY IMPORTANT! You will face leakage problem after sometimes. This is very common nowadays. Contractors did not do a good waterproofing job and that's the start of your nightmare! Take care!
Usually ID accommodate the FSM one lah. Client orientated lah. No Worries. Best both together so the ID can mark the places and cautious about their design. (My own opinion only hor)
Have you found anyone to do up your place? You may email your requirements and layou plan tp jefsmart@singnet.com.sg Nice guy. May be able to help you.