In summary, to buy a pte condo a buyer is required to pay 5% cash, 15% cpf (if cpf not enough, then from cash), 3% x transacted $ -$5400 as stamp fee, abt $2500-$3000 legal fee a
and mortgage/ caveat fee for transfer (usually bank subsidizes 0.4% of loan or $2500 whichever is lower).
Do note in terms of booking fee in upfront cash when booking for a new and uncompleted condo is 5% followed by 15%(from cpf or cash or both if insufficient cpf) in 8 weeks from OTP date; while booking a resale pte condo is 1% cash upfront when booking for option to purchase followed by 4% cash in 2 weeks during exercising the option. All stamp fee is paid when you exercise the option.
Hope the above summary is made simpler to be understood.
Feel free to call me at 98765130 to extend my 1-stop service from helping you purchase a condo to obtaining a bank loan and legal advice services to make the transaction a smooth one.