Hey just wanna share on point 1).
I just overlay both bathroom about 1.7m width by 3m length. ID quoted about $900 for that job, however I semi-DIY them at half price! Mine is a new BTO FLAT, hate the flooring so i overlay them - cheaper than hacking as new flats cant touch the flooring for 3 yrs.
1) Bought Floor tiles + 2 x 50 kg cement = approximately $250/- (at HAFARY located @ Defu Lane, still got 10% discount)
2) Employ freelance worker @ $100 per day ( 8 - 5) , took 2 days to settle!