kangeroo168

actually, any contractors also can do. but because ur jobs is minor, be prepared to be charged at a bit higher price. i would suggest u try to lump more jobs together, and 1 shot do all. it will be cheaper.

ok. civil PE is normally known as PE, or, just engineer. if u want to hack some walls (i'm talking about HDB, cos i knocked my house walls before), and perhaps that wall is, per casted, or load bearing (forgot what is the exact terms HDB gave last time), u will need to engage a PE to see whether this wall is fit for knocking. then the PE will evaluate whether this wall can be knocked or not. if the wall can be knocked, the PE u engaged will give them (HDB) a letter or some sort of certification that the particular wall can be knock. thats all.. if u want cheap PE, just pm me. i engaged a PE for less than 500 dollars. however, this is for HDB. if urs is condo, then u may have to negotiate yourself. hope that helps..

Yes u need approval from management. Maybe u even need civil PE to endorse. Actually i couldnt make out ur drawing.lol.. And time? It depends on how u push ur workers..

Hack will be better. Although more ex, it saves u time and money should the old water proof burst. Then u need to rehack ur overlay and old tiles