Is there any formal standard or by-law the developer has to follow or replace/fix? my sister has a new condo recently VP and found out that 50% of the tiles are hollow (as in whole house) and a lot of scratches at the window frame due to workers scrub off the paint.

The problem is that, not 100% (in 1 piece of tiles) is hollow, maybe some at the corner and some tiles are scratch (but only visible when strong light).

So, i mean, is there any write out by govt agency that i can use to talk to the developer? Currently they only agree to change certain thing only.

Please help.