2BHK to 3BHK upgrade: How I check site quality

Been looking for 8 months now, eyeing a 3BHK upgrade from my 2BHK in Sector 57. For under-construction projects like Signature Global City 93, don't just see the show flat. A major hack is scrutinizing the *actual* construction blocks. Check material quality, how workers operate, and proper scaffolding. For amenities, never just trust renders. Ask for specific timelines and materials for the clubhouse or green areas. This helps gauge future construction quality and if promised amenities will actually be delivered. Hope this helps someone avoid future headaches!