What hidden construction issues should investors look for?

Budget finalised, loan pre-approved — now stuck on which sector to invest in for a 3BHK upgrade. I'm eyeing projects like Sattva Lake Ridge, but long-term construction quality ki tension hai. How do we spot potential issues like seepage ya bad fittings *before* possession? Builder brochures toh reality post 1-2 years show nahi karte. Also, water supply reliability tenants ke liye bohot key hai, right? Tanker dependency can be a deal-breaker. What are your tips for checking these hidden costs upfront? Hope this helps someone else too.