In the case of sound insulation, the solution would be to mandate sound insulation (STC) and ceiling/floor insulation (IIC) testing as a condition of obtaining

In the case of sound insulation, the solution would be to mandate sound insulation (STC) and ceiling/floor insulation (IIC) testing as a condition of obtaining the occupancy permit. Such testing is performed on HUD-financed housing and for housing where state and/or Federal authorities are kicking in funds to mitigate noise from a capital project (typically an airport, highway or rail project). For private developments, it's typically not done unless the developer thinks the architect or contractor screwed up and wants to cover his ass in the event of a lawsuit down the line.