For most of the last two decades, precast concrete in India was justified on schedule alone. A contractor could point at a launching gantry and promise a faster viaduct. That argument was always true, but it was never the most interesting one.
What has changed is measurement. Once embodied carbon entered client reporting, the controlled conditions of a casting yard became a carbon instrument as much as a productivity instrument. Mix designs can be optimised to the tonne. Waste falls to a fraction of a wet-trade site.
The second shift is tolerance. A factory floor holds dimensional accuracy that a monsoon-exposed site cannot. That accuracy compounds: better tolerance means better facade interfaces, which means fewer sealant failures a decade later.
The obstacle is no longer technology. It is procurement culture. Precast rewards early design freeze and punishes late change, which means clients must be willing to make decisions earlier than they are used to. The projects that accept that discipline are consistently the ones delivered on time.