Green building rates a design against a list of measures and awards a level.
The system succeeded in changing what developers build and has a structural weakness.
It rates the design rather than the finished building in use.
Measured performance after from the predicted figure by a wide margin in most studies.
The gap is not fraud; it is the distance between a model and a building with people in it.
open windows, add equipment and run systems in ways no assumed.
Controls designed to be automatic are frequently disabled in the first month by somebody who was cold.
Certification that requires measured data after two years of closes most of the gap.
It is also unpopular, because a developer has usually sold the building by then.
is the second omission and the larger one for a new building.
Concrete and steel account for most of the emissions of a structure before anybody occupies it.
A rating that counts only operating energy therefore rewards demolition and rebuilding over reuse.
Retaining a structure and replacing its systems is almost always the lower-carbon option and rarely the higher-rated one.
Several schemes have added embodied carbon recently, and the remains generous to new construction.
A standard is a description of what its authors considered measurable, and it becomes a description of what the industry builds.