Every building retrofit project is different – there are no one-size-fits-all solutions to building energy efficiency. Building owners need to consult properly qualified building practitioners to work out which actions and technologies are right for their building.
Retrofit projects do have common goals and benefits though.
There are a variety of models for implementing a building retrofit project:
There is also a range of technologies applicable to energy and water efficiency.
If you're not sure of the terminology, have a look at the definitions.
See also: