The third phase of the Buildability cycle is construction.  The following points should be considered at the construction stage to improve the environmental impact of the build.

Assembly techniques should be compatible with standard not specialist techniques
Plan for simplicity of assembly and logical trade sequences
Achievable tolerances
Energy efficiency and pollution control on site – generators, lighting, plant etc
Vigorous separation and segregation of waste
Consider new, untried site recycling initiatives (plasterboard, paint tins etc)

The fourth stage to be looked at is the management and maintenance of the building and facilities.