What follows extends the previous chapter on buildings by systematically integrating the thermal, lighting, power and heating components of the retrofit proposal it serves to highlight the significance of. In particular, it provides an account of how to set the baseline needed to confirm the relative underperformance of buildings and improvements that can be made to the fabric of buildings which the case study relates to. Again this draws upon the Energy Options Appraisal and translation of this assessment into the STVR and PVTVR ratios deployed here as baseline calculations for the context-specific urban forms making up the fabric of the building designs rendered by way of and through ArcGIS software. However, in drawing upon this 3D city model as a means to systematically integrate the construction systems as key components of the assessment, the case study does not reduce energy performance to a mere head count, i.e. a measure of energy consumption and carbon emission to a per capita ratio, but instead bases this on the social-demographic structure of the environmental profile relevant to such an evaluation.