The first or ‘standard’ option proposed insulation to all existing elements and accepted continued thermal bridging at complex junctions. Whereas the second ‘EnerPHit’ option proposed to extend the existing building to simplify the thermal envelope and thereby reduce the ‘form factor’ and resulting heat losses. This option also super-insulated the roof and extended the insulation zone below ground to create a thermal ‘skirt’. These options included specialist input from structural engineers (Wilde Carter Clack) and M&E consultants (NLG) with an outline cost study prepared by the quantity surveyors (Keegans). A comparative cost was also prepared to understand the likely cost of demolition and rebuild although this was significantly more expensive than both refurbishment options. FIN DETAIL ENCLOSED WALKWAYS WINDOW DETAIL ECD ARCHITECTS: A NEW MODEL FOR TACKLING ESTATE REFURBISHMENT AND FUEL POVERTY | 15 SECTION