Since early 2026, PassiHVAC has been undertaking SAP calculations and energy statements for private developers, with a particular focus on smaller residential schemes so far. It's a different world from the volume housebuilder end of the market: fewer standard house types to fall back on, less in-house technical resources on the client side, and often a planning department that has never seen the applicant's name before. A handful of patterns have shown up repeatedly across t