Energy performance is often discussed through equipment, but the fabric of the building sets the baseline. Poor insulation increases heating demand, reduces heat pump efficiency and leaves households exposed to higher running costs.
A fabric-first approach means improving the envelope before relying on systems to compensate. Walls, roofs, floors, glazing and airtightness all influence how hard the heating system must work.
This becomes more important under future standards because compliance depends on whole-building performance. A heat pump installed into a weak envelope may meet a specification but still perform poorly in use.
For developers, insulation is not a finishing detail. It is part of viability, comfort and long-term asset relevance.
The strongest homes will not simply have low-carbon technology attached. They will be designed so that technology can operate efficiently.