What should follow your main heating decision?

Set the heating and fabric direction first, then assess solar and battery options against the home’s revised electricity demand, roof constraints and tariff choices.

Why decide heating and fabric direction first?

Insulation can change heat demand and heating-system size. A heat pump can materially change electricity use and its timing. Those decisions create better inputs for assessing solar generation, battery capacity and tariffs; buying every technology as one bundle can conceal weak assumptions.

When can measures be coordinated?

Roof work can be coordinated with loft or solar access, and electrical upgrades may serve both a heat pump and solar-battery system. Coordination does not require one supplier or one contract. Keep separate designs and prices so the value and responsibility for each measure remain clear.

What evidence should each later decision use?

For insulation, use building construction, condition, moisture and ventilation evidence. For solar, use roof orientation, shading, structure and an annual generation estimate. For a battery, use interval consumption, solar export and tariff scenarios. None should be sold on a guaranteed payback without transparent assumptions.