In 2024, the loft — the default battery installation location — was formally disqualified by PAS 63100:2024. BSI and DESNZ went further: they named outside the dwelling as the preferred location. Terraced houses — the largest segment of retrofit targets — have no garage, no utility room, and no wall space for 80–100kg of equipment. There is also a technical constraint that rules out partial solutions: battery and hybrid inverter must be within 1 metre of each other. An outdoor enclosure that houses only the battery leaves the installer with a problem half-solved. Batterybox closes that gap: a lockable, weatherproof, stainless steel external enclosure that houses battery and hybrid inverter together, outside the building, at ground level.

Solar battery installations are growing faster than almost any other segment of the UK retrofit market — and every install involves a solar installer finding somewhere to put the equipment. In a large and growing proportion of those homes — no loft, no garage, no suitable wall — Batterybox is that answer. The market data, growth figures, regulatory context, and policy tailwinds that underpin this are set out in full in the stakeholder brief.

Battery and hybrid inverter together in one external enclosure, as manufacturers require. Stainless steel. A hinged middle panel means both components are accessible through one set of front doors — no loft access, no entering the property. Three configurations: Standard (5–7 kWh, natural ventilation), Standard+ (10–12 kWh, fan-assisted), Premium (10–12 kWh, centralised ventilation connection). PAS 63100:2024 compliant by design.

Solar installers (primary) — they hit the "no space" objection regularly and currently have nothing to offer. Social housing contractors (secondary) — can install and service without entering the occupied property. Homeowners via Bow Tie (direct) — lower volume, higher margin. A natural addition to any fabric-first retrofit package.

Seven decisions are needed before sell sheet, branding, website, and outreach can be finalised. The most urgent: confirm manufacturing cost, steel grade, finish, and colour options with the manufacturer; confirm brand direction (Batterybox by Bow Tie Construction); make one call to a specialist solar insurer to confirm the insurance benefit claim; and commission the 3D render. Once those are resolved, outreach to 10–15 warm installer contacts is enough to start building momentum toward the founding partner commitments needed to trigger the first production run. A sell sheet and a personal introduction is all that is needed to begin.