Working file M4.2
Home battery storage cost (UK 2026)
Home battery storage cost: installed cost, VAT treatment, payback shape.
Cost in 2026
Home battery storage cost (UK 2026). The published installed range in 2026 is £700 to £1,050 per kWh installed (Solar Energy UK publisher), or £3,500 to £5,250 for a 5 kWh system AC-coupled to existing PV. Both ends of that range are stated rather than collapsed to a midpoint, because the spread reflects real differences in scope, access and grant eligibility rather than installer mark-up.
What drives the spread
- AC-coupled retrofit vs DC-coupled new-build.
- Cell chemistry: LFP is the 2026 default for residential.
- Tariff strategy: Octopus Cosy or Agile give the battery something to do.
- above 0% VAT applies until 31 March 2027 (extended in 2024 to include standalone batteries).
Where it sits in the PAS 2035 sequence
Renewables, paired with PV at design stage.
Surveyed 1 October 2026. Ofgem cap for 1 October to 31 December 2026 applied (gas 7.97p, elec 26.32p, gas standing 29.68p, elec standing 54.83p). Next scheduled review 25 November 2026 (January cap announcement). [ref M4.2]
By Oliver Wakefield-Smith, Founder, Digital Signet. Corrections to oliver at digitalsignet dot com.