Indicative 4 kWp install in Derby: £6,750–£7,950. Region: UK average (×0.99). Annual irradiance: ~920 kWh/kWp.
What Derby homeowners actually pay
Derby benefits from healthy installer competition tied to the Rolls-Royce supply chain, simple 1950s–70s housing stock across Mickleover, Littleover and Allestree, and slightly above-average East Midlands irradiance. A 4 kWp install typically lands in the £5,900–£7,500 range, with generation around 3,660 kWh/yr. Payback for a typical bill-payer with a SEG export tariff and modest battery sits at roughly 8–10 years, comfortably inside the 25-year panel warranty window.
Local notes for Derby
National Grid Electricity Distribution (ex Western Power) covers DE postcodes — G99 typically 5–7 weeks.
East Midlands irradiance ~915 kWh/kWp/yr — slightly above the UK average.
Large stock of post-war Mickleover and Allestree semis — uniform tile roofs keep labour quick.
Active local installer market (Rolls-Royce supply chain) — quote competition is healthy.
Field notes
Generation ~3,660 kWh/yr from a typical 4 kWp array.
Cash prices ~3–5% below national average.
DNO is National Grid Electricity Distribution — G99 typically 5–7 weeks.
Frequently asked questions
Why is Derby cheaper than Nottingham for solar?
Slightly larger pool of independent installers serving the Rolls-Royce belt, and more uniform post-war housing stock that keeps scaffolding and labour predictable.
What size system fits a typical Derby home?
4 kWp on most Mickleover, Littleover or Allestree semis. Detached homes in Mickleover or Quarndon often fit 5–6 kWp.