Indicative 4 kWp install in Cambridge: £6,450–£8,550. Region: South East (×1.04). Annual irradiance: ~970 kWh/kWp.
What Cambridge homeowners actually pay
Cambridge sits in one of the sunniest corners of England — ~955 kWh/kWp/yr, only narrowly behind the south coast — with a competitive installer market spanning the Cambridge–Peterborough corridor. A 4 kWp install on a typical Chesterton or Cherry Hinton semi lands £6,450–£8,550, generates around 3,820 kWh per year and pays back in roughly 11–15 years. Expect heritage constraints in the centre and around the colleges, where listed status and Article 4 directions should be checked; front-roof panels are not automatically excluded.
Local notes for Cambridge
East-of-England irradiance ~955 kWh/kWp/yr — flat, dry climate is ideal for solar.
Central conservation areas around the colleges — roof panels are not excluded merely because they face a road; check Article 4 directions and listed status.
Many post-war estates (Arbury, Chesterton) have generous south-facing slopes for 5–6 kWp.
DNO is UK Power Networks — typical G99 sign-off in 4–6 weeks.
Field notes
Among the highest UK irradiance figures — ~3,820 kWh/yr from 4 kWp.
Strong post-war housing stock — most homes take 4–6 kWp comfortably.
DNO is UK Power Networks — G99 typically signs off in 4–6 weeks.
Frequently asked questions
Why is solar payback faster in Cambridge?
A combination of high irradiance (~955 kWh/kWp), competitive installer pricing and a high proportion of homes already on time-of-use tariffs makes Cambridge one of the better-paying solar locations in the UK.
What system size suits a typical Cambridge home?
4 kWp comfortably for Chesterton, Cherry Hinton or Arbury semis. Detached homes in Trumpington or Newnham often fit 5–6 kWp with battery.