Solar panels for Grantham homes
A 4.4kW solar system in Grantham should produce roughly 4,457 kWh a year. That figure comes from PVGIS, the European Commission's solar model, run for Grantham itself rather than a national average, at 1,013 kWh per kW of panels on a south facing 35 degree roof.
Output follows the seasons. In Grantham the same 4.4kW system makes around 521 kWh in June and 154 kWh in December, and May is usually the strongest month. About 68% of the year's power arrives between April and September, which is why a battery matters more here in summer evenings than in the depths of winter.
Which roofs work best in Grantham
We design around your roof, not a brochure. In Grantham, moving the same ten panels from a south to an east and west roof drops yearly output to around 3,655 kWh. That is still well worth doing, and the morning and evening split often suits a household that is out during the day.
What you could save
At the current price cap of 26.32p per kWh and 12p for exported power, we estimate a Grantham home saves about £678 a year with panels alone, or about £821 with a 5.8kWh battery that stores the afternoon surplus for the evening. On our fixed prices that is a simple payback of around 9.6 years for panels and 11.3 years with a battery, before any energy price rises or cheaper overnight battery charging.
| System in Grantham | Makes a year | Est. saving | Fixed price | Payback |
|---|---|---|---|---|
| 4.4kW solar | 4,457 kWh | £678 | £6,495 | 9.6 years |
| 4.4kW solar + 5.8kWh battery | 4,457 kWh | £821 | £9,295 | 11.3 years |
| 6.2kW solar + 10kWh battery | 6,281 kWh | £1,040 | £12,495 | 12.0 years |
Solar panel prices in Grantham
Government MCS data for 2025/26 puts the average cost of a 4 to 10kW system in East Midlands at £1,642 per kW. Our 4.4kW package works out at £1,476 per kW, fully installed with scaffolding and 0% VAT, and the price on your quote is fixed once we have surveyed the roof.
Planning permission in Grantham
Most homes in Grantham do not need planning permission for roof panels. Under permitted development rules they can be fitted as long as they sit no more than 200mm proud of the roof and stay below the ridge. The exceptions are listed buildings and, in conservation areas, walls facing a road. The local planning authority is South Kesteven Council; if your home is listed or in a conservation area we check with them before quoting.
Your local install team
Grantham is covered by our East Midlands team, the same engineers who work in Nottingham, Lincoln, Loughborough. You get a surveyor within about a week and the fitting team you meet on install day works for us, not an agency.
Want to see the full process first? Read how an installation works, check the planning rules in detail or compare solar and battery packages.
