Scroll down to add more detail and refine your estimates — or trace your roof outline on the map below.
Refine your estimate
Add a few more details for a sharper figure.
The estimate above is based on your building size and bill. Answer the questions below and the numbers update in real time — roof orientation alone can move the saving by 15–40%, and whether you're profitable determines whether Corp Tax relief reduces your net cost by 25%.
Enter your actual usable roof area for a more precise system size. Leave blank to use the size picker estimate.
Tenants can still benefit from solar — we'll explain the options in your report.
Affects how much your panels generate. South-facing adds ~10% over a flat roof; north-facing reduces output by ~35%. Figures update as you change this.
Trees, adjacent buildings or plant equipment can reduce generation significantly. Heavy shading can cut output by 35%.
Solar only saves money when you're using the power it generates. A daytime business captures ~80% of output; evening-only use drops to ~45%. This is the single biggest variable in your saving figure.
Your actual rate from a recent bill gives a much more accurate saving figure. UK commercial rates currently range from 22p–35p/kWh. Leaving this blank uses the 28p default.
If you already have panels we'd assess your current system as part of the survey — there may be scope to expand or add battery storage alongside it.
A UK limited company with taxable profit can claim 25% of the install cost back via Annual Investment Allowance — this is shown as Corp Tax relief in the figures. Not applicable to loss-making businesses or sole traders (take specific tax advice).
Optional — refine with your roof outline
Trace your roof for a more accurate estimate.
Search your postcode, then click to draw around your roof or site area. This gives RED Energy a much more accurate picture before the site survey — and will update your estimates above.
Search your postcode above, then click on the map to start drawing your roof outline. Click your starting point to close and calculate the area.
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Roof area traced — your estimates have been updated.
Upload your latest electricity bill and pick a time for a call — RED Energy will prepare a full system design, fixed price and funding comparison ready to discuss.
Full designSystem layout, panel count, inverter spec and projected output
Fixed priceA firm installation price with no hidden extras
Funding optionsCash, finance and PPA compared side by side
📄Click to upload your billPDF, JPG or PNG · max 5MB
Preferred days for a call
Preferred time
RED Energy will confirm your call time by email. No commitment required — this is a free, no-obligation design consultation.
You're booked in
We'll confirm your call time by email within one working day. In the meantime, if you'd like to speak to someone sooner call us on 0330 134 8624.
