How many solar panels will fit my roof?
See how many panels fit your own roof
Enter your address. We read your roof from aerial imagery, so there is no photo and no measuring, and price the system that fits.
Free · No photo needed · No sales call
Panels by roof area
| Sunny roof area | Panels | System size | Fitted, scaffolding included |
|---|---|---|---|
| 15 m² | 5 | 1.88 kW | £3,000 – £3,400 |
| 20 m² | 7 | 2.63 kW | £4,100 – £4,700 |
| 25 m² | 9 | 3.38 kW | £5,300 – £5,900 |
| 30 m² | 11 | 4.13 kW | £6,400 – £7,200 |
| 40 m² | 15 | 5.63 kW | £8,600 – £9,600 |
We count about 70% of each slope as usable, because panels keep clear of the edges, the ridge, vents and roof windows. Our estimates stop at 16 panels (6 kW), the largest system in our price list.
Which slopes count
Slopes facing anywhere from east, through south, to west, at a pitch between 10° and 60°. South-facing slopes make the most; east and west make less but are still worth using. North-facing slopes are left out of our count.
Shade matters as well: a tall tree, a chimney or the house next door can take a panel or two out of use, which an installer checks on site.
Your own roof, without measuring
Enter your address and we read your roof from aerial imagery: which slopes face which way, how steep they are and how much room they have. It takes a few seconds and needs no photo.
What is included in these prices
The panels and their fitting, the scaffolding to reach the roof, and VAT at the rate that applies today.
Not included: a battery, an EV charger, roof repairs, anything structural.
Planning estimate or quotation?
Every figure on this page is a planning estimate: what a system like this typically costs, for budgeting and for judging the quotes you get. It is not a quotation. A quotation comes from an installer after a survey, when your roof, your wiring and any shading are known.
Facet Pro narrows the estimate to your own roof from aerial imagery: enter your address and we count the panels that fit the slopes facing the sun. Your installer confirms the system and price on site.
Common questions
How many solar panels does a typical UK house need?
Most homes have room for 7 to 16 panels on the slopes that face the sun, which is 2.63 kW to 6 kW.
How much roof space does a solar panel need?
About 1.8 m² for each panel, plus space around the edges of the roof.
Can solar panels go on a north-facing roof?
They can be fitted, but they make much less electricity, so we leave north-facing slopes out of the count.
Your roof isn’t average.
See how many panels fit your own roof, with a planning estimate. Any figure on this page is for a typical roof. Enter your address and we read your roof from aerial imagery: which slopes face the sun, how steep they are and how much room they have.
Free · No photo needed · No sales call
Your address is sent to Google to find your roof. We do not keep it. Privacy
These are planning estimates — not a quotation, and not a survey. Solar figures come from an installer price list checked against government solar cost data, with scaffolding included and VAT at the rate that applies today. They do not estimate what panels will save. Your installer confirms the system and price on site. Prices checked November 2026.