Most UK homes can use solar PV, but your results depend heavily on roof conditions. Energy Saving Trust notes PV works best on a south-facing roof with no shading, though other orientations can still work, and PV can generate electricity even on cloudy days.
A roof is usually suitable for photovoltaic panels if it has enough usable area, limited shading, and a decent orientation (south is ideal, but east/west can still perform). The best way to confirm is a site survey that checks shading through the day, roof condition, and space for a correctly sized system and safe installation access.
Step 1: Do you have enough usable roof area?
System size depends on roof space and layout. A survey should confirm:
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How many panels fit without crowding roof edges/obstacles
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Whether multiple roof faces can be used
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Any restrictions from roof windows, chimneys, vents
Step 2: Orientation and pitch (what “good” looks like)
Energy Saving Trust highlights:
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South-facing performs best in the UK
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Shading reduces output
Practical view: East/west systems can still be strong—often producing more spread-out generation across the day, which can help self-consumption.
Step 3: Shading (the biggest hidden performance killer)
Common shading sources:
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Chimneys and dormers
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Trees (especially in leaf season)
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Nearby buildings
Energy Saving Trust notes that shading affects performance and discusses options such as optimisers in relevant contexts.
What to ask in a quote
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Will you perform a shading assessment?
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Are you recommending optimisers/microinverters? Why?
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What generation estimate assumptions are you using?
Step 4: Roof condition and access
A good installer should check:
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Roof age/condition (to avoid re-doing work soon after)
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Safe access and scaffolding needs
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Fixing method appropriate to your roof type
Step 5: Planning and “special cases”
Energy Saving Trust notes PV often falls under permitted development, but exceptions can apply (e.g., listed buildings, conservation areas).
The 60-second suitability test
You’re likely a strong candidate if:
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✅ You have a decent expanse of unshaded roof
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✅ Your roof faces south/east/west (or you have a plan for shading)
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✅ You can use more electricity in daylight hours (or plan to export/store)
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✅ You’re happy to compare quotes and documentation carefully
FAQs
Do photovoltaic panels work on cloudy days?
Yes—Energy Saving Trust notes solar PV works even on cloudy days (though output is typically lower than in bright sun).
Is a north-facing roof suitable?
It’s usually less suitable than south/east/west. A survey can confirm whether output would justify the cost.
What if my roof is shaded?
You may still go solar, but system design matters more (panel layout, potential optimisers, and realistic generation estimates).
If you’re unsure about shading or roof space, get a survey-based quote that includes a generation estimate, equipment list, and installer handover pack.