Solar panels on a north-facing roof still generate meaningful electricity in the UK – typically 40-50% less than an equivalent south-facing installation, but that’s a reduction, not a dealbreaker, and for some households a north-facing array is still worthwhile once the alternative (no solar at all) is the honest comparison. The right decision depends on your specific roof options and what you’re trying to achieve, not a blanket rule that north-facing is never worth it.
How Much Less Electricity a North-Facing Roof Actually Generates
| Orientation | Typical output relative to true south |
|---|---|
| South | 100% (baseline) |
| South-east / South-west | 90-95% |
| East / West | 80-85% |
| North-east / North-west | 60-70% |
| North | 50-60% |
These are general planning figures – actual output also depends on roof pitch, local shading, and latitude, so a shallow-pitched north roof in southern England can sometimes slightly outperform a steeply-pitched north roof further north, even though both are nominally “north-facing.”
When Installing Solar on a North-Facing Roof Still Makes Sense
When it\u2019s genuinely your only usable roof space
If your property only has a north-facing roof (some terraced houses and certain plot orientations leave no real choice), a reduced-output north installation is still likely to generate a worthwhile return over 25 years, just with a longer payback period than a south-facing equivalent. The alternative isn’t a better-oriented system – it’s no solar at all.
When it complements a south-facing array rather than replacing one
Adding a modest north-facing array alongside a primary south-facing system can still contribute usefully, particularly if you have spare roof space and your main array is already sized to your budget or export limit. It won’t perform as well per panel, but it adds absolute generation at a lower marginal cost than, say, replacing perfectly good south panels with higher-efficiency ones.
Comparing North-Facing Solar to the Realistic Alternatives
Before committing to a north-facing roof installation, it’s worth checking whether ground-mounted panels elsewhere on your property, or a well-designed east/west split (see our guide on horizontal vs vertical panel installation) might deliver better output for similar or lower cost than accepting the north-facing reduction. A proper site survey comparing these options side by side is worth the modest time investment before committing.
Does a North-Facing Array Still Pay for Itself?
Generally yes, just more slowly. Where a well-sited south array might pay back in 8-12 years, a genuinely north-facing equivalent might take 15-20 years – still well within a typical 25-30 year panel lifespan, but a materially weaker return that’s worth going into with clear eyes rather than assuming identical economics to a south-facing quote you might have seen elsewhere.
Frequently Asked Questions About Solar Panels on a North-Facing Roof
Is it worth installing solar panels on a north-facing roof in the UK?
It can be, particularly if it’s your only available roof space, though expect roughly 40-50% lower output and a correspondingly longer payback period than a south-facing system. It’s rarely the first choice when better-oriented options exist, but it’s not automatically a poor investment either.
Will an installer refuse to fit solar panels on a north-facing roof?
A reputable installer should still quote and install a north-facing system if you want one, while giving you an honest, realistic output estimate for that orientation. They may reasonably suggest alternatives (ground-mounted, or a different roof face) if better options exist on your property, but the choice is ultimately yours.
Does a flat roof change the north-facing problem?
Yes, meaningfully – on a flat roof, panels are mounted on tilt frames that can be angled towards true south regardless of which way the building itself faces, largely avoiding the north-facing penalty altogether. This is one of the genuine advantages flat roofs have over fixed-pitch roofs in a north-facing scenario.
Do power optimisers help north-facing solar panels perform better?
Optimisers help more with uneven shading across a string than with a uniformly reduced-output orientation like north-facing – they won’t recover the fundamental output loss from poor orientation itself, though they can help if a north-facing array also suffers partial shading at certain times of day.
