West facing solar panels are absolutely worth it in the UK — and so are east facing ones. The direction your roof faces affects how much your system generates, but it does not determine whether solar is a sound investment for your home.
This is probably the single most common reason homeowners talk themselves out of solar before they've even spoken to an installer. They hear "south-facing is best", assume their house doesn't qualify, and leave the idea there. That's a shame, because the output gap between south and east or west is much smaller than most people expect — and for certain households, a west-facing roof can actually mean better bill savings than a south-facing one.
Here's the straight answer.
How Much Less Do East or West Facing Solar Panels Produce?
Less than most people fear. According to the Energy Saving Trust, a system facing east or west tends to generate around 15–20% less electricity per year than an equivalent south-facing system. That's the benchmark from one of the most authoritative consumer energy organisations in the UK — and it's worth sitting with for a moment.
A 15–20% reduction in output is not a 15–20% reduction in savings. The two things are not the same, and conflating them is where a lot of homeowners go wrong.
To put real numbers on it: a 4kWp system on a south-facing roof at the right pitch might generate around 3,400 kWh a year. The same system on a purely east- or west-facing roof would generate roughly 2,700–2,900 kWh — lower, yes, but still a substantial amount of electricity. On a typical dual-slope house where panels can go on both the east and west faces, the combined output closes the gap further still.
Are West Facing Solar Panels Worth It in the UK? (The Timing Argument)
Yes — and for households out during the day, a west-facing array can sometimes outperform a south-facing one in terms of actual bill impact.
Here's why. As the Energy Saving Trust's installation guide explains, east-facing panels generate more electricity in the morning, while west-facing panels do better in the afternoon and early evening. If you tend to use more power during those times, you could make better use of your solar energy as it's being produced.
A south-facing system concentrates its generation between roughly 10am and 2pm — peak solar hours. For a household where everyone is out at work or school, that midday electricity often goes unused and gets exported to the grid at a much lower rate than you'd save by using it yourself. West-facing panels shift that generation curve towards 3pm–7pm: cooking dinner, homework, TV, the washing machine running before bed. That's when many families actually use electricity.
The upshot: lower total generation from a west-facing array can mean higher self-consumption — more of what you generate goes directly into your home — which can mean better savings. Whether that applies to your household depends on your routine, your tariff, and whether you have a battery. But it's a real effect, not a sales pitch.
If you're out all day, it's well worth reading our guide on solar panels when you're out all day — it covers exactly how to maximise the value of generation that doesn't happen to coincide with when you're home.
What About a House With Both East and West Slopes?
This is actually a strong position to be in. If your house has a conventional pitched roof running roughly east–west (common in UK semi-detached and terraced properties), an installer can put panels on both slopes. This spreads generation across more of the day — east panels picking up the morning, west panels covering the afternoon — rather than concentrating everything in a midday peak.
The combined output of an east-west split is typically 10–20% less than a south-facing system of the same total size, but the generation profile is flatter and more useful for households that consume electricity throughout the day.
You can read more about the specifics of this layout in our dedicated guide to solar panels on an east-west roof.
Does Shading Matter More Than Direction?
Often, yes. The Energy Saving Trust is explicit on this point: a south-facing roof that is shaded during the day may actually generate less power than an unshaded east- or west-facing roof. Direction is only one part of the picture.
Shading from a chimney stack, a neighbouring building, or a tree that's grown over the years can cut output significantly — and it tends to have a disproportionate effect because one shaded panel can drag down the performance of others in the same string. A good MCS-certified installer will carry out a proper shading assessment as part of their survey, modelling your roof's sun exposure across different times of day and seasons, not just a sunny afternoon in July.
The honest message: before you worry about whether your roof faces the "right" direction, make sure you know whether it's actually in clear sun for most of the day. That matters more.
When Is a Non-South-Facing Roof Not Worth It?
It's only fair to say this clearly: there are situations where the direction of your roof, combined with other factors, does make solar a poor financial decision.
- North-facing only. The Energy Saving Trust does not recommend installing panels on a roof that faces north. In the UK, the sun stays in the southern half of the sky all year, and a north-facing slope receives so little direct sunlight that the numbers rarely stack up for a domestic installation.
- Heavily shaded east or west roof. If your east or west slope is partially blocked by a tall building, dense trees, or a large chimney for much of the day, the output loss on top of the directional reduction could push the payback period uncomfortably long.
- Very small usable roof area. If the east or west slope that's available only fits two or three panels, the system may be too small to generate meaningful savings.
- Very low electricity bills. If your household currently uses very little electricity, there's less to save regardless of direction — though even modest savings compound over a 25-year panel life.
Being straight about these edge cases is important. If any of them apply to you, a good installer will tell you — and if they don't, that's a red flag worth taking seriously. You can see what else to watch for in our guide to solar quote red flags.
The Smart Export Guarantee Still Pays You — Whatever Direction You Face
One thing that doesn't change based on your roof direction is your right to be paid for surplus electricity you export. Under the Smart Export Guarantee (SEG), energy suppliers with 150,000 or more customers are required to offer you a tariff for every unit of solar electricity that flows back to the grid — as long as your installation is MCS-certified and you have a compatible smart meter. The scheme is administered by Ofgem and has been in place since January 2020.
Export rates vary between suppliers, so it's worth shopping around — our guide to the best Smart Export Guarantee rates in 2026 covers the current options in detail. What matters here is simply that a west- or east-facing system still exports, still qualifies, and still earns you something for unused generation.
What to Do Next
The only way to know for certain whether solar makes sense for your specific roof — its direction, its pitch, its shading, your postcode's irradiance — is to get a proper assessment from a qualified installer. MCS-certified installers are required to model your roof's actual expected output based on orientation and shading, not just hand you a generic estimate.
Getting multiple quotes also matters. Prices and system designs vary, and comparing at least two or three proposals helps you spot whether an installer is giving you a realistic picture or a rosy one. For a step-by-step guide on what to look for, see how to compare solar quotes.
If your roof faces east or west and you've been quietly assuming solar isn't for you, it's worth at least finding out for certain. You can get free, no-obligation quotes from vetted local MCS-certified installers through FairSolar — no pushy sales calls, just a comparison based on your home.
Frequently asked questions
Are west facing solar panels worth it in the UK?
Yes, in most cases. According to the Energy Saving Trust, a west-facing system generates around 15–20% less electricity per year than a south-facing one — but west-facing panels peak in the afternoon and early evening, which for many households is actually when they use the most electricity. That better timing can make up for the lower total output in terms of real bill savings.
Do solar panels work on an east facing roof?
Yes. East-facing panels produce more electricity in the morning and perform well throughout the summer. You can expect roughly 15–20% less annual generation than a south-facing system of the same size, but that's still a meaningful amount of electricity, and the morning generation profile suits households that use energy earlier in the day.
How much less do east or west facing solar panels produce compared to south-facing?
The Energy Saving Trust puts the difference at around 15–20% less annual generation for a pure east- or west-facing system. If panels are split across both an east and west slope, the combined output is typically only 10–20% less than a south-facing system, and the generation is spread more usefully across the day.
Can I put panels on both my east and west slopes?
Yes, and this is often a good option for standard UK pitched roofs. Splitting panels across both slopes gives you a longer daily generation window — east panels catch the morning sun, west panels cover the afternoon — which can increase the amount of solar electricity you use directly rather than exporting at a lower rate.
My roof faces east or west — will I still qualify for the Smart Export Guarantee?
Yes. The Smart Export Guarantee pays you for surplus solar electricity exported to the grid regardless of which direction your panels face, as long as your installation is MCS-certified and you have a suitable smart meter. Roof direction has no bearing on your eligibility for export payments.