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Great British Insulation Scheme update: The Great British Insulation Scheme closed on 31 March 2026. For insulation funding, check the Warm Homes Plan via your local council, or ECO4 (until 31 December 2026) via an obligated supplier.
Energy Company Obligation (ECO4) update: ECO4 is scheduled to end on 31 December 2026. If you may be eligible, start the referral now — applications received close to the deadline may not complete in time.
Key Takeaways
- A north-facing roof in the UK typically generates 50 to 60% of the output of an identical south-facing system, according to data from the Microgeneration Certification Scheme (MCS) and the Energy Saving Trust.
- For a standard 4kW system, that means roughly 1,700 to 2,200 kWh per year instead of the 3,400 to 3,800 kWh a south-facing array would produce.
- North-facing solar can still make financial sense if you have high electricity usage, battery storage, or plan to stay in your home for 15 years or more.
- In many cases, spending the same budget on insulation or a ground-mounted system delivers a better return.
- An honest site survey from an MCS-certified installer is the only reliable way to get accurate figures for your specific roof.
Introduction: "My Roof Faces the Wrong Way"
If you have looked into solar panels and been told your north-facing roof makes them pointless, you are not alone. It is one of the most common reasons UK homeowners abandon the idea entirely. But the truth is more nuanced than a simple yes or no.
North-facing panels do produce less electricity. That is a physical fact, not an opinion. The question is whether the reduced output still delivers enough value to justify the investment, or whether your money would be better spent elsewhere. This guide walks you through the real numbers, the situations where north-facing solar still works, and the alternatives worth considering if it does not.
How Roof Orientation Affects Solar Output
Solar panels generate the most electricity when they face directly into sunlight. In the UK, which sits between 50 and 59 degrees north latitude, the sun tracks across the southern sky for most of the year. That is why south-facing roofs are considered optimal.
The MCS and Energy Saving Trust publish standardised performance data that installers use to estimate output. Here is how orientation compares for a typical 4kW residential system in central England.
Output by Orientation (4kW System, 35-Degree Pitch)
| Roof Orientation | % of Optimal Output | Estimated Annual Generation |
|---|---|---|
| South | 100% | 3,400 – 3,800 kWh |
| South-East / South-West | 90 – 95% | 3,060 – 3,610 kWh |
| East / West | 80 – 85% | 2,720 – 3,230 kWh |
| North-East / North-West | 60 – 70% | 2,040 – 2,660 kWh |
| North | 50 – 60% | 1,700 – 2,280 kWh |
These figures assume a roof pitch of around 35 degrees, which is typical for UK houses. A shallower pitch (below 20 degrees) narrows the gap between orientations because the panels receive more diffuse light from overhead. A steeper pitch makes the difference worse.
It is also worth noting that the UK receives a large proportion of its solar radiation as diffuse light, scattered by cloud cover rather than arriving as direct beam sunshine. Diffuse light is less sensitive to orientation, which is one reason north-facing panels in the UK perform better than you might expect compared to sunnier climates closer to the equator.
Roof Pitch Matters Too
Roof pitch interacts with orientation in an important way. A north-facing roof at 15 degrees may outperform a north-facing roof at 45 degrees by 10 to 15 percentage points. If your roof is relatively flat, the orientation penalty shrinks. Some installers can also use tilt frames to improve the angle, although these add cost and may require planning permission.
The Cost-Benefit Calculation for North-Facing Solar
Let us put real numbers on this. As of early 2026, a typical 4kW solar panel system costs between £5,500 and £8,000 installed, including VAT (currently 0% on residential solar until at least March 2027).
South-Facing Scenario
- Annual generation: 3,600 kWh
- Self-consumption (without battery): roughly 40%, or 1,440 kWh
- Savings at 24.5p/kWh (Ofgem cap rate): £353 per year
- SEG export income (2,160 kWh at 12p/kWh): £259 per year
- Total annual benefit: approximately £612
- Payback period on a £6,500 system: around 10.6 years
North-Facing Scenario
- Annual generation: 2,000 kWh
- Self-consumption (without battery): roughly 40%, or 800 kWh
- Savings at 24.5p/kWh: £196 per year
- SEG export income (1,200 kWh at 12p/kWh): £144 per year
- Total annual benefit: approximately £340
- Payback period on a £6,500 system: around 19 years
The installation cost is broadly similar regardless of orientation because you are paying for the same panels, inverter, scaffolding and labour. What changes is the return. A payback period approaching 20 years is a hard sell, especially when solar panels typically carry a performance warranty of 25 years and inverters last 10 to 15 years before needing replacement.
For more on the broader costs and savings of solar, see our solar and renewables guide.
When North-Facing Solar Does Make Sense
Despite the lower output, there are genuine scenarios where installing panels on a north-facing roof is a reasonable decision.
You Have High Electricity Consumption
If your household uses well above average electricity (for example, because you charge an electric vehicle at home, run a heat pump, or work from home with high energy demands) you can absorb a higher percentage of what the panels generate. A household using 6,000 to 8,000 kWh per year may self-consume 60 to 70% of a north-facing system's output, which improves the economics considerably.
At 70% self-consumption on 2,000 kWh, you would save £343 on grid electricity alone, before any export income.
You Add Battery Storage
A home battery (typically £3,000 to £7,000 for a 5 to 13 kWh unit) allows you to store daytime generation and use it in the evening. With a battery, self-consumption rates of 80% or higher are realistic even on a north-facing roof. The battery does add considerable upfront cost, but if you are already planning to install one (perhaps to take advantage of time-of-use tariffs) the combined system payback improves.
You Plan to Stay Long-Term
If you intend to live in the property for 20 years or more, even a 19-year payback delivers a positive return. Solar panels continue to generate electricity beyond the warranty period (output typically degrades by 0.5 to 0.7% per year), and electricity prices are unlikely to fall in real terms over the next two decades.
SEG Export Payments Help
The Smart Export Guarantee (SEG) requires licensed electricity suppliers with more than 150,000 customers to offer a tariff for exported solar electricity. Rates vary from around 3p to 15p/kWh depending on the supplier and tariff type. Agile or time-of-export tariffs linked to battery storage can push effective rates higher. While SEG income alone will not transform the economics, it does chip away at the payback period.
Your Roof Has Minimal Shading
A north-facing roof that is completely free from shade (no trees, chimneys, or neighbouring buildings casting shadows) will perform at the upper end of the 50 to 60% range. Shading is a far bigger enemy of solar output than orientation, so a shade-free north-facing roof can outperform a partially shaded south-facing one.
When North-Facing Solar Does Not Make Sense
There are equally clear situations where the honest advice is to spend your money differently.
Heavy Shading
If your north-facing roof also suffers from heavy shading (tall trees, nearby buildings, or large chimneys) the combined impact on output makes the investment very difficult to justify. Shading can reduce output by a further 20 to 50%, pushing your generation below 1,000 kWh per year. At that level, you are looking at a payback period well beyond the useful life of the system.
Very Steep Roof Pitch
A north-facing roof at 45 degrees or more will see noticeably worse performance than the averages quoted above. At steep pitches, the panels spend more of the year angled away from the sun, and the orientation penalty increases.
Limited Budget
This is the most important consideration. If you have £6,000 to £8,000 to invest in your home's energy performance and your roof faces north, you should seriously consider whether that money delivers a better return invested in insulation, draught-proofing, or other efficiency measures. Insulating a poorly insulated loft or upgrading to cavity wall insulation can save £200 to £400 per year with a payback period of 3 to 5 years. That is a much faster and more reliable return.
You Are Selling Soon
If you plan to move within the next 5 to 10 years, a north-facing system is unlikely to pay back before you leave. While solar panels can add value to a property, the premium is modest and buyers may not place a high value on a system with suboptimal orientation.
Alternatives to North-Facing Roof Panels
If you have decided that north-facing panels are not the right choice, here are the alternatives worth exploring.
Ground-Mounted Solar Panels
If you have garden space, a ground-mounted array can be positioned to face south at the optimal angle. Ground-mounted systems are typically 10 to 20% more expensive than roof-mounted ones due to the mounting framework and groundwork required, but the improved orientation more than compensates if your roof is unsuitable. You will usually need planning permission for ground-mounted panels, so check with your local authority first.
Solar Thermal for Hot Water
Solar thermal panels heat water directly rather than generating electricity. They are less sensitive to orientation than PV panels because they work partly on diffuse radiation and partly on ambient temperature. A solar thermal system typically costs £3,000 to £5,000 and can provide 50 to 70% of a household's hot water needs between April and September. If your primary goal is reducing hot water costs, solar thermal on a north-facing roof can still perform reasonably well.
Solar thermal installations may be eligible for support under the Boiler Upgrade Scheme (BUS). Check our grants guide for the latest eligibility criteria.
Invest in Insulation First
For many households, the best energy investment is not generation but reduction. If your home has poor insulation (particularly in the loft, walls or under the floor) addressing that first will save more money per pound spent than any solar installation. Our insulation guide covers the options and costs in detail.
You may also be eligible for insulation grants through schemes like ECO4 or the Great British Insulation Scheme. See our guide to applying for grants for more information.
Community Energy Schemes
Some areas of the UK have community energy schemes that allow you to invest in a shared solar installation (often on a south-facing commercial roof or open land) and receive a return proportional to your investment. This gives you the benefit of solar without needing suitable roof space of your own. Community Energy England maintains a directory of active schemes.
Getting an Accurate Quote
Online solar calculators are useful for rough estimates, but they cannot account for the specific characteristics of your roof: exact pitch, localised shading patterns throughout the year, structural condition, and cable routing. For a north-facing installation in particular, a proper site survey is essential because the margin for error is much thinner than on a south-facing roof.
When getting quotes, insist on the following.
- MCS-certified installer: This is a requirement for SEG eligibility and most grant schemes. MCS certification means the installer follows standardised procedures for estimating output.
- At least three quotes: Prices vary widely between installers, and so do output estimates. Comparing multiple quotes helps you spot outliers.
- Shading analysis: A reputable installer will use software (such as PV*SOL or similar) to model shading from surrounding objects at different times of year.
- Written output estimate: Ask for the estimated annual generation in kWh, not just a vague payback claim. This lets you verify the figures against MCS benchmarks.
- Honesty about your roof: A good installer will tell you if your north-facing roof is not a good candidate. Be wary of anyone who promises exceptional returns without a thorough survey.
Solar Grants and Funding Options
Even on a north-facing roof, the available grants and incentives apply equally.
Smart Export Guarantee (SEG)
All solar PV installations qualify for the SEG regardless of orientation. You will export less from a north-facing system, but the income still contributes to payback. Current rates range from around 3p to 15p per kWh depending on the supplier.
0% VAT on Solar
Residential solar panel installations currently benefit from 0% VAT, which saves you roughly £1,000 to £1,500 compared to the standard 20% rate. This relief is confirmed until at least March 2027.
ECO4 and the Great British Insulation Scheme
If you are on a low income or receive qualifying benefits, you may be eligible for fully or partially funded solar panel installation under the ECO4 scheme. The solar grants guide explains the eligibility criteria and application process in detail.
Boiler Upgrade Scheme (BUS)
While primarily aimed at heat pumps, the BUS also covers solar thermal installations with grants of up to £7,500. If solar thermal is a better fit for your north-facing roof, this can greatly reduce the cost.
For a complete overview of all available energy efficiency grants, see our government grants guide.
Frequently Asked Questions
Do solar panels work on a north-facing roof at all?
Yes. Solar panels generate electricity from daylight, not direct sunlight. A north-facing roof in the UK will still receive substantial diffuse light, producing 50 to 60% of what a south-facing installation would generate. Whether the reduced output justifies the cost depends on your circumstances.
How much less electricity will I generate?
For a typical 4kW system in central England, expect roughly 1,700 to 2,280 kWh per year on a north-facing roof at a standard 35-degree pitch, compared to 3,400 to 3,800 kWh on a south-facing roof.
Will an installer refuse to fit panels on a north-facing roof?
Some will, and that is not necessarily a bad sign. It may mean they are being honest. Others will install them provided you understand the reduced output. Always get a written estimate of expected generation in kWh before proceeding.
Can I use a battery to make north-facing solar more worthwhile?
A battery increases self-consumption, which improves the value of every kWh you generate. However, the battery itself adds £3,000 to £7,000 to the total cost. Run the numbers carefully. In some cases the combined payback period can still be attractive, particularly if you also benefit from time-of-use tariffs.
Is planning permission needed for solar panels on a north-facing roof?
Roof-mounted solar panels in England and Wales are usually permitted development and do not need planning permission, provided they do not protrude more than 200mm from the roof surface and are not on a listed building or in a conservation area. Ground-mounted panels are more likely to need permission. Check with your local planning authority.
Practical Next Steps
- Get a site survey: Contact two or three MCS-certified installers and request a detailed survey and written output estimate for your specific roof.
- Run the numbers: Use the output estimate to calculate your likely savings and payback period. Compare this against investing the same amount in insulation or other efficiency measures.
- Check grant eligibility: Review the solar grants guide and government grants guide to see if you qualify for financial support.
- Consider alternatives: If the payback period exceeds 15 years and you are not planning to stay that long, explore ground-mounted panels, solar thermal, or insulation as better uses of your budget.
- Make an informed decision: There is no shame in deciding north-facing solar is not right for your home. The best energy investment is the one that delivers the greatest return for your specific situation.
