Solar Panels on a North-Facing Roof

If your home faces north — or north-west — the first thing most solar guides will tell you is to give up. That advice is too blunt. The real picture is more nuanced: north-facing solar in the UK is not the automatic dead end it is often presented as, but it does require honest maths before you commit. This guide walks through the output figures, the conditions under which it still makes financial sense, and the alternatives that usually work better.

What the output figures actually say

A north-facing roof generates roughly 50–60% of the annual output of an equivalent south-facing installation. For a typical 4 kWp system in England, the Energy Saving Trust’s solar calculator indicates a south-facing yield of approximately 3,400–4,200 kWh per year depending on location and shading. On a north-facing roof, that same system would produce around 1,700–2,500 kWh per year — a meaningful reduction that narrows the financial return considerably.

The loss is not uniform across the year. In summer, when the sun is high in the sky, a north-facing array still catches scattered and reflected light and can produce a reasonable fraction of its rated output. In winter, when the sun barely clears the horizon and tracks across the southern sky entirely, a north-facing roof can generate negligible electricity for weeks at a time. The seasonal asymmetry matters because UK households tend to have higher electricity demand in winter.

These figures come from PVGIS, the European Commission’s photovoltaic irradiance database, which MCS-accredited installers use as a standard reference. Any reputable installer should be able to model your specific address, roof pitch, and orientation in PVGIS before giving you a quote — if they don’t, ask them to.

For a full breakdown of how each orientation compares, see our guide to roof orientation and solar panel output.

When north-facing solar still makes financial sense

The lower output does not automatically make the project unviable — it depends on your specific situation. Three factors can shift the calculation in favour of proceeding:

1. You have a large roof with room for more panels

If the output per panel is lower, the most direct response is to fit more panels. A north-facing roof with space for 14–16 panels can match the annual output of a 10-panel south-facing system. The hardware cost rises, but the per-kWh economics can still hold up if the roof area is generous and shading is minimal. Your installer should model the full array before quoting — a 4 kWp system designed for a south-facing roof is almost certainly undersized for a north-facing one.

2. You pair the system with a battery and a time-of-use tariff

On a north-facing roof, the generation profile is flatter and lower than south-facing — which means the proportion of electricity you use directly as it is generated (self-consumption) actually tends to be higher, because the system is not producing sharp midday peaks that your household cannot absorb. Add a home battery and you can capture whatever surplus there is and shift it to the evening peak. On a time-of-use tariff such as Intelligent Octopus Go, the battery can also charge from cheap overnight grid electricity, adding a separate strand of savings that does not depend on roof orientation at all. In that configuration, the north-facing penalty matters less.

3. You are a high electricity user

A household consuming 5,000–6,000 kWh per year — running an electric vehicle, a heat pump, or both — has more to gain from any solar generation than an average household. Even 1,800 kWh of annual self-consumed solar at 24.5p/kWh saves around £440 per year. At that rate, a north-facing system can still pay back within a reasonable horizon if installation costs are kept in check.

The east–west alternative

If your home is a standard UK terrace with a ridge running east–west, you almost certainly have both a north-facing and a south-facing slope. In that case, the right question is not “should I put panels on the north slope?” but “how should I split the array between both slopes?”

A split east–west array — where panels are fitted on both sides of the ridge — typically generates 80–85% of the output of a pure south-facing array, according to Energy Saving Trust benchmarks. That is meaningfully better than a north-facing-only system, and it has the added benefit of spreading generation across more hours of the day: east-facing panels catch morning sun, west-facing panels catch afternoon and evening sun. The extended generation window improves self-consumption without needing a battery.

For homes where the main habitable roof slope faces north, fitting panels on the south-facing rear slope (even if it is smaller) is almost always the better starting point. Your installer can assess what proportion of available roof area is on each side and model accordingly. See our article on solar panel costs and savings for how system size and orientation interact with overall return.

If north-facing is truly your only option

Some homes have no south, east, or west-facing roof at all — end-of-terrace properties where the ridge runs north–south, or homes with large rear extensions that shade the southern slope. In those cases, the practical alternatives are:

Ground-mounted panels — if you have a garden with unobstructed southern aspect, a ground-mounted array on adjustable frames can face due south at the optimal tilt angle regardless of your roof. Cost is higher due to mounting and trenching, but the output is unconstrained by the house orientation.
Solar carport or outbuilding roof — a garage, outbuilding, or covered parking structure with a south-facing aspect can host a small array that supplements or replaces a rooftop installation.
A smaller north-facing array, honestly sized — if ground options are not available, a north-facing rooftop system sized to your realistic winter output (not the summer peak) can still generate meaningful electricity. The key is avoiding oversizing: paying for 16 panels when your usage and battery can only absorb the output of ten is poor value.

In all cases, the Energy Saving Trust recommends getting at least two quotes from MCS-certified installers who will carry out a site survey before quoting — a credible installer will tell you honestly whether a north-facing installation is worth proceeding with on your specific property.

What to ask an installer

Before accepting a quote for a north-facing installation, ask your installer to:

Show you the PVGIS output estimate for your specific address, roof pitch, and orientation — not a rule-of-thumb figure.
Model both a north-facing-only and a split (north + south, or east + west) layout so you can compare the two.
Confirm the payback period calculation uses your actual annual electricity consumption, not a national average.
Assess shading from chimneys, neighbouring buildings, and trees — a north-facing roof already has lower irradiance; additional shading compounds the loss sharply.

If solar looks marginal on your property, it is worth checking whether any of the solar grants and funding schemes currently available in the UK could improve the economics before ruling it out entirely.