Does Your Roof Need to Face South for Solar Panels?

South facing is the best roof orientation for solar panels in the UK, but it is not the only one that makes financial sense. East, west, and even south-east or south-west roofs can still generate strong returns. The orientation affects how much electricity your panels produce, not whether solar works at all.

How Roof Orientation Affects Solar Output

Solar panels capture energy from sunlight, so the more directly they face the sun across the course of the day, the more electricity they generate. In the UK, the sun travels across the southern sky, which is why south facing roofs collect the most energy. However, the difference between south and other orientations is smaller than many homeowners expect.

• South facing: approximately 100% of maximum potential output
• South-east or south-west facing: approximately 93 to 95% of south output
• East or west facing: approximately 80 to 85% of south output
• North-east or north-west facing: approximately 65 to 75% of south output
• North facing: approximately 50 to 60% of south output

These figures are estimated averages and will vary with your specific roof pitch, local shading, and geographic location within the UK. A roof in Cornwall will outperform one in Edinburgh regardless of orientation, simply because it receives more annual sunshine.

East and West Facing Roofs: A Realistic Assessment

East and west facing roofs are extremely common for UK semi-detached and terraced properties. Many of these homes have their longest roof slope running roughly east-west, which means panels face either sunrise or sunset rather than midday sun. The total annual generation is estimated at 80 to 85% of a south facing equivalent, which still represents a worthwhile investment for most households.

There is an underappreciated benefit to east-west installations. East panels generate more in the morning and west panels peak in the afternoon. If panels are split across both slopes, the household sees a smoother, more spread-out generation curve rather than a sharp midday spike. This can actually improve self-consumption without a battery, because energy is available across a longer period of the day.

Learn more about the specific considerations for this setup in our article on east and west facing roof solar panels.

What About North Facing Roofs?

North facing roofs are the one orientation where caution is genuinely warranted. Estimated output is around 50 to 60% of a south facing roof. For a typical 4kW system that might generate 3,600 kWh/year on a south facing roof, a north facing equivalent would produce roughly 1,800 to 2,160 kWh/year. That reduction can extend the payback period significantly.

That said, north facing installations are not automatically unviable. If your electricity consumption is high, electricity prices remain elevated, and you can access grants or subsidies to reduce upfront costs, the numbers can still work. The calculation depends on your specific circumstances rather than a blanket rule.

Pitch Angle Matters Too

The angle of your roof, measured in degrees from horizontal, also affects output. For a south facing roof in the UK, the optimal pitch is approximately 30 to 35 degrees, which happens to match the pitch of most standard UK houses. Flat roofs can use angled mounting frames to achieve a similar result. Steeper roofs lose some efficiency but often compensate through better rain-shedding, which keeps panels cleaner.

A south-west facing roof at 30 degrees will outperform a due-south facing roof at a steep 60-degree pitch. The combination of orientation and pitch matters more than either factor alone.

Most UK Installations Are Not on Due-South Roofs

A significant proportion of the four million-plus solar installations already on UK homes are not on due-south roofs. Installers and homeowners have found that the financial case holds up well for anything from south-east to south-west, and often for east and west orientations too. Only genuinely north facing roofs tend to be ruled out at the initial assessment stage.

If you are unsure which way your roof faces, you do not need to guess. Check which way your roof faces using our free tool. Enter your postcode and we will show you the orientation of your roof slopes instantly.

Reducing the Cost to Improve the Case

For roofs that are not ideally oriented, reducing the upfront cost of installation can significantly improve the financial case. Government grants and schemes such as ECO4 and the forthcoming Warm Homes Plan may cover part or all of the installation cost for eligible households. Read our guide to solar panel grants available in the UK in 2026 to see what you might qualify for.