⚡ Quick Answer
In the UK, a south-facing roof is generally considered the optimal direction for solar panels because it receives direct daylight for the longest period across the middle of the day. However, east-facing and west-facing roofs are also highly viable, generating approximately 85% to 90% of the electricity of a south-facing roof while aligning generation with morning and evening household demand.
Why does roof direction matter for solar panels?
Solar photovoltaic (PV) panels generate electricity when daylight reaches their photovoltaic cells. The compass direction your roof faces determines what time of day the panels receive peak sunlight intensity and how much total solar electricity your system can produce over the course of a year.
However, roof direction is only one component of intelligent system design. A roof with an east-west orientation and zero shading often delivers better real-world performance and higher self-consumption than a south-facing roof that is partially shaded by trees, chimneys, or neighbouring properties.
Are south-facing solar panels best in the UK?
South-facing solar panels typically deliver the highest annual kilowatt-hour (kWh) yield in the UK. Because the UK is situated in the northern hemisphere, the sun tracks across the southern portion of the sky, allowing south-facing panels to capture solar radiation from late morning through mid-afternoon.
- Maximum annual output: Delivers ~100% of benchmark generation.
- Ideal for battery charging: Provides sustained midday generation to fully charge home battery storage.
- Great for daytime consumption: Perfect for people who work from home or run high-draw appliances during the day.
- Highest return on investment: Maximises potential export earnings through the Smart Export Guarantee (SEG).
Do east-facing and west-facing solar panels work?
Yes, exceptionally well. East-facing panels catch early morning sunlight, which is ideal for households waking up, making breakfast, and running morning laundry cycles. West-facing panels catch late afternoon and evening sunlight, providing free electricity during the peak 4:00pm to 7:00pm window when grid electricity prices are often highest.
In fact, many modern UK homes install an East-West split array (panels installed on both pitches). This creates a smoother, broader energy generation curve throughout the entire day rather than a single sharp midday spike.
| Roof Direction | Relative Efficiency | Peak Generation Window | Best Suited For |
|---|---|---|---|
| South | 100% (Baseline) | 11:00am – 3:00pm | Maximum generation & battery storage |
| South-East / South-West | 93% – 97% | 10:00am – 4:00pm | Excellent balance of generation and daytime use |
| East / West | 82% – 88% | Morning (East) / Afternoon (West) | Direct household self-consumption |
| North | 50% – 60% | Diffuse light only | Generally not recommended unless pitch is very low (<15°) |
Can you put solar panels on a north-facing roof?
Direct north-facing installations are rarely recommended on standard pitched roofs (30° to 45°) because output drops to around 50-60% of a south-facing equivalent. However, on shallow pitched roofs (under 15°) or flat roofs with angled mounting frames, panels can still generate satisfactory returns.
How roof pitch (tilt) affects performance
In the UK, the optimal roof pitch for solar panels is between 30° and 40°. Conveniently, most British residential roofs are built with an angle of 30° to 35°, making standard UK housing naturally well-suited for solar technology.
Key takeaways
- South-facing is best for maximum total electricity output and battery systems.
- East and west roofs generate 85%+ of south-facing systems and offer superior self-consumption timing.
- Shading matters more than compass direction: An unshaded east roof will often beat a shaded south roof.
- Professional survey: World Solar uses 3D satellite modelling to calculate exact expected generation for your specific roof.