How Much Do Solar Panels Cost Per kW in the UK?

Understanding Cost Per kW

Solar panel pricing is often quoted per kilowatt (kW) of capacity. This helps compare different system sizes and installers.

Current UK Costs Per kW (2026)

System Size

Total Cost

Cost Per kW

3kW	£5,000-£6,000	£1,670-£2,000/kW
4kW	£6,000-£7,500	£1,500-£1,875/kW
5kW	£7,000-£8,500	£1,400-£1,700/kW
6kW	£8,000-£10,000	£1,333-£1,667/kW
8kW	£10,000-£12,000	£1,250-£1,500/kW
10kW	£12,000-£14,000	£1,200-£1,400/kW

Key insight: Larger systems have lower cost per kW due to economies of scale.

What's Included in the Price?

A quality quote should include:

• Solar panels
• Inverter or microinverters
• Mounting system
• All wiring and isolators
• Scaffolding
• DNO notification
• MCS certification
• 10-year workmanship warranty

What Affects Cost Per kW?

Factors That Increase Cost

1. Roof complexity - Multiple pitches, valleys, dormers

2. Roof type - Slate costs more than concrete tile

3. Access difficulty - Scaffolding challenges

4. Premium panels - Higher efficiency brands

5. Location - London/SE typically 10% higher

Factors That Reduce Cost

1. Larger system - Better economies of scale

2. Simple roof - Single pitch, easy access

3. Standard tile - Concrete or clay

4. Group purchase - Multiple homes together

Comparing Quotes

When comparing, ensure you're comparing:

• Same system size (kW)
• Same panel brand/model
• Same inverter type
• Same warranty terms
• Same inclusions (scaffolding, DNO, etc.)

Our Pricing

At SOLA UK, our typical cost per kW:

• 4kW system: £1,500-£1,750/kW
• 6kW system: £1,400-£1,600/kW
• 8kW system: £1,300-£1,500/kW

All quotes include everything - no hidden extras.

Next Steps

Get your personalised quote based on your actual roof and requirements. Our free survey provides an exact, fixed price.