Solar Panel Cost Calculator: How Much Will You Really Pay?

Quick Cost Estimator

The cost of solar panels depends on several key factors. Use this guide to estimate your installation cost.

Step 1: Determine Your System Size

Your ideal system size depends on:

• Annual electricity usage: Check your bills for kWh consumed
• Roof space available: Typically 2m2 per panel
• Budget: Balance between cost and generation

Annual Usage

Recommended System

Approx. Cost

Under 2,500 kWh	3kW (8 panels)	£5,000-£6,500
2,500-3,500 kWh	4kW (10 panels)	£6,000-£7,500
3,500-4,500 kWh	5kW (12 panels)	£7,000-£8,500
4,500-6,000 kWh	6kW (15 panels)	£8,000-£10,000
Over 6,000 kWh	8-10kW (20+ panels)	£10,000-£14,000

Step 2: Add-Ons and Extras

Battery Storage:

• 5kWh battery: +£4,000-£5,000
• 10kWh battery: +£6,500-£8,000
• 13.5kWh (Tesla/GivEnergy): +£7,500-£10,000

EV Charger:

• Standard 7kW charger: +£800-£1,200
• Smart charger (Zappi/Ohme): +£1,200-£1,500

Premium Options:

• All-black panels: +£500-£800
• Microinverters: +£800-£1,500
• Bird protection mesh: +£150-£300

Step 3: Location Adjustments

Area	Adjustment

London/affluent areas	+10-15%
Rural areas	+5-10% (access)
Conservation areas	+£500-£1,000 (planning)
Listed buildings	+£1,000-£2,000 (specialist work)

Example Calculations

Example 1: 3-Bed Semi in Watford

• 4kW system: £6,500
• No battery: £0
• Standard install: £0
• Total: £6,500

Example 2: 4-Bed Detached in St Albans

• 6kW system: £9,000
• 10kWh battery: +£7,000
• Conservation area: +£500
• Total: £16,500

Example 3: Large Home in Radlett

• 10kW system: £13,000
• Tesla Powerwall: +£9,500
• Premium panels: +£700
• EV charger: +£1,300
• Total: £24,500

What Affects Your Final Price?

1. Roof type: Slate costs more than tile

2. Scaffolding needs: Complex roofs increase costs

3. Electrical work: Old consumer units may need upgrading

4. Access: Difficult access adds scaffolding costs

5. DNO requirements: G99 applications for larger systems

Getting an Accurate Quote

For a precise quote, you'll need:

• Recent electricity bills (12 months)
• Property photos (roof and consumer unit)
• Postcode for local pricing

Our free survey provides an exact, fixed-price quote with no hidden extras.