Typical Solar Panel Costs in the UK
Solar pricing varies a lot between households because your roof, system size, access, installer, and equipment choices all affect the quote. This page is not a price promise — it’s a practical guide to what moves the number and what to compare so your calculator inputs are sensible.
What makes up the cost?
- Panels: brand, efficiency, warranty length, and quantity.
- Inverter: central inverter vs micro-inverters; warranty and reliability matter.
- Mounting & roof work: roof type, complexity, access/scaffolding.
- Electrical work: consumer unit upgrades, cable runs, monitoring.
- Labour & overhead: installer quality, demand, travel, aftercare.
System size and “value per kW”
Many quotes scale roughly with system size, but not perfectly. There’s often a “fixed cost” baseline (scaffolding, planning, call-outs) which means small systems can look expensive per kW, while bigger systems can look cheaper per kW.
When comparing quotes, ask:
- What system size (kW) is being proposed?
- What estimated annual generation (kWh) are they claiming — and how did they estimate it?
- What warranties are included for panels, inverter, and workmanship?
Batteries: cost and sizing considerations
Battery pricing depends on capacity (kWh), power (kW), chemistry, warranty terms, and brand. The key point:
- Batteries can increase self-consumption (often improving savings), but increase upfront cost.
That’s why we included the battery toggle in the calculator: you want to see how your payback changes if the battery increases self-use by (say) 15–30 percentage points under your own assumptions.
How to sanity-check installer quotes
- Compare like-for-like: same size system, similar equipment, same warranty depth.
- Check generation assumptions: overly optimistic kWh estimates inflate expected savings.
- Ask about monitoring: you want visibility to spot underperformance.
- Workmanship warranty: an installer willing to stand behind the work matters.
Using costs in the calculator
If you’re early-stage and don’t have quotes yet, use a mid-range estimate to explore the scenario. Once you have quotes, update the cost input and rerun the calculation. If you want a conservative view, use your highest quote or add a buffer.