Solar Panel Cost Calculator UK

The low-mid-high range reflects real 2026 UK installer quote variance (±14%). The mid figure matches average MCS-certified installer pricing from 2024-2025 installs. Actual quotes vary by installer workload, roof complexity (pitch, tile type, scaffolding access), battery brand, and inverter choice. Use the result as a budgeting starting point — always get 3+ quotes before signing.

From April 2022 until March 2027, the UK government has set VAT at 0% on solar panel installations (including battery storage when installed at the same time). This saves the typical homeowner £700-£2,500 vs the previous 5% VAT rate. All figures in this calculator reflect 0% VAT.

Without a battery, you can only use solar energy when it's being generated — typically 30% of what you produce, because most household usage is in the morning and evening when the sun is low or absent. A battery stores excess daytime generation for evening use, pushing self-use up to 55-85%. Self-used energy saves £0.28/kWh at current import tariffs; exported energy earns £0.15/kWh under SEG — so batteries often pay back their extra cost in 7-10 years.

Payback is the number of years of annual savings needed to recoup your upfront cost. After payback, all subsequent savings are net profit. With 25-year panel warranties and ~30-year panel lifespans, most systems generate 15-20 years of pure profit after payback. The calculator shows a simple payback (no inflation, discount, or compounding) — realistic payback is typically 1-2 years shorter because energy prices historically rise faster than inflation.

Usually no — solar panels on domestic properties are Permitted Development under Class A, provided they don't protrude more than 20cm above the roof surface and don't extend beyond the roof plane. Exceptions: listed buildings, conservation areas (front-facing roofs), flats, and systems above 50kW. Your MCS installer handles the DNO application (G98/G99 — required for all grid-connected systems).

Only use MCS (Microgeneration Certification Scheme) certified installers — this is required for SEG registration and ensures warranty compliance. Get at least 3 quotes, inspect for itemised panel model / inverter model (not just "premium Tier 1"), and check Trustpilot plus Checkatrade reviews. Avoid door-to-door high-pressure sales; the MCS installer directory at mcscertified.com is trustworthy.