Solar Panel Cost UK 2026: What You Should Actually Pay
Solar panel costs in the UK have fallen roughly 60% since 2012 and have stabilised over the past two years. The price you pay in 2026 depends on your roof, your location, and — more than anything — your installer. This guide gives you the numbers to check whether a quote is in the right range.
Average costs in 2026
A typical UK residential install — 4kWp to 6kWp, south-facing roof, no shading complications — costs between £6,000 and £10,000 fully installed including VAT. VAT on residential solar is zero-rated, so the figure you are quoted should already reflect that.
Per kWp: £1,500–£2,200 is the typical range. Below £1,400/kWp warrants scrutiny about panel quality or installer viability. Above £2,500/kWp for a standard install needs a clear justification (complex roof, listed building, premium panels).
A 4kWp system (10–12 panels): £6,000–£8,000
A 6kWp system (15–16 panels): £8,000–£12,000
Adding a battery (10kWh): £4,500–£6,500 on top
What drives the price
Panel brand and technology: Premium panels (REC Alpha, SunPower Maxeon) cost 30–50% more per panel than commodity PERC. The efficiency advantage is real but only matters if your roof space is limited.
Roof complexity: Flat roofs need ballasted mounting systems. Multiple roof planes, valleys, and chimneys require more labour. A steep roof takes longer. All of these add cost.
Scaffolding: A standard two-storey terraced house typically costs £400–£800 for scaffold erection and collection. Some installers include this; others quote it separately. Always clarify.
Inverter type: String inverters are the cheapest option and fine for unshaded roofs. Microinverters (one per panel) or optimisers add £200–£600 but improve output on shaded or multi-aspect roofs.
Red flags in a quote
A single combined price with no line items is the biggest warning sign. You cannot compare quotes if you cannot see what each component costs. A reputable installer will break out panels, inverter, mounting hardware, scaffolding, and labour separately.
Pressure to sign within 24–48 hours, vague warranty terms, and no MCS certificate number offered upfront are all reasons to walk away.
Getting a fair price
Get at least four quotes. The cheapest is rarely the best; the most expensive is rarely justified. Verify every installer's MCS number on mcscertified.com before they visit. MCS-certified work comes with a 10-year workmanship warranty and is a requirement for Smart Export Guarantee eligibility — there is no legitimate reason to use a non-MCS installer for a new residential system.