Solar Panel Costs UK 2026: Real Prices, No Sales Spin

A standard 4 kWp residential solar PV system, fully installed and MCS-certified, costs £6,500-£8,500 across the South East. A 6 kWp system runs £8,500-£11,500. A 6 kWp system paired with a 10 kWh battery typically lands £12,500-£15,500.

Premium-brand specifications (SolarEdge optimisers, Enphase microinverters, Tesla Powerwall 3, full-black in-roof integrated panels) add 20-40% to those headline figures.

A reputable install price should always include: MCS-listed panels and inverter, structural roof check, scaffolding, full DC and AC wiring, DNO notification (G98 / G99), MCS and IET electrical certificates, your RECC consumer protection paperwork, and a workmanship warranty (typically 12 years).

Things to watch for: anything described as 'from £X' without specifying panel count and warranty length, or quotes that omit scaffolding or DNO costs.

On a typical £10,000 mid-spec install, panels and mounting are around 35-40% of the cost, the inverter 10-15%, the battery (if included) 25-35%, scaffolding 5-8%, labour and electricals 12-18%, and certification, DNO and admin 3-5%. Knowing the breakdown helps you spot quotes that load the price on hardware and skimp on labour, or vice versa.

Battery capacity is the single biggest swing factor. Going from 5 kWh to 15 kWh on the same solar size typically adds £3,500-£5,500 to the total — but lifts annual savings by £300-£500, so the additional payback is similar to the base system.

Three factors drive 80% of the spread between quotes: panel and inverter brand choice (a Tier-1 Korean or European panel costs 15-25% more than a Tier-1 Chinese equivalent), roof complexity (single-pitch tile is the cheapest scenario; multiple aspects, in-roof integration or slate add real labour cost), and scaffolding requirements (2-storey terraced row vs detached with three-storey gable can double the scaffold spend).

Anything more than ~25% cheaper than mid-range competitor quotes is almost always cutting corners on inverter brand, workmanship warranty length or installer accreditation. Anything more than 30% more expensive usually reflects premium aesthetics or oversized batteries, not better hardware.

Bird-proofing mesh on a new install (£200-£400 is reasonable, more is markup), generic 'monitoring software' fees (every reputable inverter has a free app), 'extended performance warranties' on top of the standard 25-year panel cover (usually unnecessary), and bolt-on insurance products from the installer rather than your home insurer (almost always more expensive than just informing your existing insurer).

Consumer-unit upgrades on older homes (£250-£500), DNO export limitation devices for systems over 16 A per phase on single-phase supplies (£150-£300 fitted), and roof rework where existing tiles are brittle or batten lines have rotted (£400-£1,200 typical). A good surveyor flags these before contract; a poor one tacks them on as 'extras' during the install.

Panel and battery hardware prices have been falling year-on-year since 2010 and continue to fall, albeit more slowly. Labour, scaffolding and installer overheads have risen with inflation, partly offsetting hardware deflation. Net effect: total installed prices have been broadly flat for three years and are likely to stay flat through 2026 before resuming a gentle downward trend. There is no economic case for waiting unless you're specifically waiting on a new battery or panel product release.