Solar Panel Repair Cost UK 2026
When a solar system underperforms, the inverter is the usual suspect — panels themselves rarely fail. In Q3 2026 a diagnostic call-out costs about £80–£150, replacing a string inverter £800–£2,000, and swapping a single failed panel £250–£500.
Solar Panel Repair Cost UK 2026 — Price Table
Typical UK prices for Q3 2026, supplied and fitted where relevant. Every quote varies with access, property type and region — London and the South East typically add 10–25%.
| Item | Typical cost | Notes |
|---|---|---|
| Diagnostic call-out | £80–£150 | Often credited against the repair |
| System health check | £100–£250 | Includes performance report |
| String inverter replacement | £800–£2,000 | Typical life 10–15 years |
| Micro-inverter / optimiser | £150–£400 each | |
| Single panel replacement | £250–£500 | Matching an older panel can be tricky |
| Isolator or wiring fault | £150–£450 | |
| Bird / pigeon proofing | £400–£900 | Mesh around the array |
| Panel removal and refit (roof work) | £500–£1,500 | For re-roofing or repairs |
| Monitoring reconnection | £80–£200 |
Indicative Q3 2026 UK market ranges. Confirm the figure for your job with a written quote.
What’s Included in a Solar Panel Repair Specialist Quote
- Attendance by an MCS-registered or qualified solar engineer
- Full string, voltage and insulation testing
- Inverter fault code diagnosis
- Replacement components with warranty
- Post-repair performance verification
- Re-commissioning of monitoring where fitted
Always get the scope in writing. Two quotes that look far apart on price are usually not quoting the same work — the difference is normally preparation, disposal or making good.
What Moves the Price Up or Down
Access and location
Restricted access, upper floors, scaffolding or limited parking all add labour time. Regional labour rates vary by 20–30% across the UK, with London and the South East highest.
Specification
Material grade is the biggest controllable variable. Moving one step up the range usually adds far less than people expect, because the labour stays the same.
Condition of what’s there now
Preparation and remedial work to existing fabric is the most common source of a quote coming back higher than the headline rate. A survey before quoting protects both sides.
Timing
Trades price emergency and out-of-hours work at a premium, and peak season is dearer for weather-dependent trades. Booking ahead is usually cheaper.
Solar Panel Repair Cost UK 2026 — FAQs
Panels typically carry a 25–30 year performance warranty and rarely fail outright. Inverters are the wear item — most string inverters last 10–15 years, so if your system was installed in the 2010s an inverter replacement is a normal, expected cost rather than a fault.
Check the inverter display or app for a fault code, then look for new shading (a grown tree is a common culprit), and check the panels for soiling or bird fouling. If the inverter shows no fault and the panels are clean, book a health check — a single failed optimiser can drag a whole string down.
Almost always. If the panels are sound, an inverter replacement at £800–£2,000 restores a system that generates £400–£900 of value a year. Full replacement only makes sense if the panels are damaged or the array is very small by modern standards.
Like-for-like repairs do not affect FiT payments. Increasing capacity can, so tell your FiT licensee before adding panels — and keep the paperwork for any inverter change, as they may ask for it.
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