Costs · 4 min read · Updated 6 November 2026
Is solar panel cleaning worth it? A UK cost and payback breakdown
What cleaning costs
In 2026, cleaning the panels on a typical UK house usually costs around £80 to £180, often worked out at about £4 to £15 per panel with a minimum charge. Larger and three-storey jobs cost more, and bird proofing is a separate, usually one-off, cost.
| Job | Typical UK guide price (2026) |
|---|---|
| 2 to 3 bed house, 8 to 14 panels | £80 to £150 |
| Large house, 16 to 25 panels | £150 to £250 |
| Heavy fouling or lichen add-on | Around £20 to £60 extra |
| Bird proofing, typical domestic array | £300 to £800 including a clean |
What your electricity is worth
The value of extra generation depends on whether you use it or export it.
| Electricity | Typical value per kWh (late 2026 guide) |
|---|---|
| Used in your home, avoiding grid import | Around 26p, based on the average price cap unit rate for October to December 2026 |
| Exported under the Smart Export Guarantee | Often roughly 3p to 15p depending on the tariff |
| Older Feed-in Tariff generation payments | Varies by registration date |
The Ofgem price cap unit rate averaged about 26.3p per kWh for electricity paid by direct debit from October to December 2026, and varies by region and tariff. Export rates vary widely between suppliers.
Worked example: a typical 4 kWp home
A 4 kWp system in the UK might produce around 3,600 kWh a year. Here is what different levels of soiling could cost, assuming half the electricity is used at home at 26p and half exported at 12p, which gives an average value of about 19p per kWh.
| Soiling loss | Electricity lost per year | Approximate value lost per year |
|---|---|---|
| 3 percent, light dust | About 110 kWh | About £20 |
| 5 percent, light grime and dirt line | About 180 kWh | About £34 |
| 10 percent, droppings and lichen | About 360 kWh | About £68 |
| 15 percent, heavy pigeon fouling | About 540 kWh | About £103 |
These figures are illustrations, not predictions. Actual losses depend on how the dirt is spread, the wiring of the panels and the weather.
When cleaning is likely to be worth it
- Heavy bird droppings or pigeon fouling, which can cause outsized losses through partial cell shading
- Lichen, moss or a thick dirt band on low-pitch or flat roof arrays
- Larger systems of 6 kWp or more, where the same percentage loss is worth more
- Homes using most of their solar electricity, such as those with batteries, heat pumps or electric cars
- Panels near farmland, trees, coasts or busy roads that soil quickly
- Cleaning before spring and summer, when most generation happens
When it may not be worth it yet
If your panels are on a steep, open roof, look reasonably clean from the ground and are generating in line with the installer's estimate and your previous years, the extra electricity from a clean may not cover the cost. In that case it is often better to wait, check generation each month and clean when you can see fouling or output dips. On the numbers above, a household paying £100 for a clean that recovers 3 percent of output would take around five years to get the money back in electricity alone.
Value beyond the electricity
The payback figure is not the only reason people clean. Removing lichen and moss before it spreads under frame edges, spotting cracked glass or loose cables during a visual check, and dealing with pigeons before they nest can prevent bigger and more expensive problems. Clean panels also look better, which some owners care about when selling a house. For commercial and farm arrays the sums are different again, because the same percentage loss across hundreds of panels is worth far more and per-panel cleaning prices are lower, so regular cleaning more often pays for itself.
Ways to cut the cost
- Ask about a regular maintenance plan, often a little cheaper per visit
- Combine solar cleaning with gutter clearing below the array if offered
- Ask neighbours with panels whether a cleaner can do several homes on the same day
- Fix pigeon problems once with proofing rather than paying for repeated cleans
- Time the clean for early spring to get the most from it
Before paying for any clean, check the panels are actually dirty. A quick look from an upstairs window or with a phone camera zoom often answers the question, and a month of generation figures compared with last year confirms it.
Frequently asked questions
How quickly do solar panels get dirty again after cleaning?
It depends on the location and roof pitch. Steep panels in open suburbs may stay reasonably clean for one to two years. Panels near trees, farmland, coasts or main roads, low-pitch arrays and roofs with pigeons can show noticeable soiling within months. Bird proofing and trimming nearby trees can slow it down.
Is it worth cleaning solar panels if I have a battery?
Often more so. A battery lets you store and use more of your own electricity in the evening, so each extra kWh is more likely to replace grid electricity at around 26p rather than being exported for less. That raises the value of any output lost to soiling, which can make cleaning pay back faster.
Can I estimate my own soiling loss?
Roughly. Compare your generation for a sunny month with the same month in previous years, or with a neighbour's similar system. If you are noticeably down when the weather was similar and you can see dirt, droppings or lichen, soiling is a likely cause. Checking output a few weeks after a clean also shows how much it helped.
payback electricity prices export tariff value
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