If you search for what solar panel cleaning costs in Denver, you will find a lot of ranges and very few actual prices. Directory sites tend to show wide spreads, and it is hard to tell what any of them include.

So here are ours, in full. These are indicative prices for our crew in the Denver metro and the Front Range foothills, with worked examples by panel count and the things that move the number up or down. We will also tell you when a wash is not worth paying for at all.

What does a single wash cost?

A single rooftop wash starts from $149 for up to 20 panels, then $5 for each panel over 20.

That one price includes:

  • The four-pass visit: reading your data, the walk-around, the wash and the follow-up
  • Pure water we bring on the truck, filtered to near zero dissolved solids
  • Soft brushes and hand work on droppings and sap
  • A glass-level check of every module, at no extra cost
  • Before and after photos
  • A production comparison from the next clear days
  • Travel anywhere inside our service area

Our single wash page lists what is in the visit step by step.

What does that look like by panel count?

Here are a few worked examples on a typical single-story or easy two-story roof:

  • 14 panels: from $149
  • 20 panels: from $149
  • 24 panels: from $169 ($149 plus 4 × $5)
  • 30 panels: from $199 ($149 plus 10 × $5)
  • 36 panels: from $229 ($149 plus 16 × $5)
  • 40 panels: from $249 ($149 plus 20 × $5)

A typical Front Range home array has 15 to 40 panels, so most single washes land between $149 and $249 before any roof adjustments.

What changes the price?

Only a few things, and we tell you which ones apply before we book.

  • Panel count. The biggest factor, as above.
  • Roof height and pitch. Taller two-story roofs, third stories and steep pitches can add $25 to $50, because they take more setup and harness time.
  • Ground mounts. The same price as a rooftop, but $20 less when no ladder is needed. A 20-panel ground mount starts from $129.
  • Travel beyond our area. Inside the service area, travel is included. Farther along the Front Range, we quote travel separately.

That is the list. We confirm the price from a photo or a satellite view of your array before the visit, so you know the price before we arrive.

What is not part of a wash?

A few things people sometimes expect, and that we do not do at any price:

  • Snow removal. We never rake or clear snow from rooftop arrays. The sun does it better and safer.
  • Critter guards. We document nests and droppings, then recommend your installer or a wildlife specialist.
  • Electrical work. No opening junction boxes, no rewiring, no testing. That goes to your installer or a licensed electrician.
  • Roof repairs. If we see a lifted shingle near a mount, we photograph it and suggest a roofer.
  • Promised gains. We never quote a percentage increase. You see the result in your own numbers.

Knowing the limits up front makes it easier to compare what you are actually paying for.

Is a plan cheaper than single washes?

Usually, if you would wash more than once a year.

Two-season plan, from $259 a year. Two washes a year for up to 20 panels, timed for late June and September. Two single washes would be $298, so the plan saves a little and books both visits for you. Larger arrays add $5 a panel per visit over 20. See the two-season cleaning plan.

Year-round care, from $389 a year. Two washes, a spring inspection report and monitoring of your production data. Bought separately, two washes ($298), a visual inspection ($129) and a year of output watch ($129) would come to $556. See year-round care.

There are no contracts on residential plans. You can cancel any time before the next visit.

What do inspections and monitoring cost?

If you want a look or a watch without a wash:

  • Visual inspection with photo report: from $129
  • Storm check after hail: from $119
  • Home sale solar report: from $199
  • Output watch (monitoring): from $12 a month, or $129 a year

Commercial roofs are priced differently, under a commercial care contract from $9 per kW a year. Our pricing page has the full list in one place.

Why do other quotes vary so much?

We cannot speak for anyone else’s pricing, and we will not try. In general, directory sites show wide ranges because they mix very different services under one label.

When you compare quotes, it helps to ask the same questions of each:

  • What water do you use? Tap water through a hose can leave mineral spots.
  • Do you use soap, a pressure washer or a squeegee? Your panel manual may say no to all three.
  • Does anyone walk on the panels? They should not.
  • Is an inspection included? Or is that extra?
  • What do I get afterwards? Photos, notes, a production comparison, or nothing.
  • What adds to the price? Ask for the full list before booking.

A lower price for a hose-and-soap job is not the same service, and a higher price is not automatically a better one.

Is a wash worth it for your roof?

Sometimes it is not, and we would rather say so. A clean panel is only worth paying for if you can see it in your own production numbers.

For context, an NREL-led mapping study reported soiling energy losses of up to 7% at U.S. sites. That is a ceiling seen across many locations, not a number for your roof. A steep roof that gets good rain may lose far less. A low-pitch roof by a gravel road may lose more.

The output check lets you put in your system size and recent production to see what a small soiling loss is worth in a year. If that number is smaller than the cost of a wash, wait. If it is close or larger, a wash makes sense.

Could you do it yourself instead?

For some arrays, yes. Ground mounts, carports and low single-story roofs can often be washed safely from the ground with a soft brush and a gentle hose. Our clean it yourself guide covers the tools, the timing and what the manuals ask for.

If the roof is two stories or steep, the ladder is the expensive part, and that is where a crew of two with harnesses earns its price.

What should you have ready for a quote?

To confirm a price quickly, send us:

  1. Your address. So we can check the satellite view and travel.
  2. A rough panel count. Or a photo of the array.
  3. The roof height. One story, two stories or more.
  4. Anything unusual. Birds, trees overhead, tight side yards, a gate code.

We reply within one business day. Our solar panel cleaning service page shows exactly what happens on the morning.

The short version

  • A single wash starts from $149 for up to 20 panels, plus $5 a panel over 20.
  • Tall or steep roofs can add $25 to $50; ground mounts are $20 less without a ladder.
  • The two-season plan starts from $259 a year; year-round care from $389.
  • Inspections, storm checks and monitoring are priced separately.
  • All prices are indicative and confirmed from a photo before we book.
  • If the output check says a wash will not pay, wait.

If the numbers make sense for your roof, you can book a wash and we will confirm the price from a photo before we set a morning.