You hear it before you see it. A low cooing from the roof in the early morning, a scrabble of feet above the bedroom, a fresh streak of white down the side of the house.
If you have rooftop solar in the Denver metro, pigeons are the wildlife problem most likely to find you. This article covers how to tell whether they have moved in, what they do to your array, and who should close the gap.
How common is this in Denver?
Common enough that it is the first thing we look for under a rooftop array. Skedaddle Wildlife Control says that pigeons are by far the most frequent solar panel wildlife issue in the Denver area.
That matches what you would expect from the layout of most rooftop systems. A panel sits a few inches above the shingles on its racking. That gap is shaded, dry, out of the wind and hidden from hawks. To a pigeon, it is a ready-made porch with a roof.
Why do pigeons pick solar panels?
Because the gap under a panel gives them almost everything they want in one place:
- Shelter. The panel keeps rain, hail and snow off the nest.
- Warmth. The roof deck and the back of the module hold heat into the evening.
- Cover. Predators cannot see in from above or reach in easily.
- A flat floor. Shingles under the racking make an easy base for twigs.
Once one pair settles in, others often follow. Pigeons return to the same nest site and raise more than one brood a year, so a single nest in spring can turn into a busy colony by late summer.
What are the signs from the ground?
You can usually confirm pigeons without climbing anything. Look for:
- Birds flying in and out low. Pigeons that land on the roof edge and then disappear under the array are nesting, not resting.
- Twigs at the panel edge. Small sticks, grass or feathers poking out from under the lowest row.
- Droppings below the array. Streaks on the gutter, the siding, the patio or the walk.
- Droppings on the glass. White spots on the panels themselves, often clustered near the edges.
- Noise at dawn. Cooing and movement right under the roof line, most mornings.
A pair of binoculars from across the street helps. Look at the bottom row and the corners, where the gap is widest and easiest to enter.
What do pigeons do to your array?
Three things, and only one of them shows up quickly in your numbers.
Droppings on the glass. A bird dropping on a panel casts a small, hard shadow on the cells beneath it. Unlike dust, it does not let light through. Our page on bird droppings on solar panels explains why one spot can pull down more of a panel than its size suggests.
Nest material underneath. Twigs, feathers and droppings pile up around the racking, the roof mounts and the wiring. That pile holds moisture against the shingles and sits against cables that were never meant to live in a nest.
Constant traffic. Birds walk the edges, perch on the frames and come and go all day. Over time, that adds up to more mess on the glass and more debris below.
Can pigeons damage the wiring?
They can, though how much is not something anyone should guess from the ground. Nesting material can pack around connectors and cables, birds can pull at loose wires, and droppings are corrosive over time.
Whether any of that has done harm is a question for your installer or a licensed electrician. We look, we photograph what we can see, and we write it down plainly. We do not open junction boxes, test circuits or move wiring, and nobody on our crew should.
Will it hurt my production?
Possibly, and your own data is the honest way to find out. Droppings on several panels can show up as a slow slide on clear days. If you have panel-level data from microinverters or optimizers, one module that runs consistently low while its neighbors are fine is a strong hint.
Our guide to reading your solar app shows how to compare clear days and spot a single weak panel. If the numbers look normal, the nest may still be worth dealing with before it grows, but it is not an emergency.
What should you not do?
Most homeowners want the birds gone the same afternoon. Please do not:
- Climb onto the roof to pull out nests. Pitched roofs, loose debris and a startled bird are a bad mix.
- Reach under the panels. There is wiring under there, and sharp racking edges.
- Hose the gap. Water pushes droppings deeper and soaks the roof deck.
- Attach mesh or spikes yourself. Drilling or clamping onto racking can affect your installer’s warranty and your roof.
- Assume every bird is a pigeon. Sparrows, finches and starlings use the same gap, and the rules for disturbing nests differ by species.
That last point is a good reason to hand removal to someone who does it for a living.
Who closes the gap?
Usually your installer or a wildlife specialist. The common fix is a guard around the perimeter of the array that keeps birds out from underneath. It needs to attach without drilling into the modules, and it needs to go on after the nests and debris are cleared out.
Your installer knows the racking and can tell you what is safe for your warranty. A wildlife specialist knows the birds, the timing and the rules around active nests. Some installers work with a wildlife company directly.
We do not install critter guards ourselves. We document nests, droppings and debris, and we recommend who to call.
What do we do on a pigeon roof?
On a roof with pigeons, the four-pass visit focuses on what you cannot see from the yard:
- Read. We pull 30 days of production before we arrive, so we know whether droppings are already costing output.
- Look. A glass-level look at every module, with photos of the gap under each edge, any nests, and anything touching the wiring.
- Rinse. Droppings lifted by hand with microfiber and pure water, then the whole array washed with soft brushes.
- Prove. Photos of the glass and the gap, plain notes, and a production comparison from the next clear days.
You can read the full inspection side of this on our visual solar inspection page. If birds have already settled in, our page on pigeons nesting under panels covers the season, the signs and the next steps in short form.
When is the best time to deal with it?
Before nesting season gets going, if you can. Pigeons in the Denver area are busiest in spring and summer, though they can nest for much of the year. Closing the gap in early spring is easier than clearing an established colony in August.
If you are on a plan with a spring check, that visit is the natural time to look. The year-round care plan includes a spring inspection report with photos of the gap, which gives your installer or wildlife specialist exactly what they need to quote.
What happens after the guard goes on?
Expect a few weeks of birds landing on the roof edge and looking confused. They usually give up and move on.
After that, the glass stays cleaner and the gap stays empty. A wash after the guard is installed clears the last of the droppings, and a look at the edges at your next visit confirms nothing has worked loose.
The short version
- Pigeons are the most common solar wildlife issue in Denver, and the gap under the panels is why.
- Watch for birds disappearing under the array, twigs at the edge and droppings below.
- Droppings cost output; nests are a wiring and roof question for your installer.
- Do not climb, reach in or attach anything yourself.
- Close the gap early in the season, then wash.
If you think birds have moved in, a photo report is the simplest start. You can book a visit and we will send back pictures of the gap, the glass and anything your installer should see.