A gutter can be scooped perfectly clean and still overflow in the next storm if the downspout is plugged. That is why downspouts cause a lot of callbacks in gutter cleaning. The customer sees water pouring over the edge, assumes you did a bad job, and calls. Flushing every downspout as part of the job, and showing the customer that the water runs free, prevents most of those calls and gives you an easy add-on to sell. This post covers how downspouts clog, how to test and clear them, what to do about underground drains, how to price the work, and how to record it so the customer can see it was done.
Where downspouts clog
Most downspout clogs happen in a few predictable spots. The outlet at the top, where the gutter drains into the downspout, catches leaves and twigs. The elbows, where the downspout bends back toward the wall at the top and again near the ground, are the most common trouble spots, because debris piles up at each bend. The bottom elbow or extension, where the downspout empties onto the ground or into a drain, collects mud and roof grit.
Downspouts that run into underground drain pipes are a separate case. The downspout itself may be clear, but the buried pipe can be packed with silt, roots or crushed sections, and that is a different job from gutter cleaning.
Knowing where clogs form tells you where to look first and what to tell the customer.
How to test and clear them
The simplest test is water. After the gutter is clean, run a hose into the gutter near the outlet, or straight down the downspout from the top, and watch the bottom. If water comes out strong and steady, the downspout is clear. If it backs up into the gutter or only trickles out, there is a clog.
Start with the easy fixes. Clear the outlet by hand. Pull off the bottom extension or elbow and flush from below. Many clogs at the bottom elbow come free once the extension is off.
For clogs in the middle, run a hose down from the top with a nozzle, or use a plumber's snake to break up the blockage. Some crews carry a small pressure nozzle made for drain lines. Avoid hammering on the downspout to knock debris loose; it dents the aluminum and can pull the downspout away from the wall.
If a section is crushed or a clog will not come loose, it may be faster to take the downspout apart at the joints and clear each piece. Reassemble it with new screws if the old holes are stripped.
Underground drains: know where to stop
Many houses route downspouts into buried pipes that carry water away from the foundation. When those pipes clog, water backs up the downspout and overflows the gutter even after a perfect cleaning.
You can test them the same way: disconnect the downspout at ground level, run a hose into the drain pipe, and see whether water comes out at the far end (often a pop-up emitter in the yard or an outlet at the curb). If water backs up or never appears, the pipe is blocked.
Decide in advance how far your crew will go. Flushing a short underground line with a hose or a small drain snake is reasonable for many crews. A pipe full of roots, a collapsed line, or a drain that ties into the storm sewer is usually a job for a drainage contractor or a plumber. Tell the customer what you found, note it on the property, and either quote the repair separately or refer it out. Never let underground drain work turn into free labor on a gutter ticket.
Included or itemized?
There are two common ways to price downspout work, and both work as long as you are clear about it.
Including flushing in every cleaning makes your service stand out and avoids arguments at the door. Your base price has to account for it. If your average house has four to six downspouts, that is real time, so build it into your per-foot rate or your minimum.
Charging per downspout keeps your base price lower on the estimate, which can help when customers are comparing quotes. The risk is that customers assume it is included and are surprised by the extra line. If you itemize, put it on the estimate clearly: "Flush and test 5 downspouts."
Either way, price clogged underground drains separately. A note like "Underground drain at back left corner backs up; repair quoted separately" keeps that work from creeping into the cleaning price. For the rest of the price sheet, see the pricing guide.
Show the customer the water runs free
Downspout work is even more invisible than gutter cleaning, because the clog was inside a pipe. The customer has no way to know it was there unless you show them.
A short note and a photo are enough. A photo of the debris pulled from the bottom elbow, or of water running strong out of the extension, tells the story. In IndustryBossPro, the crew adds photos and notes to the job from the crew app, and the customer gets them in the completed alert when the job is marked done.
The crew's notes also matter for next time. "Back right downspout clogs at the lower elbow every fall" or "Front drain line is slow, customer aware" go into the property notes and show up for the crew on the next visit. That history is what lets you tell a customer, honestly, that a gutter guard or a drain repair would save them money.
Turning downspout problems into planned work
Some houses clog the same downspout every season. That is useful information. It may mean a larger downspout would help, an extra outlet on a long run, a guard on the gutter section that feeds it, or a repair on the underground line.
Treat those findings as leads, not as complaints. When the crew notes a repeat problem, the office can follow up with an estimate for the fix. Put it on the property so it does not get lost, and send the estimate while the customer still remembers the overflow. If the fix is guards, the gutter guard post covers how to quote them from the footage you already have.
Done this way, downspout flushing is more than an add-on. It is the part of the job that heads off callbacks, shows the customer real value, and points you to the next piece of work on the house.
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