A downspout is easy to forget until a roof crew unbolts it. On a Creve Coeur lot, the question is often not whether the water leaves the gutter but where it lands after it does. If the downspout drains onto the neighbor's side of the lot line, the roofing job is the moment to fix it, because the crew will have to take the old run apart and put it back somewhere. The new route is part of the roof work, and it should be written down before the first nail.
Why the lot line shows up at tear-off
During a tear-off, the crew removes the gutter sections and downspouts along the eave, strips the old shingles, and reinstalls the metal once the new roof is on. Before they touch the metal, they have to know where each downspout ends. A downspout that runs to a splash block, a buried leader, or an extension that stops well inside your own yard gives the crew a simple path. A downspout that ends at the property line, or that sends water across it, is a different problem. Moving the outlet changes where the roof water sits in the yard for years, and the neighbor will notice it before you do.
The drainage of your lot is not always obvious from the driveway. Lots in older parts of Creve Coeur can fall toward a side yard, toward a shared swale, or toward a low corner that holds water after a heavy rain. A roof can drain correctly on paper and still send most of its water into one corner of the property. Walk the side yard after the next rain and look at where the water stands. That is the place the downspout route has to respect.
What the crew takes apart
On most roof jobs, the downspouts come down in sections. Elbows, straps, and extensions are removed so the crew can reach the fascia and the roof edge. The gutter itself may stay on or come off, depending on the fascia and the siding. When the job is done, the downspouts go back up and the extensions go back down. Nothing in that sequence says where the water should end up. That decision has to be made beforehand, and the people doing the work have to be told which version to build.
There are three common outcomes. The first is that the old discharge is restored as it was, including the same bend that sends water across the line. The second is that the discharge is lengthened so the water reaches a point well inside the yard, or to a splash block set on ground that drains. The third is that the downspout is connected to a buried line that runs to a daylight outlet on your own lot. Each option has a different cost and a different amount of digging, and only the homeowner can choose which one fits the yard.
What to ask for in writing
Ask each roofer to name the discharge point for every downspout on the house. A line that says "reconnect downspouts" is not enough. The scope should say where each one ends after the work, what the extension material is, and whether a splash block or buried line is included. If the new outlet is a buried line, the scope should name the pipe, the slope it will be laid at, and where it daylights. If the outlet sits on the surface, the scope should say how far from the foundation it stops.
Ask about the lot line directly. If any downspout currently discharges across the property line, the scope should say whether that run is being moved, and it should say so in plain words. A roofer who says the old run "will stay as is" has agreed to keep a problem in place. A roofer who says the run "will be relocated" needs to show where it goes. A written scope with photographs and measurements of each downspout run gives you a record to check against once the crew leaves.
Ask whether the downspout work is priced as its own line. Extensions, elbows, and buried pipe are often small in the total, but they are easy to leave out of a bid, and they are the parts that show up later when the next rain arrives. A separate line lets you compare two bids on the same downspout route rather than guess which one included it.
When the neighbor is involved
If water from your downspout has been crossing into the neighbor's yard for years, a route change may be something you want to talk through with them before the crew arrives. The roofing contractor handles the roof and the gutters on your side of the line. A conversation with the neighbor about a new outlet is a property matter you can settle with them directly, and it is worth doing before the crew stages materials in the side yard. Where the new outlet sits also affects where the crew can walk and where the dumpster or material pile can go, which is one more reason to decide early.
Check the route yourself before the crew arrives
Before anyone signs, go outside with a hose or wait for a steady rain. Watch each downspout discharge and follow the water with your eyes. Note where it sheets across the grass, where it pools, and where it reaches the property line. Take photos from gutter level and from the ground. These photos are a useful baseline, and they show the roofer exactly which outlets matter to you.
Then compare what you saw with the roofer's written scope. If a downspout drains across the line today and the scope does not mention it, ask for a revision before the start date is set. If the scope names a new outlet, check that it sits on your own lot, away from the neighbor's grade. If you are not sure what the neighbor's grade looks like, a short walk along the property line will settle most of the question.
Keys documents the existing downspout runs with photos and measurements, and puts a written scope with those photos in your hands before the work starts. If you want to talk through a particular outlet before you choose a roofer, call the office at (314) 220-2333. The conversation is easier when you have the photos and the current discharge points in front of you.