Properly sized and properly extended downspouts route gutter water 4+ feet from your foundation. Wrong sizing or short extensions = basement leaks and foundation damage.
Every downspout installation project KPro takes on starts with a free 24-hour drone inspection. We document everything before we touch a single shingle, fastener, or membrane — and you get those photos and the written assessment whether you proceed or not.
Our St. Louis customers have been telling us the same thing for 6 years strong: the difference is in the details. Three magnet sweeps for nails. Final drone inspection before sign-off. Two rounds of rain test for any roofing work. Owner on-site for every insurance adjuster meeting.
From Manchester to Chesterfield, Wildwood to Ballwin, Kirkwood to Town & Country — KPro has installed, repaired, and maintained downspout installation across every St. Louis suburb. Family-owned since 2020. 4.9 stars on 160+ verified reviews.
Most homes have downspouts. Most are wrong.
Sizing. 2x3 standard for small homes, 3x4 for larger. Undersized downspouts overflow during heavy rain.
Count. One downspout per ~30–35 linear feet of gutter. Long unbroken gutters need multiple downspouts.
Extension. Water must exit at least 4 feet from foundation. Splash blocks aren't enough — we install proper extensions.
Buried drainage. Tied into French drains or buried PVC for premium installs. Routes water 10–20 feet from house.
On-site within 24 hours. Drone aerial photos, ground walkthrough, written assessment. Free even if you don't proceed.
Itemized: materials, labor, warranty terms. No surprises, no hidden fees.
Materials delivered the morning of. Crew on-site at 7am. Most residential jobs finish in one day.
Three magnet sweeps for nails, final inspection together, you sign off. Manufacturer + KPro labor warranty on file.
KPro provides downspout installation services throughout the St. Louis metropolitan area and surrounding Missouri suburbs, plus Quincy, IL.
Common questions about downspout installation in the St. Louis area. Don't see yours? Call (636) 386-7499.
One per 30–35 linear feet of gutter. Most St. Louis homes have 4–8 total.
Minimum 4 feet. 6+ feet ideal. Buried PVC extensions can route 10–20 feet.
Color-matched aluminum downspout: $80–$150 per drop installed. Buried drainage: $400–$800 per drop with trenching.
If gutter water hitting the foundation is the cause: yes. We diagnose before promising — sometimes the issue is grading or window wells, not downspouts.
KPro provides downspout installation across the entire St. Louis metropolitan area including Manchester, Chesterfield, Wildwood, Ballwin, Kirkwood, Town & Country, Ellisville, Creve Coeur, Webster Groves, Wentzville, O'Fallon, St. Peters, Festus, and more — plus Quincy, IL on the Illinois side. Call (636) 386-7499 to confirm we serve your specific zip code.
Same-week scheduling for all standard estimates. Same-day response for active leaks or storm damage. We provide a written, itemized estimate within 24 hours of the on-site inspection.
No obligation. Real St. Louis roofers since 2020. Bilingual crew. Owner on every claim.
