For a commercial building, gutters are not a cosmetic detail. They protect the roof deck, the walls, the foundation, and everything inside from water that a large roof sheds fast. If you are planning commercial gutter installation in St. Louis, here is how sizing, cost, and the process actually work.
Sizing: bigger roofs need bigger systems
Homes usually run 5-inch or 6-inch K-style gutters. Commercial roofs move far more water, so they typically call for 6-inch, 7-inch, or 8-inch systems, and often box or fascia-style gutters built for high volume. The right size depends on your roof area, its pitch, and how many downspouts carry the load. Undersized gutters or too few downspouts are the most common reason a commercial system overflows, so getting the sizing right during design is where the value is won.
What commercial gutters cost
Commercial pricing spans a wide range because the systems do. Box gutter installation and replacement commonly run $12 to $75 per linear foot depending on size, material, and access. Multi-story buildings add cost, since scaffolding or lifts can raise labor by 25 to 50 percent. Material matters too: heavier-gauge aluminum, galvanized steel, and copper each carry different price points and lifespans. Because the variables are bigger, an on-site assessment is the only way to get an accurate figure.
What to expect from the process
A good commercial installation starts with an inspection and a drainage plan, not just a measurement. We look at roof area, existing downspout placement, and any spots where water is already causing stains or pooling. From there we size the system, fabricate it, and install with the bracket spacing and slope needed to carry heavy loads for years. Winter is part of the plan too, since snow and ice add weight; our guide to gutters for heavy snow and ice covers what that means for your building.
Protecting your investment
Failing gutters cost far more than they appear to, in water damage, stained facades, and unhappy tenants. When a system is mostly sound, gutter repair can extend its life. When it is not, a right-sized replacement pays for itself. Curious how residential numbers compare? See our St. Louis gutter replacement cost guide.
GutterPros has served St. Louis businesses since 2002. Request a free commercial gutter inspection and we will size and price the right system for your property.