Reviewed November 3, 2026. Gutter Installation St. Louis is a referral service; independent contractors do the work.
Seamless gutters are formed on site by a machine that turns a coil of painted metal into one continuous length for each run. With no joints along the straight, there are fewer places for leaks to start, which matters where water freezes and thaws in the trough. Corners, end caps and outlets are still joined and sealed, so workmanship counts.
- Made
- On site from a coil, cut to each run
- Usual metal
- Painted aluminum. Steel and copper exist too.
- Joints
- Only at corners, end caps and outlets
- Worth asking
- Metal thickness, and whether the machine comes to your house
How seamless differs from sectional
Sectional gutters come in fixed lengths, joined with connectors every few feet. Every joint relies on sealant, and sealant has a hard time on a metal trough that moves with each cold snap. A seamless run replaces those joints with one piece.
| Seamless | Sectional | |
|---|---|---|
| Joints on straight runs | None | One every section |
| Who installs | Contractor with a forming machine | Contractor or a handy owner |
| Repair | Replace the run or patch it | Swap a section |
| Best fit | Most whole-house jobs | Sheds, short repairs, matching an old profile |
Why the machine matters in an alley
Many older St. Louis houses have alley access and tight gangways. A forming machine sits on a van or trailer, and long lengths have to be carried to the wall in one piece. On a row of closely set brick houses, that can be the awkward part of the job. Mention narrow side yards in your request, because a long run may need planning or a joint where it can't be carried in.
Metal and thickness
Aluminum doesn't rust and takes factory paint, which is why it's the common choice. Thickness is the number to compare between quotes, since thin metal dents and sags under ice and ladders more easily. Ask what gauge is being quoted, and make sure it's written down. Steel is tougher but can rust once its coating is scratched. Copper is a different choice, often made for looks on historic houses.
Where seamless doesn't solve it
- It can't fix a rotten fascia. That comes first.
- It doesn't replace a built-in box gutter without changing how the eave looks.
- Inside a City Historic District, a modern K-style profile may raise questions. Ask first.
- Long runs still need room to expand. Ask how a long run is hung and where the outlets go.
What to ask the contractor
- What gauge and which coil?Get the thickness in writing, so two quotes compare like with like.
- Will the runs be made here?Ask if the machine comes to the house, and how it will reach the back.
- Where will the joints be?Ask them to mark corners and outlets, and to say how they seal them.
- How is the run hung?Ask for hanger type and spacing, and the planned fall to each outlet.
Seamless gutters around St. Louis
See what's different about each place.
City of St. Louis
- Soulard
- Lafayette Square
- Benton Park
- Tower Grove South
- Shaw
- Central West End
- The Hill
- Dogtown
- St. Louis Hills
- Carondelet
St. Louis County
- Clayton
- University City
- Webster Groves
- Kirkwood
- Maplewood
- Ladue
- Creve Coeur
- Chesterfield
- Ballwin
- Affton
- Oakville
- Florissant
St. Charles County
Seamless gutters: questions
Are seamless gutters truly without seams?
Only along the straight runs. Corners, end caps and downspout outlets are still joined and sealed. Those joints are where to look first if a leak appears, so ask how they will be made.
Can I add seamless gutters to just one side?
Yes, a contractor can replace a single run. Matching the profile and color of the rest of the house can be the catch, since old paint fades. Ask to see a sample against the existing gutter.
Do seamless gutters handle freeze and thaw better?
They have fewer joints to work loose, which helps. But pitch, outlets and clean troughs matter as much. A clogged seamless gutter still fills with ice. See ice dams and freeze and thaw.
Are they worth it over sectional?
For most whole-house jobs, many owners think so. For a shed, a short patch or matching an old profile, sectional can make sense. Ask for both prices if you're unsure.
Further reading
- What do new gutters cost in St. Louis, and how do you read a quote?
- What size gutter does a St. Louis roof need?
Related work
- Gutter Installation: New gutters and downspouts for brick city houses, postwar ranches and newer subdivisions, planned around freeze and thaw and heavy spring rain.
- Gutter Replacement: Taking the old system off and starting again, including whatever the removal uncovers underneath.
- Gutter Guards: Covers that keep most leaves and seeds out of the trough. They cut the work, but they don't end it.