Placement and sizing so water actually moves away from your foundation — not just off the roof.
Gutters only do half the job — downspouts are what actually carry water away from your home instead of letting it drop straight down next to the foundation. In Allen's clay-heavy soil, water that isn't routed away can pool and contribute to slow foundation movement over time, which makes correct downspout placement one of the more consequential details in a gutter system.
A long or steeply pitched roof section may need two downspouts instead of one — sizing per run, not a flat "one per corner" rule, is what actually keeps a system from overflowing during a heavy Collin County storm.
Downspout size needs to match the volume of water the connected gutter run can collect. An undersized downspout backs water up in the gutter above it even if the gutter itself is in good shape — which is a common, often misdiagnosed cause of overflow that looks like a repair issue but is really a sizing issue.
Downspout extensions or splash blocks carry water the last few feet away from the foundation, out toward a yard, drain, or lower grade point. This is especially worth getting right on residential lots with tight side yards where water has few places to go on its own.
Downspout work often comes up alongside a new installation, but it can also be a standalone project — adding a downspout to a run that's clearly overflowing, or relocating one that's currently dumping water somewhere it shouldn't.
Number of downspouts, length (based on roof height), material to match your existing or new gutters, and any extensions or underground drainage tie-ins are the main factors in a downspout estimate.
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