Downspout Installation & Repair
Downspouts carry water from gutters away from your foundation. We install new downspouts, reroute existing ones, upgrade to oversized 3x4 profiles for high-flow areas, and add underground extensions to fix pooling, basement seepage, and foundation erosion across the Delaware Valley.
What downspouts do
Downspouts are the vertical pipes that take the water your gutters collect and carry it safely down and away from the house. If they're undersized, clogged, or dumping right against the foundation, all that roof water ends up in the wrong place — pooling in the yard or seeping into the basement.
We install and reroute downspouts, upgrade to oversized 3x4 profiles for high-flow roofs, and add above- or below-ground extensions that discharge water well clear of your foundation.
Standard vs oversized downspouts
| 2x3 Standard | 3x4 Oversized | |
|---|---|---|
| Capacity | Baseline | ~50% more water |
| Clogging | Frequent in tree-heavy areas | Resists clogs from leaves and twigs |
| Best for | One-story homes, light tree cover | Two-story homes, large roofs, heavy trees |
| Cost premium | Baseline | 10-15% more per foot |
Get water away from the foundation
Splash blocks
Cheapest fix. A concrete or plastic pad that spreads water 2 to 3 feet from the downspout. Works for low-flow situations on flat properties.
Aboveground extensions
Flexible or rigid pipe extending the downspout 6 to 10 feet across the yard. Effective but visible and easy to trip over.
Underground extensions
4-inch PVC pipe buried 10 to 24 inches deep, routed 8 to 15 feet from the foundation. Discharges into a dry well, pop-up emitter, or graded yard. Permanent fix for basement seepage.
Dry wells
Underground gravel pit that absorbs water gradually. Best for properties where water can't be routed to daylight or storm drains.
Typical downspout pricing
Standard 2x3 downspout (per run): $5 to $10 per linear foot, installed.
Oversized 3x4: 10-15% more.
Underground PVC extension: $15 to $30 per linear foot, typically $300 to $800 per downspout.
Downspout work across the Delaware Valley
Downspout FAQs
How many downspouts do I need?
The general rule is one downspout for every 30 to 40 feet of gutter, with at least one per gutter run. Larger roofs, steeper pitches, and heavier rainfall (like a wet South Jersey spring) call for more. Undersized downspout capacity is the most common cause of gutter overflow.
What size downspouts should I have?
Standard 2x3 downspouts handle most one-story homes with modest tree coverage. Oversized 3x4 downspouts move about 50% more water and clog far less often, which is why we recommend them for two-story homes, large roof areas, and properties with heavy tree debris.
How do I fix pooling under my downspouts?
Move the discharge point further from the foundation. Options include splash blocks (cheapest), aboveground extensions (flexible, ugly), or underground PVC piping routed 8 to 15 feet away from the house (best). We install all three depending on the property layout.
Are underground extensions worth it?
For homes with basement seepage or visible foundation erosion, yes. Underground extensions carry water 8 to 15 feet from the house before discharging into a dry well, daylight outlet, or graded yard. Installation runs $15 to $30 per linear foot in South Jersey, typically $300 to $800 per downspout.
Can downspouts cause basement leaks?
Yes, frequently. Water discharging right at the foundation soaks the soil, hits the basement wall, and finds the first crack or weak point. Fixing the downspout routing is one of the cheapest, highest-impact moves for stopping basement seepage. Often more effective than waterproofing the basement itself.
Fix the water at the source
Free written estimate. Most downspout work scheduled within a week.