It starts simply enough—a puddle of standing water near your downspout after heavy rains. This might seem like no big deal, but without a way to effectively extend drainage away from your home, leaks, basement flooding, foundation cracks, and all sorts of moisture-related issues loom around the corner.

The answer? Install an underground gutter drainage system.

Just like that, your problems are solved! Well, almost… Now comes the big question: How much does it cost to install underground gutter drainage?
In this blog post, we’ll break down all the factors that go into the cost of underground drainage system installation so you can make an informed decision about this valuable investment.

The Basics of Downspouts and Underground Drainage

Traditional gutter systems use above-ground downspouts to carry rainwater from the roof’s edge down to drain outlets near the home’s foundation. While functional, this setup can lead to a host of problems like soil erosion, foundation settling or cracking, and water pooling around the home’s perimeter.

Underground drainage systems solve these issues by extending the downspouts into underground pipes that route water away from the home’s foundation to a safe discharge point like a storm drain or dry well.

This protects your home’s structural integrity and prevents drainage problems like flooded basements or soggy yards, offering an easy solution for managing rainwater runoff and keeping moisture issues at bay.

Advantages of Underground Downspout Extensions

  • Improved Aesthetics: Exposed downspouts are unsightly and can be an eyesore, especially with temporary extensions snaking across your yard. Underground drainage systems neatly tuck the drainage pipes out of sight for a clean, polished look.
  • Prevent Soil Erosion and Water Damage: When downspouts discharge too close to the home, the concentrated flow of water can erode soil and allow moisture to seep into basements or crawlspaces over time. Underground pipes safely redirect this water much further away.
  • Reduce Basement Flooding Risk: For homes with basements or crawlspaces, underground drainage is key for preventing water intrusion that can lead to mold, mildew, and structural damage.
  • Longer Discharge Distance: Underground pipes can route water up to 100 feet or more away from your home’s foundation compared to just 10-20 feet for typical above-ground extensions.

With fewer exposed components, an underground drainage system is also less susceptible to damage from lawn equipment, clogs from debris, or freezing temperatures over time.

Factors Impacting Underground Drainage Costs

Material Type

The type of piping material used for underground drainage system installation can significantly impact costs. Here are some average costs per linear foot:

  • PVC pipe: $3-$6 per foot
  • Rigid plastic pipe: $4-$8 per foot
  • Corrugated plastic pipe: $2-$5 per foot

While more expensive, PVC and rigid plastic pipes tend to be more durable than corrugated plastic. The pipe diameter needed (typically 3-6 inches) will also affect your overall costs.

Average cost for underground gutter drainage per material type/home size.

Size of Your Home

Larger homes require longer pipe runs from more downspout locations, which brings higher material and labor costs. The layout and elevation changes of your property (hills, several stories) can add complexities and increase costs as well. A typical single-story home might need 50-100 linear feet of piping, while a large multi-story home could require 200 feet or more.

System Add-Ons

Basic underground drainage systems route water away via underground pipes, with average installed costs of $20-$50 per linear foot. Upgrades like a dry well/french drain ($1,000-$5,000), a sump pump ($500-$1,500), and downspout extensions ($10-$25 per downspout extension) can enhance performance.

It’s important to note that French drains are trenches filled with gravel that allow water to slowly absorb into the ground, while regular downspout extensions simply move the discharge point further from the home.

Landscaping Work

Most homeowners hire professionals for excavation, repaving walkways, installing drain grates, and landscape restoration after an underground system is installed. Excavation rates range from $50-$100+ per hour, depending on the company and location. Restoring landscaping (like replanting sod) can add $500-$2,000 to the total project cost.

What You Can Expect to Pay for Drainage Installation

Underground downspout drainage systems are a great long-term solution for managing excess water flow and protecting your home’s foundation. After factoring in materials and labor, most homeowners can expect to pay between $2,000 and $6,000 on average for a basic underground drainage installation on a typical single-family home.

However, costs rise based on the home’s size, drain run length, system add-ons like dry wells or sump pumps, landscaping work required, and other factors outlined above. For example, a more complex system for a large multi-story home could range from $10,000 to $20,000 or more.

To get project-specific pricing, it’s best to obtain quotes from 2-3 gutter installation contractors who can evaluate your home’s unique situation.

Get Your Free Quote Today!

While the cost of installing an underground drainage system can seem daunting, it’s a wise investment that pays off by preventing costly water damage issues down the road. That’s where Aerotech comes in. We specialize in installing underground drainage systems that are robust, reliable, and built to last using top-quality materials and workmanship. From basic downspout extensions to a comprehensive French drain setup, we have a solution to fit any home and budget—reach out today for a free, no-obligation estimate!