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A worker preparing a gutter downspout for an underground drainage connection

Gutter Downspout Extensions

Move roof runoff away from your foundation. Underground downspout extensions connect your gutters to a planned discharge point, helping reduce water pooling beside your home.

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A debris-screen connection between a gutter downspout and underground pipe

A leaf-guard connection helps keep larger debris out of the buried line.

Where Does the Water From Your Roof Go?

A downspout that ends beside the house can leave roof runoff close to the foundation. An underground extension connects that downspout to buried drainage pipe and carries the water to a suitable outlet farther from the home.

Crawl Space Brothers plans the connection, underground route, and discharge together. We consider the property’s slope, access, existing drainage, and surfaces that may need to be opened and restored.

Signs Roof Runoff Is Collecting in the Wrong Place

Look at what happens near your downspouts when it rains. The water’s route can help explain recurring dampness and erosion.

  • Puddles beside the foundation
  • Washed-out mulch or soil
  • Water returning near the basement or crawl space
Schedule a free inspection

Downspouts empty directly beside the house

A short discharge route can concentrate roof water close to the foundation. We assess where the water goes and whether a buried extension would provide a better route.

Pooling after rain

Water that remains near a downspout may reflect an outlet or grading problem. The inspection considers both the roof runoff and the surrounding ground conditions.

Erosion or waterlogged landscaping

Concentrated runoff can wash away soil or mulch and leave planting areas saturated. The outlet location matters as much as the pipe that carries the water.

Basement or crawl space dampness after storms

Roof runoff may contribute to water around the foundation, but it is not the only possible source. We explain when interior waterproofing or another repair is also needed.

From the Downspout to the Discharge Point

A buried extension needs more than pipe in the ground. We plan for access, utilities, debris control, the outlet, and any restoration included in the work.

A worker cutting a downspout to prepare the underground drainage connection
The existing downspout is prepared for the new connection.

Plan the route and mark utilities

We identify a suitable discharge point and arrange utility marking before excavation.

Before digging begins

The route is assessed for slope, obstructions, access, and existing surfaces. Utility locations and any needed coordination are addressed before work. We explain the planned excavation and restoration in your scope.

Install the buried pipe and connection

A trench is prepared, drainage pipe is laid, and the existing downspout is connected with a leaf guard.

Pipe and debris control

Pipe size and connection height are selected for the installation. A leaf guard helps intercept larger debris while keeping the connection accessible. Gutters and guards still need routine cleaning.

Set the outlet and restore disturbed areas

The line is routed to the planned discharge point, which may use a pop-up emitter set over gravel.

Outlets and concrete crossings

Where the route crosses concrete, the required section is opened and restored as agreed. Replacement concrete may not match the existing shade. The outlet must remain clear so the extension can discharge water away from the foundation.

Less Water Beside the Foundation

A downspout extension addresses roof runoff. The benefit depends on the complete route and the other drainage conditions around your home.

Explore crawl space waterproofing

Reduce pooling and repeated soil saturation

Moving runoff to a suitable outlet helps reduce the water discharged directly beside the foundation. Other sources of groundwater or seepage may still need separate solutions.

Limit erosion in landscaping

A planned discharge location helps avoid concentrating roof water in vulnerable soil or planting areas. We review the outlet as part of the property’s drainage rather than simply moving the puddle.

Keep gutters, guards, and outlets clear

Leaves, sediment, and vegetation can interfere with drainage. Keep accessible gutters and emitters clear and arrange an assessment if water backs up or begins pooling again.

Why Choose Crawl Space Brothers

Crawl Space Brothers starts with a free inspection, custom-engineered recommendations, and written promises behind the work. Trusted by homeowners since 2019.

A free inspection. A plan built for your home.
Custom-engineered recommendations, a clear written estimate, and room to ask every question.

Get your free inspection
★★★★★Google review
“Mr. White was better than prompt; he called first and arrived before the scheduled time to inspect our crawl space for water intrusion. He was friendly, thorough, knowledgeable and professional in his inspection both inside and outside the house unlike other companies who did not even bother to go into the crawl…”
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space yet sent us exorbitant proposals. Mr. White determined the water intruding the crawl space could be mitigated by grading the soil away from the house and sealing the gutters. He recommended we contact a landscaping company. We would absolutely recommend Crawl Space Brothers to everyone because of the expertise and high level of integrity. He could have ripped us off but he didn't. We appreciate that.”
VenitaVerified Google review · Washington, DC · May 2022
Lifetime transferable warranty

Lifetime transferable warranty.

Protection that stays with your home, even when you sell.

Money-back guarantee

Your money is never at risk.

We stand behind our work with a written money-back guarantee.

Five-star service guarantee

Five-star service guarantee.

Clear communication. Respect for your home. A service promise we put in writing.

Our Downspout Extension Process

A free inspection. A written repair plan. The recommended work explained before you decide.

  1. Free Drainage Inspection

    We inspect roof runoff, downspout locations, pooling, and the available route to a suitable outlet.

  2. Custom Recommendations

    You'll receive a clear explanation of our findings and a written repair plan tailored to your home's needs.

  3. Professional Installation

    Our team completes the agreed trenching, pipe connections, outlet installation, and restoration.

  4. Final Walkthrough & Warranty

    Before the job is complete, we review the finished work with you and explain applicable warranty coverage.

A specialist reviewing recommendations at a homeowner’s table

What Do Underground Downspout Extensions Cost?

The number of downspouts, pipe length, excavation, obstructions, concrete crossings, outlet design, and restoration affect cost. We provide a written estimate after inspection so you can review the route and scope before work starts.

  • No gimmicks or pushy tactics.
  • Clear recommendations and an itemized scope.
  • Time to ask questions before work begins.

Fair & honest pricing.

No sales tactics. No pressure to decide on the spot. Your written estimate explains the work and the price before you make a commitment.

Your money is never at risk.Our written money-back guarantee stands behind the work.

What homeowners are saying.

4.9 ★ average across 1,300+ Google reviews · BBB A+ accredited.

Find Your Local Team

Crawl Space Brothers serves homeowners across the Carolinas, Tennessee, and the Mid-Atlantic. Choose your city for local service details and a free inspection.

District of Columbia, District of ColumbiaAnne Arundel, MarylandBaltimore, MarylandCalvert, MarylandCarroll, MarylandCharles, MarylandFrederick, MarylandHoward, MarylandMontgomery, MarylandPrince George's, MarylandQueen Anne's, MarylandSt. Mary's, MarylandTalbot, MarylandWashington, MarylandBaltimore, MarylandArlington, VirginiaCaroline, VirginiaClarke, VirginiaCulpeper, VirginiaFairfax, VirginiaFauquier, VirginiaFrederick, VirginiaKing George, VirginiaLoudoun, VirginiaMadison, VirginiaOrange, VirginiaPrince William, VirginiaRappahannock, VirginiaSpotsylvania, VirginiaStafford, VirginiaWarren, VirginiaWestmoreland, VirginiaAlexandria, VirginiaFairfax, VirginiaFalls Church, VirginiaManassas, VirginiaManassas Park, VirginiaJefferson, West VirginiaAlamance, North CarolinaAlexander, North CarolinaAnson, North CarolinaAvery, North CarolinaBeaufort, North CarolinaBertie, North CarolinaBladen, North CarolinaBrunswick, North CarolinaBuncombe, North CarolinaBurke, North CarolinaCabarrus, North CarolinaCaldwell, North CarolinaCaswell, North CarolinaCatawba, North CarolinaChatham, North CarolinaCherokee, North CarolinaClay, North CarolinaCleveland, North CarolinaColumbus, North CarolinaCraven, North CarolinaCumberland, North CarolinaDavidson, North CarolinaDavie, North CarolinaDuplin, North CarolinaDurham, North CarolinaEdgecombe, North CarolinaFranklin, North CarolinaGaston, North CarolinaGates, North CarolinaGraham, North CarolinaGranville, North CarolinaGreene, North CarolinaHalifax, North CarolinaHarnett, North CarolinaHaywood, North CarolinaHenderson, North CarolinaHertford, North CarolinaHoke, North CarolinaHyde, North CarolinaIredell, North CarolinaJackson, North CarolinaJohnston, North CarolinaJones, North CarolinaLee, North CarolinaLenoir, North CarolinaLincoln, North CarolinaMcDowell, North CarolinaMacon, North CarolinaMadison, North CarolinaMartin, North CarolinaMecklenburg, North CarolinaMitchell, North CarolinaMontgomery, North CarolinaMoore, North CarolinaNash, North CarolinaNew Hanover, North CarolinaNorthampton, North CarolinaOnslow, North CarolinaOrange, North CarolinaPamlico, North CarolinaPender, North CarolinaPerson, North CarolinaPitt, North CarolinaPolk, North CarolinaRandolph, North CarolinaRobeson, North CarolinaRowan, North CarolinaRutherford, North CarolinaSampson, North CarolinaStanly, North CarolinaSwain, North CarolinaTransylvania, North CarolinaTyrrell, North CarolinaUnion, North CarolinaVance, North CarolinaWake, North CarolinaWarren, North CarolinaWashington, North CarolinaWatauga, North CarolinaWayne, North CarolinaWilkes, North CarolinaWilson, North CarolinaYadkin, North CarolinaYancey, North CarolinaAbbeville, South CarolinaAnderson, South CarolinaCherokee, South CarolinaChester, South CarolinaChesterfield, South CarolinaEdgefield, South CarolinaFairfield, South CarolinaGreenville, South CarolinaGreenwood, South CarolinaKershaw, South CarolinaLancaster, South CarolinaLaurens, South CarolinaLee, South CarolinaLexington, South CarolinaMcCormick, South CarolinaNewberry, South CarolinaOconee, South CarolinaPickens, South CarolinaRichland, South CarolinaSaluda, South CarolinaSpartanburg, South CarolinaUnion, South CarolinaYork, South CarolinaBedford, TennesseeCannon, TennesseeCheatham, TennesseeClay, TennesseeCoffee, TennesseeCumberland, TennesseeDavidson, TennesseeDeKalb, TennesseeDickson, TennesseeFentress, TennesseeFranklin, TennesseeGiles, TennesseeGrundy, TennesseeHickman, TennesseeHouston, TennesseeHumphreys, TennesseeJackson, TennesseeLawrence, TennesseeLewis, TennesseeLincoln, TennesseeMacon, TennesseeMarion, TennesseeMarshall, TennesseeMaury, TennesseeMontgomery, TennesseeMoore, TennesseeOverton, TennesseePerry, TennesseePutnam, TennesseeRobertson, TennesseeRutherford, TennesseeSmith, TennesseeStewart, TennesseeSumner, TennesseeTrousdale, TennesseeVan Buren, TennesseeWarren, TennesseeWayne, TennesseeWhite, TennesseeWilliamson, TennesseeWilson, TennesseeAllen, KentuckyBarren, KentuckyButler, KentuckyChristian, KentuckyEdmonson, KentuckyLogan, KentuckySimpson, KentuckyTodd, KentuckyWarren, Kentucky
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Service availability varies within highlighted counties. Check your ZIP code to find your team.

Gutter Downspout Extensions FAQs

What is an underground downspout extension?

It connects an existing gutter downspout to buried pipe that carries roof runoff to a suitable discharge point away from the foundation.

Will it help with a wet basement or crawl space?

It can help when roof runoff is contributing to water near the foundation. Groundwater, plumbing leaks, or other entry points may need separate work. The inspection identifies the sources before a recommendation is made.

Where does the buried pipe discharge?

The outlet is selected for the property’s slope and drainage conditions. A pop-up emitter over gravel may be part of the installation. We explain the location and how water will leave the system.

Will my lawn or concrete be disturbed?

Trenching affects the agreed route. If it crosses concrete, that area may need to be cut and restored. The scope explains restoration, and new concrete may differ in shade from the existing surface.

Do underground downspout extensions need maintenance?

Yes. Gutters, leaf guards, and outlets need to remain clear. Backing-up water, blocked emitters, or renewed pooling should be assessed rather than assuming the buried line is working normally.

Is the installation guaranteed?

We explain the applicable lifetime transferable warranty, written money-back guarantee, and five-star service guarantee for the work. Your money is never at risk. Written terms define the protection for your project.

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