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Lawn Care & Landscaping
Drainage Solutions & Yard Grading in Northern Virginia
French drains, downspout extensions, and professional regrading that move water away from your foundation for good — so your yard stops flooding, eroding, and drowning your grass every time it rains.
The Short Answer
Yard drainage solutions in Northern Virginia typically include French drains, downspout extensions, and regrading — and most homeowners pay $2,800 to $6,500 for a standard exterior French drain (roughly $10-$35 per linear foot), while simple downspout extensions and spot regrading often run a few hundred dollars. The right fix depends on where the water is coming from: surface runoff usually needs regrading so the ground slopes at least 6 inches over the first 10 feet away from your foundation, while wet spots fed by roof water or a high water table typically need a French drain or buried downspout extension. Lawn Theory diagnoses the actual cause on-site before recommending a fix, so you're not paying for a drain you don't need.
Every Drainage Project Starts With a Real Diagnosis
We don't sell a one-size-fits-all drain. Every project begins with a site walk to trace where the water is actually coming from and where it needs to go — then we build the fix to match.
- On-site water flow assessment — we walk the yard after a rain if possible
- French drain trenching & install — perforated pipe, washed gravel, filter fabric
- Buried downspout extensions — routed 5-10 ft from the foundation to daylight or a pop-up emitter
- Regrading & soil correction — restoring proper slope away from the house
- Dry creek beds & catch basins — for low spots that need to move water fast
- Sod or seed restoration — turf repaired and reseeded after every dig
Investment
Drainage & Grading Pricing
Every yard is different — final pricing depends on trench length, soil, and slope. These starting ranges reflect typical Northern Virginia projects.
Spot Fix
For a single problem area — one wet corner, one downspout, one low spot.
- 1-2 downspout extensions, buried
- Spot regrading of one low area
- Turf patch & seed included
French Drain System
A full French drain along the trouble zone — the standard fix for chronic wet yards.
- Up to 100 linear ft of trenched drain
- Perforated pipe, gravel & fabric
- Daylight or pop-up emitter outlet
- Full turf restoration
Whole-Yard Regrade
For yards fighting water on multiple sides — comprehensive grading plus drainage.
- Full-property grading survey & correction
- Multiple French drains or dry creek beds
- Catch basin tie-ins where needed
- New sod across all disturbed areas
Why Lawn Theory
Water Problems Don't Fix Themselves
Local NoVA Expertise
We know how Fairfax County clay holds water differently than the sandier soils in Loudoun — and we grade accordingly.
Built to Last, Not Patch
Proper trench depth, washed gravel, and filter fabric so your drain doesn't clog and fail in two seasons.
Licensed & Insured
Every excavation and grading project is fully licensed and insured, with utility locates called in before we dig.
Responsive Support
Written quotes back in 24-48 hours and a crew that shows up when scheduled — not "sometime this month."
Built for Clay Soil and Century-Old Storm Patterns
Much of Fairfax, Loudoun, and Prince William County sits on dense clay subsoil that drains poorly on its own — which is exactly why so many Northern Virginia yards develop soggy corners, standing water after storms, and foundation seepage that never existed on paper. We design every French drain and grading plan around your specific soil profile, not a generic national spec: deeper gravel beds and more aggressive slope where clay dominates, tighter downspout tie-ins near older homes with undersized original grading, and drain outlets placed to avoid sending water onto a neighbor's property or into county right-of-way. It's the same reason Fairfax County's Soil and Water Conservation District actively publishes drainage guidance for homeowners — this is a known regional issue, and it needs a regional solution.
Proudly Serving
Drainage & Grading Across Northern Virginia
How We Work
From Walkthrough to Wow, in Three Steps
Consultation
Walk your property with a real expert. Straight answers and a custom assessment, free.
Proposal
A line-item plan with firm pricing. No surprises, no upsells, no pressure.
Implementation
A disciplined crew executes on schedule — and we don't call it done until you do.
What Neighbors Say
Real Wet Yards, Really Fixed
"We had a swamp along our back fence every time it rained. Lawn Theory put in a French drain and it's been bone dry for two years now."
"Our basement wall was staying damp after storms. Turns out our downspouts were dumping right at the foundation. They extended and buried them and the problem just went away."
"They actually explained why the water was pooling before pitching us a fix. The regrade plus a dry creek bed solved a problem two other companies just wanted to trench and bill for."
Questions
Drainage & Grading FAQ
How much does a French drain cost in Northern Virginia?
Most exterior French drains cost between $2,800 and $6,500 for a typical 100-foot run, or roughly $10-$35 per linear foot depending on trench depth, soil conditions, and whether the drain has to cross a driveway, patio, or other hardscape. Clay-heavy soil, tree roots, and buried utilities can each add to the cost. We give you an exact number after an on-site assessment — never a phone quote.
How do I know if I need a French drain or just a downspout extension?
If the wet spot only appears right where a downspout empties, a buried extension routed 5-10 feet away is usually enough. If water is pooling across a broader area, coming from a slope above your yard, or showing up even without rain (a high water table), you likely need a French drain to intercept and redirect the underground flow. We check both possibilities on-site before recommending either one.
What's the proper slope for yard grading to keep water away from my foundation?
The general standard is a drop of at least 6 inches over the first 10 feet away from the house — roughly a 5% grade. Many older Northern Virginia homes were graded flatter than this originally, or have settled over time, which is a leading cause of basement dampness and foundation pressure.
Will a French drain damage my lawn or landscaping?
There's a trench, so there is some disruption, but it's temporary. We cut as narrow a trench as the job allows, stage the excavated soil on tarps to protect surrounding turf, and restore every disturbed area with fresh sod or seed once the drain is backfilled. Most lawns look fully recovered within a few weeks.
How long does a French drain or regrading project take?
A single-zone French drain or downspout extension is typically a one-day job. A whole-yard regrade with multiple drain runs can take 2-4 days depending on square footage and how much soil needs to move. We give you a firm timeline in your written quote.
Why does my Northern Virginia yard flood even though my neighbor's doesn't?
It's almost always about grade and soil, not luck. Homes lower in a subdivision's original grading plan naturally collect runoff from higher lots, and Fairfax County's dense clay subsoil compounds the problem by draining slowly. Older homes also sometimes have settled or reverse-graded areas near the foundation that were never corrected. An on-site assessment identifies the specific cause on your lot.
Can poor drainage really cause foundation damage?
Yes. When water isn't directed away from the house, the soil next to the foundation stays saturated, which builds hydrostatic pressure against basement walls and can lead to cracking, leaks, and long-term structural issues. Extending downspouts and correcting grade near the foundation are two of the most cost-effective ways to prevent this.
Stop Fighting Standing Water
Get a Drainage Plan Built for Your Yard
Tell us where the water's pooling — we'll walk the site, diagnose the real cause, and send a written quote within 24-48 hours.