French drain / drain tile Cost in Manassas, Virginia
A gravel-filled trench with a perforated pipe collects groundwater and channels it away from the foundation, installed either in the exterior yard/perimeter or along the interior basement footing beneath the slab.
In Manassas, the expansive shrink-swell clays common around here hold water against the foundation, which a French drain redirects. Local labor rates, your home's age, and site access then set where in the french drain / drain tile range your job lands.
Typical figures from local cost data, not a quote. Estimate your specific job →
Interior (under-slab) French drains cost more per foot than exterior (yard) drains, because installing them means cutting and re-pouring the basement slab and tying into a sump pump; an exterior yard trench is simpler. A full exterior excavation down to the footing is priced separately, as exterior waterproofing.
When french drain / drain tile is used
Used to relieve hydrostatic pressure and redirect water where a yard, foundation, or basement repeatedly collects water; interior perimeter drain tile costs more due to concrete cutting and sump-pump integration.
Lifespan: A properly installed French drain can function for roughly 30 or more years, though periodic flushing and debris removal are needed to prevent clogging.
French drain / drain tile costs near Manassas
Local labor rates and soil differ across the region, so the same job prices differently a short drive away. These are the closest markets we cover.
- Prince William3 mi$950 to $9,300 typical
- Fairfax15 mi$950 to $9,300 typical
- Alexandria20 mi$950 to $9,550 typical
Why costs differ in Manassas
Soil & geology
Manassas sits in the Piedmont's Triassic Culpeper Basin on the Bull Run Formation, red-to-purple iron-rich micaceous siltstone and sandstone interbedded with gray shale and lacustrine clay, with a diabase dike to the west that weathers to thick calcium-rich soil. The red-bed and lacustrine clays weather to red-brown soils, and Virginia Energy flags the Mesozoic basin around Culpeper and Manassas among the state's most likely areas for expansive or frost-heave-susceptible soils.
Permits
Structural and foundation repairs require a building permit from the City of Manassas Department of Community Development. Work on an R-5 home is charged at $0.45 per square foot (all trades), $100 minimum, with a $50 residential minor plan-review fee for structural repairs; a structure defined as a building is alternatively 1.5% of the contract price, $150 minimum.
Local labor
Construction labor here runs 7% below the national average (RSMeans index 0.929), which is applied to every estimate on this page.
Housing stock
The median Manassas home is about 41 years old, in City of Manassas. Older homes carry more unknowns behind a foundation repair.
Where these numbers come from
Every figure on this page traces to a published source, with the date we retrieved it. The Manassas soil, permit and labor figures come from National Park Service, City of Manassas Department of Community Development, Virginia DMAS and US Census Bureau. The national french drain / drain tile (interior or exterior) cost range and method guidance come from Modernize and HomeGuide. Ranges are typical costs, not a quote.
- National Park Service (Manassas National Battlefield Park Geology)
- City of Manassas Department of Community Development (Building Permit Fee Schedule)
- Virginia DMAS, RS Means Data (Jan-2025 RSMeans location factors): mapped to nearest RSMeans city Fairfax = 92.9 (no dedicated Manassas city)
- US Census Bureau, ACS 2024 5-year, table B25035 (via Census Reporter)
- US Census Bureau, 2023 Gazetteer (INTPTLAT/INTPTLONG)
- Modernize
- HomeGuide
Frequently asked questions
How much does french drain / drain tile cost in Manassas?
In Manassas, french drain / drain tile runs about $37–$93 per linear ft for interior, or roughly $3,700–$9,300 for a typical job. Exact cost depends on the extent of the work. Use the calculator for an estimate specific to your home.
When is french drain / drain tile the right fix?
Used to relieve hydrostatic pressure and redirect water where a yard, foundation, or basement repeatedly collects water; interior perimeter drain tile costs more due to concrete cutting and sump-pump integration.
How long does french drain / drain tile last?
A properly installed French drain can function for roughly 30 or more years, though periodic flushing and debris removal are needed to prevent clogging.
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