Yard drainage planning starts with observing water, mapping the slope, and confirming an outlet before choosing a trench or grading scope.
Yard and foundation water
Answer the water question before pricing a method
Record where water starts, where it collects, how long it remains, and whether the pattern follows rain, snowmelt, irrigation, plumbing use, or a high water table. Trace roof runoff, neighboring drainage, hardscape slopes, and low points together.
A yard drainage project can combine a swale, regrading, downspout extension, catch basin, channel drain, or French drain. Each requires a maintainable discharge destination and a restoration plan for soil, turf, planting, paving, or walkways.
Water source, timing, flow direction, low points, and foundation proximity.
Trench length/depth, soil, rock, roots, access, and utility conflicts.
Pipe, aggregate, fabric, basins, cleanouts, outlet, and maintenance access.
Grading, erosion control, restoration, disposal, and future mowing.
French drain versus grading
Grading and a swale move surface water with slope; a French drain collects water through a buried aggregate-and-pipe path. Downspout extensions may solve a concentrated roof-water source without a yard-wide trench. Catch basins and channel drains collect water at a surface point.
The right choice depends on observed water and site constraints, not on a generic promise. Keep a method comparison open until the source, outlet, utilities, and maintenance plan are understood.
French drain versus grading comparison
Option
Best for
Watch for
Grading or swale
Surface runoff with enough open area to create and maintain a positive slope.
Property lines, neighboring flow, erosion, accessibility, and the final outlet.
French drain
A defined collection path where buried pipe and aggregate can reach a suitable outlet.
Trench safety, soil, cleanouts, discharge, roots, utilities, and restoration.
Catch basin or channel drain
Concentrated surface flow at a low point, walk, driveway, or hardscape edge.
Grate maintenance, pipe route, capacity, freeze conditions, and outlet legality.
Local permits and safety
Drainage rules can address stormwater, discharge onto neighboring property, right-of-way work, erosion, grading, and connection to public systems. Requirements vary by locality; verify with the authority having jurisdiction and the property owner before construction.
Do not dig until utilities are located, and do not enter an unsafe excavation. Structural cracking, foundation movement, recurring flooding, mold, sewage, electrical exposure, or an unknown water source needs appropriate evaluation. This guide is planning information, not a diagnosis.
Planning ranges are not bids. Final pricing depends on field conditions, selections, permits, local requirements, and contractor scope. Confirm the work and current local costs before committing.
Worked planning examples
What is the French drain cost for 100 feet?
$2,996–$4,406 planning range using the existing drainage model at its baseline regional factor.
Baseline assumptions
100 linear feet of French drain with the baseline trench depth, loam soil, pipe, aggregate, fabric, access, and restoration assumptions.
The outlet, utility conditions, landscape restoration, and water source require property-specific review.
This is drainage planning, not a diagnosis of a foundation or plumbing problem.
Drainage is a planning estimate, not a diagnosis; only dimensions for selected drainage methods are billed.
Source notes
Planning assumptions only; prices are not supplier-verified quotes, retailer prices, or a bid.
Broad residential cost-guide evidence was fetched 2026-09-15 for reasonableness checks, not imported as precise component rates; confirm current local labor, material, disposal, permit, tax, and site costs.
Regional adjustment is applied once to normalized line-item base costs; the caller supplies the existing ZIP/regional factor.