How Much Does a French Drain Cost in Bryan–College Station? (2026)

What actually drives the cost of a French drain

Five things set the price of a French drain: length, depth, where the water has to go, what is in the way, and the ground itself. Pipe and gravel are the cheap part. Labor and restoration are where the money goes.

1. Length of the run

Drains are priced by the linear foot, so length is the starting number. A short run along one side of the house might be 40–60 feet; a drain that wraps the back of the lot and runs to the street can pass 150–200 feet. Published College Station figures scale almost straight-line with length, from $400–$630 for 20 feet to $2,020–$3,150 for 100 feet.

2. Trench depth

Deeper trenches cost more because every extra foot of depth is more digging, more spoil to haul, and more gravel to fill. The College Station survey notes that a shallow surface drain is the least expensive, while drains needing a 2-, 3- or 4-foot trench get more expensive the deeper they go. A drain meant to catch surface runoff can stay shallow; one meant to intercept groundwater near a foundation usually cannot.

3. Where the water discharges

A French drain only works if the water has somewhere lower to go. Running it to daylight at a lower part of the lot or the street is usually the cheapest outlet. If there is no fall to daylight, the system needs a pop-up emitter, a longer run, or a dry well, and each adds cost.

4. What is in the trench line

Sod, flower beds, sprinkler lines, tree roots, fences, and concrete walks all sit in the path of a typical drain. Each one means careful hand work, a repair, or a cut. National data shows the per-foot price climbing sharply by location: $20–$30 in an open yard, $45–$55 at a driveway, and $50–$80 tight around a house.

5. The soil

Brazos County clay is dense, sticky when wet, and hard as brick in August. It slows trenching, and it is also the reason drainage matters here: clay barely absorbs water, so it sheds it across the surface and toward whatever is lowest, often the slab.

French drain cost breakdown by component

The materials in a French drain are inexpensive; most of the price is labor, equipment, and putting the yard back. The figures below are published national averages unless marked as College Station.

French drain vs. channel drain vs. downspout tie-ins vs. regrading

A French drain is the right fix for water that soaks in and sits; it is not always the right fix for water that sheets across the surface. Many Bryan and College Station yards need one of the options below, or a combination.

French drain

A French drain is a gravel-filled trench with perforated pipe that collects water from the soil and carries it away. It is the fix when the ground stays wet for days after rain or water collects along the foundation, as covered on our drainage and excavation page.

Surface or channel drain

A channel drain is a slotted grate set flush in concrete that catches water running across a hard surface. It is the better choice when a driveway or patio pitches water toward the garage or back door.

Downspout tie-ins

Tying downspouts into buried solid pipe moves roof water well away from the slab, often ending at a pop-up emitter in the lawn. On many houses, gutters dumping at the corners are the whole problem, and tie-ins cost far less than a full perimeter drain.

Regrading

Regrading reshapes the soil so it falls away from the house. When the problem is simply negative slope, it fixes the cause rather than catching the symptom, and national averages put it around $1,500–$2,600 for a typical job.

French drain cost by project size

At the published College Station rate of $20–$31 per linear foot, total cost tracks length closely. The tiers below use that rate; the national figures are shown for comparison and run wider because they include harder sites.

Small: about 50 feet

A 50-foot drain, such as one side yard from a downspout to the front, works out to roughly $1,000–$1,550 at the local rate. National data puts 50 feet of exterior drain at $1,250–$2,000.

Medium: about 100 feet

A 100-foot drain across the back of a typical lot is listed at $2,020–$3,150 in the College Station survey. National figures for the same length run $3,500–$4,000, and some guides stretch to $1,000–$6,500 depending on depth.

Large: about 200 feet

A 200-foot system wrapping two sides of the house and running to the street works out to roughly $4,000–$6,200 at the local per-foot rate. National guides list $2,000–$15,000 for 200 feet of exterior drain, a range that shows how much depth, access, and restoration matter at this size.

Local factors in Bryan–College Station

Brazos Valley soil and weather make drainage more important here than in many places, and they also shape how a drain has to be built.

• Clay soil. Brazos County clay absorbs water slowly and sheds it fast. A drain here needs fabric to keep fine clay from clogging the gravel, and enough fall to move water before it backs up.
• Heavy storm events. Central Texas rain tends to come in bursts, several inches in a few hours, rather than steady drizzle. A drain sized for a light shower can be overwhelmed; outlets and pipe size need to handle a real storm.
• Slab foundations. Most homes here sit on slabs. Clay swells when wet and shrinks when dry, so water pooling against one side of a slab while the other side stays dry is exactly the uneven movement that leads to cracks and sticking doors.
• Summer heat and drought. Clay baked hard in July and August is slow to dig, and trench walls in wet clay in spring can slump. Timing affects how quickly the work goes.
• City and HOA rules. Water cannot simply be dumped onto a neighbor’s lot. Where a drain discharges to the street or an easement, check with the City of Bryan or College Station and any HOA before work starts.

The same work is available on both sides of Texas Avenue; see our College Station drainage page for local details.

When grading alone fixes the problem

Regrading alone is often enough when water is running toward the house across the surface rather than sitting in the soil. If the yard slopes back toward the slab, a drain only catches water the grade is sending the wrong way.

• Water flows toward the foundation during rain and drains off within a few hours afterward.
• Beds or soil have been built up against the house over the years, so the ground sits higher than it should at the slab.
• There is enough room on the lot to create a gentle slope away from the house.
• Downspouts are already extended or tied in, and the problem remains.

A French drain is the better answer when the ground stays saturated for days, when there is no room to change the slope, or when water is coming from a neighbor’s higher lot. Often the best result is grading plus downspout tie-ins, with a shorter drain only where it is needed. Rebuilding beds at the right height is part of that work.

Hidden costs most French drain quotes leave out

The per-foot price usually covers trench, pipe, and gravel; the extras below are what turn a $2,500 estimate into a bigger bill. Ask whether each one is included before you sign.

1. Sod and bed repair. A trench tears up a strip of lawn. National sod-laying averages run $0.90–$1.80 per square foot, so re-sodding a 2-foot-wide strip along a 100-foot drain (200 sq ft) adds roughly $180–$360.
2. Utility locates. Texas law requires homeowners and contractors to contact Texas811 two business days before digging. The call is free, but it can delay the start, and marked lines may force a route change or hand digging.
3. Sprinkler lines. 811 has utility operators mark their own lines; your private sprinkler system is not one of them. Trenches cross sprinkler lines constantly; a broken sprinkler pipe typically costs $150–$370 to repair nationally.
4. Concrete cutting. Crossing a walk or driveway means saw-cutting and patching. Published rates run about $4–$10 per linear foot for a typical 4–6 inch slab, with minimum trip charges of $150–$400.
5. Spoil haul-off. A deep trench produces a lot of clay. Ask whether it is hauled away, spread on site, or left in a pile.
6. Outlet work. A pop-up emitter, curb outlet, or dry well is sometimes quoted separately from the drain itself.

Mistakes that cost homeowners money

Most failed French drains fail for the same few reasons, and nearly all of them are decided before the first shovel goes in.

1. Hiring on price alone

The cheapest bid is often the shallowest trench, the least gravel, and no fabric. It looks the same when the sod goes back down and clogs within a few seasons in Brazos clay.

2. No fall to a real outlet

A drain that runs level or ends in a low spot simply stores water underground. Ask where the water ends up and how much slope the pipe has along the way.

3. Skipping the filter fabric

Without fabric, fine clay particles migrate into the gravel and pipe. The drain slowly silts up, and the fix is digging it all out again.

4. Treating the symptom, not the cause

Installing a long perimeter drain when the real problem is a downspout dumping at the corner or soil sloping toward the house wastes money. Fix grade and gutters first, then drain what is left.

5. Tying downspouts into the perforated pipe

Roof water pushed into a perforated French drain can flood it and soak the very soil you are trying to dry. Downspouts belong in their own solid pipe.

How to compare French drain quotes

A real French drain quote spells out the route, depth, materials, outlet, and restoration in writing, so you can compare bids line by line instead of by the total alone.

• Route and length: where the drain starts and ends, in feet.
• Trench depth and width, and how much fall the pipe will have.
• Materials: pipe type and diameter, gravel type, and whether fabric wraps the trench.
• Outlet: daylight, curb, pop-up emitter, or dry well, and where it sits.
• Downspouts: whether they are tied in with separate solid pipe.
• Restoration: sod, beds, sprinkler repair, and concrete patching, each marked included or extra.
• Locates and cleanup: who calls 811 and what happens to the excavated clay.

GreenRiver walks the yard, looks at where the water sits and where it can go, and puts the scope in a free written estimate. You can request a free estimate, see drainage and grading jobs on our work page, or read more on the Bryan drainage page.

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