What a French Drain Really Costs in DFW (2026, Honest Numbers)
Here's the short answer: in 2026, most residential French drains we install in the Mid-Cities run $2,500 to $4,250, built to spec. Exterior surface drains run roughly $25–$35 per linear foot. Large projects combining long runs with regrading can reach $15,000–$25,000. Where your job lands in those ranges comes down to five things: linear footage, depth, obstacles, discharge distance, and restoration — all of which should be visible on a flat, written quote.
Those are our actual numbers, not lead-gen bait. Most cost articles online are written by marketing companies that have never held a shovel, and they quote national averages that don't survive contact with Texas black clay. Here's what actually drives the price, and how to spot a quote that's lying to you.
The 2026 numbers at a glance
| Project | Typical DFW Price (2026) | What's Included |
|---|---|---|
| Residential French drain | $2,500–$4,250 installed | Sch 40 perforated PVC, woven filter sock, washed river rock, lined trench, laser-checked slope, discharge, basic sod restoration |
| Exterior surface drain system | $25–$35 per linear foot | Catch basins, solid PVC transport pipe, trenching, discharge point |
| Large combined project (long runs + regrading) | $15,000–$25,000 | Multiple systems, downspout tie-ins, soil import/export, machine grading, full restoration |
If you're not sure yet whether your problem even calls for a French drain — as opposed to a surface drain or a grading fix — start with our decision guide comparing all three. Buying the right system matters more than buying it cheap.
What actually drives the price
1. Linear footage
The biggest driver, and the most honest one. Every foot of run is trench to dig, pipe, rock, sock, and fabric to install, and spoil to haul. A 40-foot side-yard run and a 120-foot wraparound are fundamentally different projects. This is why a real quote is built from a measured drawing with LF callouts — and why quotes without footage on paper can't be compared at all.
2. Depth
A proper system starts 6–8 inches deep at the downspout pickups and falls 1 inch every 10 feet from there. On a long run, the far end is knee-deep — and every extra inch of depth in dry Houston Black clay is hard-won. Deep trenches also mean more rock to fill and more spoil to haul. Long, deep runs are where labor hours live.
3. Obstacles
Tree roots that need hand-digging (common along the mature-tree streets of Colleyville and Southlake), fence lines to work under or around, sprinkler lines and low-voltage wiring to locate and cross, and — the big one — concrete. Boring under a sidewalk adds real cost; cutting and repouring a section of driveway adds more. An honest quote names these obstacles specifically because the crew has to solve each one.
4. Discharge distance
Collected water has to leave. If your low corner sits 15 feet from the curb, discharge is cheap. If the only legal exit is 80 feet away across the front yard, that's 80 more feet of solid pipe and trench you're paying for. Corner lots and lots that back to greenbelts tend to do well here; interior lots on flat blocks in Bedford and Irving often don't. A contractor who hasn't named your discharge point hasn't finished designing your system.
5. Restoration
Trenching through an established lawn leaves a scar. Basic sod restoration is included in our numbers above; full re-sodding of a large disturbed area, replanting beds, or repairing decorative rock and steel edging is extra and should be itemized. Ask every bidder what "cleanup" means in writing — it's a favorite place to hide the difference between two bids.
Pro tip: Timing affects price less than people think, but access affects it a lot. A backyard with a 10-foot gate that admits a trencher prices differently than one where every foot gets hand-dug behind a 36-inch gate. Mention your gate width when you call — any experienced estimator will ask.
Red flags of a lowball quote
Every year we dig up and rebuild systems that were "a great deal" 18–24 months earlier. The failed installs share the same DNA, and you can spot it in the quote before a shovel hits dirt:
Corrugated pipe. If the quote says "flex pipe," "corrugated," or dodges the pipe question entirely, walk. Flexible corrugated pipe crushes under swelling black clay and its ribbed interior silts shut — it's the number-one reason cheap French drains fail in about two years. The full failure anatomy is in our cornerstone drainage guide. Schedule 40 perforated PVC or nothing.
No filter sock, no fabric. In clay this fine, an unprotected gravel envelope is a countdown timer. If sock and trench liner aren't itemized, they're not in the truck.
No washed gravel. "Gravel" isn't a spec. Unwashed rock arrives pre-loaded with the fines that clog systems; crushed road base compacts nearly solid. Washed river rock, named on the quote.
No slope specification. If the installer can't tell you the fall per 10 feet and how they'll verify it, they're eyeballing your grade — and eyeballed grade in flat Mid-Cities yards is how water ends up standing inside the pipe.
Hourly billing. Trench work billed by the hour puts all the risk on you. Dry black clay digs slow, and you fund every slow hour. Professionals measure, count footage, and commit to a number.
No drawing. A quote without a measured plan — LF callouts, flow arrows, basin locations, named discharge — isn't a design, it's a guess with a price on it.
Warning: The most expensive French drain in DFW is the $1,500 one, because you'll pay for it, then pay to have it dug out, then pay for the real one — and if it spent two years letting water stand against your slab while it silted shut, you may pay a foundation company too. The stakes of that math are laid out in our standing water and foundations guide.
Why flat quotes matter
We quote flat numbers from a measured plan, and we think you should demand the same from anyone bidding your yard. A flat quote does three things an hourly rate never will:
- It proves the contractor measured. You can't commit to a number without counting footage, checking depth, and walking the discharge route. The flat number is evidence the design work happened.
- It makes bids comparable. Three flat quotes against three drawings can be lined up spec-for-spec, footage-for-footage. Three hourly rates tell you nothing about what you'll actually pay.
- It puts the risk where it belongs. If the clay digs slow or the root ball is worse than expected, that's our problem — we priced the job, not the hours. That's what you're paying a professional outfit for.
One honest caveat: a flat quote can only be as good as the plan behind it. Get the drawing, check the specs against the red-flag list above, and make sure the linear footage on paper matches the yard in front of you. Fifteen minutes of homework — or an hour reading through the Learn hub — makes you the best-informed customer any estimator will meet that month.
Common questions
How much does a French drain cost in DFW in 2026?
Most residential French drains in the DFW Mid-Cities run $2,500 to $4,250 installed, built to spec with Schedule 40 perforated PVC, filter sock, washed river rock, and measured slope. Exterior surface drain systems run roughly $25 to $35 per linear foot. Large projects that combine long drain runs with regrading can reach $15,000 to $25,000.
Why do French drain quotes for the same yard vary so much?
Because the quotes usually describe different products. One bid prices Schedule 40 PVC, washed rock, filter sock, lined trench, laser-checked slope, and sod restoration; another prices corrugated pipe in a bare trench with whatever gravel is cheapest. They differ by thousands of dollars because one system lasts 25-plus years and the other fails in about two. Compare the specs and linear footage on paper, not just the bottom line.
Is a $1,200 French drain quote too good to be true?
For anything beyond a very short run, almost certainly. At real 2026 material prices, a to-spec French drain of typical residential length can't be built profitably for $1,200 — so something in the spec is missing: corrugated pipe instead of rigid PVC, no filter sock, unwashed gravel, no trench liner, or no measured slope. Each omission is a known failure mode in expansive black clay.
What does a French drain cost per linear foot in DFW?
Exterior surface drains run about $25 to $35 per linear foot installed. French drains price higher per foot because of the gravel envelope, fabric, and deeper trenching, which is why most contractors quote them as a project: typical Mid-Cities residential installs land between $2,500 and $4,250 total depending on length, depth, obstacles, and discharge distance.
Should I pay hourly for a French drain install?
No. Reputable drainage contractors quote a flat price from a measured plan, because they've counted the linear footage and know their costs. Hourly billing on trench work moves all the risk to you — dry black clay digs slowly, and every slow hour is billed to the homeowner. A flat quote against a drawn plan with linear-foot callouts is the standard you should insist on.