Short answer: across the trade, a residential French drain in the Texas Hill Country generally runs somewhere in the $30 to $80 per linear foot range, which puts most jobs between roughly $1,500 and $8,000. That is a wide spread for a reason. A French drain is not a product you buy by the foot — it is an excavation problem, and out here the ground fights back. Below is what actually moves the number, framed honestly so you can read a quote and know whether it is fair.
One thing up front: the ranges on this page are general market estimates from across the drainage trade — not Johnson Ranch Landscape's rates. We don't price a drain we haven't walked. Use these numbers to understand the cost drivers, then get a real figure for your property.
Why the Hill Country is its own pricing world
In most of the country, a French drain is mostly labor in dirt. Here, the cost lives in the rock. Most Bulverde, Spring Branch, and Canyon Lake lots sit on caliche and limestone within the first foot or two of soil. A trench that takes a couple easy hours in sandy loam can eat a full day with a rock saw, a hammer attachment on a mini-excavator, or a heavy trencher. That single factor — how much rock has to be cut and hauled — is the biggest reason two drains of the same length can be priced thousands of dollars apart.
The flip side of caliche is why you need the drain in the first place: it sheds water instead of absorbing it, so after a 2-3 inch rain the runoff routes around the rock and pools wherever the grade lets it sit — usually against a foundation, a patio, or the low corner of a yard. That is the same Hill Country condition we walk for on every drainage correction project.
The market ranges, and what each piece means
Here is a general breakdown of how French-drain pricing tends to stack up across the trade in our region. Read these as estimates that move with site conditions, not a menu.
| Cost factor | General market range | What drives it |
|---|---|---|
| Standard run (soft soil) | $30–$50 / linear ft | Easy trenching, shallow depth, clear outlet |
| Run through caliche / limestone | $55–$80+ / linear ft | Rock saw or hammer time, slower dig, spoil haul-off |
| Deep run (foundation depth) | Upper end + extra | 18–36" depth, shoring, more gravel and pipe |
| Outlet / daylight or pop-up | $150–$600 each | Where the water legally exits the system |
| Surface restoration | Varies | Re-sod, re-mulch, or rebuild hardscape over the trench |
Length and depth
French drains are priced largely by the foot, so a 40-foot run costs far less than a 120-foot run. Depth matters just as much. A shallow drain catching surface water is cheap; a drain dug to foundation depth to relieve hydrostatic pressure means more excavation, more rock, more gravel, and sometimes shoring — all of which push toward the top of the range.
Surface water vs. sub-surface water
If you're chasing standing water that sits on top of the yard, a relatively shallow trench with a gravel envelope often solves it. If water is wicking up against your slab or coming through a hillside, that's a sub-surface problem that needs a deeper, properly bedded drain — a bigger job. Diagnosing which one you have is half the value of a site walk.
Gravel-and-pipe vs. pipe-only
A real French drain is perforated pipe wrapped in geotextile fabric and surrounded by a clean gravel envelope. Some "budget" installs skip the gravel and fabric and just bury a pipe. It's cheaper up front and it clogs with silt — then you pay twice. The gravel and fabric are not the place to save money in Hill Country soil.
The outlet — where the water goes
This is the part most cheap drains get wrong. Water has to exit somewhere lower than where it enters: a daylight outlet on a downhill slope, a pop-up emitter, or a tie-in to existing storm drainage. On a flat lot or a lot that drains toward the house, finding a legal outlet is the hardest engineering on the job — and you can't legally dump concentrated runoff onto a neighbor's property. No outlet, no drain. Just a buried trench full of water.
Permits, slope, and restoration
Most simple residential French drains don't trigger a permit, but work near a creek, in a floodplain, or tied into public storm infrastructure can. Steep slope can cut both ways — it gives you a free outlet but makes the trench harder to dig and stabilize. And don't forget restoration: the trench has to be put back. Re-sodding a lawn is minor; rebuilding a flagstone patio you trenched through is not.
Why the cheapest quote usually costs the most
We get called out regularly to fix French drains other crews installed — drains that run uphill, dump into clay with nowhere to go, skip the fabric, or have no outlet at all. Redoing a failed drain means paying for the same trench twice, plus whatever foundation or erosion damage happened while it wasn't working. The engineering matters more than the materials. A drain priced honestly for the rock and the outlet beats a cheap number that ignores both.
Getting a real number
Because caliche depth, run length, and outlet options vary lot to lot, the only honest price is the one that comes after someone reads your site. We serve Bulverde, Spring Branch, and the surrounding Hill Country, and we walk the property — ideally after a rain, when it tells the truth — before we put a number on paper. Build a proposal and we'll come look, map the water, and price it in writing. No guessing.