If water ponds in your NCSD yard after storms, or if a low corner of your property stays squishy for days after the rain stops, there\u2019s a good chance someone has suggested a French drain. Here\u2019s what it actually costs in San Diego in 2026 \u2014 and when it\u2019s the right fix.
The short answer
Typical NCSD residential French drain installations run $55 to $150 per linear foot installed, with most straightforward projects landing at $2,400\u2013$4,500 for a basic run.
The range is wide because French drain pricing is driven almost entirely by three variables: length, depth, and access.
What moves the number
1. Length
Most residential French drains run 20\u201360 linear feet. Pricing per-foot drops a bit as the job gets longer (fixed setup costs spread across more linear footage).
2. Depth and soil type
A 2-foot trench through sandy loam is a very different job from a 3-foot trench through decomposed granite or caliche. NCSD soil varies dramatically even within a single property. On heavier clay or rocky sites, plan for higher pricing.
3. Access
Can the mini-excavator fit through the side yard? Do we have to hand-dig a 40-foot trench because the only approach is through a tight walkway? Hand-dig trenching can run $150+ per linear foot \u2014 sometimes double machine-dig pricing.
4. Discharge point
A French drain has to drain to somewhere. If there\u2019s a daylight point at the property edge (street, alley, swale), that\u2019s easy. If the water has to be pumped or channeled to the curb 80 feet away through hardscape, that\u2019s a different conversation.
5. Tie-in to existing drainage
Connecting to existing downspout drains, catch basins, or dry wells adds fittings and labor.
What a French drain actually is
The name gets misused. A proper French drain is:
- A trench (12\u201324” wide, typically 24\u201336” deep)
- Lined with filter fabric
- A perforated pipe laid in the bottom
- Backfilled with clean drainage rock (usually 3/4” crushed)
- Capped with filter fabric
- Topped with soil or decorative rock
Water soaks through the surface, through the rock, into the pipe, and flows to the discharge point. Done right, it lasts 20\u201330 years.
When a French drain is the right fix
Good candidate situations:
- Low spot that holds water after rain and doesn\u2019t drain naturally
- Runoff from a neighbor\u2019s property accumulating on yours
- Water seeping into a crawlspace or against a foundation (French drain along the foundation)
- Hillside base where water accumulates before it can run off
When a French drain is NOT the right fix
Some problems look like drainage problems but need a different solution:
- Surface runoff moving the wrong way \u2014 often a regrading job, not a drain
- Downspout discharge onto the yard \u2014 usually a solid downspout extension is the cheaper fix
- Driveway or patio flooding \u2014 channel drain (linear trench drain) is typically better than French
- High water table seasonal issues \u2014 may need a sump pump system, not a French drain
We\u2019ll tell you which situation you have after we walk the yard \u2014 the wrong solution can cost as much as the right one and not solve the problem.
2026 NCSD French drain pricing in detail
| Scope | Typical price |
|---|---|
| Basic 20\u201330 ft run, easy access, good discharge | $2,400\u2013$3,500 |
| Longer run (40\u201360 ft), standard conditions | $3,500\u2013$6,000 |
| Hand-dig trenching (tight access, 30\u201340 ft) | $5,500\u2013$8,500 |
| Complex job (multiple runs, clay, limited discharge) | $7,500\u2013$14,000+ |
Add-ons that are common:
- Catch basin / atrium grate tie-in: $200\u2013$500 each
- Sump pump install (if gravity-drain isn\u2019t possible): $1,800\u2013$3,500
- Hardscape patching after trench: varies by surface
What our process looks like
- Walk the yard during or just after a rain if possible \u2014 easiest way to diagnose accurately. If that\u2019s not feasible, we look for the telltale signs: moss growth, soil compaction patterns, wear marks.
- Determine the water source and target \u2014 where\u2019s it coming from, where does it need to go.
- Quote two options when sensible \u2014 the full fix and a partial fix, so you can choose.
- Install in 1\u20133 days \u2014 most residential French drains are same-day or two-day jobs.
- Test under hose before closing up the trench, so we know it flows.
Do I need a permit?
Usually no for residential French drains within your property boundary. Permits are required if:
- You\u2019re discharging into the public right-of-way (street, sidewalk, city storm drain)
- The scope includes significant grading (more than 50 cubic yards moved)
- You\u2019re tying into municipal drainage infrastructure
We check your city\u2019s requirements before quoting.
Ready to fix it?
If your yard\u2019s holding water after the rain, it\u2019s worth fixing before the next storm season rather than after. Call (760) 314-1359 for a free walk-through, or request an estimate. Also see our irrigation & drainage service for the full scope of what we handle.
Published May 15, 2026