How Much Does French Drain Installation Cost in San Francisco, CA? (2026)

Average Cost

$14,936–$30,030

Materials

$10,920–$22,505

Labor (San Francisco)

$1,029–$1,519

Labor rates in San Francisco are +35% compared to Sacramento Metro baseline.

A French drain installation includes trenching a sloped channel, lining it with filter fabric, laying perforated pipe on a gravel bed, backfilling with clean drain rock, and restoring the surface. French drains redirect subsurface water away from foundations, patios, and low-lying yard areas. This estimate reflects Sacramento-area pricing for 2025-2026.

While Sacramento's summers are dry, heavy winter rains (November-March) can saturate clay soils and cause standing water. French drains are essential for homes with poor natural drainage in the Sacramento Valley.

San Francisco is located in San Francisco County (San Francisco). Iconic fog city with Victorian painted ladies, Edwardian flats, and modern high-rises. The local utility provider is PG&E.

Cost Calculator

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City

Linear feet of drain

Materials Included

Perforated corrugated pipe (4")2500 linear ft

$2,500–$6,250

Clean drain rock (3/4")200 cu yd

$7,000–$12,000

Non-woven filter fabric2750 linear ft

$1,375–$4,125

Catch basin / pop-up emitter2 each

$30–$90

Pipe fittings, couplings, elbows1 lot

$15–$40

Labor(San Francisco +35%)

Drainage installer10h @ $68–$101/hr

$675–$1,013

Laborer / trenching7.5h @ $47–$68/hr

$354–$506

Contractor Markup25%

0%Avg 30%100%

Materials

$10,920–$22,505

Labor

$1,029–$1,519

Markup

$2,987–$6,006

Estimated Total Cost

$14,936 – $30,030

$299–$601 per unit

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Project Timeline

Drainage assessment & layout

30-60 minutes

Evaluate water flow patterns, identify problem areas, and mark the drain path with proper slope (1% minimum grade).

Trenching

2-5 hours

Excavate a trench 12-18 inches wide and 18-24 inches deep along the planned route, maintaining consistent downhill slope.

Pipe & gravel installation

2-4 hours

Line the trench with filter fabric, add a 2-inch gravel bed, lay perforated pipe (holes down), and fill with drain rock to within 4 inches of grade.

Surface restoration & testing

1-2 hours

Fold filter fabric over the gravel, backfill with topsoil, restore sod or landscape, install pop-up emitters, and test the system with water.

Materials Breakdown

Material	Qty	Unit	Unit Cost	Total
Perforated corrugated pipe (4")	2500	linear ft	$1–$2.5	$2,500–$6,250
Clean drain rock (3/4")	200	cu yd	$35–$60	$7,000–$12,000
Non-woven filter fabric	2750	linear ft	$0.5–$1.5	$1,375–$4,125
Catch basin / pop-up emitter	2	each	$15–$45	$30–$90
Pipe fittings, couplings, elbows	1	lot	$15–$40	$15–$40

French Drain Installation in San Francisco — FAQ

How deep should a French drain be?+

Most residential French drains are 18-24 inches deep. For foundation drainage, the trench bottom should be at or below the footing level. Deeper drains intercept more groundwater but cost more to install.

Will a French drain solve my yard flooding?+

French drains are effective for subsurface water and slow-draining soils. For surface water runoff, you may also need a surface drain or channel drain. A drainage assessment will determine the best solution.

How long does a French drain last?+

With proper filter fabric and clean drain rock, a French drain lasts 20-30+ years. Fabric prevents silt from clogging the gravel and pipe, which is the main cause of premature failure.

Can I install a French drain myself?+

Small, shallow French drains are a feasible DIY project. However, drains near foundations, under hardscape, or requiring utility locates are best handled by a professional to avoid damage and ensure proper slope.