How much does a french drain installation cost in Seattle?

A french drain installation in Seattle typically costs $3,050-$12,202, 22% above the $5,000 national average.

What is the cost per linear ft for a french drain installation in Seattle?

French Drain Installation in Seattle typically costs $31-$92 per linear ft.

How long does a french drain installation take?

A french drain installation typically takes 2-4 days. The minimum timeline is 1-2 days, and complex projects can run 5-7 days.

Can I DIY a french drain installation?

DIY feasibility for a french drain installation is rated Low to Moderate - Simple exterior yard drains at shallow depths are a reasonable DIY project for physically fit homeowners. Interior basement French drains require concrete cutting, significant excavation, and plumbing knowledge that's beyond most DIYers. Foundation-level exterior drains involve deep excavation that's both dangerous and requires heavy equipment..

Cost to French Drain Installation in Seattle, WA (2026)

If you’re budgeting a french drain installation in Seattle, most projects run $3,050-$12,202, 22% above the $5,000 national average. What moves that number most is usually one thing: Interior vs Exterior Installation. On its own it can swing the cost by $1,000 - $5,000, so that’s the decision to slow down on before you sweat the smaller stuff.

Easiest place to save: Get quotes for both interior and exterior solutions. Interior drains are often less expensive because they don't require heavy excavation equipment or landscape restoration.

In the West Coast (where Seattle sits): High labor rates drive costs up. Hillside properties in California often need extensive exterior drainage systems.

$3,050-$12,202 in Seattle

22% above the national average · 1.22x cost multiplier

In Seattle, a french drain installation runs $3,050 to $12,202 on average - about 22% above what homeowners pay nationwide. The West Coast market's labor costs account for most of the gap, with material pricing and local permitting fees adding to the spread. Use the cost table below to compare budget, mid-range, and premium options side by side.

Cost Breakdown in Seattle

Line Item	Low	Mid	High
Cost per linear ft	$31	$55	$92
Materials	$912	$1,824	$3,990
Labor	$1,922	$3,843	$7,046
Permits	$228	$285	$456
Total	$3,062+22% vs. national avg	$6,237+22% vs. national avg	$12,176+22% vs. national avg

Budget

Exterior French drain, shallow trench (18 inches), corrugated perforated pipe, landscape fabric, gravel backfill, about 50 linear feet

Mid-Range

Interior perimeter French drain, 100 linear feet along basement walls, rigid PVC pipe, connected to sump pit, concrete cutting and patching

Premium

Full interior and exterior French drain system, 150+ linear feet, commercial-grade drainage board, multiple drain connections, sump pump integration, full waterproofing membrane

Material Options

Material prices below are national averages; availability in Seattle may shift costs slightly.

Material	Cost/Unit	Pros	Cons	Best For
Corrugated Perforated Pipe	$0.50 - $1.50 per linear foot	Cheapest option, flexible and easy to install, widely available, good for simple exterior drains	Can crush under weight, corrugations trap sediment over time, shorter lifespan (10-15 years)	Budget exterior yard drainage projects, temporary solutions, shallow installationsCheapest option, flexible and easy to install, widely available, good for simple exterior drains
Rigid PVC Perforated Pipe	$1.50 - $4 per linear foot	Very durable (50+ year lifespan), smooth interior resists clogging, handles high water volume, maintains shape	More expensive, requires fittings at every turn, rigid so it can't bend around obstacles	Interior basement French drains, deep exterior foundation drains, permanent installationsVery durable (50+ year lifespan), smooth interior resists clogging, handles high water volume, maintains shape
Drain Tile with Filter Sock	$1 - $3 per linear foot	Built-in filter prevents sediment infiltration, reduces maintenance, good lifespan	Filter sock can clog in very silty soil, moderate cost, not as strong as rigid PVC	Exterior drains in sandy or loamy soil, mid-budget projects where low maintenance mattersBuilt-in filter prevents sediment infiltration, reduces maintenance, good lifespan
EZflow Drainage Bundle	$3 - $6 per linear foot	Pipe pre-wrapped in gravel aggregate, no separate gravel needed, faster installation, consistent drainage	More expensive per foot, limited sizes, heavier to handle, not available everywhere	DIY exterior projects, tight trenches where gravel is hard to place, projects where speed mattersPipe pre-wrapped in gravel aggregate, no separate gravel needed, faster installation, consistent drainage
Commercial Drainage Board (Dimple Mat)	$2 - $5 per sq ft of wall coverage	Creates air gap against foundation wall, channels water down to drain, protects waterproofing membrane	Only used with interior or exterior wall drainage, adds significant cost, requires professional installation	Comprehensive interior waterproofing systems, used alongside French drains for maximum protectionCreates air gap against foundation wall, channels water down to drain, protects waterproofing membrane

Other Projects in Seattle

Full Kitchen Remodel

Full Bathroom Remodel

Composite Deck Building

Back to national average for French Drain Installation

Seattle Estimate

Typical Range

$3,050-$12,202

vs. National Average

22% above national

Cost Multiplier

1.22x

Cost Per linear ft

$31-$92

This 1.22x estimate prices Seattle labor from BLS Occupational Employment and Wage Statistics (May 2025) and applies a lighter regional adjustment to materials and permits, which vary less by metro than labor does. Actual bids vary by contractor, project scope, and timing.

See national average costs →