Licensed Plumber Required

Sewer Line Replacement Cost in Seattle, WA

PEX Pipes – 1 Bath

The average cost of sewer line replacement in Seattle, WA with PEX pipes (1-bath, 900 sq ft) is $4,100, with most homeowners paying between $3,400 and $5,000 depending on access difficulty, permit requirements, and contractor availability.

Cost Breakdown - Seattle, WA

Parts & Materials
$1,770
PEX profile
Labor
$2,000
13.1 hrs x $129/hr
Permits & Misc
$330
permits, disposal, parts
Total Estimate
$4,100
Range: $3,400-$5,000

* Estimates based on Seattle area labor rates ($129/hr). Actual costs vary. Get 3 quotes.

Home Profile

Pipe Material
PEX
Bathrooms
1 Bath
Home Size
900 sq ft
Local Labor Rate
$129/hr

Signs You Need This Service

  • !Recurring sewer backups despite repeated cleaning
  • !Sewer line over 40 years old
  • !Tree root intrusion confirmed on camera
  • !Collapsed or offset pipe sections
  • !Escalating repair costs with no lasting fix

What is Included

  • +Full camera inspection and mapping
  • +Excavate full sewer line length
  • +Remove old clay, cast iron, or Orangeburg pipe
  • +Install new PVC or HDPE sewer line
  • +Backfill and restore landscaping
  • +Permit, inspection, and city approval

Ready to Hire a Plumber in Seattle?

Use this estimate as your baseline. Get at least 3 quotes and ask each plumber to itemize parts, labor, and permits separately.

Fair range: $3,400 to $5,000

Compare Quotes from Top-Rated Plumbers via Angi

Frequently Asked Questions

How much does sewer line replacement cost in Seattle, WA?

The average cost of sewer line replacement in Seattle, WA is $4,100, with most homeowners paying between $3,400 and $5,000 depending on home conditions and contractor availability.

How long does sewer line replacement take?

Most sewer line replacement jobs take 13.1 hours for a 1-bathroom home with PEX pipes. Complex jobs or older homes may require additional time.

Can I do sewer line replacement myself?

This job requires a licensed plumber due to permit requirements, complexity, or safety considerations.

What affects sewer line replacement cost in Seattle?

Key cost factors include pipe material (PEX), home size (900 sq ft, 1 baths), local labor rates ($129/hr in Seattle), and permit fees.

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