Sump Pump Installation Cost in Seattle (2026)
Average cost in Seattle
$750 – $3,800
$150 – $1,200 per sq ft
In Seattle, the average is $1,335 and most projects cost between $750 and $3,800, or about $150 – $1,200 per sq ft. Prices are before tax and based on 8 sources.
Cost Breakdown
ItemizedProfessional plumbing installation (4-8 hours)
45%
Sump pump unit, basin, and discharge piping
35%
King County Public Health plumbing permit fees
10%
Dedicated circuit installation or outlet upgrade
10%
Sales Tax at 6.5%
📋What's Included
ScopeTypically Includes
- Sump pump unit
- Sump pit (basin)
- Check valve
- Discharge pipe
- Labor & installation
Typically Excludes
- Battery backup system
- Exterior drainage tie-in
- Floor drain installation
- Waterproofing
- Electrical panel upgrade
Based on a standard 1/3 HP submersible sump pump with new pit.
🧮Estimate your project
LiveYour estimate in Seattle
Likely range $750 – $2,937
- Labor45%$601
- Materials35%$467
- Permits & Inspections10%$134
- Electrical Work10%$134
Pedestal (basic)
$1,335
Submersible standard
$1,868
Submersible + battery backup
$2,669
Calibrated to 8 researched sources for Seattle. Before tax. Real quotes vary with site conditions.
📈Price Momentum
Year-over-year~1 year ago
$1,281
Today
$1,335
Sump Pump Installation in Seattle is ↑ 4.2% compared to roughly a year ago — about $54 more on the average project.
Comparison derived from the year-over-year change rate, not a month-by-month price index. We don't store historical snapshots yet — when we do, this will become a real time series.
🏢Top Sump Pump Contractors in Seattle
Verified providers2 Sons Plumbing & Sewer
2208 NW Market St #316a, Seattle, WA 98107, USA
4,050 reviews
Bee's Plumbing and Heating
2401 SW Alaska St, Seattle, WA 98106, USA
3,724 reviews
Provider data sourced from public business directories. Ratings and reviews are public and may change. LookupCost is not affiliated with listed providers.
💬What People Actually Paid
Community❓Common Questions
Yes, plumbing permits in Seattle are administered by King County Public Health. For 2026, the base fee is $132 plus a $26 per-fixture charge, typically totaling around $165-$191 for a standard installation.
Seattle's high seasonal rainfall and glacial till soil often require higher-capacity 1/2 HP pumps rather than 1/3 HP models. Additionally, cutting through common concrete basement floors in older Seattle homes can add $1,500 to $3,000 to the project cost.
Submersible pumps, preferred for Seattle's wet climate due to their power and quiet operation, cost between $150 and $500 for the unit. Pedestal pumps are cheaper at $80 to $250 but are less effective for high-volume water management.
Given Seattle's occasional winter storm power outages, many contractors recommend a battery backup system. This typically adds $600 to $1,200 to the total installation cost, including the secondary pump and specialized battery.
📊Our Methodology
How we collect dataAggregated from 8+ verified web sources and cost databases
Licensed contractor estimates and regional cost guides
Government construction and labor statistics
Community-reported project costs and reviews
Last data collection: 3 weeks ago. Updates run weekly. All costs in USD.
About this data
Cost figures are estimates synthesized from public market data using AI research and refreshed regularly. Real project costs vary by scope, materials, contractor, and site conditions. Always get verified quotes from licensed contractors for your specific project.
Spotted bad data? Let us know — we'll review and update.