Basement Finishing Cost in Portland (2026)
Average cost in Portland
US$15,810 — US$190,000
US$25 — US$150 per sq ft
Cost Breakdown
ItemizedSkilled trades and general contracting
40%
Drywall, flooring, framing, and fixtures
30%
Bathroom additions and panel upgrades
15%
Waterproofing and code-compliant windows
8%
City of Portland structural and trade permits
4%
Unexpected repairs in older homes
3%
None at 0%
📋What's Included
ScopeTypically Includes
- Framing & drywall
- Basic flooring (LVP or carpet)
- Electrical (outlets & lighting)
- Egress window (if required)
- Painting
- Basic bathroom rough-in
Typically Excludes
- Full basement bathroom
- Built-in bar or kitchen
- Home theater wiring
- Waterproofing (separate cost)
- Permits & inspections
Assumes an unfinished basement with existing concrete floor and basic utilities.
🧮Estimate Your Cost
InteractiveEstimated Cost
US$28,104 — US$42,156
Based on 9 sources and market data for Portland. Actual costs may vary depending on specific project requirements.
📈Price Momentum
Year-over-year~1 year ago
US$55,951
Today
US$59,084
Basement Finishing in Portland is ↑ 5.6% compared to roughly a year ago — about US$3,133 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 Basement Finish Contractors in Portland
Verified providersCatalyst Construction & Kitchen Remodeling
825 NE 20th Ave A, Portland, OR 97232, USA
57 reviews
Lamont Bros. Design & Construction
18675 Willamette Dr, West Linn, OR 97068, USA
97 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
In 2026, adding a full bathroom to a basement in Portland typically costs between $6,960 and $17,400, depending on the proximity to existing sewer lines and the need for a sewage ejector pump.
Homeowners should budget between $1,200 and $2,000 for standard building permits. Portland also applies a 12% state surcharge on all trade permits (electrical, plumbing, mechanical).
For a mid-range finish including upgraded lighting and a bathroom, Portland contractors are quoting between $50 and $85 per square foot in 2026.
Installing a code-compliant egress window, which is required for any basement bedroom, typically costs between $3,500 and $6,000 per window, including concrete cutting and window well installation.
Portland labor rates are approximately 15-20% higher than the national average due to strict licensing requirements and high demand. Additionally, older Portland homes often require structural reinforcement or moisture remediation costing $2,000-$8,000.
📊Our Methodology
How we collect dataAggregated from 5+ 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: 1 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.