Basement Finishing Cost in Portland (2026)
Average cost in Portland
US$15,810 — US$190,000
US$32 — US$150 per sq ft
Cost Breakdown
ItemizedSkilled trades and general contracting
45%
Framing, drywall, flooring, and finishes
35%
Sump pumps, vapor barriers, and drainage
10%
Mechanical, Electrical, and Plumbing
5%
City fees and architectural plans
5%
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 10 sources and market data for Portland. Actual costs may vary depending on specific project requirements.
📈Price Momentum
Year-over-year~1 year ago
US$61,908
Today
US$65,375
Basement Finishing in Portland is ↑ 5.6% compared to roughly a year ago — about US$3,467 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
90 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
Homeowners in Portland can expect an ROI of 60% to 75%. On average, this adds approximately $700 in home value for every $1,000 spent on the project.
Yes, if the basement includes a bedroom, Oregon Residential Specialty Code Section R310 requires an egress window with a minimum 5.7 sq ft clear opening and a sill height no more than 44 inches above the floor.
Permit costs typically range from $1,453 to $1,729 for a standard project. Portland requires separate permits for building, electrical, plumbing, and mechanical work, with fees often based on the total project valuation.
Due to high annual rainfall, moisture management is critical. Professional waterproofing solutions like perimeter drains and foundation sealing typically add $5,000 to $25,000 to the total project cost.
📊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: 4 days 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.