Basement Finishing Cost in Portland (2026)
Average cost in Portland
US$15,810 — US$150,000
US$25 — US$150 per sq ft
Cost Breakdown
ItemizedFraming, drywall, flooring, and fixtures
45%
Skilled trades (electrical, plumbing, carpentry)
40%
Architectural plans and interior design
10%
City of Portland building and trade permits
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 8 sources and market data for Portland. Actual costs may vary depending on specific project requirements.
📈Price Momentum
Year-over-year~1 year ago
US$57,955
Today
US$60,563
Basement Finishing in Portland is ↑ 4.5% compared to roughly a year ago — about US$2,608 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 providersMetke Remodeling & Luxury Homes
17428 SW Ferry Rd, Lake Oswego, OR 97035, USA
53 reviews
Catalyst 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
Homeowners in Portland can expect an ROI of 60% to 75%. Finished below-grade space is typically valued at 50% to 70% of the value of above-grade living area in local appraisals.
Installing a legal egress window, which is required for any basement bedroom, typically costs between $3,500 and $6,000 per window, including excavation and well installation.
Yes, many Portland homes have elevated radon levels. A radon mitigation system typically adds $800 to $1,500 to the project cost and is highly recommended during the finishing process.
Basic building permit fees range from $300 to $1,200, but total permit costs including electrical, plumbing, and the Oregon 12% state surcharge often reach $1,400 to $2,000 for mid-range projects.
📊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: 2 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.