Basement Finishing in Portland, OR
Turn unused basement space into bedrooms, a family room, or a rentable unit.
Quick Answer
Masters Construction finishes basements in Portland and Vancouver, WA — bedrooms with legal egress, baths, family rooms, and basement ADUs. Moisture and drainage are assessed and addressed before framing begins. Licensed in Oregon (CCB #248237) and Washington.
Portland basements are some of the cheapest square footage you can add to a house — if moisture is handled first. We assess drainage, grade, and vapor control before a single stud goes up, because a basement remodel built over a damp slab fails no matter how good the finishes are.
Once the space is dry, we build legal living space: egress, ceiling height, insulation, and mechanical relocation planned together so the finished basement is permitted and inspected, not a gray-area conversion.
Scope of Work
What’s Included
Moisture assessment & vapor control
Drainage, grade, and vapor barriers evaluated and corrected first.
Framing & insulation
Walls and rim joists detailed for a warm, dry, quiet level.
Egress windows
Code-compliant openings cut, framed, and waterproofed for legal bedrooms.
Basement bathrooms
Plumbing run, pumped where needed, and fully waterproofed.
Family & media rooms
Sound control, lighting layers, and built-ins planned into the space.
Basement ADUs
Separate entry, kitchen, and utilities for an independent unit.
Permits
Drawings, submittal, plan review, and inspections handled for you.
How It Works
Our Process
- 1
Consultation & site walk
We walk the home with you, measure the existing structure, and talk through goals, budget range, and timing before anything is drawn.
- 2
Design & engineering
Our in-house studio produces plans and 3D views, and our structural team engineers the framing, foundations, and systems behind them.
- 3
Permits & pricing
We prepare and submit the permit package, answer plan-review comments, and lock a detailed, line-item price against the approved set.
- 4
Build & walkthrough
One Masters project lead runs the trades, schedules inspections, and finishes with a punch walkthrough before handing the space back.
Where We Build
Areas We Serve
See every neighborhood we build in on our Portland Metro service areas map.
Frequently Asked
Basement Finishing FAQs
What Portland and Vancouver homeowners ask before they begin.
Basement finishing isn't a published line item — egress windows, ceiling height, moisture work, and whether a bath is added all move the number, so we price it after the site walk. See our Portland remodeling cost guide for detailed ranges.
Start Your Basement Project
Tell us about the home and we’ll walk the site, talk through scope, and give you a realistic range — no obligation.
CCB #248237 · Licensed in Oregon & Washington