Home Remodeling & Renovations
Basement Finishing and Basement Remodeling in Portland, OR
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. Moisture management comes before design: we assess drainage, grade, and vapor control, then specify moisture-resistant assemblies at the slab and rim.
Basement renovations built over a damp slab fail no matter how good the finishes are, and that is especially true in older homes with original foundations.
Once the space is dry, we build legal living space: egress, ceiling height, insulation, and mechanical relocation planned together. Whether the plan is a family room, a quiet home office, a guest suite, or adding a bathroom downstairs, the finished basement meets current building codes and is permitted and inspected — not a gray-area conversion.
Basement remodeling Portland homeowners can rely on starts with that permitted, inspected foundation.
Basement finishing Portland homeowners actually use means a room that feels like the rest of the house. That means real ceiling height, warm floors, daylight at the egress window, and a guest suite that guests are happy to sleep in.
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.
Basement finishing cost in Portland
A finished basement with a bathroom typically runs $60,000 to $150,000 in the Portland metro. A simple family room with no plumbing sits near the bottom. A full suite with a bath, a wet bar, and new egress sits at the top.
Four items move the number more than finishes do. Egress windows mean cutting the foundation wall, framing a well, and waterproofing the opening, which usually adds $6,000 to $12,000 per opening.
Moisture management is the second. Perimeter drainage, sump work, grade correction, and vapor control can add several thousand dollars before a single wall goes up.
Plumbing is the third. A basement bath below the sewer line needs an ejector pump and a pit cut into the slab. Ceiling height is the fourth, and the hardest: if headroom is short, lowering the slab is major structural work and changes the budget category entirely.
- Drywall: moisture-appropriate wall finishes, taping and paint after rough-in inspections.
- Insulation: foundation-wall and rim-joist assemblies selected after moisture is assessed.
- Ceiling: framing or finishing around ducts, beams and required clearances.
- Flooring: slab preparation, vapor control and a durable finished surface.
- Egress: foundation opening, window, well, drainage and waterproofing for a legal bedroom.
- Bathroom rough-in: drain and supply lines, venting and an ejector system if gravity drainage is not possible.
How to finish a basement on a budget
Start with a dry, usable plan rather than an expensive floor finish. Test the slab and walls for moisture, check the ceiling height and map the mechanical equipment before choosing a layout. If drainage or headroom needs major work, address that first. Covering a water problem with drywall is not a savings plan.
Keep the open family-room area simple and put enclosed rooms where existing windows make sense. A bedroom requires legal egress, so compare the cost of cutting a new opening against a layout that uses an existing suitable location. If a bathroom is optional, leave it out of the first phase rather than installing plumbing you do not need.
Choose durable, straightforward surfaces and spend where the assembly matters: insulation, ventilation and vapor control. Keeping ductwork and plumbing near their current runs can reduce framing and rough-in costs. We show those tradeoffs as separate line items so you can decide what belongs in this project and what can wait.
Use the planning range in our estimator, then get a site-specific price after the basement is measured.
Egress, permits and code for Portland basements
Any basement bedroom needs a code-compliant emergency escape opening. Portland follows the state code: a minimum net clear opening, a maximum sill height above the floor, and a window well sized so a person can climb out.
Ceiling height is the other gating item. Habitable basement space needs the minimum clear height under finished framing, measured after the floor assembly and any dropped ducts.
Finishing a basement is permitted work. Drawings, structural details for the egress opening, and electrical, plumbing, and mechanical permits go to Portland BDS, or to Clark County and the City of Vancouver on the Washington side.
We prepare the drawings, submit them, answer plan-review comments, and schedule every inspection. You do not deal with the permit counter.
Finished basement before and after in Portland homes
Most Portland basements start the same way: a bare slab, exposed joists, an old furnace in the middle of the room and one small window. Many older homes also have a damp corner or two.
After a finish, the same space reads as part of the house. Moisture is handled first, mechanicals are moved or boxed in, and ceilings are framed as high as the structure allows.
A typical result is a family room, a bedroom with a proper egress window, and a full bath. Some owners add a wet bar or a separate entry for a future rental.
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.
From the Field
Recent Work
Where We Build
Areas We Serve
See every neighborhood we build in on our Portland Metro service areas map.
Client Reviews
What clients say
A new room was built along with deck and patio, in place of covered deck. Chris and his team always responded and stayed on budget, went above and beyond with meeting our needs, with quality finishes on all levels. Simply couldn't be happier with the outcome. Definitely recommend them.
Sreepallavi T.
Portland, OR · Room addition, deck and patio
Finally got around to doing the guest bathroom reno after the master bath last summer and I could not be happy enough! Our previous contractor had changed states, but a friend referred Masters and our remodel was perfect from start to finish.
Denis M.
Portland, OR · Primary and guest bathroom remodels
I recently had my bathroom remodeled by Masters Construction, and I couldn't be happier with the results! They did an incredible job communicating each step of the process, ensuring I was always in the loop about timelines and what to expect.
Zack Turner
Portland, OR · Bathroom remodel
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