Trusted basement finishing in Portland, OR since 2002
Your basement holds incredible potential. Whether you dream of a cozy home theater, a home office, a playroom for the kids, or even a rental suite, Cornerstone Builders specializes in basement finishing in Portland, OR that adds both comfort and real value to your home. For over two decades, we've helped homeowners throughout the Portland metro area turn dark, underutilized basements into stunning, livable spaces. Common challenges like moisture seepage, uneven floors, and lack of natural light are expertly handled during our process. We start by assessing your space’s unique conditions—Portland’s climate demands proper waterproofing and insulation—then design a layout that fits your lifestyle. From initial consultation to the final coat of paint, our dedicated team ensures every detail reflects our commitment to quality. Don’t let valuable square footage go to waste. Choose Cornerstone Builders for professional basement finishing in Portland, OR that you’ll love for years to come.
A finished basement can boost your property’s resale value by providing additional livable square footage that buyers in Portland actively seek.
Turn an unused area into a family room, home gym, guest suite, or hobby studio—without the cost of a home addition.
Our process includes thorough waterproofing and vapor barriers to protect against Portland’s damp climate, preventing mold and mildew.
Work with our designers to choose layouts, lighting, flooring, and colors that match your style and meet your specific needs.
Proper insulation and energy‐efficient windows keep your basement comfortable year‐round while lowering heating and cooling bills.
With 22 years of experience, our licensed team ensures every job meets code and exceeds expectations—backed by a solid warranty.
We visit your home, measure the space, discuss your vision, and provide a detailed plan and estimate tailored to your needs.
Any existing moisture issues are addressed with drainage, sump pumps, and vapor barriers to create a dry, safe environment.
We frame walls, install insulation and wiring, and run plumbing if needed—ensuring everything is ready for the finish stage.
Drywall, flooring, trim, paint, lighting, and any custom features are installed. We walk through the project with you to ensure 100% satisfaction.
The cost of basement finishing in Portland, OR depends on the size of your basement, the complexity of the design, and the materials chosen. A typical 1,000-square-foot basement ranges from $25,000 to $50,000. Factors such as adding a bathroom, installing egress windows, or upgrading to high-end finishes will increase the price. Our estimates are transparent—no hidden fees. We believe in providing outstanding value through durable materials and expert workmanship. Contact us for a personalized quote that fits your budget and vision.
For an exact quote tailored to your property, call ☎ for a free estimate.
“Cornerstone Builders turned our dark, damp basement into the best room in the house. The home office is bright and warm, and the process was seamless. Highly recommend!”
Schedule your free consultation with Portland’s trusted basement finishing experts. Get a custom design and a clear, upfront quote.
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