Basement Finishing in DC, Maryland & Virginia
Turn your unfinished basement into real living space. Cornerstone Builders & Design transforms basements into entertainment rooms, home offices, guest suites, gyms, and more — adding usable square footage and serious value to your home.
What We Do
Full basement build-outs, framing and drywall, flooring installation, bathroom additions, wet bars, home theaters, egress windows, lighting design, and HVAC extensions. We also handle waterproofing and moisture management to protect your investment.
Popular Builds
Home theaters with surround sound, in-law suites with full kitchenettes, game rooms, home gyms, wine cellars, and dedicated home offices. Every build is customized to how you actually want to use the space.
What to Expect
Start with a free consultation where we evaluate your basement’s condition and discuss what’s possible. Most basement finishes take 4–8 weeks. We handle permits, inspections, and provide a detailed estimate upfront — no surprises.
Get Your Free Estimate
No obligation. Response within 24 hours.
Licensed & Insured • Lifetime Warranty