Home Additions in DC, Maryland & Virginia
When you love your home but need more space, an addition is the answer. Cornerstone Builders & Design designs and builds room additions, second stories, bump-outs, and in-law suites that blend seamlessly with your existing home.
What We Do
Single and multi-room additions, second-story additions, sunroom conversions, in-law suites, garage conversions, and kitchen or bedroom expansions. We handle architecture, engineering, permits, and construction.
Our Approach
We match your home’s existing roofline, siding, and architectural style so the addition looks like it was always there. Our in-house design team creates plans that maximize your new space while respecting your budget.
What to Expect
A free in-home consultation to discuss your needs and review feasibility. We’ll walk you through design options, timelines, and provide a comprehensive estimate. Most additions take 8–16 weeks depending on size and complexity.
Get Your Free Estimate
No obligation. Response within 24 hours.
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