Hannegan Construction is a locally owned and operated residential whole-home remodeling company serving our neighbors in DC and Northern Virginia.
If you’re feeling cramped in your current home but don’t want the cost or disruption of building upward, a basement addition offers one of the smartest and most efficient ways to expand your living space. Hannegan Construction specializes in designing and building basement additions that seamlessly blend with your home’s existing structure while giving you the extra square footage you need.
A basement addition is more than just digging and pouring concrete—it requires experienced planning, engineering, and construction expertise. Our team handles the entire process, from evaluating your property’s grading, soil conditions, and structural layout to securing necessary permits and designing a layout that aligns with how your family lives. Whether you want extra bedrooms, a home office, a workshop, storage space, or a full lower-level suite, we create basement additions that are functional, durable, and fully integrated with your home.
Because these projects occur below grade, proper waterproofing, drainage, ventilation, and insulation are critical. We use proven methods and high-performance materials to ensure your new space stays dry, comfortable, and energy efficient. With Hannegan Construction, you can trust that every detail—foundation work, framing, electrical, plumbing, and finishes—will be completed to the highest standard.
Our collaborative process keeps you informed at every step. You’ll work with a dedicated project manager who oversees scheduling, inspections, and communication so your project stays on track. The result is a thoughtfully designed basement addition that enhances your lifestyle and adds long-term value to your home.
If you’re exploring a basement addition as a way to increase your living space, Hannegan Construction can guide you from concept to completion. Contact us today to schedule a consultation and discover what’s possible beneath your home.
