Home Additions & Basement Renovations in DC & Northern Virginia

Rear additions, expansions and finished basements, designed and built to feel like they were always part of the house.

When a home no longer fits, adding space is often better than moving. Design Insight LLC designs and builds home additions and basement renovations in Washington, DC and Northern Virginia, with design and construction handled by one team from feasibility through final inspection.

Additions

We plan rear additions, second-story and side additions, family rooms, primary suites and kitchen expansions. Every addition starts with feasibility: zoning and lot-occupancy limits, structural approach, historic district review where it applies, and how the new space connects to the existing house so it looks and works like it was always there.

Basement renovations

Basements are some of the most valuable square footage in DC rowhouses and Northern Virginia homes. We finish and renovate basements for family rooms, guest suites, gyms and home offices, and plan the work that makes a basement comfortable: waterproofing and drainage, egress, ceiling height and mechanical layout.

What we handle

Feasibility, zoning review and design
Structural engineering coordination
Permits and inspections in DC, Arlington, Fairfax and Alexandria
Waterproofing, egress and mechanical upgrades
Construction, scheduling and project management

Why design-build for additions

Additions involve more coordination than almost any other residential project: designers, engineers, permitting authorities, neighbors and multiple trades. Our founders managed complex projects at Clark Construction Group, and we bring the same disciplined scheduling and cost control (PSP, CCM) to every addition.

Start with a complimentary consultation

Tell us about your home and your goals. We respond within 48 hours.

Book a Consultation