Major Home Additions in Northern Virginia

Architecture, engineering and construction for substantial additions and whole-home transformations.

A successful addition should feel as though it was always intended to be part of the home. K-One Design Build approaches additions as both architectural and structural projects—considering the existing building, zoning constraints, foundation and framing systems, roof geometry, mechanical systems, circulation, natural light and exterior composition before construction begins.

If you need a home addition, construction services are just a phone call away. Dial 888-327-5554 now to discuss your needs with a member of our staff.

TYPES OF ADDITIONS WE DESIGN + BUILD

Second-Story Additions

Two-Story Additions

Primary-Suite Additions

Multigenerational / In-Law Suites

Major Rear & Side Additions

Garage + Living-Space Additions

Whole-Home Expansion & Reconfiguration

Trust us to complete every step of your project, from creating a custom design to putting the finishing touches on your space.

Planning to add guest rooms, workspaces or living areas? Contact us today to schedule custom home addition services.

We made it easy to expand your square footage

Adding onto your home is a big project, but the pros at K-One Design & Build make the home addition construction process simple. We'll take care of every detail, including...


  • Architectural designs
  • 3D models
  • Structural modifications
  • Foundation work
  • Roofing work
  • Electrical and plumbing extensions
  • Interior finish work


Plus, we'll make sure your addition integrates seamlessly with the rest of your home. You'll have the extra space you need in no time. Request our home addition services in McLean, Vienna, Alexandria or Annandale, VA today.