21 Century Home Services | Serving Virginia, Maryland, and the District Of Columbia

Home Additions and Extensions Custom Builder

Planning, Budgeting, Estimate

The excitement you will feel when stepping into your new room addition for the first time at home will be priceless. Enjoying the new space should be your main objective and we’ll work closely with you to take care of the rest in making the plan-design-build phases as seamless and stress-free as possible. We love our work, our clients, have over 30 years of experience and take great pride in our craftsmanship.

A new home addition project is no easy task. No construction project is ever “straight forward”. There are many important and critical factors that must be considered, and having an experienced team by your side that can help answer all those questions is key. Not taking the time to truly understand your project and what’s involved can result in a costly oversight in the long-run. 

But luckily you’re here and we’d love to help get you started on this exciting journey! Simply fill out the form to the right (or below) in order to connect with our team. Let’s get started.

Free Consultation

Raising a family and building memories

family of four holding hands and walking through a pier on the beachWe all love our homes and don’t want to think about ever moving from them. This is a natural feeling for all of us. It’s where we have raised our children, created lifelong memories and have enjoyed beautiful moments and a few sad ones as well. Adding a room to your home or improving your existing space can be a rewarding endeavor. No journey is ever easy, things always comes up and building a new addition or adding an extension to your house is no different. Owning and maintaining a home is also considered a journey, and one that should always be enjoyed with the same energy and care you have put into raising your family and career.

Whether you’re planning to add a second story, new office space, a new sunroom, a family room or simply just building a new garage, we’d love to be part of this journey and along side you and your family to make this dream come true. We’d love to play even a small part of those special memories you’ll inevitably be creating through this process.

Types of home additions and home extension services we offer
  • Home Additions
  • Garage Additions
  • Sunroom Additions
  • Room Additions
  • Porch Additions
  • Second Story Additions
  • Family Room Additions
  • Room Extentions
  • Bedroom Extensions
  • Bedroom Additions
  • Living Room Extensions
  • Office Space Additions
  • Bathroom Extensions
  • House Extensions
  • Sun Room Extensions

Building Home Additions in Northern Virginia, Maryland & Washington DC

Design Build provides homeowners with a single point of contact for both the design and construction phases of a project. One party is responsible for all aspects, from estimates, assessments and pre-construction to architecture, schematics, engineering, subcontracting, construction and post-construction. This entity, manages all contracts with subcontractors, equipment vendors and materials providers.

Our design build experts offer full residential service to the Washington DC Metro area, as well as Arlington, Alexandria, Fairfax, Herndon, Manassas, Ashburn, Sterling, Springfield, and Falls Church in Virginia; Gaithersburg,  Rockville, and Bethesda in Maryland.


Home Additions and Room Additions Gallery

Home Addition or Extension?

Not certain whether you should add a new room or extend an existing space? No problem, let’s take a look and see how we can help. All families have different needs and houses all have different kinds of resources available (or not) to them. Our goal here is to help you consider different scenarios that can make the decision process easier. By the way, if you’d like to have one of our team members come out and personally discuss your project and ideas, we’d love to! Simply fill out the form above or call us.

Consider where you and your family spend most of their time at home. For most home owners this is downstairs or first floor (considering you have a two story house). Let’s talk about this first floor. If you have a beautiful open kitchen with a breakfast area, a nice size living and dinning room, and even a one or two car garage, then maybe what you’re missing is a family room or sunroom extension. Consider for a moment what each of these rooms will feel like for you and your family.

If you have young children and want to continue to create beautiful moments and memories, then extending the first floor by adding a family room may give you the space you want. Keep in mind this will also take space away from your backyard (exterior). So then the question becomes, how much time out of the year do you and your family spend outside in the backyard? Only you can answer this.

Most people prefer to sacrifice part of their backyard and have a family room they can use almost daily and specially on weekends, family gatherings, and during winter while watching movies with the family feeling cozy.

Home Additions

Home additions offer a variety of benefits. Expanding your home with a second floor can provide extra space for a growing family. Entertainment space and improved flow can be great for Social Gatherings. A new garage will keep your vehicles protected from the elements. 21 Century Services has the experience and capability to design and construct the home additions of your dreams.

the exterior of a house showing a two car garage home additions