Skip to main content

Home Addition Construction

We create additions that feel like they were always part of your home — seamlessly integrated in design, scale, and detail.

When your home no longer fits your needs, moving isn’t the only option. A well-planned addition gives you the extra space you want while allowing you to stay in the neighborhood you love.

Why Homeowners Build Additions

Home additions are often the smartest way to achieve the lifestyle you want without the stress of relocating. Northern Virginia homeowners come to us to:

  • Expand kitchens — open layouts with more room for cooking, dining, and gathering
  • Create sunrooms — light-filled spaces that connect inside to out year-round
  • Add primary suites — private retreats with walk-in closets and spa-like baths
  • Accommodate multigenerational living — in-law suites designed for comfort, privacy, and accessibility
  • Build second stories — new bedrooms, laundry rooms, or bonus rooms without using up lot space
  • Enhance wellness and recreation — gyms, media rooms, and flexible family spaces that support modern lifestyles
  • Add bathrooms — reduce the morning rush with thoughtfully designed new baths or expansions of existing ones
  • Stay put and save — avoid moving costs while investing in lasting comfort and value

Home Additions Across Northern Virginia

Based in Vienna, VA, Commonwealth Home Design has been creating additions across Oakton, McLean, Arlington, Falls Church, Great Falls, and Reston for nearly 40 years. From family room expansions and primary suites to second stories and in-law suites, our additions are designed to add space, function, and value — while honoring the character of your home.

Why Homeowners Trust Commonwealth

Additions require expertise in both design and construction to ensure new spaces look and feel seamless. Homeowners trust Commonwealth because we deliver:

  • Architect-guided integration — additions designed to match the scale, character, and flow of your home
  • Creative problem-solving — from bump-outs to full second stories, we find ways to expand space without sacrificing style
  • Experience with complex projects — nearly 40 years designing and building kitchens, in-law and primary suites, and multilevel additions in Northern Virginia
  • Details that matter — natural light, proportion, and finishes that make new spaces indistinguishable from the original home

Your Home Addition Questions, Answered

How much does a home addition cost?

Costs depend on the size, type, and level of finishes. Adding a simple bump-out is a very different investment from a full second story or primary suite. We provide clear estimates and align scope and budget early in the process so there are no surprises.

What’s the timeline for a home addition?

Smaller additions may take a few months; larger projects, such as second stories or in-law suites, can take longer. We provide a detailed schedule before construction begins and keep you updated throughout the entire process.

How do you ensure an addition blends with the existing home?

Our in-house architects carefully study proportion, rooflines, window placement, and materials so your addition looks like it’s always been part of the house. Details such as trim, siding, and scale are coordinated for a seamless finish.

Do you manage design and construction?

Yes. As a true design/build firm, our integrated team handles everything — design, permitting, construction, and finishing touches — under one roof.

Our 3-Phase Design-Build Process

Initial Design

We start by listening to your vision, evaluating site conditions, and identifying zoning, easement, or environmental factors. Early sketches and renderings help shape design concepts and establish ballpark costs. Revisions are made until your needs, budget, and design priorities align.

Design Development

Once the direction is set, we refine the details. Our team of architects, designers, and long-standing subcontractors reviews plans and addresses potential challenges early. Kitchen and bath designers work with you on interiors, and structural engineering or zoning concerns are resolved. By the end of this phase, you’ll have a final design, complete documentation, and a confirmed project cost.

Construction

Permits are secured, specialty materials are ordered, and your project manager holds a pre-construction meeting to align everyone on-site. Construction progresses according to schedule, with daily oversight to maintain quality. Before move-in, you’ll complete a walk-through to confirm every detail.

Our commitment doesn’t end when construction does.

We return after one year for a complimentary tune-up, addressing any adjustments needed as your home settles.

(swipe to see more)

Love what you see?

“

My husband and I have never found a contractor better than Commonwealth…and we should know. Over the 25 years since Commonwealth put a major addition on our house in Herndon, VA, we have worked with at least 10 contractors in 4 different states. None could beat Kelvin and Susan, and most couldn’t even come close. We wish we could have convinced them to move with us every time we needed to do a home renovation or construction project

AH Waigand
“

Commonwealth did a great job on a major renovations for us. They did an addition for us which increased the size of our house by over 50%. When we were considering doing the work, we talked with several contractors. We went with them initially for a few reasons: they are owned by a married couple where one is an architect and the other is an engineer, so we knew that neither would get short shrift on our project. But also, they were the only ones who came in with a vision to meet our goals after listening to what we wanted. Everyone on their staff was helpful, and knowledgeable. The final product looks great, and is exactly what we hoped for. I waited a year after to write this review, and everything is still in great shape.

Josh Krupnick
“

My wife and I recently did a kitchen and bath renovation and we couldn't be happier with Commonwealth. They did exactly what they promised, on time and on budget. One of our big concerns was not having someone onsite daily but the Commonwealth team arrived every day to keep our project timeline intact. We were so impressed with Commonwealth we had their company build our kitchen cabinets for our renovation. They look amazing!

We would 100% recommend Commonwealth (and already have)!

Brandon Cook
“

Commonwealth completed a renovation for us a few years ago. As I was sitting in my kitchen this morning, contemplating another day inside with my family, I realized how grateful I am that I have such a beautiful space to wake up to every morning. It makes this whole social distancing thing a lot easier. We really love our new home. All the added space and light has made our lives so much better, and even more so now that we are all together at home for the foreseeable future. We highly recommend Commonwealth Home Design.

Laura Wilson

LIVE THE DIFFERENCE!

AWARD-WINNING HOME REMODELING DESIGN & SERVICE

Expertise.com Best Architects in Fairfax 2023
Northern Virginia Magazine Best Home Experts 2020
NARI CotY 2019 Awards
Home Builder Digest 2018 Best Residential General and Kitchen Remodeling Contractors in Washington D.C.

PROFESSIONAL HOME REMODELING AFFILIATIONS

Qualified Remodeler
remodeling
pro remodeler professional remodeler
AIA American Institute of Architects

Wondering If a Home Addition Makes Sense?

Read 8 Top Reasons for Building a Home Addition in 2025 to learn why expanding your home can be a smart financial move and a major lifestyle upgrade.

Schedule a Consultation

Serving These Communities in Northern Virginia

Commonwealth Home Design serves homeowners throughout Northern Virginia from our office in Vienna, VA. Every neighborhood has its own character and mix of home styles, and we bring the same thoughtful design and craftsmanship to each project. Explore our service areas:

Northern Virginia Major Home Addition Tips

Rollercoaster at night
Residential

The Home Remodeling Process Rollercoaster: What Northern Virginia Homeowners Can Expect

Home remodeling is exciting — and emotional. For homeowners in Vienna, VA, and throughout Northern…
NEW SCREEN PORCH ADDITION EXTERIOR AFTER
Architecture

8 Top Reasons for Building a Home Addition in 2026

In today’s housing market, a home addition is more than a strategic investment – it’s…
In law suite kitchenette
Architecture

Transform Your Home with Commonwealth’s In-Law Suite Expertise

Enhance Your Home with an In-Law Suite for Multigenerational Living At Commonwealth Home Design, we…
KITCHEN ISLAND & CABINETS AFTER
Architecture

Custom Contemporary Kitchen Remodel and Screen Porch Addition in Vienna, VA

Home Remodeling Project Overview In 2014, our clients purchased a newly built home in the…