Northern Virginia's Trusted Home Builders, Remodelers & Commercial Construction Contractors
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Residential & Commercial Construction Experts Serving Northern Virginia & Washington, DC
For over 21 years, Cosmo Builders has helped homeowners, businesses, and government clients successfully build, renovate, remodel, and expand their properties. As a Class A Licensed Residential Building Contractor (RBC) and Commercial Building Contractor (CBC), we provide complete design-build, construction, remodeling, and project management services from concept to completion.
Whether you’re planning a kitchen remodel, home addition, custom home, office renovation, tenant improvement, restaurant construction project, or commercial build-out, our experienced team delivers accurate budgeting, reliable estimates, quality craftsmanship, transparent communication, and professional project management every step of the way.
One Team. One Process. Built Around Your Vision.
Trusted Residential, Commercial & Government Construction Experts Serving Northern Virginia
Why Choose Cosmo Builders?
What Sets Us Apart
- Class A RBC & CBC Licensed Contractor
- 21+ Years of Construction Industry Experience
- Accurate Construction Budgeting & Reliable Estimates
- Residential, Commercial & Government Construction Expertise
- Design-Build Project Delivery
- Dedicated Project Management
- Permit & HOA Coordination
- Architectural & Engineering Support
- Transparent Communication & Honest Pricing
- Organized Scheduling & Planning
- Quality Craftsmanship
- Code-Compliant Construction
- Warranty Protection
- We Deliver on Our Promises
Proudly serving homeowners and businesses throughout Fairfax County and Northern Virginia.
Residential Remodeling & Construction
Whether you’re updating your kitchen, expanding your living space, building a custom home, or planning a major renovation, Cosmo Builders provides expert remodeling, new construction, and design-build services tailored to your lifestyle, budget, and long-term goals.
From planning and budgeting to permits and construction, our team helps homeowners create beautiful, functional spaces built for the way they live today and for years to come.
New Home Construction & Design-Build
Build your dream home with confidence. Our design-build process combines planning, budgeting, design coordination, permitting, and construction under one team, creating a smoother experience from concept to completion.
Building custom homes throughout McLean, Great Falls, Fairtax, Alexandria, Falls Church, and surrounding Northern Virginia communities.
Recently Completed New Construction & Custom Home Projects in McLean Virginia
Kitchen Remodeling
Create a beautiful and functional kitchen tailored to your lifestyle. Our custom kitchen remodeling services combine smart design, quality materials, and expert craftsmanship to enhance everyday living and increase home value.
Providing kitchen remodeling services throughout Fairfax County and Northern Virginia.
Recently Completed Kitchen Remodeling Projects in Fairfax & Arlington
Bathroom Remodeling
Upgrade your bathroom with luxury finishes, custom tile work, walk-in showers, modern vanities, Tub, and efficient layouts. We create comfortable spaces that blend style, functionality, and long-term durability.
Providing bathroom remodeling services throughout Fairfax County and Northern Virginia.
Recently Completed Bathroom Remodeling Projects in Alexandria, Vienna & Great Falls
Home Additions & Whole Home Renovations
Whether you need more living space or a complete home transformation, our team specializes in seamless home additions, whole-house renovations, and structural improvements that enhance functionality, comfort, and property value.
Designing and building home additions in McLean, Great Falls, Fairfax, Falls Church, and Alexandria
Recently Completed Home Addition & Whole Home Renovation Projects in Woodbridge and Manassas
Home Additions, Garage Additions & Home Expansions
Need more space without moving? We help homeowners expand their existing homes with room additions, garage additions, second-story additions, and complete home expansions. Whether you’re adding square footage for a growing family, creating a larger kitchen, building a new primary suite, or adding an entire second floor, our team provides planning, design-build services, permitting, and construction management from start to finish.
Recently Completed Home Additions, Garage Additions & Second-Story Addition Projects Throughout Northern Virginia
PROJECTS FROM START TO FINISH
Real Projects. Real Results. Real Experience.
Each video showcases 3–5 completed Cosmo Builders projects, taking you from demolition and construction to the final walkthrough. See the real process, real craftsmanship, and real results that have earned the trust of homeowners across Northern Virgi
Helping Homeowners Build, Remodel & Expand With Confidence
From kitchen and bathroom remodeling to home additions, custom homes, and whole-house renovations, Cosmo Builders provides expert planning, reliable estimates, quality craftsmanship, and personalized project management. Proudly serving homeowners throughout Northern Virginia with construction solutions designed for lasting value and everyday living.
Looking for a Trusted Commercial Contractor in Virginia or Washington, DC?
Class A Licensed Commercial Building Contractor (CBC) for Office Renovations, Tenant Improvements, Restaurant Construction, Government Projects & Commercial Remodeling
Cosmo Builders helps business owners, property managers, developers, and government agencies successfully plan, budget, renovate, and build commercial spaces throughout Virginia and Washington, DC. With over 21 years of construction industry experience, our team delivers reliable estimates, organized project management, permit coordination, and quality construction from concept to completion.
Commercial remodeling services for offices, restaurants, retail stores, medical tacilities, and commercial properties throughout Northern Virginia and Washington DC., and commercial properties throughout Northern Virginia and Washington DC.
Office Renovations & Tenant Improvements
Create productive, modern workspaces with office renovations, tenant improvements, interior build-outs, conference rooms, and workspace reconfigurations. We help businesses maximize functionality while minimizing operational disruptions.
Serving property owners, developers, and businesses throughout Northern Virginia, Washington DC, and surrounding metropolitan areas.
Recently Completed Office Renovation & Tenant Improvement Projects in Fairfax, McLean & Arlington
Restaurant Construction & Commercial Remodeling
From restaurant build-outs and commercial kitchens to retail renovations and customer-facing spaces, our team delivers quality construction, permit coordination, and project management to help businesses open and operate successfully.
Recently Completed Restaurant & Commercial Remodeling Projects in Alexandria and Washington DC
Government Construction & Construction Management
Cosmo Builders provides construction management, facility renovations, and improvement services for government agencies, municipalities, educational facilities, and institutional clients. Our team focuses on planning, compliance, scheduling, safety, and reliable project delivery.
Recently Completed Government & Institutional Construction Projects Throughout the DMV Area and abroad.
Building Better Commercial Spaces Across Virginia & Washington, DC
From office renovations and tenant improvements to restaurant construction and government projects, Cosmo Builders delivers reliable budgeting, organized project management, code-compliant construction, and quality results. Proudly serving businesses, property managers, and government agencies throughout the DMV region.
About Cosmo Builders
Cosmo Builders is a licensed and insured Virginia Class A General Contractor serving homeowners, business owners, property managers, developers, and investors throughout Northern Virginia and Washington, DC.
Our team holds both Residential Building Contractor (RBC) and Commercial Building Contractor (CBC) license classifications, allowing us to manage a wide range of residential and commercial construction projects in accordance with Virginia licensing requirements.
With more than 21 years of construction and project-management experience, we specialize in:
- Custom Home Construction
- Home Additions
- Whole-Home Remodeling
- Kitchen & Bathroom Remodeling
- Basement Finishing
- Commercial Renovations
- Tenant Improvements
- Design-Build Services
- Construction Management
From the initial consultation and budgeting through design coordination, permitting, construction, inspections, and final project closeout, our team provides one coordinated point of responsibility from concept to completion.
Whether you're building a custom home, expanding your living space, remodeling your business, or planning a commercial build-out, Cosmo Builders is committed to delivering quality craftsmanship, transparent communication, and professional project management.
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Commercial Construction & Remodeling
Cosmo Builders provides design-build, commercial construction, tenant improvement, renovation, and construction management services for businesses and organizations throughout Northern Virginia and Washington, DC.
From office renovations and retail build-outs to restaurants, medical facilities, warehouses, multifamily properties, and commercial building additions, our team manages every phase of the project—from planning and estimating to permitting, construction, inspections, and final project closeout.
Whether you're modernizing an existing facility, expanding your business, or constructing a new commercial space, we deliver coordinated project management, quality craftsmanship, and solutions tailored to your operational goals, schedule, and budget.
Commercial Capabilities
- Commercial Interior Renovations
- Office & Tenant Build-Outs
- Restaurant & Retail Construction
- Medical & Professional Office Renovations
- Commercial Additions & Facility Expansions
- MEP & Exterior Improvements
- Design-Build Delivery
- Construction Management
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Design-Build Construction
Cosmo Builders delivers integrated Design-Build construction services that combine planning, design coordination, budgeting, permitting, construction, and project management under one experienced team.
By working with a single, coordinated team from concept through completion, clients benefit from streamlined communication, better project coordination, earlier planning for budget and constructability, and a more organized construction experience.
Whether you're building a custom home, planning a home addition, renovating an existing property, or completing a commercial construction project, our Design-Build approach helps transform ideas into well-planned, code-compliant, and professionally managed projects.
Design-Build Solutions
- Residential & Commercial Design-Build
- Feasibility Planning & Budget Development
- Architectural & Engineering Coordination
- Permit & Regulatory Coordination
- Construction Management & Quality Assurance
- Project Scheduling & Final Closeout
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Permitting, Planning & Code Coordination
Construction projects often require permits, agency approvals, and coordination with local building regulations. Cosmo Builders helps homeowners, business owners, property managers, and developers navigate the planning and permitting process for residential and commercial projects throughout Northern Virginia and Washington, DC.
Our team works closely with clients, architects, engineers, and local jurisdictions to support a smoother project from initial planning through final inspections. While every project has unique requirements, we help coordinate the documentation, approvals, and communication needed to keep construction moving forward.
Our Permit & Planning Support Includes
- Site Evaluation & Existing Conditions Review
- Planning, Budgeting & Pre-Construction Coordination
- Architectural & Structural Coordination
- Building Permit Application Support
- Building, Electrical, Plumbing & Mechanical Permit Coordination
- Zoning, HOA & Local Agency Coordination
- Inspection Scheduling & Code Compliance Support
- Certificate of Occupancy Coordination (when applicable)
Permit requirements, review timelines, inspections, and agency fees vary by project type and jurisdiction. Our team works to simplify the process by providing guidance and coordination throughout each stage of construction.
Helpful Resources
Renovation Help Center
Learn Before You Build
Planning a remodeling, addition, custom home, or commercial construction project? Access expert guides, local cost information, permit requirements, project timelines, design ideas, and construction insights to help you plan smarter and maximize your investment.
Whether you’re exploring options or ready to start, our Renovation Help Center provides trusted resources, real-world expertise, and practical guidance for homeowners and business owners throughout Northern Virginia and Washington, DC.
Residential Remodeling Hub
Explore remodeling guides, project costs, permits, design inspiration, and planning resources for bathrooms, kitchens, basements, home additions, and custom homes.
Commercial Renovation Hub
Access commercial construction guides, build-out planning, tenant improvements, budgeting resources, permitting information, and project development insights.
Special Building and Construction Warranty
Businesses and other organizations usually renovate their commercial buildings much more frequently than residences, but you still want to know that your project will be completed in a way that will hold up until you’re ready for that next expansion or upgrade. At Cosmo Builders, we build your commercial building or remodeling to last. That’s why we warranty all of our work for up to one full year. If you encounter any issues with our work – whether it be flooring, framing, electrical, or any other service we provide in the course of your project – we will fix it promptly. Our Special Commercial Building Warranty covers all parts, tools, materials, and labor to correct the issue. It gives you the confidence and peace of mind to allow us to manage all aspects of your project while you focus on your business or organization. When you hire Cosmo Commercial Builders for a commercial construction project or commercial renovation in Northern Virginia, you can rest assured that you are receiving top notch, error-free services.
Who We Serve
Cosmo Builders proudly partners with homeowners, businesses, developers, and organizations throughout Northern Virginia and Washington, DC. Whether you’re planning a residential renovation, commercial build-out, property improvement, or new construction project, our team provides customized construction solutions tailored to your goals, budget, and project requirements.
We proudly serve:
- Homeowners – Custom homes, home additions, remodeling, and renovations
- Business Owners – Office, retail, restaurant, and commercial construction
- Property Managers – Building improvements, tenant renovations, maintenance projects, and facility upgrades
- Real Estate Investors – Property renovations, value-add improvements, fix-and-flip projects, and rental property upgrades
- Real Estate Agencies & Brokers – Pre-sale renovations, property improvements, staging upgrades, and client construction support
- Developers – Residential and commercial construction, additions, and new development projects
- HOAs & Condominium Associations – Community improvements, common-area renovations, and building repairs
- Restaurants & Hospitality – Restaurants, cafés, bars, hotels, and hospitality renovations
- Retail Businesses – Retail stores, shopping centers, and tenant build-outs
- Medical & Professional Offices – Medical, dental, legal, financial, and professional office renovations
- Industrial & Warehouse Owners – Warehouse renovations, facility improvements, and commercial expansions
- Government Agencies & Public Organizations – Renovations, tenant improvements, facility upgrades, and construction management services
Featured Projects
Explore a selection of residential and commercial construction projects completed throughout Northern Virginia and Washington, DC. From custom homes and home additions to commercial renovations and tenant improvements, our portfolio reflects our commitment to quality craftsmanship, thoughtful planning, and professional project management.
Residential Construction
Custom Home Construction | McLean, VA
Design-build custom home construction tailored to each homeowner’s vision, lifestyle, and long-term investment goals, from planning and permitting through final construction.
Home Addition | Great Falls, VA
Custom home additions designed to expand living space while blending seamlessly with the existing home’s architecture and functionality.
Basement Remodeling | Fairfax, VA
Finished basements designed for additional living space, guest suites, home offices, recreation rooms, and multi-functional family areas.
Bathroom Remodeling | Alexandria, VA
Modern bathroom renovations featuring custom tile, walk-in showers, vanities, lighting, plumbing fixtures, and premium finishes.
Commercial Construction
Commercial Renovation & Government Projects | Arlington, VA
Commercial renovations, tenant improvements, government construction support, and public-sector renovation projects delivered with professional project management and quality control.
Commercial Addition & Building Expansion | Washington, DC
Commercial additions, facility expansions, tenant improvements, and building modernization projects designed to support long-term business growth.
Our Process
It’s easy to start a new construction or commercial renovation with us. Our process is simple and straight-forward as we take care of everything. You can rest easy and focus on your business while we take care of all the details of your construction or remodeling project in Northern Virginia.
We meet with you to understand every detail of what you want, determine the project scope and what your budget will allow us for materials and finishing products. A prospective budget for the project is prepared and reviewed with you.
Our team conducts an on-site “Q&A” session with subcontractors and suppliers. We coordinate our proprietary bid and proposal submissions for competitive pricing on your project.
With your input, we will help find your project the right architect who can produce construction documents for your project. By detailing the drawings, we prevent costly delays and unexpected surprises for you down the road.
Permits are a headache that you don’t have time for. Now you can have your permit applications underway, for construction or remodeling projects, through Cosmo Builders Permit Service representative.
A meeting takes place in our show room, or in your designer’s show room, where you view different options of products and finishing materials. You get to fully customize your project.
Timeline estimates are entered into our project scheduling tool. We know how long the project will take and can predict and avoid potential points of delay. Being on time is always our #1 priority.
We use sophisticated project management software to create a custom schedule for your project. We are able to pinpoint at any given moment what is happening on your project, and what will happen next.
Contact us today to get started with an estimate for complete construction services for your residential or commercial remodeling or new construction.
Specialty Construction
Cosmo Builders provides clients with the highest standards of workmanship, service, and support in the construction industry. We are versatile contractors and able to handle every service you need in the course of your residential or commercial construction or remodeling project in Arlington.
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Licensed, Certified & Recognized by Leading Industry Organizations
Client Reviews & Success Stories
Cosmo Builders proudly provides residential remodeling, home additions, custom homes, kitchen and bathroom remodeling, commercial construction, and Design-Build services throughout Northern Virginia and Washington, DC.
Google Reviews
100+ Verified Five-Star Reviews from homeowners and businesses.
Read ReviewsAngi Reviews
60+ Verified Homeowner Reviews for remodeling and construction projects.
Read ReviewsThumbtack Reviews
100+ Verified Customer Reviews highlighting completed residential remodeling and construction projects.
See ProjectsFacebook Recommendations
40+ Positive Recommendations shared by homeowners, businesses, and our local community.
Read Recommendations Where We Work
Areas We Serve
Cosmo Builders proudly provides residential remodeling, home additions, custom homes, kitchen and bathroom remodeling, commercial construction, and Design-Build services throughout Northern Virginia and Washington, DC.
Primary Service Areas
McLean, VA
Fairfax
Arlington
Alexandria
Falls Church
Vienna
Great Falls
Annandale
Springfield
Burke
Reston
Herndon
Bristow
Manassas
Manassas Park
Woodbridge
Washington, DC
Cosmo Builder Awesome Fact
21 Years Work
Experience in Project Management And Construction
96 Project completed
We have successfully delivered over 96 Commercial Project
6 ongoing Project
We are working on 6 projects now
500 satisfied clients
Satisfied Clients
