MAC design + build is an award winning, full-service design/build firm specializing in residential remodeling and custom homebuilding for homeowners throughout Northern Virginia. Our remodeling specialties include design and build-out for kitchens, bathrooms, additions, patios and decks, and custom homebuilding.


Are you living in a community and location you love, yet feel like you’ve either outgrown your current home or desire to add more space? There is no need to relocate; let MAC design + build make your existing home ideal.

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As the "heart of the home" your kitchen is the room where family and friends gather. Remodeling your kitchen will add new life to your home, or allow you to upgrade from "builder-grade" cabinets, countertops and appliances, not to mention enhance your resale value in the future.

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Your bathroom should be your sanctuary and reflect the style you’ve so lovingly infused into the rest of your home. Imagine a heated floor or towel racks, inlaid tile flooring, natural stone and recessed dimmer-controlled lighting. That’s the way to truly relax and enjoy your master bath.

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MAC design + build is a leading builder of custom single-family homes in Northern Virginia, as well as a remodeler for existing homes.

We specialize in new home design and construction.

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The outside of your home should be as beautiful and functional as the interior, and it can be with a custom deck or patio. Enjoy family and friends on your own private oasis that extends your living space into the natural surroundings of a beautifully landscaped garden.

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We also handle smaller projects for clients as our schedule allows. These projects have included, but are not limited to: foyers, dormers, laundry or craft area renovations, full or partial landscaping and pools. If you envision a change in your home, just ask us.

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One Team Under One Roof

Everybody at MAC design + build, from the owners to the architects to the construction clean-up crew is on the same team – your team. We are all accountable for meeting your expectations.


  • Christian B.1/12/2022

    I have enjoyed working with Derek on numerous occasions over the past few years. I would definitely consider referring folks to Mac Design in the future for anything from custom... read more

    Liz W.6/23/2020

    Derek and the MAC team are incredible. We are in the beginning stages of the project and have had a terrific experience! Derek is creative, dependable and has moved... read more

    Brad H.7/09/2021

    Derek Leiter (Owner) and Justin (Project Manager) are outstanding individuals to work with. When I decided I wanted to finish my basement it was important to me to work... read more

  • anthony l.7/28/2021

    I am very pleased with the service provided! Not only did they take the time to ensure that my specific requests were met, but they used quality materials and the... read more

    Cheryl D.4/25/2021

    Wonderful people. I love my windows!

    Sylvia I.7/03/2021

    Deciding to gut your existing kitchen is a big decision, but in today’s real estate market, especially here in Ashburn, it’s worth the time and expense to update the most... read more

  • Nova S.2/11/2020

    I am the Outside Sales Rep for Nova Stone Center - Ashburn. I have had the pleasure of working with MAC Design+Build. They are amazing at what they do. They... read more

    Robin L.3/15/2021

    Justin and Derek were awesome! We remodeled our kitchen and 3 bathrooms. From the initial design to the end of construction MAC was professional and provided great customer service.
    WE LOVE...
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    Angie's L.2/06/2020

    When seeking a design firm to remodel our large outdated kitchen, we searched for a company that would create a unique and dramatic outcome. The design was complicated and required... read more

  • Clark A.9/28/2020

    We worked with several of the MAC staff on a custom home design and land consulting. They are a top notch team from the first email. Always working like it... read more

    Lance L.12/20/2021

    The MAC crew did a great job designing my custom golf simulator. I especially appreciate Justin O’Connell’s responsiveness to this complex project .

    Angie's L.1/29/2020

    It was fantastic. They were awesome and very highly recommended. They were accurate, fast, efficient and it was cost-effective.

  • Brian S.5/06/2022

    My wife and I were considering building a basement, and met with a number of different companies. Justin O'Connel, MAC's architect, met us as part of the initial conversations and... read more

    CoCo F.11/12/2020

    Worked with Justin at MAC for his assistance with flooring install. He was amazingly helpful in finding the right flooring I asked for and at a great price! He also... read more

    Kathleen R.5/08/2022

    This review is based solely on the feasibility study as I have yet to work with this company on a project. I requested a formal estimate from MAC for... read more