The Mark of Excellence
for over 30 Years.

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Home Design-Build in Maryland, DC & Virginia

At Botanical Decorators, our passion for residential landscape design has also often translated into custom construction projects—such as our outdoor patios, porches, and pool houses that often gain recognition throughout the D.C. area. As our company has grown to include more projects with both landscape and architectural elements, we’ve opened a separate design-build firm to focus on home construction of truly award-winning quality: Cahill Design Build.

Through Cahill Design Build we offer a comprehensive service for luxury residences throughout Maryland, Virginia, and Washington, D.C.—including exteriors, interiors, additions, and remodeling. Visit our sister site for more information or give us a call to get your home looking its best—inside and out—at 202-363-4626!

Maryland, Washington, D.C. & Virginia Design-Build by Our Sister Company

Our design-build service is fully comprehensive—meaning we can handle all aspects of home construction to ensure the end result is picture-perfect. This may include:

  • Design
  • Architecture
  • Construction
  • Interior finishes – custom built from our own mill shop!
  • Electrical, plumbing, and HVAC details

We focus primarily on:


It’s our exterior renovations that initially brought us recognition for extraordinary design-build—which is why we continue to offer many components of outdoor design-build through Botanical Decorators as well as Cahill Design Build. Our specialty is in extending your living space with structures like:

  • Patios
  • Porches
  • Garages
  • Pergolas
  • Pool houses
  • And more!



We build home additions of the finest quality to help clients throughout the D.C. area extend their living spaces with:

  • Sunrooms
  • Screened porches
  • Kitchen additions
  • Two-story additions
  • Guest rooms
  • And more!

Kitchen & Bath Remodeling

Cahill Design Build remodels kitchens and bathrooms in Maryland, Virginia, and Washington, D.C. to improve efficiency and enhance the aesthetic based on each client’s unique goals and lifestyle. This can involve simple upgrades—like cabinet or countertop replacements—or full remodels to completely revitalize the existing layout.



We want to ensure that all aspects of your design-build project are taken care of from start to finish. We maintain our own mill shop which enables us to create entirely custom interior finishes with timeless architecture tailored to your vision. From custom cabinetry to custom windows and beyond, we can create the interior finishes you want to your exact specifications and expertly install them to seamlessly blend in with the remainder of your home.

As part of our interior design service, we can also handle space planning, lighting design, and more.


About Cahill Design Build

Cahill Design Build emerged after we experienced tremendous growth with Botanical Decorators. As our landscape design firm grew, it became just as known for its custom construction work as its other services. So when our best clients suggested we open a separate design-build firm to provide even more services, we were happy to follow their advice.

Our first project consisted of an addition and kitchen renovation worth over a quarter million dollars—and the results were simply extraordinary. Word spread and through the support of our loyal clients who appreciate our unique passion for design-build and a team of the industry’s finest talent, Cahill Design Build has continued to grow and gain recognition, already gaining national awards for our work.

For more information on custom design-build services in the D.C. area, visit our sister site at

Our Service Areas

At Botanical Decorators, we provide pool design services and other landscape design to areas throughout Washington, DC, Maryland, and Northern Virginia. More specifically, we provide services in Maryland to residents of Annapolis, Ashton, Bethesda, Chevy Chase, Clarksburg, Clarksville, Columbia, Darnestown, Ellicott City, Gaithersburg, Glenwood, Potomac, Rockville, Sandy Spring, Silver Spring, and Urbana. In Northern Virginia, we offer our services to residents of Alexandria, Arlington, Fairfax, Falls Church, Great Falls, McLean, Reston, and Vienna. We also serve all of Washington, DC.


The information on this website is for informational purposes only; it is deemed accurate but not guaranteed. It does not constitute professional advice. All information is subject to change at any time without notice. Contact us for complete details.

Read our Reviews on Houzz. 4 stars from 5 reviews.


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Botanical Decorators
5011 Olney Laytonsville Rd, Ste B, Olney, MD 20832