Maryland's Trusted Outdoor Living Contractor
Custom sunrooms, decks, pergolas, and more, designed for how Maryland actually lives. Thirty years in, built by our own crews with to-the-penny proposals and no subcontracted middlemen.
Industry-Leading Partnerships
We're authorized dealers and certified installers for the industry's most respected manufacturers. That means premium materials, manufacturer-backed warranties, and factory-trained installation.
Trex Pro Platinum Contractor
Authorized Sunspace Dealer
Certified Azenco Installer
Authorized Alutech Awning Dealer
Trex Certified Installer
Dundalk LeisureCraft Partner
What We Build
From bright year-round sunrooms to custom decks designed for entertaining, we build outdoor spaces engineered specifically for Maryland's climate and your lifestyle.
Most PopularVinyl three-season rooms and fully insulated four-season sunrooms, custom-built. Authorized Sunspace dealer.
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Azenco louvered pergolas, motorized or fixed, plus fabric and solid-roof covers. Certified Azenco installer.
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Motorized retractable Alutech SunShield awnings with Sunbrella fabric and LED-lit arms.
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Open-air comfort with the bugs kept out. Our Sunspace screen rooms can upgrade to vinyl windows later.
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Add shade and protection to your existing deck. Engineered to support future sunroom conversions.
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Already have a covered porch? We fill it in with screens, windows, or glass to create a true outdoor room.
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Custom glass and polycarbonate greenhouses for a twelve-month growing season. Authorized Arcadia GlassHouse dealer.
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Trex Pro Platinum dealer. Low-maintenance composite decks designed to last decades, not seasons.
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Wood, vinyl, and aluminum fencing that complements your space and stands up to Maryland weather.
Learn MoreRecent Projects
Every project is custom-designed for the homeowner, the home, and the way they want to live outside. Here are a few recent builds from across our service area.
8+
Months of comfortable sunroom use in Maryland
Local Expertise
Maryland's four distinct seasons make it one of the best places in the country to enjoy a sunroom or three-season room. Here's why homeowners across Harford, Baltimore, and Cecil Counties are adding enclosed living space.
Maryland enjoys extended shoulder seasons with comfortable temperatures. A three-season room lets you soak in spring blooms and fall foliage without battling pollen, bugs, or unpredictable rain.
Our summers are hot and humid. A sunroom with proper ventilation or climate control gives you an outdoor feel with indoor comfort, no mosquitoes, no sweat.
Sunrooms and three-season rooms add usable square footage that Maryland buyers love. Industry remodeling studies report strong resale returns on sunroom and three-season additions, plus years of daily enjoyment.
Maryland's pollen seasons are brutal, and our mosquitoes are legendary. Enclosed sunrooms and three-season rooms let you enjoy the outdoors year-round without sneezing or swatting.
200+
Sunny days per year in Maryland
70%+
Reported sunroom resale ROI
5
Counties we proudly serve
30+
Years of outdoor living expertise
Our Process
With 30+ years of outdoor living expertise, we've refined a process that makes custom projects clear, predictable, and stress-free. Here's what working with us looks like.
Start with a free phone call where we learn about your space, your goals, and answer your initial questions. By the end of the call, we'll give you a price bracket so you have realistic expectations before any on-site visit. No pitch.
We come to your home for a one-hour design consultation. We take measurements, look at the space, bring material samples and color options, and discuss design ideas. Just an honest conversation about what's possible.
After the on-site visit, we develop the full scope of your project and give you a to-the-penny proposal. No vague allowances. No hidden costs. You see exactly what you're getting and what it costs, down to the dollar.
Once you approve the proposal, we handle everything: permitting and facilitation, engineering, materials ordering, scheduling, building, inspections, and final walkthrough. Our crew respects your home and your neighbors throughout the build.
Investment Guide
Every project is unique, but here's what homeowners typically invest. Use our pricing calculator to get a price in 60 seconds for your specific project.
Starting at
$20,000 to $80,000
Composite or wood, single or multi-level, with railings, stairs, and lighting. Trex Pro Platinum installation.
Starting at
$45,000 to $90,000
Enjoy spring through fall, vinyl glazing options, optional climate features. Authorized Sunspace dealer.
Starting at
$60,000 to $150,000+
Fully insulated year-round additions, premium glass options, finished interiors with HVAC.
These ranges are starting estimates based on typical projects. Final pricing depends on your specific design, materials, and site conditions.
Upload a photo and preview a retractable awning in seconds. Free, no obligation.
What Homeowners Say
Google ★★★★★•Facebook ★★★★★•Houzz ★★★★★•Thumbtack ★★★★★•Porch ★★★★★
"Excellent experience with Mark and Custom Design and Build. Website was easy to use. Mark took care of the permits and the survey which sped things along. The builders were also very friendly and got the job done quickly, even with the grading. Highly recommend CDB!!!"
Daniel Sanborn
Verified Google Review
"Great company. Communication was amazing. We will refer them to everyone."
Rick Studley
Verified Google Review
"It was a pleasure working with Mark, Viola, and the entire team. All phases of the project from the initial phone contact to project completion were executed professionally and timely. We started with a wooden deck and screened enclosure that was rarely used and ended up with a beautiful composite deck and sunroom that we enjoy daily. We greatly appreciate the skilled craftsmen and specialty tradesmen brought into the project. We now have an additional living space to enjoy for years to come!"
Deborah Thomas, Rosedale, MD
Verified Google Review
"Custom Design & Build did a superb job on restoring my deck. The finished product exceeded my expectations. I am considering Custom Design & Build for future remodeling projects on my home."
Laverne Teshome, Forest Hill, MD
Verified Google Review
"We had a fantastic experience working with Mark Szabo and his team. Our deck of 35 years needed to be replaced and he came highly recommended. Mark was incredibly patient, walked us through every step of the process, and delivered a dream deck that exceeded our expectations. Communication was clear and consistent, and the deck was completed ahead of schedule and in less than a week's time. His crew was hard working, meticulous, and very respectful to us and our neighbors."
Marsha Cole
Verified Google Review
"Mark was fantastic to work with from start to finish. He's incredibly knowledgeable and took the time to explain everything clearly, which really put us at ease. The entire experience was smooth, professional, and exceeded our expectations. You can tell he takes pride in what he does, and it shows in the quality of his work and the way he treats his clients. Highly recommend Mark and his team if you want the job done right!"
Brandon Herd
Verified Google Review
Three-season room image coming soon
Financing Available
Most of our clients use financing to spread their investment over up to 15 years instead of paying upfront. We work with trusted lenders who specialize in home improvement projects, with approval often within minutes and 0% interest options available for qualified buyers.
Where We Build
Headquartered in Fallston, MD, we serve homeowners across central Maryland.
Bel Air, Forest Hill, Fallston, Aberdeen, Havre de Grace, Joppa, Edgewood, Jarrettsville, Whiteford, Pylesville
Towson, Cockeysville, Hunt Valley, White Marsh, Perry Hall, Parkville, Nottingham, Kingsville, Phoenix, Monkton
Elkton, North East, Rising Sun, Port Deposit, Chesapeake City, Charlestown, Earleville
Annapolis, Severna Park, Crofton, Glen Burnie, Pasadena, Arnold, Edgewater, Davidsonville
Columbia, Ellicott City, Clarksville, Fulton, Highland, Glenelg, West Friendship
York, Lancaster, Harrisburg, West Chester, Gettysburg
Bel Air, Forest Hill, Fallston, Aberdeen, Havre de Grace, Joppa, Edgewood, Jarrettsville, Whiteford, Pylesville
Don't see your area listed? We may still be able to help.
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Ready to Build?
Start with a free phone conversation. We'll learn about your project, answer your questions, and help you understand what's possible. No pressure and no pushy sales tactics.
4.9 stars on Google • 94 verified Google reviews • MHIC #91686 • Locally owned and operated
