Custom Outdoor Living Spaces, Decks, Patios & Pergolas in Maryland
Welcome to Custom Design & Build LLC
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Transform Your Home with Custom Sunrooms & Outdoor Living Spaces
At Custom Design & Build LLC, we design and build custom sunrooms, three-season rooms, and outdoor living spaces that extend your home and expand how you live. Whether you’re looking for a bright, year-round sunroom addition, a three-season room to enjoy Maryland’s spring and fall, or a custom deck for summer entertaining, our team brings decades of hands-on experience to every project.
Based in Fallston, MD, we’re proud to serve homeowners throughout Harford County, Baltimore County, and Cecil County. As authorized Sunspace dealers and certified outdoor living specialists, we help you choose the right enclosure system for your climate, your home’s architecture, and how you plan to use the space.
From your first consultation through final walkthrough, we handle every detail—design, permitting, and construction—so your project is completed on time and built to last. Call us at 443-981-1835 to schedule your free design consultation.
Why Choose Us?
Maryland’s Trusted Sunroom & Outdoor Living Contractor
Homeowners across Harford County choose Custom Design & Build LLC for sunrooms, three-season rooms, screen rooms, and custom decks because we deliver craftsmanship that lasts. Our team specializes in enclosed outdoor living spaces designed specifically for Maryland’s climate—from insulated sunroom additions that stay comfortable year-round to three-season rooms that let you enjoy the outdoors from early spring through late fall without the bugs, pollen, or unpredictable weather.
We use premium materials from industry-leading manufacturers including Sunspace, Trex, and Azenco. Every project is backed by our commitment to clear communication, transparent pricing, and construction quality that exceeds expectations. Whether you’re converting an existing deck into a sunroom, adding a three-season room off your kitchen, or building a complete outdoor living space from the ground up, we’ll guide you through
Our Services
Our Services
From custom sunrooms and three-season rooms to decks and pergolas, we design and build outdoor living spaces tailored to Maryland homes.
Sunrooms
Add bright, beautiful living space with energy-efficient Sunspace systems designed for year-round comfort in Maryland.
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Three-Season Rooms
Enjoy your backyard from March through November without bugs, pollen, or rain. An affordable alternative to fully insulated sunrooms.
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Screen Rooms
Fresh air and natural light without insects. Easily convertible to a three-season room when you're ready to upgrade.
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Custom Decks
Trex Pro Platinum dealer. Low-maintenance composite decks designed to last decades.
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Porch Roofs
Add shade and protection to your existing deck. Engineered to support future sunroom conversions.
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Pergolas
Classic wood or modern aluminum designs that add architectural elegance and filtered shade to your outdoor space.
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Louvered Pergolas
Certified Azenco dealer. Motorized adjustable roofs that let you control sun and shade at the touch of a button.
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Deck Awnings
Retractable Aristocrat awnings provide on-demand shade and protect your furniture from UV damage.
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Fencing
Wood, vinyl, and aluminum fencing designed to complement your outdoor space and stand up to Maryland weather.
Learn MoreWhy a Sunroom is Perfect for Maryland Homes
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 County, Baltimore County, and Cecil County are adding enclosed outdoor living spaces.
Mild Springs & Falls Last Longer
Maryland enjoys extended shoulder seasons with comfortable temperatures. A three-season room lets you soak in the spring blooms and fall foliage without battling pollen, bugs, or unpredictable rain.
Escape Maryland's Humid Summers
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.
Strong ROI for Maryland Homes
Sunrooms and three-season rooms add usable square footage that Maryland buyers love. Many homeowners see 50-75% return on investment when selling—plus years of daily enjoyment.
Protection from Allergens & Pests
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 the sneezing or swatting.
Ready to Enjoy Maryland's Best Seasons?
Schedule a free consultation and let's design a sunroom or three-season room that's perfect for your home and how you want to live.
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