A Landscape Design Company Focused on How You Live
Family Legacy Built Into Every Long Island Landscape
What began in 1976 as one man’s commitment to quality and honesty has grown into a family legacy shaping how Long Island lives outdoors. Every project carries our name, and with it, our promise to listen, plan with intention, and design spaces that feel as livable as they are lasting.
Rooted Here. Designed Here. Built Here.
Long Island isn’t where we are, it’s who we are. From the hills of Huntington to the shores of Sag Harbor, we understand its rhythm, its challenges, and its beauty. That’s why our designs fit so naturally here, crafted for how we Long Islanders live, with balance, comfort, and quiet sophistication.
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The family who designs your project stays with it through completion, and gives back through Make-A-Wish builds and local memorials.
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We don’t just install; we imagine, refine, and craft creative environments that belong to their setting.
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Every plan considers proportion, line, and light to create harmony with the home.
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As a full-service design-build firm, we handle every trade, schedule, and detail—so you don’t have to.
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Five decades of experience across Long Island’s unique terrain and communities.
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We’ve built our reputation on precision, artistry, and respect for every stone, plant, and space we touch.
Where Our Craft Becomes Your Story
“Gary and Adam had great vision and experience which helped when planning one of our biggest projects. I really like how much time they will spend with you planning out everything and offering options. I also appreciated their patience because, let's be honest, we homeowners change our minds a lot! They are trustworthy, reasonable and their crew does excellent and meticulous work.”
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— Alan H., via Google
Our Word, Our Work, Our Way
When you choose Gary Duff Designs, you’re trusting a family that understands this land and stands behind every project we build. We design with honesty, build with intention, and treat every property as if it were our own.
Landscape Design Company Guidance from Gary Duff Designs
Choosing who builds your outdoor space is a bigger decision than choosing what gets built. Here's what homeowners weigh.
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A family-owned design-build firm keeps design and construction under one roof, which removes the gap where a designer hands off a plan and a separate contractor interprets it their own way. At Gary Duff Designs, our family stays involved from the first consultation through the final walkthrough, so decisions get made by people accountable for the result. You are not routed through account managers or left to referee between trades that answer to different companies. One team, one plan, and one name attached to how it turns out.
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Fifty years of building on this island is the shortest answer, and it shows up in judgment rather than marketing. Gary Duff Designs has watched its own installations age through five decades of coastal weather, which is how we know which materials, assemblies, and planting choices actually hold. Designs are drawn to honor your home's architecture and how your family lives, not to fill a portfolio. The family name on the company is the same one standing behind every project we finish.
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Smaller projects have a place in our work alongside full-property transformations. Gary Duff Designs takes on select projects starting around $10K when the design goals and the fit are right, including compact terraces, garden renovations, and single fire features. What matters more than budget is whether a homeowner values quality and wants a real collaboration on the design. Scope changes the size of the drawing set, not the standard of the work.
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One member of the Duff family stays personally involved through every phase of your project, whether that is Gary, Adam, or Eric. That means the person reviewing your design is the person walking the site during construction, so you always have a direct line to someone with authority to resolve a question. Direct involvement also catches problems early, since someone who knows the original design intent notices when something drifts from it. Continuity is the reason clients who built with us decades ago still call the same number.
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Long-term quality comes down to what sits beneath the surface, which is where Gary Duff Designs concentrates first. Base preparation, drainage, footings, and connection details determine whether hardscape stays level and structures stay square after twenty Long Island winters. Materials and trades are selected because we have watched them perform here, not because they price well on a proposal. Salt air, humidity, and freeze-thaw cycles punish shortcuts, and the details that resist them are the ones clients never see.
Celebrating 50 Years of design excellence
50 Years of Designing Outdoor Spaces
10,000+ Projects That Transform How People Live.
Enhancing The Quality Of Life Through Landscape Design
For five decades, the Duff family has been redefining outdoor living across Long Island, one purposeful, beautifully built space at a time.