Duplex homes are quietly becoming some of the hottest real estate investments across the country, and the data behind that trend tells a compelling story. The global multifamily housing construction market grew to $918.51 billion in 2025 and is projected to cross $1 trillion in 2026, driven by rising investment in affordable housing and a growing renter population that CBRE research estimates at 1.8 million additional U.S. households who can no longer afford the median-priced home in their market. Yet despite that demand, NAHB data shows the “missing middle” construction sector, which includes duplexes and small multi-family properties, totaled just 4,000 starts in the third quarter of 2025, representing only 3% of multifamily production. That gap between demand and supply is exactly the opportunity W.L. Martin Home Designs designed the Haven Ridge (Plan #24669) to address, and it is one of the most requested plan types our developers have been asking us to add to our “Affordable by Design” collection.
The Haven Ridge is a thoughtfully engineered one-story duplex offering two mirror-image units, each delivering 1,176 square feet with 3 bedrooms, 2 full bathrooms, and an attached 1-car garage. What makes this plan genuinely innovative among one-story duplex designs is how the open-concept living core functions as a natural dividing line between two distinct bedroom zones within each unit.
Toward the front of the home, two bedrooms share a full bathroom, while the primary suite sits at the rear of each unit with its own dedicated full bathroom, delivering a level of privacy and spatial separation that is rarely found in a sub-1,200 square foot design. With 9-foot ceilings running throughout, the connected living room, dining area, and island kitchen at the center of each unit feels especially open and airy, giving residents a sense of volume that goes well beyond what the square footage alone suggests.
Beyond the layout itself, it is the details inside the Haven Ridge that set it apart from comparable duplex plans in the same size range. Just outside the kitchen of each unit sits one of W.L. Martin Home Designs’ signature pantry and laundry combination rooms, a space-smart utility zone that consolidates grocery storage and laundry chores in one organized space without adding unnecessary square footage to the overall footprint. That kind of practical, builder-tested detail is what has made W.L. Martin plans a go-to resource for developers who need designs that work as well on the construction side as they do for the tenants who move in. Developers who have built from our previous plans have reported measurable savings on material costs and construction timelines, and the Haven Ridge was engineered with that same cost-conscious discipline from the ground up.
For developers and investors searching for a “one-story duplex plan for sale,” a “3 bedroom duplex house plan,” or a “duplex plan with attached garage,” the Haven Ridge, Plan #24669, is available for direct purchase right now at wlmartinhomes.com. With two fully livable, rentable units on a single lot footprint, an open island kitchen, 9-foot ceilings, a private rear primary suite, and a signature pantry-laundry combination on both sides of the structure, this is the duplex plan that delivers modern living without the modern price tag. Browse the full “Affordable by Design” collection at wlmartinhomes.com and put the Haven Ridge to work on your next multi-family development, rental portfolio, or owner-occupied investment build today.