A 400 square foot park model from Phoenix Building Solutions spreads out to 11.8 feet wide, keeping a ground floor bedroom and apartment grade fixtures that most tiny houses trade away for a loft.
The Miami park model from Phoenix Building Solutions measures 11.8 feet (3.6 m) wide and 34.3 feet (10.45 m) long, and that extra width is what lets the New Atlas product showcase treat the unit as "apartment-like" rather than as a typical tiny house. The 400-square-foot (37.16 sq m) interior sits on a single level, with the bedroom on the ground floor instead of tucked into a sleeping loft that requires a ladder.
The trade-off in most small homes is structural: to preserve livable square footage in a narrow footprint, designers push the bedroom up. The Miami tries to invert that by going wider than a typical park model, then keeping everything on one floor. The exterior is clad in board-and-batten engineered wood with a metal roof, and the long side is broken up by generous glazing, including a set of large double glass doors that pull natural light deep into the plan. Phoenix Building Solutions' own spec, as summarized by New Atlas writer Adam Williams on June 9, 2026, lists the standard features that justify the apartment-style positioning: a kitchen with a dual-basin stainless steel sink, oven, cooktop, dishwasher, fridge/freezer, and a dining island; a bathroom with twin sinks and a walk-in shower with a seat; a washer and dryer; and built-in wardrobes in the bedroom.
The single-floor layout, and especially a ground-floor bedroom with standing headroom, is the pitch for downsizers and readers thinking about aging in place. Climb-to-sleep lofts are a real barrier for older buyers, families with young children, and anyone with mobility constraints, and the Miami is designed to remove that obstacle without shrinking the kitchen or collapsing the bathroom into a wet closet. The 11.8-foot width is the mechanism: it gives the kitchen island, the walk-in shower, and the bedroom wardrobe enough breathing room to behave like the rooms in a small apartment rather than the built-ins in a camper.
That framing has to be attributed. "Apartment-like" is Phoenix Building Solutions' marketing language, carried through a trade-press product roundup rather than tested by independent review. The 13 photos in the New Atlas gallery are credited to the manufacturer, and the substantive product claims, including dimensions, fixture lists, and layout, trace back to Phoenix Building Solutions' own materials. The story can repeat those claims, but it should label them as manufacturer specs passed through a design outlet, not as the findings of an independent tester.
The other thing the "apartment-like" label obscures is the regulatory category. The Miami is a park model, a class of small dwelling that in the United States is often built and certified to RV standards rather than to the local residential building code that governs a permanent house on a foundation. That classification has real consequences: it can limit where the unit can legally be sited, what kind of land lease or RV-park arrangement applies, how financing and insurance work, and whether a buyer can treat it as a primary residence in a given jurisdiction. None of those specifics are addressed in the New Atlas showcase, and the excerpt does not state the Miami's transport, certification, or code-compliance details, so the unit is best discussed as one manufacturer's take on wide-body, single-floor park-model design rather than as a turnkey answer to housing affordability or supply.
The category itself is also worth framing carefully. Park models, and "tiny houses" more broadly, are not a single product type, and a 400-square-foot home on a chassis that sits 11.8 feet wide stretches the everyday meaning of "tiny." That is not a knock on Phoenix Building Solutions' design choices, but it is a reason to treat any claim that this unit "solves" downsizing, aging in place, or the housing crunch with caution. One wide-body park model from one manufacturer is a case study in a specific design philosophy: spend the width budget to keep the floor plan horizontal, fit apartment-grade fixtures, and skip the loft. What it costs, where it can be parked, and how it compares with other wide-body or ground-floor park models on the market are questions the source does not answer, and they are the right questions for a reader who is actually considering the category.