The Miami Home That Became
the World's First WELL Residence

The certification is the news hook. The substance is how the house earns it. CM1 is standards-led rather than amenity-led — there is no cold plunge, no red-light room, no equipment inventory. Its health case is made of construction decisions: fewer concealed cavities, moisture-tolerant finishes, plumbing you can reach, mechanical systems that are separated and inspectable. At CM1, maintainability is part of the health strategy, on the theory that most of what makes houses unhealthy — mold, dust, hidden leaks, stale air — starts in the parts nobody can see or service. It began as one speculative prototype, before the residential program expanded across thousands of homes. It is also the clearest built example yet of the healthy home becoming an engineering discipline.

Credit: Caplow Manzano

The house does not start at a front door. It starts under itself. The entire living level rides on ten-foot columns, and what most houses would spend on foundation becomes a second living zone: an outdoor room of roughly 800 square feet, a summer kitchen with an electric grill, a cabana bath, covered parking, and open air on every side. In Miami's climate this is the most usable room on the property for much of the year — the house itself is the shade structure, the breeze moves through uninterrupted, and none of it needs a watt of conditioning.

The lift pays a second dividend. Caplow Manzano set the living floor against its own century-scale sea-level projection — 16 to 18 feet above current sea level for this site, by the Southeast Florida Regional Climate Compact's curves — so if water ever reaches Silver Bluff, it passes through a ground level designed to get wet. Nothing essential lives down there.

The landscape follows the same logic: native, irrigation-free planting — geiger trees, silver buttonwood, coontie — rather than turf that needs a sprinkler system to survive.

Credit: Caplow Manzano

Upstairs, the main space reads at first like brutalism gone domestic: a polished concrete floor slab, an exposed concrete ceiling, and a suspended canopy of oak paneling floating over the kitchen zone. Every material in view is the finished surface and the structure at once. There is no gypsum board anywhere in this house — not behind the oak, not in the ceilings, not in the closets.

The reasoning is Miami-specific. Drywall is fragile and moisture-prone, and once water finds it — in the urban tropics, water finds it — it becomes a mold substrate sealed inside your wall. Caplow Manzano's alternative surfaces are concrete, lime plaster, metal, glass, and wood panels that unscrew. The firm calls the philosophy hypostruction — Greek hypo, less; build more with less. The exterior walls are concrete block filled with insulation, so the insulation lives inside the masonry instead of inside your air. Wiring, plumbing, and refrigerant lines run behind removable paneling rather than through sealed cavities, and the critical systems of the house can be reached, repaired, or upgraded without cutting anything open.

Daylight was a certification line item, not an afterthought: glazing runs along three exposures with corner glass at the terrace, every room in the house gets natural light, and the windows are high-performance, solar-heat-rejecting units — this is still a cooling climate, and free light is only free if it doesn't arrive as heat.

Credit: Caplow Manzano

The kitchen is where hypostruction stops being an abstraction. The full-height oak wall behind the island is PureBond plywood — a formaldehyde-free hardwood panel product — and sections of it are removable. Behind them: the plumbing, the wiring, the things every other house buries in a cavity and finds again only with a reciprocating saw. Nathalie Manzano compares the access panels to a boat's, where every system is compact, reachable, and expected to get wet eventually. Even the cabinet boxes and vanities follow the rule that nothing in the house should be a material that dies when moisture touches it.

In the ceiling above the island sits the other tell: a cassette-type mini-split unit, flush-mounted, and visibly not connected to any duct. There are no AC ducts in this house at all.

Most houses hand every one of those jobs to a single duct system. CM1 splits them apart. Cooling is room-by-room: each bedroom has its own cassette unit and its own thermostat, so a sleeper who wants the 66-to-68°F range can have it without freezing the rest of the house. Fresh air is a separate system entirely — a dedicated energy recovery ventilator supplies pre-conditioned outside air continuously, and every room also has an operable window, which sounds unremarkable until you notice how many sealed new builds don't.

Water gets the same treatment: a reverse-osmosis system at the kitchen, a whole-house filter behind it, low-flow fixtures, and deliberately short, vertical, accessible pipe runs — fewer joints hidden in horizontal chases, fewer places for a slow leak to go unnoticed for a year. Moisture control is handled less by machinery than by material logic: fewer concealed cavities where moisture problems can develop unnoticed, nothing mold-susceptible in the walls or cabinets, and closets designed for airflow. What dehumidifies the house in Miami's shoulder seasons, when the mini-splits aren't calling for cooling, is the one system question the public record leaves open.

The house in specification form — each system separate, and each one inspectable without opening a wall.

The designation on the plaque is specific. WELL for residential is IWBI's adaptation of the WELL Building Standard for single-family and multifamily homes, scored across ten concepts — air, water, nourishment, light, movement, thermal comfort, sound, materials, mind, and community. A home certifies at 40 of a possible 150 points, with documentation reviewed and verified by a third party rather than declared by the builder.

CM1 scored 58 points and became the program's first certified house in the world in April 2024, having enrolled as an early adopter the previous fall — when construction was already about 80 percent complete. The house was designed to these priorities before a rubric existed to score them, which is the strongest version of the story: the standard caught up to the building. The LEED Platinum certification followed in September 2024 under the LEED v4 single-family system.

What certification proves is bounded, and worth stating once: it verifies that the strategies the project pursued were implemented. It does not measure how the house performs year over year, and no certification does. The value of CM1's plaque is that, for the first time, a house's health strategies were checked by someone other than the people selling it.

It proves the method is buildable and certifiable. A ductless, drywall-free concrete house with accessible service cavities cleared a third-party health standard with an 18-point margin and a LEED Platinum rating on top — in a hurricane zone, on an ordinary 6,000-square-foot corner lot. Nobody can call the approach theoretical anymore.

The economics are less settled. CM1 listed in April 2024 at $2.6 million and sold a year later for $1,865,000, after three price cuts and 354 days on market — below the roughly $2 million the firm reportedly spent on construction alone. One sale proves little by itself; price reflects location, layout, timing, and taste as much as engineering. The sale provides no evidence of an obvious resale premium. The founders framed CM1 as a demand-creation play from the start, and the market, for now, is treating certified health as a story rather than a comp.

The performance record is also younger than the press coverage suggests. No post-occupancy air-quality data has been published, no blower-door result, no filtration or dehumidification specification. The hard material palette makes acoustic treatment an open question. And some of what makes CM1 work is climate-specific: insulated block, elevated slabs, and irrigation-free landscaping are answers to the urban tropics, not a universal template. Concrete carries a real embodied-carbon bill, which the firm answers with longevity — a building that lasts a century amortizes its footprint. That is an argument, not yet a measurement.

You cannot retrofit ten-foot columns under an existing house. The decisions transfer anyway:

• Separate ventilation from space conditioning where practical. An ERV can provide controlled outdoor air while room-level equipment handles temperature, although retrofit feasibility depends on available duct routes.
• Give sleep zones their own thermostat. Room-level control can often be added through zoned or ductless equipment.
• Make plumbing reachable. An access panel at every wet wall converts a hidden leak into a visible one.
• Use moisture-tolerant materials where water lives. Lime plaster, tile, sealed concrete, solid wood — not paper-faced gypsum.
• Ask for the numbers. A blower-door result, a filtration spec, and a water report describe a house better than any brochure.

Credit: Caplow Manzano

Credit: Caplow Manzano

The structural and MEP engineers of record are not publicly credited. Project roles above follow Caplow Manzano's published project credits.