Highest and Best Use

Next door, a new house, somewhere between 3,000 and 4,000 square feet, is going up. It has four bedrooms and four and a half bathrooms—two toilets per occupant, assuming an average household. It has a formal dining room and eat-in kitchen, two rooms that indulge one kind of eating being architecturally distinct from another. It has a primary suite: a bedroom with its own bathroom, its own closet, and often its own sitting room, as though the bedroom were not already a room for sitting.

It also has a bonus room. The bonus room is the most honest room in the house. Its name admits that no particular function was imagined for it when it was built. It exists because the financing supported it and because no one had decided yet what it was for. Some bonus rooms become playrooms. Some become home offices. Some become the room where things go that have no other room to go to. Some are finished with a golf simulator, for playing a round at Augusta National without leaving the house.2 

Every room in this house must be conditioned. The formal dining room used at Thanksgiving. The guest bedroom occupied three days a year. The bonus room awaiting a purpose. The golf simulator awaiting a golfer. Each room is held at a temperature suitable for human occupation regardless of whether any human is occupying it—a local climatic requisite of humidity management and mold prevention. In Houston, where outdoor temperatures regularly exceed 100 degrees Fahrenheit and mechanical conditioning is not supplementary but existential, this is no small obligation. And even before the first utility bill, before the first summer, this new house has already produced between 100 and 300 metric tons of embodied carbon.3 

This is the property’s highest and best use. Not because it was desired, but because it has become the only available option.

The principle of highest and best use has roots in the neoclassical economics of the late nineteenth century.4 Its premise—that the value of any property must be determined by the use that would generate maximum financial return—is foundational to how American real estate has been assessed, bought, sold, and financed for more than a hundred years. The four tests an appraiser must apply are clear: Is the use legal? Is it physically possible? Is it financially feasible? Does it produce the highest value? What the doctrine does not ask is whether the use is appropriate, or durable, or whether it serves those living in the neighborhood, or its greater context (not least its environmental impact). Maximum productivity is the only criterion that ultimately counts.

The postwar consumer economy made this legible at the scale of the domestic. In the decade following the Second World War, the American government, in partnership with the housing industry, made a series of decisions that transformed domestic space into a consumption category. Wartime industrial capacity needed redirecting; the house became the primary theater of a new consumer economy, and domestic spending became a form of patriotism.5 The Levittown house of 1947, at 750 square feet, was not a model, but a baseline. Each decade of suburban expansion normalized a larger starting point. Expansion was progress. Adequacy was something to be ashamed of.6 

The financial mechanism that enforced this expansion was built into the federal appraisal system from the beginning. The Federal Housing Administration (FHA), established in 1934, made the comparable sales method—in which a property is valued not on its own terms but against recent nearby sales of similar size—the standard instrument of American property valuation.7 The directional bias of this system is structural and self-reinforcing. Once larger houses dominate a neighborhood’s recent sales, a smaller house falls outside the comparable pool. A lender cannot originate a construction loan for a 1,000-square-foot house in a neighborhood of 2,500-square-foot replacements and sell that loan to Fannie Mae; no adequate comparables exist to support the appraisal.8 A household that wants to build small is not simply disadvantaged by the market, it is turned away by the bank.

The conforming loan limit, indexed since 1980 to average national home prices, completed the loop: rising prices justify higher limits, higher limits enable larger purchases, larger purchases raise prices.9 The home thus became the primary vehicle of household wealth for the American middle class: pension fund, credit line, and inheritance simultaneously. With savings concentrated in home equity, families had a direct financial stake in appreciation. And appreciation, in a market governed by comparables, required competitive scale. The cultural norm and the financial incentive became indistinguishable.

The result, accrued across decades, is a bloated typology that now constitutes 90 percent of all buildings and 60 percent of total constructed floor area in the United States. In Houston, this logic operates without the friction of zoning.10 Highest and best use is applied, lot by lot, until it remakes the block entirely.

The house that was there is gone. The house that replaced it has a bonus room.

clovisbaronian, House with One Room, existing conditions, 2026. Photograph courtesy of clovisbaronian. The previous owner had patched a section of water-damaged ceiling with a poster of Ronchamp—itself a building plagued by roof leaks.

clovisbaronian, House with One Room, construction, 2026. Photograph courtesy of clovisbaronian. A tarp, strapped down and nailed to the fascia, served as temporary waterproofing. This was a technical upgrade compared to what had been there prior.

clovisbaronian, House with One Room, construction, 2026. Photograph courtesy of clovisbaronian. Two new glulam beams carry the span of the opened interior allowing the house to be reorganized as a single, continuous room. The missing floorboards mark where water, rot, and termites had worked their way through the assembly.

clovisbaronian, House with One Room, construction, 2026. Photograph courtesy of clovisbaronian. The house was built without sheathing; the tongue-and-groove cedar was both structure and cladding. Rather than remove it, which would have required replacing both, rotten and damaged sections were patched and the original facade was reinforced and retained as the sheathing layer for a new rain screen assembly.

clovisbaronian, House with One Room, construction, 2026. Photograph courtesy of clovisbaronian. The original Douglas fir framing, denser and better milled than most lumber available today, stands alongside new pine sistered in for repair.

clovisbaronian, House with One Room, construction, 2026. Photograph courtesy of clovisbaronian. Twenty-eight new piers were installed to underpin the sinking concrete grade beam foundations. Even so, the floor joists resting above them still needed to be sistered as the subfloor was rebuilt.

clovisbaronian, House with One Room, existing conditions, 2026. Photograph courtesy of clovisbaronian. The previous owner had patched a section of water-damaged ceiling with a poster of Ronchamp—itself a building plagued by roof leaks.

But the house from the 1960s, identical to the one two doors down, is still there. And it's not in great shape. The flat roof has deflected over decades of service, it’s negative slope ponding with water after rain. The foundations have sunk unevenly into the Beaumont clay. When the finishes are stripped, the framing tells a story of decades of modification, previous repairs layered over ad-hoc fixes, evidence of interventions that solved one problem while creating another. There are termites.

clovisbaronian, House with One Room, roof framing plan, 2026. Drawing courtesy of clovisbaronian.

clovisbaronian, House with One Room, floor framing plan, 2026. Drawing courtesy of clovisbaronian.

clovisbaronian, House with One Room, roof framing plan, 2026. Drawing courtesy of clovisbaronian.

Fixing this house is, in almost every way, harder than demolishing and building it again. The roof joists need to be sistered. The grade beams need to be stabilized. The envelope needs to be repaired opening by opening, surgically rather than all at once. The work is dispersed through the building rather than consolidated in a single act of replacement. It requires more decisions, more patience, more care, and more attention to what is already there than a new building would demand. It is, nevertheless, the only way, for reasons that are financial, environmental, and architectural, though not always in that order.

clovisbaronian, House with One Room, 2026. Photograph by Rory Gardiner. New finishes wrap the ceiling, walls, and floor, absorbing the evidence of repair into a continuous surface. Occasionally the underlying idiosyncrasies register: a beam that lands nowhere or a room too large to name.

clovisbaronian, House with One Room, 2026. Photograph by Rory Gardiner. The house's original windows were retained, one simply moved to a new location. What remains is reduced to its most basic composition—a structure that is neither quite old nor quite new.

clovisbaronian, House with One Room, 2026. Photograph by Rory Gardiner. The existing walls, largely kept and selectively opened, produced a plan that was discovered more than designed. These remnants of the original layout frame space ambiguously, their relationships a consequence of what was removed rather than what was added.

clovisbaronian, House with One Room, 2026. Photograph by Rory Gardiner. New finishes wrap the ceiling, walls, and floor, absorbing the evidence of repair into a continuous surface. Occasionally the underlying idiosyncrasies register: a beam that lands nowhere or a room too large to name.

The financial reason is the most counterintuitive. Rehabilitation loans—the FHA 203(k) and its conventional equivalents—are underwritten against the projected improved value of the existing property, not benchmarked against neighborhood comparables of new construction sales. The existing structure is the datum. Its smallness is a condition of the project, not a deficiency to be corrected by expansion. Unfinanceable as new construction in most appreciating markets, the small house becomes financeable as a renovation.11 You cannot build this house, but you can fix it. And while the cost per square foot may be higher, it is still more affordable in sum.

The environmental reason is simpler. A renovation of this house produces a fraction of the embodied carbon of a new large one, and preserves the carbon already invested in its structure rather than discarding it. A smaller, carefully considered building demands less energy to condition. Every room serves a purpose. There is no bonus.

The architectural reason is harder to quantify but no less real. The house has been there since 1961, the same year Hurricane Carla made landfall near the Texas coast, destroying nearly 2,000 homes and damaging over 50,000. Since then, it has survived twenty-six federally declared natural disasters that have collectively damaged or destroyed over 500,000 units of Houston-area housing. The scars in its framing, the repairs, the modifications, the evidence of sixty-five years of maintenance, are not problems to be solved; they are evidence that the building has been worth tending to. A house that has been kept is a house that works: its scale, its proportion, its relationship to the street and the trees and the neighboring houses, the volume of air it conditions. In the system of highest and best use, none of these qualities can be reproduced by demolition and replacement. They can only be maintained.

clovisbaronian, House with One Room, 2026. Photograph by Rory Gardiner. From the street, the roofline barely clears the top of the exterior fence—a structure half the size of its neighbors.

That saving a small house is easier than building one is not a justification of preservation in the face of new construction. It is an indictment—not of what people want, but of what the financing system is willing to produce. The small American houses that remain—modified, imperfect, and in some cases barely standing—shouldn’t be considered remnants, but arguments. Arguments for a different accounting of highest and best use.