In response to soaring land, construction, and material costs along Utah’s Wasatch Front and Back, STUDIO 125 presents a concrete, replicable alternative to continued suburban sprawl. The project demonstrates that it is legally and structurally feasible to add a second, full-scale residence to an existing residential lot. This can be done without consuming new land, without extending infrastructure, and without architectural compromise.



The underlying principle is straightforward: rather than developing untouched landscapes, agricultural zones, or natural open space, STUDIO 125 activates the latent potential of already-serviced parcels. Road access, utilities, and existing structures are already in place. What has been missing is the architectural commitment to densification. This project provides it.

STUDIO 125 moves well beyond the conventional ADU model, typically limited to 700 to 1,200 square feet. On a 0.36-acre, south-facing, wedge-shaped lot, whose narrower southern end already accommodates a 2,500 sq. ft. residence, a second, fully independent 3,300 sq. ft. home is being constructed at the northern end of the property. The new structure can function as a single-family home for a large family, as two independent units of three and four bedrooms respectively, or as a combination with a separate accessory apartment, each with private access and dedicated outdoor space.

A 250 sq. ft. connector element satisfies Summit County’s code requirement for structural continuity between buildings on lots under half an acre, while providing long-term flexibility of use. Both structures are designed to Passive House standards, delivering exceptional energy efficiency, thermal comfort, and a reduced environmental footprint at an elevation of 7,000 feet.

What distinguishes this project from comparable proposals is its mode of realization. STUDIO 125 is being designed and built entirely by the architect, starting from concept development and energy performance simulation through its entire construction. This decision reflects the practical realities of Utah’s residential contracting market, where the availability of tradespeople experienced in high-performance, high-quality construction to specification remains very limited. Rather than accepting compromised outcomes, the architect chose to assume full responsibility for the build. This design-build approach is itself part of the argument: it demonstrates that high-performance, sustainable densification is not only theoretically viable, but practically achievable. The gap between architectural vision and built reality can be closed with sufficient commitment and skill. The project is intended as a legible, reproducible model for how suburban communities can grow more responsibly — not outward, but inward.