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Green Building News

Affordable-Home Development Uses Net-Zero Prefabs

In California, a community developed by ZETA combines energy efficiency and renewable-energy systems to shrink energy use in 22 modular homes

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Factory-made. ZETA designed and built homes for the Tierra del Sol affordable-housing development, in Stockton, California, to include 1,268-sq.-ft. in a three-bedroom, two-bath configuration.
Image Credit: ZETA
Factory-made. ZETA designed and built homes for the Tierra del Sol affordable-housing development, in Stockton, California, to include 1,268-sq.-ft. in a three-bedroom, two-bath configuration.
Image Credit: ZETA
The Tierra del Sol development includes 22 units. Tierra del Sol modules were assembled in ZETA’s 91,000-sq.-ft. factory in Stockton. This floor plan was used for all 22 units, each of which includes an attached garage.

ZETA has put its core building strategy to work in Stockton, California, where the company used modular-construction techniques to produce 22 energy efficient single-family homes for an affordable-housing project.

When we last mentioned this project, in June, production of the modules at zFab, the company’s 91,000-sq.-ft. factory in Stockton, was just getting underway, although ZETA had by then already delivered a number of moderately priced, modular-construction structures, including a 1,561-sq.-ft. net-zero-energy townhouse in Oakland, California, as well as multifamily, public, and mixed-use buildings.

Aiming for NZE in the Central Valley

The single-family homes in Stockton are the first phase of an affordable-housing development called Tierra del Sol. All 22 houses are built according to the same 1,268-sq.-ft. three-bedroom floor plan, and each has an attached garage.

Their energy efficiency performance derives in part from their R-22 floors, R-26 walls, R-50 roofs, triple-glazed windows, and envelope airtightness of about 1.03 air changes per hour at 50 Pascals pressure difference. Each house also is equipped with a 4.0 kW photovoltaic system, which is expected to bring overall performance to net zero energy, or close to it.

Project developer Visionary Home Builders had already begun fielding buyer inquiries back in June for these homes, which, at $160,000, are available to buyers with annual household income of no more than 80% of the area median. Financing must come through a Federal Housing Administration-approved lender, although approved buyers are eligible for $30,000 of down-payment assistance.

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