South Mountain Company

Founded in 1975 on Martha’s Vineyard in West Tisbury, Massachusetts, South Mountain Company is an employee-owned design/build firm specializing in architecture, construction, interiors, and renewable energy technology. As a certified B Corp and worker cooperative since 1987, the company is deeply committed to environmental stewardship through its triple bottom line approach—balancing people, planet, and profit.
South Mountain has played a pivotal role in advancing clean energy adoption across Martha’s Vineyard. They have installed approximately half of all operational solar systems on the island—about 250 out of 500 total—as of recent reports. Their portfolio includes residential net-zero neighborhoods (such as Eliakim's Way), commercial installations like Cronig's Market’s solar carport with EV charging stations, as well as municipal partnerships that enable towns to offset most or all municipal electricity use with renewables.
The company emphasizes collaborative project delivery involving clients at every stage while maintaining high standards for craftsmanship and sustainability. Their leadership team brings decades of combined experience across architecture/engineering/design/build disciplines. South Mountain continues to set benchmarks for sustainable development regionally by integrating advanced building science with social responsibility.