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Austin-based Sett Studio makes freestanding backyard offices and studio buildings like this one, which is 92 square feet. The offices are delivered fully built, and installation takes about two days.

Prices for 80-square-foot models start at $15,000 and range to more than $63,000 for a 360-square-foot model. The energy-efficient modular buildings are built from eco-friendly materials such as structural insulated panels, wood siding, and water and ice shield roof membrane.