A guest room, yoga studio, home office: That spare room you’ve been dreaming of can be yours by installing a new prefab unit in your backyard. Unlike the protracted, expensive process of building a home extension, these five houses, which measure about 120 square feet, require no permits and can be built quickly for a fraction of the price of larger, architect-designed structures.

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Private Office

Get all that messy desk clutter out of sight in a separate space by Modern Shed. Horizontal wood-beam walls paired with a double glass door and a transom window that lets in lots of light keeps you energized, and the design matches both traditional and modern home aesthetics. 

Modern Shed (from $10,800)

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Breezy Bedroom

The Modern Studio by Kanga has lots of options for customization, like installing a French door to let guests enjoy the breeze while they’re lounging. Adding a small deck makes the compact space feel bigger and connects it to the outdoors. 

Kanga Room Systems (from $8,000)

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Arty Studio

Insulated walls of lightweight aluminum make the Kithaus impervious to rust, termites and mold. Plus, the groovy wood slats on the awnings and sliding shutters look sculptural and handmade--a creative home feel for the art you’ll make there. 

Kithaus (from $32,000)

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Room to Move

The combination of raw metal, wood and finished metal siding makes the Modern Spaces cube look contemporary but not trendy. We’re thinking we’d order it with long vertical windows to make a yoga room with a view--even from downward dog.

Modern Spaces (from $8,000)

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Rec Room

Can’t bear that audio system/giant television/video game competition within your home any longer? We like the idea of a backyard media room from Studio Shed that has recycled denim insulation and fiber cement siding to absorb all that sound. Plus, it’s especially cute when the deck's painted a coordinating color. 

Studio Shed (from $14,400)

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