ACORN

Architectural Firm: Empyrean
Size: 3,398 square feet
Bedrooms: Three
Baths: Two
Cost: $175 to $225 per square foot, including construction and finishes.

This house customized a model floor plan, adding a barrel vault ceiling. It was manufactured in an Acton, Mass., factory and was delivered on several flatbed trucks. Designer Empyrean has a network of about 300 builders nationwide who are trained to assemble its homes.