Exterior, ADU Building Type, and Flat RoofLine The 900-square-foot prefabricated backyard ADU in Los Angeles, California, that Cover designed to bring a family closer together features  bright white composite exterior siding and a deck made from thermally treated ash.  Photo 5 of 6 in Extensions by Joy Bailey from 22 ADU Floor Plans That Make the Most of the Backyard

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The 900-square-foot prefabricated backyard ADU in Los Angeles, California, that Cover designed to bring a family closer together features bright white composite exterior siding and a deck made from thermally treated ash.