An accessory dwelling unit (ADU) is a term for a secondary house or apartment that shares the building lot of a larger, primary house. These take many forms - small cottages, carriage houses, small homes - and come in all kinds of styles.
Sq. Ft.
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Depth
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Block / CMU (main floor)
Most concrete block (CMU) homes have 2 x 4 or 2 x 6 exterior walls on the 2nd story.