Small Efficiency Dwelling Units (SEDUs), which are typically between 200 and 350 square feet and include full bathroom and kitchen facilities inside the units.

California Building Code section R304 requires that efficiency dwelling units provide 220 square feet of living space plus a bathroom and a closet, so the smallest SEDUs possible in Los Angeles are likely about 250 to 275 square feet in size. Shared amenities such as gyms, movie rooms, pools, and laundry rooms may be desirable for either micro-unit typology.

A key concept behind these developments is that the neighborhood itself is the most important amenity for micro-unit residents.