Pomona, CA Accessory Structures: Garage Conversions (2026)

Sec. iii of the Zoning and Development Code allows an Interior ADU to be created within the existing space of an accessory structure, expressly including a garage, on a lot with a proposed or existing single-unit dwelling. An existing accessory structure of any size may be converted to an Interior ADU, with up to 150 additional square feet allowed only if the expansion is limited to accommodating ingress and egress; any larger expansion is not permitted under this ministerial track. The converted unit needs exterior access independent of the primary dwelling and side and rear setbacks sufficient for fire and safety as dictated by the building and fire codes, but Sec.

4 waives any additional yard setback for a structure built in the same location and to the same dimensions as the existing structure being converted. Where a detached garage is demolished and replaced by a new ADU rather than converted in place, Sec. 4 requires the City to review the demolition permit together with the ADU application and issue both at the same time. On parking, Sec. 5 states that when a garage, carport, or covered parking structure is demolished in conjunction with building an ADU, or is itself converted into an ADU, the resulting loss of off-street parking spaces does not have to be replaced anywhere else on the lot.

Because this falls under the Type 1, Building-Permit-Only track described in Sec. a, the conversion is approved ministerially, without a hearing, so long as it meets these general requirements.