Number of ADUs Allowed in Torrance
- Maximum size: 1,200 sq ft (detached or attached, or 50% of the size of the main dwelling)
- Side/rear setbacks: 4 feet
- Two story: Yes, for both attached and detached ADUs
- Building separation: 6 feet
- Soils Report: Possibly, especially in areas with grading or on hillsides
- Building Verification Survey: Yes
- Coastal permit (in some areas): N/A
- Stormwater Mitigation: Yes
Number of ADUs Allowed in Torrance
You can build one ADU on single-family property in Torrance, as well as convert one existing space within the primary dwelling unit to a JADU.
You can build up to two ADUs on multifamily property in Torrance, as well as convert as many existing non-habitable spaces within the structure as feasible into additional ADUs.
ADU Torrance – Size & Building Constraints
In Torrance, a detached ADU can be a maximum of 1,200 square feet.
In Torrance, an attached ADU can be a maximum of 1,200 square feet or 50% of the primary dwelling unit size, whichever is smaller..
In Torrance, an ADU is usually limited in height to 16 feet. However, if the ADU is positioned over an existing structure, like a garage, specific zoning rules may allow for a taller ADU.
Yes, you are allowed to build a 2-story ADU in Torrance, but the standard 16-foot height restriction is usually insufficient for a viable 2-story building. If zoning variances allow for a greater height limit, a 2-story ADU may be much more feasible.
Since only one ADU is allowed per single-family property in Torrance, it is not possible to get approval for two ADUs stacked on top of each other, one on each story. For multifamily property, which allows up to two detached ADUs, these ADUscanbe stacked on top of each other, with one on each story, but height restrictions still apply. If you don’t qualify for an exception to the standard 16-foot height limit, it will be hard to design and permit a viable two-story structure.
Since only one ADU is allowed per single-family property in Torrance, it is not possible to get approval for two ADUs attached to each other. However, since you can build up to two detached ADUs on multifamily property, you can get approval for two ADUs detached from the main structure but attached to each other into one big structure as long as all other zoning and building rules are observed.
No, a JADU by definition is built into existing space within the primary dwelling unit. It would be a contradiction in terms to have a JADU attached to an ADU.
Yes, you are allowed to build an ADU with a roof deck in Torrance. However, keep in mind that the required safety railing will count towards the total height limit of the ADU. The minimum safety railing height on a roof deck in California is 42 inches.
Torrance requires that new ADUs generally conform to the external appearance of the main dwelling unit — color, material, roof pitch, roofline, door and window style, and other general characteristics to help the ADU blend in with the primary dwelling unit and the rest of the neighborhood.
ADU Setbacks in Torrance
Torrance requires 4-foot rear and side setbacks for new ADUs. ADUs built into existing structures are exempt from setback requirements.
ADUs in Torrance must maintain a minimum of 6 feet of separation from other structures.
No, ADUs cannot be permitted for the front yard in Torrance.
ADU Setbacks in Torrance
Torrance currently does require in-person submission of ADU plans. There is currently no online portal to submit plans digitally.
A soils report may be required for a new ADU in Torrance if the property is located in a seismic hazard zone or if the plans call for significant earthwork.
Depending on the specific zone, the City of Torrance may require between 20-30% of the lot to be maintained as open space — yards, landscaping, permeable surfaces.
Plans must be submitted to the Torrance Building and Safety Division. They must then be reviewed by a variety of departments to check for compliance with the California Building Code, zoning, fire safety, and Title 24 energy standards. The plans may be returned several times for questions, corrections, and revisions. The process takes approximately 4-6 weeks.
Parking for Torrance ADU
Torrance requires one parking space per ADU, in addition to the parking required for the existing dwelling. The space does not need to be enclosed and may be provided as tandem parking on an existing driveway.
No additional parking is required if any of the following apply:
- The ADU or JADU is within a half-mile walking distance of public transit
- The ADU or JADU is in an architecturally or historically significant historic district
- The ADU is part of the proposed or existing primary residence or an accessory structure
Replacement parking is not required when a garage, carport, covered parking structure, or uncovered parking is demolished in conjunction with building an ADU, or is converted into one.
If a new parking space is required, it can be located in the rear or side yard, or in the driveway. Tandem parking is allowed, and the parking space does not need to be covered.
Additional Requirements in Torrance
Per California state law, solar panels of appropriate size and capacity are mandatory on new-construction ADUs. ADUs built from converted existing structures are exempt. Smaller ADUs may be subject to reduced or modified solar panel requirements.
An ADU is not required to have a separate water or electrical meter. You can opt for the ADU to share service with the main dwelling unit. However, you can request separate water or electrical meters from the City of Torrance.
Torrance does not automatically assign a new ADU its own address. However, it may assign the ADU a new address if it is intended for rental or independent occupancy.
Low Impact Development (LID) is an approach to land development or redevelopment that seeks to preserve and conserve onsite water quality and natural features, with minimal detrimental effect to local waterways and ecosystems. Torrance may require LID fees for larger ADUs.
No. Torrance Municipal Code states that an ADU shall not be operated as a short-term rental or rented for a period less than 30 days. The same restriction applies to JADUs.
No, Torrance currently does not impose rent control on any property within the city limits.
While encouraging the use of electric appliances for efficiency and sustainability, West Torrance does not prohibit gas appliances in new ADUs.
In Torrance you are only required to install sprinklers in a new ADU if the primary dwelling unit has them as well. You may also be required to install them if the ADU is located within a special fire hazard zone.
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