Special zoning regulations apply to ADU construction in San Pedro. Forming ADUs is allowed in residential areas but there are some restrictions. Each zone has different rules that govern the size and location of the ADU. It is necessary to check the zoning map before construction. Our team will provide you with the right information.
The following table shows the maximum size of ADUs allowed in San Pedro:
| Plot Size | Single-family (maximum floor area) | Duplex and multi-family (maximum floor area) |
| 4,000 | 1,000 sq ft | 600 sq ft |
| 6,000 | 1,300 sq ft | 800 sq ft |
| 8,000 | 1,600 sq ft | 1,000 sq ft |
| 12,000 | 2,000 sq ft | 1,400 sq ft |
| 16,000 | 2,500 sq ft | 1,800 sq ft |
The maximum height limit of the ADU in San Pedro is extremely significant. The height of the ADU should be less than the height of the main house. The maximum height of a single-storey ADU can be up to 16 feet. The maximum height for a two-storey ADU has been set at 25 feet. The slope and architectural features of the roof are included in this range.
A maximum of 50 percent of the total area of the plot can be built-up area. This range includes both the main house and the ADU. It is important to maintain open space and greenery. The parking area is not counted in this limit. This rule helps in maintaining the environmental balance.
The ADU can be installed behind or next to the main house. ADUs are not allowed in the front courtyard. The minimum distance between two ADUs should be 10 feet. The privacy of the neighbor should be taken care of in the location selection.
Single-Family Homes:
Duplexes and Multi-family:
The exterior design of the ADU should match the main house. The style of the roof, the design of the windows and the building materials should be the same. The color scheme should resemble the main house. It is necessary to use high-quality materials on the exterior walls. These rules help maintain the beauty of the neighborhood.
ADU requires an additional parking space. The size of the parking lot should be at least 9×18 feet. ADUs located near a public transport station may be exempt from parking. Alternative parking arrangements will have to be made when the garage is converted into an ADU.
A minimum distance of 20 feet from the road side is required. A setback of 5 feet is required in the side yard. A setback of 10 feet will have to be kept at the back. Setbacks are required on both roads side in corner plots. These rules ensure the privacy of neighbours.
The following table shows the minimum plot area in different zones:
| Zone | Minimum plot area |
| R-15 | 4,000 sq. ft. |
| R-8 | 6,000 sq. ft. |
| R-5 | 8,000 sq. ft. |
| R-3 | 12,000 sq. ft. |
| R-1 | 16,000 sq. ft. |
ADUs require independent power connections. The meter should be separate from the main house. Water and sewer lines can be connected to the main house. The gas line connection must conform to safety standards. All connections must be established in accordance with local building codes.
Separate connections can be arranged for internet and cable TV. While planning to install solar panels, special care has to be taken of the electricity connection. With the facility of smart meters, electricity consumption can be monitored. It is necessary to obtain all the necessary permits for a utility connection.
It is necessary to follow strict rules for fire safety. Smoke detectors and carbon monoxide alarms are mandatory. There should be two separate exits for emergency exits. The size of the windows should be sufficient for emergency evacuation. Fire extinguishers should be available in every room. Regular checks of safety equipment are essential.
Special permits are required to rent short-term ADUs. The tenant cannot be retained for less than 30 days. Domestic business is allowed but with some restrictions. There should be no noise or pollution from the business. Additional parking arrangements will have to be made. Violations of these rules can result in fines.
ADU construction in San Pedro requires adherence to California building codes. All building materials should be of standard quality. Electrical and plumbing works will have to be done by licensed contractors. Adherence to earthquake safety standards is a must. There will be regular inspections during construction.
A detailed construction plan must be submitted to obtain the permit. The application has to be made with all the necessary documents. It is necessary to pay the permit fee on time. The timetable for inspection has to be adhered to. Construction work can be started only after getting the permit.
The following table shows the fees for various permits:
| Permit Type | cost |
| Building Permits | $1,800 – $4,500 |
| Electrical Permit | $200 – $450 |
| Plumbing Permit | $180 – $350 |
| Mechanical Permit | $130 – $280 |
| Demolition Permit | $90 – $180 |
| Landscaping Permit | $40 – $90 |
To build an ADU in San Pedro, the property must meet special criteria. The size of the plot is required to be at least 4,000 square feet. The main house must be legally registered. There should not be any outstanding taxes or other liabilities on the plot. Drainage and soil conditions should be suitable.
Additional parking space will have to be arranged for ADU. The parking lot may be covered or open. ADUs located near public transport hubs may get exemptions in parking rules. In case the garage is converted into an ADU, alternative parking will have to be arranged. The minimum size of the parking lot should be 9×18 feet.
The distance of the ADU from the main road side should be at least 20 feet. Setbacks are necessary on both roads on the corner plot. ADUs are not allowed in the front yard. Enough space has to be left for landscaping. Trees and plants can be planted in the setback area.
A setback of at least 5 feet is required in the side yard. A setback of 10 feet will have to be kept in the back part. Additional setbacks may be required for two-story ADUs. Space will have to be left in the setback for the utility connection. It is necessary to take care of the privacy of the neighbor.
At least 30 percent of the open space should be green. There should be enough space for children to play. There should be proper drainage system. It would be better to use local plants in landscaping. Rain water harvesting can be arranged.
Eligible properties for ADU construction in San Pedro have to meet several criteria. The main house should be a permanent residential unit and comply with all building codes. The size and condition of the plot should be suitable for ADU construction. There should be no rule violations in the building.
There should not be any legal dispute over the proposed site for ADU. The existing structure should be in good condition. There should be sufficient capacity for utility connection. Access to transport and emergency services should be easy. All necessary documents should be available.
Multifamily properties
Junior ADUs are built inside the main house itself. Their maximum area is limited to 500 square feet. A small kitchen is allowed but not a full kitchen. The bathroom can be shared with the main house. Separate entrance is required. The electricity connection can be connected to the main house.
Some ADU designs are already approved in San Pedro. Using these designs speeds up the permit process. The pre-approved design already includes all the necessary standards. They have different size and layout options available. The construction cost can be easily estimated.
The accepted design can be slightly altered. These include modern facilities. Energy efficiency standards have already been met. Construction time is short. The team of experts updates these designs regularly.
ADU Builders CA will assist in successfully completing your ADU project. Our expert team provides guidance every step of the way. Contact us today for a free consultation. Planning will be tailored to your budget and requirements. Let’s come together to make the ADU of your dreams come true.
Fire sprinklers are only required if the primary dwelling also has them.
ADUs typically require a minimum setback of 4 feet from property lines.
Separate utility connections are optional but not mandatory for most ADUs.
The checklist includes design review, site plans, structural plans, permits, and financing.
You need site plans, floor plans, construction details, and a permit application.
Inspections typically include foundation, framing, plumbing, electrical, and final review.
Work with licensed professionals to design and construct your ADU to code.
You may need to revise and resubmit plans to the San Pedro planning office.
Submit complete and accurate documents and work with professionals to avoid delays.
ADUs under 750 sq. ft. are exempt from impact fees.
Yes, it includes checking structure, utilities, and obtaining conversion permits.
Yes, ADUs must meet height, size, and setback requirements, and their design should complement the primary dwelling.
Yes, but you need to ensure the ADU fits within allowable lot coverage and setback rules.
ADUs must comply with California Building Codes, including foundation, framing, insulation, plumbing, and electrical requirements.
Yes, ADUs must comply with California Energy Code (Title 24) and include energy-efficient windows, insulation, and appliances.
You must submit a revised plan to the San Pedro Building Department and may incur additional fees or inspections.
Yes, ADUs near high-noise areas (e.g., busy roads) must include soundproofing measures such as double-glazed windows.
Yes, you can appeal to the city’s Planning Commission or seek adjustments to meet requirements.
Lot coverage varies by zoning but generally allows for up to 50% of the lot to be developed, including the primary dwelling and ADU.
