Everything you need to know about ADU Unit San Diego

According to state legislation (ADU), all single-family residences are permitted to include at least one Accessory Dwelling Unit, according to state legislation (ADU). Furthermore, owner-occupied single-family homes may have one ADU unit San Diego and one Junior Accessory Dwelling Unit (JADU) (JADU). In addition, multi-family buildings may now add one ADU for every four existing residential units if they are lawfully created. In addition, multi-family houses may include up to two detached ADUs.


ADU Bonus for Low-Cost

ADU Bonus for Low-Cost ADUs One additional ADU shall be permitted for each ADU on the premises designated as affordable to meager income, low income, and moderate-income households for not less than 15 years, as guaranteed by a written agreement and a deed of trust securing the agreement entered by the applicant and the President and Chief Executive Officer of the ADU unit San Diego Housing Commission.

There is no limit to the number of bonuses ADUs built inside a transit priority region.

(i) One additional ADU is authorized outside of a transit priority region.

(ii) For ADUs to be considered inexpensive and fulfill the standards of Section 141.0302(b)(2)(G), the qualifying criterion listed in Table 141-03A must be satisfied.

Types of ADUs permitted:

Detached ADUs, Attached ADUs, and Junior ADUs are all permitted. ADUs and JADUs may be built from scratch or adapted from existing space.

Lot Dimensions:

Accessory Dwelling Unit (ADU) developments on single-family or multi-family residential lots will not be subject to the underlying municipal zoning codes or special ordinance’s minimum lot size. AB-68

ADU Dimensions:

An ADU must have a minimum gross floor size of 150 square feet. An ADU’s maximum gross floor size must not exceed 1,200 square feet. An ADU built inside an existing dwelling unit, or ancillary building may add 150 square feet for entry and egress alone. ADU unit San Diego has much to know.


The following setback allowances apply:

We are Changing an existing building into an ADU or JADU. An ADU or JADU built in the exact location and proportions as an existing building may experience the same setbacks as the one it replaced. There is no setback requirement for converting an existing dwelling unit or ancillary building to an ADU or JADU or a part of an ADU or JADU.

(ii) Construction of new ADU and JADU constructions. To allow construction of the ADU or JADU, new ADU and JADU buildings may intrude into the necessary interior side yard and rear yard setbacks up to the property line. New ADU and JADU constructions must adhere to the zone’s front yard and street side yard setbacks.



(A) ADUs and JADUs are not needed to have on-street or off-street parking. If the applicant wishes to offer off-street parking spots for ADUs and JADUs on the site, such spaces must meet the following requirements: Off-street parking spaces may be in any form, within setback zones, and may include tandem spaces or motorized lifts.

(i) Off-street parking spots must be situated within hardscape areas and meet the minimum criteria and recommendations for providing safe and efficient vehicle access to the lot.

(B) When a garage, carport, or covered parking structure is destroyed as part of the building of an ADU or JADU, or when it is converted to an ADU or JADU, replacement of those off-street parking spots is not needed.

Fire Protection:

Fire sprinklers are only needed in the ADU if required in the principal residence.

Shape, materials, and design:

The architectural design aspects of the principal home, including but not limited to paint color, windows, roof pitch, and massing, must be replicated in the ADU unit San Diego.


For ADUs atop a garage or other ancillary structure: The maximum construction height for flat-roofed buildings is 21 feet, and for sloped-roofed structures with a roof pitch of at least 3:12 feet (3 vertical feet to 12 flat feet). For detached ADUs that are not atop a garage or other ancillary structure: The maximum height is 15 feet without a chimney or flue and 17 feet with a chimney or flue.

Design evaluation:


It would help if you got a construction permit. Please refer to Section 2A of the Project Submitting Manual for all basic requirements about the submittal procedure.

  1. Common Submittal Documents The following are the minimum submission criteria for any partner or junior unit proposal:

Section 2A of the Project Submittal Manual states:

Preparation / Calculation:

(a.) Site Plan and Surrounding Area Map (See Information Bulletin 122).

Floor plans and roof plans

(b.) Elevations and sections

(c.) (as applicable).

(d.) Building plans and details.

Structural calculations and truss calculations, for example (as applicable).

(f.) Energy calculations under Title 24.

Forms are Second.

(a.) DS-3032, General Application.

(b.) DS-16 Water Meter Data Card

DS-560 Storm Water Applicability Checklist (not required for a Junior Unit).

ADUs are required by state legislation to go through a ministerial review procedure. That mandates that a planned ADU that meets all state and municipal criteria are authorized within no more than 120 days after filing, or else the ADU be approved automatically.

The Ratio of Floor Area

The gross floor area of the companion unit must be included in the computation of the floor area ratio for the premises.


One 24-inch box tree must be placed in the required front yard or adjacent parkway. Existing trees with a height of at least 15 feet and a width of at least 15 feet may be utilized to meet this criterion.



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