Escondido ADU Regulations & Zoning

Escondido allows up to 2 detached ADUs for multifamily lots with an existing multi-family building. (Meaning: In order to build 2 ADUs, the property must already have at least a duplex on it, not just a single family dwelling)

Non‐livable space within existing multi‐family structures may be converted into an ADU. Examples of areas that can be converted include storage rooms and garage spaces. The maximum number of ADU allowed in a multi‐family structure is equal to 25% of the number of existing multi‐family units in the structure. Fractional units are rounded down. A minimum of one conversion ADU is allowed.

Yes, a two story unit is possible if it conforms to the height limit for the zone.

Additionally, an ADU may be built to the following:

• a height of 16-feet regardless of applicable height limits;
• a height of 18-feet if within ½ mile of transit;
• if attached to the primary dwelling unit, an ADU may go up to a height of 25-feet.

Read more about two story ADUs and height limits.

The square footage of any attached ADU may not to exceed 50% of the primary dwelling square footage, or 1,200 sqft, whichever is less, but not less than 800 square feet.

The accessory dwelling unit’s color and materials must match those of the primary residence, with respect to roof design, height, compatible materials, color, texture, and design details. If the accessory dwelling unit is an addition to a site with known historic resources or has been determined to have historic value by the director, all improvements shall retain the historical and/or architectural value and significance of the landmark, historical building, or historical district as specified by section 33-1475. The improvements shall be compatible with and retain the texture and material of the primary building(s) and/or structure(s) or its appurtenant fixtures, including signs, fences, parking, site plan, landscaping and the relationship of such features to similar features of other buildings within an historical district.

The minimum required distance between structures is 10′, unless both structues single story, then MAY be reduced to 5′

No, Escondido does not mandate soils reports for ADUs.

No areas are subject to Coastal requirements.

Yes, you can build an ADU on a lot that includes a historic building or a property under the Mills Act. However, the ADU must conform to the specific requirements of the historic structure or Mills Act guidelines. If the property is listed in the National Register of Historic Places, California Register of Historic Places, or the local historic inventory, the ADU should also comply with any approved historic preservation plans. If mandatory design standards for historically classified structures are established by the city council, the ADU must conform to these standards.

At SnapADU, we understand the complexities involved in building an ADU on a lot with historic significance or under the Mills Act. In our Feasibility stage, our expert team would conduct a thorough assessment of the specific requirements and standards that need to be adhered to for your unique property. This careful evaluation allows us to refine the design, scope, and budget to best suit your needs and ensure all guidelines can likely be met before you decide to proceed with full plans.

Code does not specify, and this has yet to be tested with the city.

It is currently undetermined if two detached ADUs can be attached to each other; this will be subject to city interpretation.

Yes, existing non-livable space may be converted to ADUs (e.g. storage areas and garages). The minimum number of ADU conversions allowed is one, up to a maximum equal to 25% of the number of existing multifamily units. This is in addition to the allowed number of detached ADUs.

If a parking space is required, it may be located within the setbacks and in an existing driveway as tandem parking. Parking spaces don’t need to be replaced when a garage, carport, or covered parking structure is demolished in conjunction with the construction of an ADU or converted to an ADU.