What you can build
Solana Beach ADU Regulations & Zoning
ADU regulations are complex, but when you’ve done this for 100+ projects, you know the details inside and out. We publish our insights because we want people to get accurate information… not just regurgitated bullet points. Our summary was last updated in February 2025.
KEY RULES AT A GLANCE
Size and Separation
Maximum size 1,000 square feet
Side/rear setbacks 4 feet
Two story No
Building separation 6 feet
Additional Requirements
Soils Report No
Building Verification Survey No
Coastal permit (in some areas) Yes
Stormwater Mitigation No
Number of ADUs Allowed
How many ADUs can you build in Solana Beach?
On Solana Beach single-family residential lots, you may build one ADU (either attached or detached) and one Junior ADU (JADUs have an owner occupancy requirement and must be converted from existing space within the primary residence).
2025 UPDATE: The 2025 HCD handbook clarified that you may have one single-family converted ADU, one JADU (a conversion of existing space up to 500 sf) and one detached ADU. Prior to this clarification, there was confusion if having a converted ADU plus a JADU would prevent a homeowner from building a detached ADU. Only one detached ADU is still allowed.
How many ADUs does Solana Beach allow for multifamily properties?
Solana Beach 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.
Can I build a guest house or pool house in Solana Beach?
Based on city feedback in February 2025, the City no longer permits guest houses or pool houses. They only permit attached or detached accessory structures (ADUs) and garages/storage sheds.
Any storage structure must be unconditioned. Utilities, such as but not limited to heating, AC, plumbing fixtures, etc., cannot be within or pass through the unconditioned building.
ADU Size & Building Constraints
What size ADU can you build in Solana Beach?
Solana Beach allows for a detached or attached ADU up to 850 sqft for units with 1 bedroom, and up to 1000 sqft for 2+ bedrooms. ADUs up to 800 square feet are exempt from lot coverage requirements. (Meaning: You can build an ADU of this size even if you’re maxed out on lot coverages).
What is the height requirement for an ADU in Solana Beach? Can you build a 2-story ADU in Solana Beach?
The height of a detached ADU can be up to 16′.
Also, per recent state law change, detached ADUs within half a mile of major transit stops or high-quality transit corridors can use 4′ side & rear setbacks, up to 18 feet tall. An additional 2 feet can be added if the ADU’s roof pitch matches the primary dwelling. This 18’+2′ limit would allow for a two story unit.
Read more about two story ADUs and height limits.
What are the requirements of the exterior of the ADU?
The exterior roofing, trim, walls, windows and the color palette of the ADU shall incorporate the same features as the primary dwelling unit. Unique to Solana Beach, “the primary entrance to the ADU shall not be visible from the street adjacent to the front yard setback.” Also, ADU parking in setback areas visible from the street shall be screened by vegetation that has a maximum maturity height of 42″.
Setbacks
What is the setback requirement for an ADU in Solana Beach?
ADUs must have 4′ minimum setbacks from rear and side-yard property lines, with front yard setback per zoning standards. An ADU taking advantage of the 4′ setbacks cannot exceed a height of 16 feet. An ADU exceeding 16′ must comply with the setbacks of the underlying zoning.
What is the minimum distance the ADU must be from existing structures?
The minimum required distance between structures is 6′ (eave to eave), with a minimum of 10′ (eave to eave) from the entrance of an ADU if it is facing the wall of another structure on the property.
Additional Requirements
Does Solana Beach require in-person submission of plans for an ADU?
No, Solana Beach allows digital submission of plans and does not require in-person submission of plans.
Does Solana Beach require a soils report for an ADU?
No, Solana Beach does not mandate soils reports for ADUs.
Does Solana Beach require coastal development permits?
Yes, all development in Solana Beach must undergo both Planning Department review and Coastal Development Permit (CDP) approval due to the city’s location within the California Coastal Zone. Here’s how the process works:
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Initial Planning Review:
- Plans are submitted to the Planning Department for an initial review.
- Once the review is approved, the applicant will receive instructions for full plan check submission and payment of associated fees.
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Coastal Development Permit (CDP):
- All projects in the Coastal Zone require a CDP, reviewed and approved by the California Coastal Commission (CCC).
- Properties on the Bluff: It’s recommended to obtain CCC approval before submitting plans to the City for initial review, as the City cannot approve the plans without this approval.
- Properties Not on the Bluff: CCC approval is still required but can be obtained during the process. However, the City cannot issue the final building permit without this approval.
Read more about ADUs in the coastal zone.
Multifamily
How many ADUs does Solana Beach allow for multifamily properties?
Up to two detached accessory dwelling units shall be permitted on a lot with an existing multifamily dwelling, not to exceed 16′ in height
Can you stack detached ADUs on top of each other?
No, you cannot stack ADUs on top of each other in Solana Beach.
Can you attach two ADUs to each other in Solana Beach?
It is currently undetermined if two detached ADUs can be attached to each other; this will be subject to city interpretation.
Can you convert existing space to an ADU?
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.
Parking
What is the parking requirement for an ADU in Solana Beach?
A parking space is not required for an ADU in any of the following instances:
- Within a one-half mile walking distance from public transit, which includes bus stops.
- Within an established historic district.
- Converted from the existing space of a primary residence or accessory structure, or are attached to an existing or proposed primary residence.
Where can a parking space be located?
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.
Additional Solana Beach ADU Regulation Resources
Solana Beach Ordinance 525 – Replacing 17.20.040(D) – Accessory Dwelling Units
Search ADU Plans
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