California ADU rules · Imperial County
Can I Build an ADU in Calexico?
Yes — you can build an ADU in Calexico. California's statewide ADU law requires every city, including Calexico, to approve a qualifying accessory dwelling unit by right, plus a junior ADU (JADU) on a single-family lot. What varies city to city are the local specifics below.
Can you build one?
ADUs allowed
CA state lawYes — by right
ADUs and JADUs are allowed by right in all residential and mixed-use zones; ministerial approval, no hearing.
Units on a single-family lot
CA state law1 ADU + 1 JADU
At least one ADU and one JADU per single-family lot (a conversion ADU may also be possible).
Units on a multifamily lot
Local ruleconversions (>=1 or 25% of units) + up to 2 detached (proposed multifamily) or up to 8 detached (existing multifamily), not to exceed number of existing units
Local code limits detached ADUs on multifamily lots to 2 (proposed) or 8 (existing), not to exceed number of existing units.
Junior ADU (JADU)
CA state lawAllowed
Up to 500 sq ft, within the walls of an existing single-family home (single-family lots only).
Size & height
Max detached ADU size
CA state law1,200 sq ft
Statewide default cap for detached new-construction ADUs in the absence of a compliant local ADU ordinance. The unconditional by-right floor a city must always allow is 800 sq ft (see Guaranteed minimum size); a city with a compliant ordinance may set its own ceiling.
Max attached ADU size
CA state law50% of the primary dwelling, but ≥850 sq ft (≥1,000 sq ft for 2+ bedrooms) is always allowed
Guaranteed minimum size
CA state law800 sq ft
An 800 sq ft ADU must be allowed regardless of FAR/lot-coverage caps; a city also cannot cap an attached ADU below 850 sq ft (1,000 for 2+ bedrooms).
Max JADU size
CA state law500 sq ft
Max height
CA state law16 ft
16 ft baseline; cities must allow 18 ft within ½ mi of a major transit stop or where the primary dwelling is two-story, and 20 ft on a lot with a multistory multifamily building.
Setbacks
Side setback
CA state law4 ft
A city cannot require more than 4 ft side or rear setback; conversions of existing structures are exempt.
Rear setback
CA state law4 ft
Front setback
Local rule25 feet (unless otherwise allowed by § 17.03.200(G)(1)(c)); conversions exempt if built in same location/dimensions as existing structure
Local 25 ft front setback for new ADUs; conversions exempt if in same footprint.
Separation from main house
CA state lawNone required
No statewide separation requirement between the ADU and the primary dwelling.
Parking
Parking required
Local ruleUp to 1 space
One off-street space per ADU or per bedroom, whichever is less; exemptions per state.
Transit parking exemption
CA state lawYes — no parking required near transit & for conversions
No parking may be required within ½ mi walking distance of transit, in a historic district, for an ADU within an existing structure, within one block of car-share, or in certain permit-parking areas.
Garage-conversion replacement parking
Local ruleNot required
No replacement required for parking lost to ADU conversion or construction.
Approval, timeline & cost
Approval path
CA state lawMinisterial (by right)
No public hearing or discretionary design review for a qualifying ADU.
Approval timeline
CA state law60 days
The agency must act within 60 days of a complete application — and the ADU is deemed approved if it does not.
Owner-occupancy
Local ruleOnly for a JADU
No owner-occupancy for ADUs; required for JADUs.
Impact-fee waiver
CA state lawWaived under 750 sq ft
An ADU of 750 sq ft or less pays no impact fees (the 750 sq ft threshold itself is exempt under § 66311.5); larger ADUs pay fees proportional to the primary dwelling. JADUs (≤ 500 sq ft) are exempt.
Permits required
Local ruleADU permit, Building permit
Both an ADU permit and a building permit are required.
Calexico-specific factors that can change the answer
State law sets the floor, but these local conditions often decide whether a specific parcel works.
Sprinkler requirements
Sprinklers required in ADU/JADU only if required in primary residence; ADU/JADU does not trigger sprinklers in main house.
Historic district parking exemption
No parking required for ADUs in architecturally and historically significant historic districts.
Calexico caps detached ADUs at 800 sq ft and requires a 25 ft front setback for new ADUs. Multifamily lots are limited to 2 or 8 detached ADUs depending on whether the building is proposed or existing.
Frequently asked questions
Can I build an ADU in Calexico?
Yes. California's statewide ADU law requires Calexico to approve a qualifying accessory dwelling unit ministerial (by right), plus a junior ADU (JADU) on a single-family lot.
How big can an ADU be in Calexico?
A detached ADU of at least 1,200 sq ft must be allowed, and an ADU of 800 sq ft can never be zoned out by floor-area or lot-coverage limits. A JADU can be up to 500 sq ft.
What are the setback requirements for an ADU in Calexico?
Side and rear setbacks are limited to 4 ft. 25 feet (unless otherwise allowed by § 17.03.200(G)(1)(c)); conversions exempt if built in same location/dimensions as existing structure.
Is parking required for an ADU in Calexico?
Up to 1 space. No parking can be required within ½ mile of transit, for conversions, or for units inside the primary home. When a garage is converted, replacement parking is not required.
How long does ADU approval take in Calexico?
A complete application must be acted on within 60 days, with ministerial (by right) — no public hearing or discretionary design review for a qualifying ADU.
Do I have to live on the property to build an ADU in Calexico?
Owner-occupancy: only for a jadu. ADUs under 750 sq ft are also exempt from impact fees.
Sources
- Calexico Zoning Code § 17.03.200 (Ord. No. 1108, § 3(Exh. A), 2-2-10)
- Calexico Zoning Code § 17.03.200(E)(c)-(d)
- Calexico Zoning Code § 17.03.200(G)(3)
- Calexico Zoning Code § 17.03.200(G)(7)
- Calexico Zoning Code § 17.03.200(G)(7)(c)
- Calexico Zoning Code § 17.03.200(F)(7)
- Calexico Zoning Code § 17.03.200(D)(1)
- Calexico Zoning Code § 17.03.200(F)(3)
- Calexico Zoning Code § 17.03.200(G)(7)(b)(ii)
- Cal. Gov. Code §§ 66310–66342 (ADU Law)
- HCD 2025 Accessory Dwelling Unit Handbook
- Cal. Gov. Code § 66317 (ministerial approval, 60-day deadline)
- Cal. Gov. Code § 66323 (by-right ADU/JADU, 800 sq ft, 4-ft setbacks)
- Cal. Gov. Code § 66333 (junior ADUs)
- Cal. Gov. Code § 66321 (size minimums & height)
- Cal. Gov. Code § 66322 (ADU parking; § 66334 covers JADU parking)
- Cal. Gov. Code § 66311.5 (impact fees: none for an ADU ≤ 750 sq ft or JADU ≤ 500 sq ft)
Last updated post-2020 state law compliance. This is an AI-assisted summary of Calexico's ADU rules, drawn from its published ordinance and California ADU law — general information, not legal advice, and it may be incomplete or out of date. Verify the controlling rule for your specific parcel with Calexico Planning before relying on it.
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