Chula Vista ADU Requirements and Permits (2026 Guide)

Which code applies right now

The City's ADU standards are in CVMC 19.58.022 (accessory dwelling units) and CVMC 19.58.023 (junior units), hosted at chulavista.municipal.codes. The ADU section has been amended many times since 2003; the most recent codified change is Ordinance 3548 (2023).

On February 26, 2025 the Planning Commission held a hearing on amendments "to align with state law," which would strip out local standards that repeat the Government Code and defer to state law from then on. SnapADU reports the local rules were repealed in April 2025, but the published code still shows Ord. 3548, and no ADU ordinance appears among the City's enactments from May 2025 through February 2026. We could not confirm adoption.

In practice the answer is the same either way. The City code is published, and state ADU law (Gov. Code 66310 and following, renumbered in 2024) controls wherever it is less strict. HCD's ADU Handbook, updated in March 2026 with a December 2025 addendum, is the plain-English version of those state rules. Where the two differ below, we say so.

Size, height and setbacks

Sources: CVMC 19.58.022(C)(3), (5) and (6); CVMC 19.58.023; Gov. Code 66321. Since January 1, 2026, state law measures size as interior livable space (SB 543).

Points owners ask about most

• Two stories. An attached ADU can be two stories. A freestanding detached ADU taller than 18 ft is not allowed by right, which in practice keeps most backyard units to one story. The code does contemplate an ADU built above an accessory structure, which then needs the 4 ft setbacks.
• The 800 sq ft guarantee. Even on a small or heavily built lot, the City cannot use coverage or open-space rules to block an 800 sq ft unit that meets height and setbacks.
• Old nonconformities. The City cannot make you fix an existing nonconforming house or garage as a condition of approving the ADU.
• Sprinklers. Needed in the ADU only where the main home has to have them (CVMC 19.58.022(C)(13)).

How many units fit on one lot

Single-family lots

The City code still reads as one ADU per single-family lot. State law overrides that: Gov. Code 66323(a) guarantees a JADU, a conversion ADU carved from existing space, and one newly built detached ADU, so a large enough lot can hold the house plus three units. ADUs do not count toward the zone's density.

In September 2024 the City Council voted 4-1 against allowing two detached ADUs on single-family lots, after a debate that centered on density west of I-805. That vote has a short shelf life. AB 956 (Chapter 791, Statutes of 2026), signed September 29, 2026 and effective January 1, 2027, obliges cities to permit a second newly built detached ADU wherever a single-family home exists or is proposed. A city may cap those two at 800 sq ft each, with 4 ft side and rear setbacks, and need not approve a JADU as well once both are built. Until January, plan on one.

Duplex and multifamily lots

• Conversions of non-livable space (storage, garages, attics): at least one, and up to 25% of the existing units.
• Detached ADUs with existing units: up to eight under SB 1211, but never more than the number of existing units.
• Detached ADUs with a proposed multifamily building: up to two.

Parking and transit

The most the City can require is one space per unit or per bedroom, whichever is fewer, and that space can be tandem on the driveway or in a setback. No space at all is required if any of these is true:

• Public transit, bus stops included, is a half-mile walk or less away
• The unit sits inside the main house or an existing accessory building
• It is in a historic district
• a car-share car is parked within a block
• On-street permits are required but not offered to the occupant
• It is applied for together with a new home

What makes this so broad in Chula Vista is the definition. CVMC counts any place the public can board fixed-route, set-fare transit, including a bus stop. Our reading is that most of western and central Chula Vista falls inside a half-mile walk of one, but check your own address.

The taller 18 ft height uses a stricter test, a major transit stop or high-quality corridor. The Blue Line trolley stops in Chula Vista at Bayfront/E Street, H Street and Palomar Street, and the Rapid 225 runs east through East Palomar, Heritage, Lomas Verdes, Santa Venetia, Otay Ranch and Millenia stations. Whether a given Rapid stop qualifies for the height bonus is a question for Planning.

Replacement parking: none. When a garage or carport is converted or demolished for an ADU, the City cannot require the lost spaces back (Gov. Code 66314(d)(11), mirrored in CVMC 19.58.022(C)(8)(c)). That is a big part of why a garage conversion is so common here.

Who lives there, rentals and sale

• ADU owner occupancy. The CVMC still contains an owner-occupancy clause that was held in abeyance until January 1, 2025. State law (Gov. Code 66315) bars cities from imposing one on ADUs, so we read it as unenforceable; we have not seen the City confirm that in writing.
• JADU owner occupancy. CVMC 19.58.023 still requires the owner to live in the house or the JADU and to record a deed restriction. Since January 1, 2026, AB 1154 limits that requirement to JADUs that share a bathroom with the main home. Confirm with Development Services which version the City will put in your deed restriction.
• Minimum rental term. 30 days. The City code bars shorter rentals for ADUs applied for after its effective date, and state law requires terms longer than 30 days for ADUs and JADUs.
• Short-term rental permits. Under the City's STR ordinance, any ADU or JADU whose building permit was applied for on or after January 1, 2020 cannot get an STR permit (CVMC 5.68.050). STR permit holders must also have their primary residence in Chula Vista.
• Separate sale. Not allowed. The code treats an ADU as part of the lot, not a separate unit for subdivision or condo purposes. AB 1033 lets cities opt in to ADU condo sales, and we found no Chula Vista opt-in. State law separately allows sale to qualified nonprofits.

City Standard ADU Plans

Chula Vista commissioned a set of pre-reviewed designs from SnapADU, called City Standard ADU Plans, which grew out of the SANDAG Housing Acceleration Program. The City lists 12 designs built on five floor areas (498, 748, 749, 999 and 1,199 sq ft), ranging one to three bedrooms, each offered in a mirrored version. You download them from the City's ADU page and sign a Hold Harmless Agreement and an Affidavit.

The plans cover the building, not your lot. The City's checklist still asks for Title 24 energy calculations from a consultant, stamped truss calculations (which cannot be deferred), and soils, stormwater (SWQMP) and construction waste forms. The payoff is a lower permit fee, $3,951 instead of $4,963, and the three smallest plans stay under 750 sq ft, so they pay no impact fees. The City also launched an online feasibility tool, Build for Chula Vista (Symbium), in July 2023.

Fees at a glance

The City's permit fee is flat: $3,951 for a detached unit on a City Standard plan, $4,963 for a custom detached unit, and $2,380 for a one-story attached unit's first 300 sq ft. ADUs under 750 sq ft and JADUs pay no impact fees; starting at 750 sq ft the bill is a size-based fraction of the house rate. Above 500 sq ft, school fees run $5.38 per sq ft across Chula Vista Elementary and Sweetwater Union. Sewer capacity is $4,793 per EDU, with the ADU factor unconfirmed. A new water meter adds the County Water Authority's $6,683 charge plus the Otay or Sweetwater fee. Worked examples and the calculator are on the ADU cost page.

Fire hazard zones and the Bayfront

Chula Vista adopted new local fire hazard severity zones with Ordinance 3598 (August 5, 2025), replacing CVMC Chapter 15.34, and replaced its wildland-urban interface code (Chapter 15.38) with Ord. 3614 in November 2025. The Fire Department page links to CVMapper for an address lookup and to CAL FIRE's 2025 map viewer. By inewsource's count, Chula Vista's Very High acreage on the 2025 map is at least a tenth larger than on the 2011 version.

We have not verified which parcels or neighborhoods fall in High or Very High zones, so look up your address before design. The City Standard plans include WUI and Very High zone checkboxes on sheet G102, which tells you the ignition-resistant construction rules can apply to an ADU.

The coastal zone matters to very few homeowners here: in Chula Vista it covers the Bayfront and western waterfront, where a Coastal Development Permit may be required.

Submitting the application

1. City or County?

   Make sure the lot is within Chula Vista's limits, then look up its fire zone, transit distance, any HOA and the water agency. Each one can change the drawings.

2. Pick the design route

   Use a City Standard ADU Plan or have custom drawings prepared. Either way you need a site plan, Title 24 report, structural and truss calcs, and the soils, SWQMP and waste forms.

3. Clear HOA review if you have one

   East-side master associations usually review exterior changes. The steps are in the Eastlake and Otay Ranch guide.

4. Email the submittal to DSD

   Send PDFs to dsd@chulavistaca.gov with the subject "New submittal." Staff run a completeness check, you pay plan check fees online in Accela Citizen Access, and a record number is issued. If hard copies are requested, they go to the Building B drop-off bin at 276 Fourth Avenue.

5. Plan review and corrections

   Corrections come back by email. State law gives the City 15 business days to call an application complete and 60 days to act on a complete one (CVMC 19.58.022(C)(14); Gov. Code 66317).

6. Pay fees and get the permit

   School fees are paid to each district, then the City issues the permit by email and inspections begin.

How long it takes

The City does not publish plan check turnaround times. The 60-day clock starts only once the application is complete, so design, consultant reports and your own correction rounds sit outside it. Competitors' estimates of Chula Vista permit time range from 5–8 weeks to 3–5 months. A realistic schedule from first visit to move-in is on the design-build process page.

Already have an unpermitted unit?

Gov. Code 66311.7 protects ADUs built without permits before 2020: a permit for one cannot be turned down solely for failing today's building code, unless a correction is needed for health and safety. That can include an older garage conversion done without permits. Money may help: the ADU Loan Program has a $50,000 option for code repairs on an ADU or JADU that already exists, and the 2023 progress report mentioned an "ADU Amnesty" effort studying whether the same funds could fix unpermitted units. Check with Housing and Homeless Services on the status of both.

How much ADU building is happening

The City's 2023 Annual Progress Report counted 148 ADU building permits issued and 80 ADUs completed that year. Using 2024 state data, UC San Diego's Center for Housing Policy and Design ranked Chula Vista third in San Diego County for ADUs permitted, after the City of San Diego and the unincorporated County, and fourth for ADUs completed. Voice of San Diego and KPBS reported that about 9% of the city's new homes from 2018 to 2024 were ADUs. We could not find an official count for 2025.

Bonita and other County pockets

Unincorporated Bonita, and other County islands with a Chula Vista mailing address, follow San Diego County rules: Zoning Ordinance Section 6156, permits from County Planning & Development Services, and the County's own set of ADU plans. Part of Bonita-Sunnyside was annexed into the City and is zoned under CVMC Chapter 19.72, so a mailing address does not settle it. Your property tax bill or a County Property Summary Report shows the tax rate area; if it says unincorporated, the County issues your permit. Septic lots there need a County environmental health layout approval first. The Bonita page covers the County path.

State law behind the City code

• Gov. Code 66314: ADU standards, including parking and the no-replacement rule
• Gov. Code 66315: no owner occupancy for ADUs
• Gov. Code 66317: 15-day completeness and 60-day decision
• Gov. Code 66321 and 66322: size, height and parking floors
• Gov. Code 66323: unit combinations, amended by AB 956 from 2027
• Gov. Code 66311.5 and 66311.7: impact fee limits and pre-2020 legalization
• Gov. Code 66333: JADUs, including AB 1154's 2026 owner-occupancy change
• Civil Code 4751: HOAs in planned developments cannot ban ADUs