Converting a garage into an ADU in Sacramento

Yes, most garages in the City of Sacramento and unincorporated Sacramento County can become an ADU, and an attached garage can become a JADU. State law removes the usual zoning objections for a conversion. What decides the project is the building code: a garage is unconditioned storage, and the inspector will hold it to the standard of a house.

This page covers what is specific to garages. For size limits, the 60-day approval clock and how the jurisdictions compare, see Sacramento ADU rules and permits. For who issues permits by address, see Sacramento remodel permits.

Which department reviews a garage conversion

City of Sacramento. The Building Division. A building permit is required for every ADU, and no separate planning approval is needed before you apply. The city offers an optional zoning review (form CDD-0009) at no fee if you want zoning confirmed before paying for full drawings. Once you submit, the Building Division routes the plans to the other city departments and outside agencies, including water and sewer. The city’s published estimate for building plan review is roughly 1.5 to 2 months, excluding the time you take to answer corrections. Every ADU also needs a new address, which the city says can take up to four weeks.

Unincorporated Sacramento County (much of Carmichael, Fair Oaks, Orangevale, North Highlands, Arden-Arcade). The Building Permits & Inspection Division. The County states that it reviews ADUs ministerially through building permits only, with no discretionary process. Its garage conversion submittal list asks for a dimensioned plot plan, floor and roof plans, elevations and sections, structural plans where applicable, truss calculations, and Title 24 energy forms and calculations. Plans for an ADU go directly to the fire district as a separate submittal.

Two County details catch people:

• ADUs and JADUs are not permitted in the Agricultural-Residential (AR) or Agricultural (AG) zones. Many larger lots in Fair Oaks, Carmichael and Orangevale are zoned AR. Check your zoning before anything else.
• The County’s ADU standards now sit in Appendix A of its Zoning Code User Guide, which states that the County ADU ordinance is repealed effective October 22, 2026, at HCD’s request, and that state law governs wherever the two conflict.

What state law guarantees for a conversion

These come from the Government Code as summarized in HCD’s March 2026 ADU Handbook. They apply in both the City and the County.

• No setback for the existing footprint. No setback can be required for an ADU or JADU created within an existing accessory structure, or for one rebuilt in the same location and to the same dimensions. Under the state-standards path the unit must still have side and rear setbacks sufficient for fire and safety; the City of Sacramento sets those during building permit review at no more than four feet.
• No replacement parking. When a garage, carport or covered parking structure is converted to an ADU, the agency cannot require the lost parking to be replaced. A JADU converted from an attached garage cannot be required to provide parking.
• Height stays where it is. A conversion’s height is limited to the dimensions of the original structure, and local height, lot coverage and design standards do not apply to it.
• 150 square feet for access. An ADU converted from an accessory structure may expand up to 150 square feet beyond the structure’s footprint, solely for ingress and egress, such as a stair or entry. HCD states this allowance does not apply to JADUs.
• Sprinklers only if the house needs them. Fire sprinklers cannot be required in the ADU or JADU unless the primary residence is required to have them, and the conversion cannot trigger a sprinkler requirement for the house.
• Ministerial review and deadlines. The agency must tell you within 15 business days whether the application is complete, and approve or deny a complete application within 60 days. Review uses objective standards only; there is no public hearing.
• Utilities. A conversion under the state standards cannot be required to install a new or separate utility connection, and an ADU built from existing space is not treated as a new residential use when calculating connection fees or capacity charges.
• Nonconforming conditions. For a unit approved under the state standards, the agency cannot make approval conditional on correcting existing nonconforming zoning conditions on the lot.

On a single-family lot the state standards allow one converted ADU, one JADU and one new detached ADU together. In the City of Sacramento you choose either the state standards or the city’s local ordinance for the ADUs on your lot; the ADU rules guide explains that choice.

What the inspection actually checks

Sacramento County describes converting an accessory structure as a change of use under the building code, requiring the structure to meet current residential building standards. HCD says the same of every conversion: it must meet the building, health, safety and fire standards for dwellings. In practice that means the following.

The floor. The City of Sacramento’s inspection sequence runs foundation, framing (with rough plumbing, mechanical and electrical), insulation, drywall and other interim checks, then finals; it uses a separate inspection checklist for slab-on-grade work (CDD-0401). A garage slab is usually lower than the house floor and was never detailed as a living-space floor. Whether you build up a framed floor or finish the slab directly is a design decision that affects ceiling height and the door thresholds, so settle it before drawings.

Ceiling height. Habitable rooms and hallways need a ceiling height of at least 7 feet; bathrooms need 6 feet 8 inches (California Residential Code R313.1). Measure your garage’s ceiling and subtract whatever the new floor and ceiling assemblies will take up.

Insulation and Title 24 energy compliance. The California Energy Commission treats converting an unconditioned garage into conditioned space as an addition, which must comply with Section 150.2(a) of the 2025 Energy Code. The County submittal list requires the Title 24 forms with the plans. The CEC also states that an attached ADU, being an addition, is not required to add solar PV. The large garage-door opening gets framed in and becomes part of the insulated wall that has to meet those requirements.

Emergency escape from bedrooms. Every sleeping room needs an operable emergency escape opening with at least 5.7 square feet of net clear opening (5 square feet at grade floor), at least 24 inches high and 20 inches wide, with the sill no more than 44 inches above the floor (CRC R319). A bedroom with a door opening directly to a yard that leads to a public way is exempt. Garages rarely have windows that meet this, so plan new openings.

Fire separation from the house. An attached garage converted into an ADU creates two dwelling units in one building. The walls and floor/ceiling assemblies between them need a 1-hour fire-resistance rating, or half an hour if the building is fully sprinklered (CRC R302.3). Sacramento County’s guidelines treat a JADU differently: for fire and life-safety rules, a JADU is not considered a separate dwelling unit. Both ADUs and JADUs need their own exterior entrance. If you convert only part of a garage, no opening may lead from the remaining garage directly into a sleeping room, and any other door between them must be solid-core, 20-minute rated or equivalent, self-closing and self-latching (CRC R302.5.1).

Electrical. Wiring is inspected at the framing stage and again at final. A converted garage usually adds a kitchen, bathroom, heating and cooling, and often a water heater. Check what your existing panel and service can carry before design rather than after plan check asks.

No one may move in until every final inspection is approved; state law requires a certificate of occupancy before anyone lives in an ADU or JADU.

ADU or JADU from an attached garage

An attached garage can become either. A detached garage can only become an ADU.

	ADU from a garage	JADU from an attached garage
Size	The existing structure, plus up to 150 sq ft for access	500 sq ft of interior livable space
Kitchen	Full kitchen	Efficiency kitchen at minimum
Bathroom	Its own	Its own, or shared with the house
Entrance	Separate exterior entrance	Separate exterior entrance; interior entrance to the house required if the bathroom is shared
Owner-occupancy	Cannot be required	Required only if the bathroom is shared (since January 1, 2026)
Deed restriction	—	City of Sacramento: recorded before final inspection. County: required for a shared-bathroom JADU
Short-term rental	Depends on jurisdiction and approval path	Prohibited; rentals must exceed 30 days
Fire separation	Treated as a separate dwelling unit	County: not treated as a separate dwelling unit

A JADU is the smaller project: no separate bathroom is required, and the 500 sq ft cap keeps the scope contained. An ADU is the larger one, and the only option for a detached garage. If the JADU shares a bathroom, the owner has to live on the property, either in the JADU or the main house.

What to check before you call anyone

1. Confirm your jurisdiction and zoning. Your parcel record shows whether you are in the City or the County. In the County, an AR or AG zone rules out an ADU or JADU.
2. Confirm the garage is permitted. A garage built or altered without permits changes what the plans must show.
3. Measure the ceiling. If it can’t clear 7 feet after a new floor and ceiling, the project needs a different design.
4. Decide ADU or JADU. That turns on whether the garage is attached, whether you want a shared bathroom, and whether you will live on site.
5. Look at your electrical panel and note its rating. It is the first question a designer will ask.

For how we scope ADU and addition work, see Additions and ADUs.