Two Rulebooks, One Choice.
Sacramento gives homeowners a choice that most California cities do not. Every ADU project follows either the local ADU ordinance (City Code Section 17.228.105(B)) or state ADU standards (Section 17.228.105(C) and Government Code Section 66323), and you pick whichever set works better for your lot. The city lays both paths out side by side on its ADU Resource Center.
Under the local ordinance, a single-family lot can have two ADUs in any combination of attached, detached, or junior ADU. Under state standards, the same lot can have up to three units: one attached conversion, one junior ADU of up to 500 square feet, and one detached ADU. The main trade-offs are size and height, covered below, plus one wrinkle: short-term rental of an ADU is allowed only under the local ordinance (subject to Section 17.228.104) and prohibited under the state path. Properties in the EA-2 or EA-3 overlay zones are limited to one ADU per lot, and Sacramento's 31 historic districts allow ADUs as long as they follow the city's design standards for historic properties. Not sure which rules apply to your address? Check your lot and we will map it for you.
Size, Setbacks, and Height.
The local ordinance is where Sacramento gets generous. Detached ADUs can total 1,200 square feet on a lot, and attached ADUs can be 50% of the primary residence, or 850 square feet, or 1,000 square feet with two or more bedrooms, whichever is greater. Setbacks are just 3 feet at interior side and rear lot lines when the ADU sits within 60 feet of the front property line, and if the entire unit is at least 60 feet back, the first floor needs no side or rear setback at all. Detached ADUs must keep 4 feet of separation from each other and from the main house.
Height under the local ordinance follows the underlying zone, so an ADU on an R-1 lot can rise to the zone's 35-foot limit, which makes two-story backyard homes a real option here. Choose the state-standards path instead and the numbers tighten to the statewide baseline: detached units up to 800 square feet, 4-foot side and rear setbacks, and 18 feet of height with 2 extra feet allowed to match the main home's roof pitch. One quirk worth knowing: Sacramento even allows one ADU of up to 800 square feet in the front-yard setback area if the rear and side yards cannot fit an 800-square-foot unit, per the city's zoning summary.
Permit Ready Plans and the AB 1332 Program.
Sacramento is one of California's pioneers in pre-approved ADU plans. The city's free Shelf Ready Plans include a 367-square-foot studio, a 559-square-foot one-bedroom, and a 747-square-foot two-bedroom, all-electric designs that meet the Residential Code, and applicants only add a site plan showing placement. Modifications are not allowed, though mirrored layouts are fine.
Alongside those city plans, Sacramento runs a Preapproved ADU program under AB 1332 (Government Code Section 65852.27), which lets any designer submit detached ADU plans for preapproval to streamline permitting and cut plan-review cost. Every preapproved plan still needs site-specific planning, zoning, and permit approval before construction. That is exactly the part Abodu takes off your plate: our homes are engineered, repeatable designs, and our team runs the site-specific approvals for you. See how the process works from first call to move-in.
Multifamily Lots Get Their Own Math.
Own a duplex or apartment property in Sacramento? Under state standards, lots with an existing multi-unit dwelling are eligible for up to 8 detached ADUs, capped at the number of existing units on the lot, while lots with a proposed multi-unit building can add up to 2 detached ADUs. On top of that, at least one ADU, and up to 25% of existing units, can be carved out of non-livable space such as storage rooms, boiler rooms, attics, basements, or garages, per the city's ADU standards page. Detached units on these lots follow the same 4-foot setbacks and 18-foot height rule.
For owners and operators, that is a fast way to add rentable square footage without acquiring land. Abodu builds at multifamily scale too, with factory schedules and fixed pricing that make multi-unit deployments predictable. Learn more about Abodu for multifamily properties.
What It Actually Costs.
Sacramento helps on the fee side: city impact fees are waived for ADUs under 750 square feet per state law, only one water service connection is required per lot so no separate meter tap is needed, and California's permit clock requires the city to approve or deny a complete ADU application within 60 days, per the California HCD ADU program. The city posts its own review targets too, with a first building plan-check cycle of 20 business days.
Construction is where budgets usually break. Custom site-built ADUs in California routinely exceed $250,000 before change orders, and every correction cycle adds carrying cost. Abodu works differently: transparent published pricing: homes from $234,800 plus a published installation price, an expected all-in from $298,800, covering design, permits, factory build, delivery, and installation. Clear allowances, no surprise trenching bill, no month twelve of a backyard construction site. See how the process works, hear from Sacramento-area homeowners and beyond.