Everything homeowners ask about building an ADU in Sacramento — answered with 2026 data.
Yes, ADUs are allowed in Recommend replacing the zone list with the code's actual test, which is not a zone letter. ADUs and JADUs appear as ACCESSORY uses in the residential zone use tables — I confirmed this directly in R-1 (17.204.210(C)) and R-2 (17.204.510(C)), each listing 'Dwelling unit, accessory' and 'Dwelling unit, junior accessory' subject to 17.228.105 — and 17.228.105(C) applies ministerial approval 'within a residential or mixed-use zone'. The operative gate under the local option is 17.228.105(B)(2)(a)(i): the lot must already be improved with, or be concurrently building, a single-unit, duplex or multi-unit dwelling. Add the two real exclusions our page misses: ADUs are PROHIBITED in the EA-1 Executive Airport clear zone and limited to one unit in EA-2/EA-3 (17.312.060); and an ADU in one of the city's 31 historic districts or on a landmark property must meet the city's ADU Design Standards for Historic Properties. NOTE: I did not open the use table for every zone in our current list, so the enumeration as written is not something I can stand behind — see confidence note. in Sacramento, CA. The maximum size for a detached ADU is Local option (17.228.105(B)): 1,200 sq ft — but this is a COMBINED cap. Two detached ADUs on one lot must together stay within 1,200 sq ft (e.g. 400 + 800). State option (17.228.105(C)): 800 sq ft for a detached new-construction ADU. MORE GENEROUS than the state floor for a single unit; the combined-cap nuance is missing from our record.. Attached ADUs can be up to WRONG AS WRITTEN. The cap is the GREATER of. Sacramento has an ADU-friendliness score of 8/10. Check our full Sacramento ADU rules page for complete zoning details.
ADU construction in Sacramento typically costs $100,000-$250,000. The cost per square foot averages $150-$300. Garage conversions are more affordable at $60,000-$140,000, while prefab ADUs cost $80,000-$200,000. Permit fees add Replace the guessed range with the city's OWN published figures. Form CDD-0419, 'Accessory Dwelling Unit (ADU) Fee Estimate (New Construction)', revised 07-12-2026, at a $170.80/sq ft valuation: 749 sq ft = $5,271.90 total; 750 sq ft = $10,624.40; 1,200 sq ft = $14,842.50. Representative line items at 1,200 sq ft: building permit $1,790.36, building plan review $751.95, fire dept administrative $176, fire inspection $294 ($0.11/sq ft, $294 minimum), fire plan review $260, planning inspection $526, planning review $263, public works review $205 deposit + hourly, utilities $205 deposit + hourly, construction excise tax $945.60, general plan fee $533 ($2.60 per $1,000 valuation), residential construction tax $315, technology fee $254.23. NOT included and additional: school district impact fees (calculated and collected by the district, form CDD-0226), Regional Sanitation and Sewer Development fees (the form says 'Check with County'), and possible sewer/water tap, housing and project-area impact fees. The optional ADU Zoning Review is now $0 (the $117 fee was waived). An optional building permit fee estimate service costs $164 (form CDD-0278). Additional review time bills at $216/hr building, $263/hr planning. The city's own caveat: 'This is only an estimate. The actual fees can vary based on project scope, location, fee changes, etc.' to your budget. See our detailed Sacramento ADU cost guide.
Detached ADUs in Sacramento can be up to Local option. Attached ADUs are limited to WRONG AS WRITTEN. The cap is the GREATER of. Junior ADUs (JADUs) have a cap of 500 sq ft. Correct — city adopts the state maximum. Must be within the walls of a single-unit dwelling (which may include an attached garage), with its own separate entrance and an efficiency kitchen. If it has no separate bathroom it must also have an interior entry to the main living area.. Maximum height is WRONG for the local option — this is the single most valuable correction. Local option (17.228.105(B)(2)(c)(ii)): the height limit of the underlying zone applies to the ADU. That is 35 ft in R-1 (17.204.220(A)) and 35 ft in R-2 (17.204.520(A)). State option (17.228.105(C)): 18 ft, or 20 ft where extra height is needed to align the roof pitch with the primary dwelling. FAR MORE GENEROUS than the state floor — note the city even beats the state floor inside its by-right lane (18 ft base rather than 16 ft, 20 ft rather than 18 ft with pitch).. You are allowed up to UNDERSELLS BADLY. Local option on a qualifying lot.
Rear setback: Local option: NO rear-yard setback required for a single-storey ADU, or the first floor of a multistorey ADU, if the whole unit is more than 60 ft from the front property line. If any part is within 60 ft of the front property line, or for the second floor and above, the minimum is the zone's rear-yard setback or 3 ft, whichever is LESS. No setback at all for an existing structure converted to an ADU. State option: 4 ft. MORE GENEROUS than we say. Local overrides: no ADU may project into the levee setback (20 ft from the landside toe for development under 5 acres, 17.204.240(E)); and no balcony/deck/open-stair landing within 10 ft of the rear lot line may sit more than 3 ft above ground unless that line abuts an alley, street or non-residential use.. Side setback: Interior side yard: same rule as rear — zero for a single-storey unit (or first floor) more than 60 ft back from the front property line; otherwise the zone's setback or 3 ft, whichever is less. State option: 4 ft. STREET side yard is the exception and cuts the other way: under the local option an ADU must meet the zone's full street side-yard setback, which is 12.5 ft in R-1 (17.204.240(C)) — materially STRICTER than the 4 ft state floor and a real constraint on corner lots. FLAG: the city's defence is presumably that an applicant can always elect the 17.228.105(C) state lane and get 4 ft instead, so the local option reads as an opt-in alternative rather than an imposed standard. Worth watching, not worth asserting as preempted.. Front setback: Correct as far as it goes but incomplete. The zone's front-yard setback applies (in R-1 it is contextual — matched to the two nearest buildings on the block, or 20 ft if there is no other building on that block face). MORE GENEROUS addition our record omits: one ADU of 800 sq ft or less may be built INSIDE the front-yard setback if the rear and side yard area cannot accommodate either a two-storey detached ADU of at least 800 sq ft or an attached ADU of at least 800 sq ft. That is a genuine local escape hatch for deep-house/shallow-yard lots.. Note that garage conversions may be exempt from setback requirements if the existing structure is already within the setback area.
Right answer, understated reason. Sacramento has abolished minimum off-street vehicle parking CITYWIDE for every land use, not just for ADUs — 17.608.030(B). Separately, 17.608.020(K) provides that when existing parking is removed to build an ADU or JADU, no replacement parking is required for the ADU or for any other dwelling unit on the lot. That means a garage conversion triggers no replacement-parking obligation for the main house either. MORE GENEROUS and more robust than the state exemptions.. Many cities and states have been relaxing ADU parking requirements in recent years. In California, no additional parking is required for ADUs near transit.
MISLEADING — correct for ADUs, wrong for JADUs. No owner-occupancy requirement is imposed on an ADU. But 17.228.105(B)(3)(b) requires the owner to reside onsite for ANY JADU, with the only carve-out being ownership by a government agency, land trust or housing organization — there is NO exception for a JADU that has its own bathroom. FLAG AS LIKELY PREEMPTED: Gov. Code 66333(b) (as amended by AB 1154, eff. 1/1/2026) permits a JADU owner-occupancy requirement only where the JADU SHARES sanitation with the primary dwelling. The city's code has not been conformed. Recommend publishing this as 'the city code still requires it for all JADUs; state law appears to limit that to shared-bathroom JADUs — confirm with Planning before relying on either reading' rather than picking a side.. Note that owner-occupancy rules vary by state law — California and several other states have eliminated this requirement for standard ADUs.
The ADU permit review timeline in Sacramento is typically 60 days — correct, and this is genuinely in the CITY's code, not merely restated state law, which is worth saying. Two conditions our record omits: (1) the 60 days runs from a COMPLETE application and only where there is an existing residential use on the lot; (2) if the ADU is filed alongside an application for new residential development, the city may defer the ADU decision until the primary is approved, and the clock tolls for any applicant-requested delay. Deemed-approved remedy is in the code text. Separately, AB 1332 preapproved plans carry a 30-day approval — but see pre_approved_plans, the city's AB 1332 catalog is currently empty, so no homeowner can actually use that 30-day path today.. Plan check: Standard review. Pre-approved plans availability: True but it conflates two distinct programmes, and only one of them actually has plans in it today. (1) SHELF READY ADU PLANS — three free city-designed detached plan sets: studio 367, one-bedroom 559, two-bedroom 747 habitable sq ft. All-electric, meet 2022 Residential Building Code, also loaded into Symbium Build for site planning. Modifications are NOT allowed, though mirroring is; the applicant supplies a site plan. All three are deliberately under the 750 sq ft impact-fee threshold — a homeowner using the two-bedroom plan saves roughly $5,350 in impact fees versus a 750 sq ft custom unit. (2) AB 1332 PREAPPROVED ADU PROGRAM (Gov. Code 65852.27) — the city has stood up the required process and web page for third-party preapproved plans, but the catalog is CURRENTLY EMPTY: the page says 'Check back for regular updates' with no plans listed. Either route still requires site-specific planning and zoning approval before permit issuance. Recommend our page distinguishes the two and states the shelf-ready sizes, since that is the concrete saving..
Average ADU rental income in Sacramento: 1-bedroom units rent for $1,300-$1,800/month, 2-bedroom units for $1,600-$2,200/month. Short-term rentals: Allowed with permit in certain zones. Expected ROI: 8-12% annual return.
The minimum lot size for an ADU in Sacramento is No minimum — correct, and I read 17.228.105 end to end to confirm it imposes no minimum lot size, lot width or lot depth on an ADU. Worth adding the related local benefit: an ADU occupying under 800 sq ft of lot coverage is exempt from the zone's maximum lot coverage AND minimum open-space requirements (R-1/R-2 lot coverage is otherwise capped at 40% or 2,500 sq ft, whichever is greater, never above 50%). The 5,200 sq ft interior / 6,200 sq ft corner minimums in 17.204.230 and 17.204.530 govern lot creation, not ADU eligibility, and should not be quoted at homeowners as an ADU barrier.. This applies to detached ADUs — garage conversions and JADUs may have different or no lot size requirements.
Garage conversions are one of the most popular and affordable ADU options. In Sacramento, a garage conversion typically costs $60,000-$140,000. The key advantages are lower cost (no foundation work), potential setback exemptions, and faster permitting. Read our complete garage conversion guide.
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