Rancho Cordova approves ADUs ministerially — a building permit, no hearing, no discretionary review — with four-foot side and rear setbacks and no city impact fees at all on a unit under 750 sq ft. What the city publishes, though, is only half the picture. The Planning Department's own ADU standards describe a single local pathway: one attached or detached ADU plus one junior ADU, capped at 850 sq ft for a studio or one-bedroom and 1,000 sq ft with two or more bedrooms, a detached unit no taller than 16 feet, and one off-street parking space per unit. Running alongside that, and expressly overriding it, is the state pathway at Government Code §66323, which begins "Notwithstanding Sections 66314 to 66322" and requires ministerial approval of up to three units on a single-family lot — one ADU converted from existing space, one junior ADU, and one newly built detached ADU of up to 800 sq ft. The two are separate routes, not a menu you can combine, and the city's published material does not mention the second one. A second gap worth knowing: the height rule the city publishes predates SB 543, which took effect January 1, 2026 and requires an extra two feet to match the primary dwelling's roof pitch.
Zoning & Size Requirements [1][2][3][4][5][6][7][8]
Yes — Rancho Cordova allows ADUs. A detached ADU can typically be up to 850 sq ft under current California and Rancho Cordova zoning rules.
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| Allowed Zones | Zones that allow single-family homes, per the City of Rancho Cordova Planning Department's ADU standards, which are set out at Rancho Cordova Municipal Code §23.901.060 (ADUs) and §23.901.065 (JADUs). Under the state pathway an ADU must be ministerially approved on a lot in any residential or mixed-use zone with a proposed or existing dwelling (Gov. Code §66323(a)), and state law bars a local agency from imposing any minimum lot size requirement on an ADU (Gov. Code §66314(b)(1)). Note a sourcing limit on this entry: the codified text of RCMC 23.901.060 could not be opened — the City links its code to the eCode360 platform (ecode360.com/RA4605), which presents a bot-verification challenge that was not bypassed. Everything below the state-law citations comes from the City's own published ADU standards. Confirm your parcel with Rancho Cordova Planning at (916) 851-8750 or PlanningServices@cityofranchocordova.org |
| Max Size (Detached) | 850 sq ft for a studio or one-bedroom unit, 1,000 sq ft for a unit with two or more bedrooms (City of Rancho Cordova ADU Development Standards, RCMC 23.901.060). Those are exactly the floors state law guarantees and no more: a local agency may not set a maximum under 850 sq ft, or under 1,000 sq ft for an ADU with more than one bedroom (Gov. Code §66321(b)(2)). Lot coverage applies "per the zoning district standards," but with a statutory floor underneath it — no lot coverage, floor area ratio, open space, front setback or minimum lot size requirement may prevent an ADU of at least 800 sq ft of interior livable space with four-foot side and rear yard setbacks (Gov. Code §66321(b)(3)). Read that carefully against the City's own footnote, which applies the same protection only to an "attached" 800 sq ft ADU; the statute is not limited to attached units. Under the separate state pathway a newly built detached ADU is capped at 800 sq ft (Gov. Code §66323(a)(2)(A)) |
| Max Size (Attached) | 850 sq ft for a studio or one-bedroom, 1,000 sq ft for two or more bedrooms — and separately, total floor area may not exceed 50 percent of the primary dwelling (City of Rancho Cordova ADU Development Standards; Gov. Code §66314(d)(4), which applies the 50 percent rule where there is an existing primary dwelling). An attached ADU must have exterior access separate from the main entrance to the primary dwelling |
| Max Size (JADU) | 500 sq ft, entirely contained within an existing or proposed single-family residence, with an efficiency kitchen, and with either its own separate sanitation facilities or facilities shared with the single-family structure (City of Rancho Cordova ADU FAQ; RCMC 23.901.065). No additional off-street parking may be required for a JADU |
| Max Height | 16 feet for a detached ADU, rising to 18 feet where the lot is within one-half of one mile walking distance of a major transit stop or a high-quality transit corridor; 25 feet, or the zoning district's height limit for the primary dwelling if that is lower, for an attached ADU (City of Rancho Cordova ADU Development Standards). Those match Gov. Code §66321(b)(4)(A), (B) and (D) — but the City's published table omits the sentence that follows: "A local agency shall also allow an additional two feet in height to accommodate a roof pitch on the accessory dwelling unit that is aligned with the roof pitch of the primary dwelling unit." That allowance is current law as amended by SB 543, effective January 1, 2026. If a plan reviewer holds you to a flat 18 feet on a transit-proximate lot, cite the statute |
| Max Units | Depends which pathway you use, and they are separate routes rather than a menu. Local option, as the City publishes it: one attached or detached ADU plus one junior ADU on a lot with a single-family dwelling. State option (Gov. Code §66323), which opens "Notwithstanding Sections 66314 to 66322, inclusive": ministerial approval of one ADU and one JADU created within the proposed or existing space of a single-family dwelling or an accessory structure — with an expansion of not more than 150 square feet beyond the existing accessory structure's dimensions, limited to ingress and egress — plus one detached, new-construction ADU with four-foot side and rear setbacks, which the city may cap at 800 sq ft of livable space. That is up to three units on a single-family lot. On multifamily property the state route allows at least one and up to 25 percent of the existing units as interior conversions, plus up to eight detached ADUs on a lot with an existing multifamily dwelling (never more than the existing unit count) or two on a lot with a proposed one. The City's published ADU material does not describe the §66323 route — raise it in writing if you want it |
Setback Requirements [1][2][3][4][5][6][7][8]
Rancho Cordova requires a rear setback of about 4 ft for a detached ADU, and parking requirements vary by unit size or location. Owner-occupancy is not required — you can rent it out without living on the property.
| Rear Setback | 4 feet (City of Rancho Cordova ADU Development Standards), which is the maximum state law permits for a new ADU: "a setback of no more than four feet from the side and rear lot lines shall be required for an accessory dwelling unit that is not converted from an existing structure" (Gov. Code §66314(d)(7)). No setback at all may be required for an existing living area or accessory structure converted to an ADU, or for a new structure built in the same location and to the same dimensions as an existing structure. The City notes these are general standards that may vary with existing easements |
| Side Setback | 4 feet, on the same statutory footing as the rear setback (City of Rancho Cordova ADU Development Standards; Gov. Code §66314(d)(7)). A 6-foot building separation applies between the ADU and the primary dwelling |
| Front Setback | The zoning district's front yard setback for the primary dwelling (City of Rancho Cordova ADU Development Standards). It cannot be applied so as to block a compliant unit: Gov. Code §66321(b)(3) bars any front setback requirement that does not permit an ADU of at least 800 sq ft of interior livable space with four-foot side and rear yard setbacks, built in compliance with all other local development standards |
| Parking Required | One off-street space, covered or uncovered, per attached and detached ADU — the City's table reads "for each attached and detached accessory dwelling unit or bedroom" — and spaces may be tandem on a driveway. No additional parking is required for a JADU. State law caps this: "Parking requirements for accessory dwelling units shall not exceed one parking space per accessory dwelling unit or per bedroom, whichever is less" (Gov. Code §66314(d)(10)(A)) — whichever is less, so a two-bedroom ADU still owes one space, not two. Far more useful is the exemption list at Gov. Code §66322(a), which applies "whether or not the local agency has adopted an ordinance": no parking standard at all may be imposed where the ADU is within one-half of one mile walking distance of public transit, within an architecturally and historically significant historic district, part of the proposed or existing primary residence or an accessory structure, where on-street parking permits are required but not offered to the ADU's occupant, where a car share vehicle sits within one block, or where the ADU application is filed with an application for a new dwelling on the same lot. The City points to RCMC 23.901.060(L) for its own exemption list. And if you demolish or convert a garage, carport or parking space to build the ADU, the city may not require you to replace those spaces (Gov. Code §66314(d)(11)) |
| Owner Occupancy | Not required, and it may not be. "No additional standards, other than those provided in Section 66314, shall be used or imposed, including an owner-occupant requirement, except that a local agency may require that the property may be used for rentals of terms 30 days or longer" (Gov. Code §66315). Rancho Cordova does use that one permitted exception — the City's ADU FAQ states the ADU may only be rented for a period longer than 30 days. Junior ADUs are the one place California still allows an owner-occupancy condition in some circumstances; confirm with Planning at (916) 851-8750 whether a JADU deed restriction applies to your permit |
| Min Lot Size | No minimum. State law is explicit that a local agency's objective ADU standards "shall not include requirements on minimum lot size" (Gov. Code §66314(b)(1)), and an ADU conforming to §66314 "shall not be considered to exceed the allowable density for the lot upon which it is located" and is deemed a residential use consistent with the general plan and zoning designations (Gov. Code §66319) |
Permit Process & Fees [9][10][11][12][13]
An ADU permit in Rancho Cordova goes through a ministerial, by-right review. Typical timeline: The permitting agency must determine whether the application is complete and give written notice within 15 business days, and must approve or deny within 60 days of receiving a complete application where there is already a single-family or multifamily dwelling on the lot (Gov. Code §66317(a)(2)-(3)). If it misses the completeness deadline, the application is deemed complete. Where the ADU application is filed together with an application for a new primary dwelling, the agency may hold the ADU decision until it decides the primary. The City publishes an Estimated Project Review Timelines sheet for residential permits — ask Building and Safety at (916) 851-8760 for the current version. Permit fees: Confirm current building permit and plan check amounts with Rancho Cordova Building and Safety at (916) 851-8760 — the City publishes a Building Permit Fee Estimates tool rather than a flat ADU fee, and no ADU-specific fee schedule appears in its ADU material.
| Approval Process | Ministerial. "A permit application for an accessory dwelling unit shall be considered and approved ministerially without discretionary review or a hearing" (Gov. Code §66317(a)(1)) — no use permit, no variance, no Planning Commission. In practice it is a building permit: a completed building permit application with all submittal requirements, filed electronically with the Building Department through the City's online portal. Building and Safety takes application questions at (916) 851-8760 or PermitServices@cityofranchocordova.org; Planning is at (916) 851-8750 or PlanningServices@cityofranchocordova.org, 2729 Prospect Park Drive. A detached ADU can be assigned its own address on request during the building permit process provided it is physically detached, has separately billed and installed utilities and a mail receptacle; JADUs and attached ADUs cannot (contact Public Works at 916-851-8710). A local agency may not require correction of nonconforming zoning conditions as a condition of ministerial approval, nor deny an application because of unpermitted structures that do not threaten health and safety and are unaffected by the ADU (Gov. Code §66323(c) and §66322(b)) |
| Review Timeline | The permitting agency must determine whether the application is complete and give written notice within 15 business days, and must approve or deny within 60 days of receiving a complete application where there is already a single-family or multifamily dwelling on the lot (Gov. Code §66317(a)(2)-(3)). If it misses the completeness deadline, the application is deemed complete. Where the ADU application is filed together with an application for a new primary dwelling, the agency may hold the ADU decision until it decides the primary. The City publishes an Estimated Project Review Timelines sheet for residential permits — ask Building and Safety at (916) 851-8760 for the current version |
| Permit Fees | Confirm current building permit and plan check amounts with Rancho Cordova Building and Safety at (916) 851-8760 — the City publishes a Building Permit Fee Estimates tool rather than a flat ADU fee, and no ADU-specific fee schedule appears in its ADU material |
| Impact Fees | None at all below 750 sq ft. "No city-imposed impact fees shall be charged for an accessory dwelling unit that is less than 750 square feet in size. For accessory dwelling units 750 square feet or larger, city-imposed impact fees shall be charged proportionately in relation to the square footage of the primary dwelling" (City of Rancho Cordova ADU FAQ, Planning Department). That is the single largest cost lever on a Rancho Cordova ADU: a 749 sq ft unit and a 760 sq ft unit are not 11 square feet apart on the fee bill. School district and utility district fees are separate — the City's ADU FAQ lists Sacramento Area Sewer District (916-876-6100), Sacramento County Water Agency (916-874-6851), SMUD (916-732-5700), Golden State Water (1-800-999-4033), California American Water (916-568-4251) and Sacramento Metro Fire District (916-859-4330) as the agencies to contact |
| Plan Check | Building Division plan check as part of the building permit. Fire sprinklers are required in a newly built ADU only where the existing primary dwelling has an automatic residential sprinkler system; a dwelling built before sprinklers were required does not have to add one to take an attached ADU (City of Rancho Cordova ADU FAQ), which tracks Gov. Code §66314(d)(12) — an ADU may not be required to provide fire sprinklers if they are not required for the primary residence, and building an ADU may not trigger sprinklers in the existing house. The ADU structure may require photovoltaic panels under the California Energy Code. Construction of an ADU does not by itself constitute a Group R occupancy change under the local building code unless the building official makes a written finding on substantial evidence of a specific adverse impact on public health and safety (Gov. Code §66314(d)(8)) |
| Pre-Approved Plans | None found in a City of Rancho Cordova source as of September 1, 2026 — the City's ADU FAQ and Planning Division document library list no preapproved or permit-ready ADU plan programme, unlike neighbouring Citrus Heights, which gives its plans away free. Confirm with Rancho Cordova Planning at (916) 851-8750 before commissioning a full custom set |
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Construction Costs [14]
Building an ADU in Rancho Cordova typically costs $155,000-$310,000 ($250-$410 per sq ft); a garage conversion runs $80,000-$155,000.
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| Average Build Cost | $155,000-$310,000 |
| Cost per Sq Ft | $250-$410 |
| Garage Conversion | $80,000-$155,000 |
| Prefab ADU (Installed) | $120,000-$255,000 |
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Rental Income Potential [15][16]
A 2-bedroom ADU in Rancho Cordova rents for around $1,800-$2,250/mo, an estimated 6-9% annual return.
| Avg Rent (1 Bedroom) | $1,500-$1,850/mo |
| Avg Rent (2 Bedroom) | $1,800-$2,250/mo |
| Short-Term Rental | No. "The ADU can only be rented for a period longer than 30 days" (City of Rancho Cordova ADU FAQ), which is the one rental condition California still lets a city impose (Gov. Code §66315), and which Gov. Code §66323(e) requires for any unit created under the state ministerial pathway. Airbnb-style letting of the ADU is out; a 31-day-plus tenancy is the shortest lawful term. Separately, the ADU generally cannot be sold or conveyed apart from the primary dwelling (Gov. Code §66314(d)(1); see the narrow exception in Article 4, Gov. Code §§66340-66342) |
| Est. Annual ROI | 6-9% annual return |
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Recent Law Changes
What's Changed Recently
- California's ADU statutes were renumbered out of Gov. Code §65852.2 into a new Chapter 13, Gov. Code §§66310-66342, by SB 477 effective March 25, 2024. Local ordinances and handouts that still cite §65852.2 are citing a repealed section
- SB 543 (Stats. 2025, Ch. 520), effective January 1, 2026, amended Gov. Code §66321 — the size and height section — and §66323, the multiple-unit ministerial pathway. The height rule now expressly requires a local agency to allow an additional two feet above the 16 or 18 foot detached limit to accommodate a roof pitch aligned with the primary dwelling's; the City's published ADU standards table does not reflect it
- AB 1170 (Stats. 2025, Ch. 67), effective January 1, 2026, amended Gov. Code §66314, the core standards section for ADUs on single-family lots
- SB 9 (Stats. 2025, Ch. 510), effective January 1, 2026, amended Gov. Code §66326, the HCD ordinance-review section: where a city does not amend a non-compliant ADU ordinance or adopt findings explaining why it complies, HCD may notify the Attorney General, and an ordinance not submitted or defended within the statutory windows "shall be null and void"
- Gov. Code §66316 states that an existing local ADU ordinance that fails to meet the requirements of the state article "shall be null and void and that agency shall thereafter apply the standards established in this article." Gov. Code §66325(a) puts it more simply: the state article supersedes a conflicting local ordinance, though §66325(b) leaves cities free to be less restrictive
- Sourcing note for this entry: the codified text of RCMC 23.901.060 could not be read. The City links its municipal code to eCode360 (ecode360.com/RA4605), which serves a bot-verification challenge; that challenge was not bypassed. The standards recorded here come from the City of Rancho Cordova Planning Department's own published ADU FAQ and development standards table, which cites RCMC 23.901.060 throughout. Verify against the code itself or with Planning at (916) 851-8750 before relying on any figure
Tips for Building an ADU in Rancho Cordova
- Ask about the state pathway by name. Gov. Code §66323 opens "Notwithstanding Sections 66314 to 66322, inclusive" and requires ministerial approval of a conversion ADU plus a junior ADU plus a new detached ADU of up to 800 sq ft — three units where the City's published local option gives you two. It is a separate route, not something you bolt onto the local standards
- Draw the line at 749 sq ft if fees decide the project. No city-imposed impact fee is charged on an ADU under 750 sq ft; at 750 and above they are charged proportionately against the primary dwelling's square footage
- The 16-foot detached height limit is not the whole rule. SB 543 requires an extra two feet to accommodate a roof pitch aligned with the house, and 18 feet applies within half a mile walking distance of a major transit stop or high-quality transit corridor — check your parcel against the transit map before you flatten the roof
- Check the §66322 parking exemptions before you give up a driveway space. Within half a mile walking distance of public transit, inside the primary residence or an accessory structure, or with a car share vehicle within a block, no parking standard may be imposed at all
- Converting a garage? The city cannot make you replace the parking you lose (Gov. Code §66314(d)(11)), and no setback may be required where you convert an existing structure or rebuild in the same footprint (Gov. Code §66314(d)(7))
- If a reviewer applies lot coverage to shrink your unit below 800 sq ft, quote Gov. Code §66321(b)(3). It bars any lot coverage, floor area ratio, open space, front setback or minimum lot size requirement that stops an 800 sq ft ADU with four-foot side and rear setbacks — and unlike the City's own footnote, the statute is not limited to attached units
- Track the clock. Fifteen business days for a completeness determination, sixty days to approve or deny once complete where a dwelling already exists on the lot (Gov. Code §66317(a)(2)-(3))
- Plan for a long-term tenant. Rancho Cordova requires ADU tenancies longer than 30 days, so a short-let business model is not available — and a detached ADU can get its own address, which makes a conventional tenancy much easier to run
ADU Builders in Rancho Cordova
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Sources & References
All data on this page is sourced from official government records and verified market data. View our full methodology.
- Accessory Dwelling Units: Frequently Asked Questions — City of Rancho Cordova Planning Department (ADU and JADU development standards table, citing RCMC 23.901.060) Planning Department — Accessed 2026-09-01
- Planning Division Document Library — City of Rancho Cordova Planning Department — Accessed 2026-09-01
- Rancho Cordova Municipal Code, Title 23 Zoning Code (eCode360) — could not be opened for this entry; the host serves a bot-verification challenge Municipal Code — Accessed 2026-09-01
- California Government Code §66314 — ADU ordinance standards (Amended by Stats. 2025, Ch. 67 (AB 1170), effective January 1, 2026) state_statute — Accessed 2026-09-01
- California Government Code §66321 — ADU size and height standards (Amended by Stats. 2025, Ch. 520 (SB 543), effective January 1, 2026) state_statute — Accessed 2026-09-01
- California Government Code §66322 — Parking exemptions and nonconforming conditions state_statute — Accessed 2026-09-01
- California Government Code §66323 — Ministerial approval of multiple ADUs and JADUs (Amended by Stats. 2025, Ch. 520 (SB 543), effective January 1, 2026) state_statute — Accessed 2026-09-01
- California Government Code §66315 — No additional standards; no owner-occupant requirement state_statute — Accessed 2026-09-01
- California Government Code §66317 — Ministerial review, 15-business-day completeness, 60-day decision state_statute — Accessed 2026-09-01
- California Government Code §66316 — Non-compliant local ADU ordinance null and void state_statute — Accessed 2026-09-01
- California Government Code §66325 — State article supersedes conflicting local ordinance state_statute — Accessed 2026-09-01
- California Government Code §66326 — HCD ordinance review (Amended by Stats. 2025, Ch. 510 (SB 9), effective January 1, 2026) state_statute — Accessed 2026-09-01
- Building and Safety Forms and Downloads — City of Rancho Cordova Planning Department — Accessed 2026-09-01
- Angi — ADU Construction Cost Data Market Data — Accessed 2026-09-01
- Zillow Rental Manager — Market Rent Data Market Data — Accessed 2026-09-01
- HUD Fair Market Rents Government Data — Accessed 2026-09-01
- California Department of Finance, Report E-1: Population and Housing Estimates for Cities, Counties, and the State, January 1, 2025 and 2026 Government Data — Accessed 2026-09-01
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