Anaheim offers unique ADU opportunities in Orange County, with strong rental demand driven by tourism (Disneyland), Convention Center traffic, and a growing population seeking affordable housing options.
Zoning & Size Requirements [1]
Yes — Anaheim allows ADUs. A detached ADU can typically be up to 1,200 sq ft under current California and Anaheim zoning rules.
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| Allowed Zones | Our zone list is incomplete — it omits the three RH hillside zones and RM-3.5. The code permits ADUs and JADUs in all areas zoned to allow single-family or multiple-family residential use. Single-family zones: RH-1, RH-2, RH-3, RS-1, RS-2, RS-3, RS-4. Multiple-family zones: RM-1, RM-2, RM-3, RM-3.5, RM-4. Two absolute local exclusions we do not mention at all: no ADU or JADU on any parcel that has obtained a permit for an SB 9 Two-Unit Development or Urban Lot Split, and none in any area the City Council designates by resolution as having insufficient sewer infrastructure. |
| Max Size (Detached) | 1,200 sq ft headline cap, but expressly 'subject to 18.04.080.020', which caps the cumulative floor area of ALL enclosed detached accessory structures at the underlying zone's minimum livable floor area (1,700 sq ft in RH-1, RH-2, RH-3 and RS-1; 1,225 sq ft in RS-2, RS-3, RS-4) and further provides it 'shall not exceed the square footage of the main dwelling'. So on a modest primary home the detached ADU is limited to the size of that home. State law still guarantees at least 800 sq ft regardless. |
| Max Size (Attached) | The LESSER of 50% of the main dwelling or 1,200 sq ft — but never reduced below 850 sq ft for a studio or one-bedroom unit, or 1,000 sq ft for a unit with two or more bedrooms. Our current wording omits both 'whichever is less' and the 850/1,000 sq ft floor, so it reads as more generous than the code for large houses and stricter than the code for small ones. |
| Max Size (JADU) | 500 sq ft (unchanged, and correct). Minimum unit size 150 sq ft. Up to 150 sq ft may be added to an existing main dwelling to accommodate ingress or egress, but the overall unit must still not exceed 500 sq ft. Anaheim adopts the state maximum exactly. |
| Max Height | MORE GENEROUS than state law and our current value is wrong. Detached ADU, on any residential lot: 18 ft plus an additional 2 ft for a roof pitch, or the height of the main dwelling unit, whichever is GREATER. This applies to both the sub-800 sq ft and over-800 sq ft categories and is not conditioned on transit proximity or a multifamily lot. Attached ADUs and JADUs: the height standards of the underlying zone. On a multifamily lot, detached ADUs are likewise 18 ft plus 2 ft for roof pitch. |
| Max Units | MORE GENEROUS than we state. On a single-family zoned lot Anaheim allows, in combination: one ADU within the existing or proposed space of the house or an accessory structure (with up to 150 sq ft of expansion for ingress/egress), one new-construction ADU, and one JADU — with a hard ceiling that total dwelling units including the primary 'shall not exceed four (4) units'. On multifamily property: at least one ADU and up to 25% of existing units via interior conversion; up to 8 detached ADUs on a lot with an existing multi-family dwelling, never exceeding the number of existing units; or 2 detached ADUs alongside a proposed multi-family dwelling. |
Setback Requirements [1]
Anaheim requires a rear setback of about 4 ft for a detached ADU, and one off-street parking space is required. Owner-occupancy is set by local rules (confirm with the city).
| Rear Setback | 4 ft (unchanged, and correct — Anaheim adopts the state minimum verbatim in Table 38-A). Worth adding: conversions of legally permitted existing structures are exempt from structural setbacks entirely, and a legally established accessory structure may be demolished and rebuilt as an ADU in the same location and dimension without additional setbacks. Eaves/roof overhang must stay at least 12 inches from the property line. |
| Side Setback | 4 ft (unchanged, and correct — Anaheim adopts the state minimum). Same conversion exemption and 12-inch eave rule as the rear setback. |
| Front Setback | Underlying zone, PLUS a local placement rule our page omits: a detached ADU may be no closer to the front property line than the front-most building wall of the main dwelling, except where the ADU results from converting an existing garage, carport or covered parking structure. An attached ADU above an existing nonconforming structure in the front setback is exempt if it keeps the same location and dimension. The Planning and Building Director may permit a modified front setback where the standard would prevent creation of an 800 sq ft unit — a built-in safety valve that is probably what keeps this rule from being preempted. |
| Parking Required | Substantively right but the CITATION IS WRONG — this comes from AMC 18.42.030.070, not 18.38.015 (which merely cross-references it). Studio ADU: 0 spaces. ADU with one or more bedrooms: 1 space. JADU: 0, always. Parking is waived entirely where the ADU is within a half-mile walking distance of a transit stop, in an architecturally and historically significant historic district, part of the existing/proposed primary residence or an existing accessory structure, where on-street parking permits are required but not offered to the occupant, where a car-share station is within one block, or where a garage/carport is demolished or converted for the ADU. No replacement parking is ever required for a demolished or converted garage. Any required space must be exclusive to the ADU if shared in the main garage. |
| Owner Occupancy | Our JADU half is incomplete and currently misleads. No owner-occupancy requirement for an ADU. For a JADU, owner-occupancy applies ONLY where the JADU SHARES sanitation facilities with the primary residence — a JADU with its own bathroom carries no owner-occupancy requirement at all. Where it does apply: a covenant must be recorded with the Orange County Recorder before the building permit issues, the unit not occupied by the owner may only be rented for 30 or more consecutive days, and the requirement is waived where the owner is a governmental agency, land trust or housing organization. Anaheim tracks Gov. Code 66333(b)/AB 1154 exactly. |
| Min Lot Size | No minimum (unchanged, and correct). I read the complete development standards table and Anaheim imposes no minimum lot size for an ADU or JADU. Worth adding what the table does say: lot coverage is expressly 'Not Applicable' to an ADU of 800 sq ft or less; for an ADU over 800 sq ft, and for a JADU, the underlying zone's lot coverage standards apply. |
Permit Process & Fees
An ADU permit in Anaheim typically costs $3,500-$12,000 and takes '60 days' alone is incomplete. The code sets a two-stage clock: the city must determine whether the application is complete within 15 BUSINESS days, and every resubmittal is subject to the same 15-business-day review period; once deemed complete, the permit must be approved or denied within 60 days. Where the ADU application is filed together with an application for a new primary dwelling, the city may defer the ADU decision until the primary is decided. Separately, via ADU Express the city advertises the review completed in 1-3 days with the building permit issued in as little as one day — but be honest that the city also says the eligibility screening beforehand 'can take a few weeks to complete'., through a ministerial, by-right review.
| Approval Process | Ministerial, reviewed by the Planning and Building Director under Gov. Code 66317, without discretionary review or hearing. Two local features worth publishing: (1) no waiver, administrative adjustment or variance from ANY requirement of 18.38.015 may be approved, and no such application may even be accepted for processing — the standards are hard limits with no relief valve except the front-setback modification noted above; (2) an appeal of a staff determination must itself be decided within 60 days. Three routes exist: standard building review with your own designer, the free Pre-Approved Plan Catalogue used in standard review, or ADU Express. |
| Review Timeline | '60 days' alone is incomplete. The code sets a two-stage clock: the city must determine whether the application is complete within 15 BUSINESS days, and every resubmittal is subject to the same 15-business-day review period; once deemed complete, the permit must be approved or denied within 60 days. Where the ADU application is filed together with an application for a new primary dwelling, the city may defer the ADU decision until the primary is decided. Separately, via ADU Express the city advertises the review completed in 1-3 days with the building permit issued in as little as one day — but be honest that the city also says the eligibility screening beforehand 'can take a few weeks to complete'. |
| Permit Fees | $3,500-$12,000 |
| Impact Fees | The state-law statement is correct and should stay, but it is a restatement of state law, not an Anaheim fact, and it omits the part that actually costs homeowners money. Verified from the city's own ADU Express process page: the Building Division quotes applicable development impact fees AND school district fees, and all fees must be paid before the building permit is issued — the applicant physically pays the school district and returns before the permit issues. Anaheim is served by SIX different school districts, so which district a property falls in determines the school fee. The city publishes separate 'Permit Impact Fees' and 'Developer Impact Fees' schedules. Dollar amounts remain UNVERIFIED for the same access reason as the fees field. |
| Plan Check | Standard city review |
| Pre-Approved Plans | Badly understated — this is the most commercially valuable fact on the page. Anaheim publishes a Pre-Approved Plan Catalogue of four detached ADU plans, each listed 'Free': Plan 001 studio, 224 sq ft; Plan 002 one bedroom / one bathroom, 499 sq ft; Plan 003 two bedroom / two bathroom, 990 sq ft; Plan 004 three bedroom / three bathroom, 1,199 sq ft. Plans include Building Code requirements effective 1 July 2024 and the city says it keeps adding plans. Two ways to use them: in the standard review process, or through ADU Express, an accelerated track for qualified single-family properties where the plans may NOT be modified. ADU Express steps include a free 400-amp multi-meter 'meter spot' from Anaheim Public Utilities (usually within three business days), an in-person site-plan meeting at City Hall, then payment of impact and school fees, after which the permit issues. Eligibility is checked by address through the city's ADU Express Eligibility Tool. Caveat to publish honestly: some catalogue plans still require the owner to hire a design professional for the site plan, Title 24, structural details and soils report. |
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Construction Costs [2][3]
Building an ADU in Anaheim typically costs $130,000-$290,000 ($195-$350 per sq ft); a garage conversion runs $75,000-$165,000.
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| Average Build Cost | $130,000-$290,000 |
| Cost per Sq Ft | $195-$350 |
| Garage Conversion | $75,000-$165,000 |
| Prefab ADU (Installed) | $100,000-$235,000 |
Finance Your ADU Project
Most ADU projects are funded through HELOCs, construction loans, or cash-out refinancing. Compare rates from top lenders.
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Rental Income Potential [4][5]
A 2-bedroom ADU in Anaheim rents for around $2,000-$2,800/mo, an estimated 7-10% annual return.
| Avg Rent (1 Bedroom) | $1,700-$2,300/mo |
| Avg Rent (2 Bedroom) | $2,000-$2,800/mo |
| Short-Term Rental | Strict STR regulations; limited to certain areas |
| Est. Annual ROI | 7-10% annual return |
Explore Prefab ADU Options
Prefab ADUs can save 20-40% vs. traditional construction and cut build time in half.
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Recent Law Changes
What's Changed Recently
- Data accuracy correction (2026-06-28): updated per official city/state sources following a regulatory audit.
- SB 543 (Jan 2026): ADU applications deemed approved if city fails to act within 60 days
- AB 1154 (effective Jan 1, 2026): A locality may require owner-occupancy for a JADU only if it shares a bathroom with the primary dwelling; JADUs with their own bathroom are exempt (matching detached ADU rules)
- SB 1211 in effect (2025-2026): Up to 8 detached ADUs allowed on multifamily lots statewide
- AB 1033 opt-in expanding (2026): More cities allowing separate sale of ADUs as condos
Tips for Building an ADU in Anaheim
- Proximity to Disneyland creates strong short-term rental demand if permitted
- Long-term rental demand is strong due to limited affordable housing
- Tourism areas may have specific design requirements
- Consider ADA-accessible designs to expand your rental market
ADU Builders in Anaheim
Looking for an ADU builder in Anaheim? ADU projects need a contractor experienced with local zoning, the permit process, and utility connections — not every general contractor has built one. We match Anaheim homeowners with experienced local ADU contractors who provide free, no-obligation quotes. Getting at least three bids typically saves 20-40% on the same scope.
Sources & References
All data on this page is sourced from official government records and verified market data. View our full methodology.
- Anaheim Municipal Code 18.38.015 — Accessory Dwelling Units and Junior ADUs Municipal Code — Accessed 2026-06-28
- Angi — ADU Construction Cost Data Market Data — Accessed 2026-02-24
- Angi — Local ADU Contractor Costs Market Data — Accessed 2026-02-24
- Zillow Rental Manager — Market Rent Data Market Data — Accessed 2026-02-24
- HUD Fair Market Rents Government Data — Accessed 2026-02-24
- California ADU Handbook — HCD Government Data — Accessed 2026-02-24
Frequently Asked Questions
Can I build an ADU in Anaheim?
Yes. ADUs are allowed in Our zone list is incomplete — it omits the three RH hillside zones and RM-3.5. The code permits ADUs and JADUs in all areas zoned to allow single-family or multiple-family residential use. Single-family zones: RH-1, RH-2, RH-3, RS-1, RS-2, RS-3, RS-4. Multiple-family zones: RM-1, RM-2, RM-3, RM-3.5, RM-4. Two absolute local exclusions we do not mention at all: no ADU or JADU on any parcel that has obtained a permit for an SB 9 Two-Unit Development or Urban Lot Split, and none in any area the City Council designates by resolution as having insufficient sewer infrastructure. in Anaheim. The maximum size for a detached ADU is 1,200 sq ft headline cap, but expressly 'subject to 18.04.080.020', which caps the cumulative floor area of ALL enclosed detached accessory structures at the underlying zone's minimum livable floor area (1,700 sq ft in RH-1, RH-2, RH-3 and RS-1; 1,225 sq ft in RS-2, RS-3, RS-4) and further provides it 'shall not exceed the square footage of the main dwelling'. So on a modest primary home the detached ADU is limited to the size of that home. State law still guarantees at least 800 sq ft regardless.. Owner-occupancy: Our JADU half is incomplete and currently misleads. No owner-occupancy requirement for an ADU. For a JADU, owner-occupancy applies ONLY where the JADU SHARES sanitation facilities with the primary residence — a JADU with its own bathroom carries no owner-occupancy requirement at all. Where it does apply: a covenant must be recorded with the Orange County Recorder before the building permit issues, the unit not occupied by the owner may only be rented for 30 or more consecutive days, and the requirement is waived where the owner is a governmental agency, land trust or housing organization. Anaheim tracks Gov. Code 66333(b)/AB 1154 exactly.
How much does an ADU cost in Anaheim?
ADU construction in Anaheim typically costs $130,000-$290,000. Garage conversions run $75,000-$165,000, and prefab ADUs cost $100,000-$235,000.
How much can I rent an ADU for in Anaheim?
Average ADU rents in Anaheim are $1,700-$2,300/mo for a 1-bedroom and $2,000-$2,800/mo for a 2-bedroom unit.
Do I need parking for an ADU in Anaheim?
Substantively right but the CITATION IS WRONG — this comes from AMC 18.42.030.070, not 18.38.015 (which merely cross-references it). Studio ADU: 0 spaces. ADU with one or more bedrooms: 1 space. JADU: 0, always. Parking is waived entirely where the ADU is within a half-mile walking distance of a transit stop, in an architecturally and historically significant historic district, part of the existing/proposed primary residence or an existing accessory structure, where on-street parking permits are required but not offered to the occupant, where a car-share station is within one block, or where a garage/carport is demolished or converted for the ADU. No replacement parking is ever required for a demolished or converted garage. Any required space must be exclusive to the ADU if shared in the main garage.. Check with Anaheim planning department for the latest California ADU parking rules, as many states have relaxed requirements in recent years.
How long does it take to get an ADU permit in Anaheim?
The permit review timeline in Anaheim is '60 days' alone is incomplete. The code sets a two-stage clock: the city must determine whether the application is complete within 15 BUSINESS days, and every resubmittal is subject to the same 15-business-day review period; once deemed complete, the permit must be approved or denied within 60 days. Where the ADU application is filed together with an application for a new primary dwelling, the city may defer the ADU decision until the primary is decided. Separately, via ADU Express the city advertises the review completed in 1-3 days with the building permit issued in as little as one day — but be honest that the city also says the eligibility screening beforehand 'can take a few weeks to complete'.. Fees range from $3,500-$12,000.
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