Yes: Huntington Beach accepts and ministerially approves ADU and JADU applications under state ADU law (Gov. Code 66310-66342); the city's own planning page says its local ordinance, HBZSO Section 230.10, is no longer in effect, so the state defaults apply: a detached ADU up to 1,200 sq ft, an attached ADU up to 50% of the house, 16 ft tall (18 ft near major transit or on a multifamily lot), 4-ft side and rear setbacks, and an 800 sq ft unit that can never be refused. The City Council voted on February 21, 2023 to stop processing ADU and SB 9 applications; HCD served a Notice of Potential Violation the same day, the state sued on March 9, 2023, and the city has accepted ADU applications since the March 7, 2023 council meeting. Roughly the coastal third of the city is in the Coastal Zone, where an ADU also needs a Coastal Development Permit heard by the Zoning Administrator ($5,756 on a single-family lot), and in September 2026 the Planning Commission denied one such permit on appeal. A free pre-approved 490 sq ft one-bedroom plan is available in three styles, the Building Division targets 20 business days for a first plan check, and units of 750 sq ft or less pay no development impact fees.
Zoning & Size Requirements [1][2][3][4][5][6]
Yes — Huntington Beach allows ADUs. A detached ADU can typically be up to 1,200 sq ft under current California and Huntington Beach zoning rules.
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| Allowed Zones | Any lot zoned for single-family or multifamily residential use under state law (Gov. Code 66314, 66323); the city says HBZSO 230.10, its former ADU section, no longer applies and reviews all ADUs and JADUs ministerially. Coastal Zone parcels (CZ overlay: Sunset Beach, harbor, downtown, beachfront) also need a Coastal Development Permit from the Zoning Administrator unless Planning issues a categorical-exclusion letter. The Dec 2025 court order affects only draft-housing-element sites |
| Max Size (Detached) | 1,200 sq ft under state law (Gov. Code 66314(b)(5)); the city cannot apply a lot-coverage, floor-area or open-space rule that would keep out an 800 sq ft detached ADU with 4-ft side and rear setbacks (Gov. Code 66321(b)(2)). The city's free pre-approved plan is a 490 sq ft one-bedroom, one-bath detached unit with an optional 53 sq ft porch |
| Max Size (Attached) | 50% of the existing primary dwelling's floor area or 1,200 sq ft, whichever is less (Gov. Code 66314(b)(4)-(5)), but never less than 800 sq ft for a unit of any bedroom count (Gov. Code 66321(b)(2)); the state minimum floors of 850 sq ft (studio or one bedroom) and 1,000 sq ft (two or more bedrooms) apply if the city adopts a size cap |
| Max Size (JADU) | 500 sq ft maximum, built within the walls of the existing or proposed single-family house, including an attached garage (Gov. Code 66333); needs an efficiency kitchen and its own entrance and may share a bathroom with the house |
| Max Height | Detached ADU: 16 ft; 18 ft if within 1/2 mile walking distance of a major transit stop or on a lot with an existing or proposed multifamily, multistory dwelling, plus 2 ft where the roof pitch matches the main house (Gov. Code 66321(b)(4)). Attached ADU: 25 ft or the underlying zone's height limit, whichever is lower. In the Coastal Zone the city measures height from the highest adjacent street level (Downtown Specific Plan 5.2.7 was applied to a 2026 two-story, 18-ft ADU project) |
| Max Units | Single-family lot: one ADU plus one JADU, and up to one additional 800 sq ft detached ADU where the lot already has a JADU inside the house (Gov. Code 66323(a)(1)-(2)). Multifamily lot: conversion ADUs inside non-livable space up to 25% of existing units (at least one), plus up to two detached ADUs on a lot with a proposed multifamily building or up to eight (not exceeding the existing unit count) on a lot with an existing one (Gov. Code 66323(a)(3)-(4), SB 1211) |
Setback Requirements [1][2][3][4][5][6]
Huntington Beach 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 | No more than 4 ft for a new detached or attached ADU (Gov. Code 66321(b)(3), 66323(a)(1)); no setback for converting an existing legal structure or rebuilding one in the same footprint and dimensions (Gov. Code 66314(b)(7)). Coastal-zone projects may be held to specific-plan setbacks where they exceed 4 ft (a 2026 downtown project used 5 ft interior and 10 ft street-side) |
| Side Setback | No more than 4 ft (Gov. Code 66321(b)(3)); none for conversions of legal existing space or same-footprint rebuilds. On a multifamily lot whose existing building sits closer than 4 ft to a line, the city cannot require that building to be modified for the ADU (Gov. Code 66323(a)(4)(B)) |
| Front Setback | The underlying zone's front setback applies, but it cannot be used to block an 800 sq ft ADU with 4-ft side and rear setbacks (Gov. Code 66321(b)(2)); the city has no published ADU-specific front-setback rule since HBZSO 230.10 stopped applying. Ask Planning at (714) 536-5271 which zone or specific-plan setback governs your lot |
| Parking Required | No more than 1 space per ADU or bedroom, and none within 1/2 mile walking distance of public transit, in a historic district, for a conversion of existing space, for a studio, or where street-parking permits are not offered to the ADU (Gov. Code 66314(b), 66323); no replacement parking for a converted garage or carport. Coastal Zone caution: on September 8, 2026 the Planning Commission denied a downtown two-ADU coastal permit on a parking appeal although staff found the transit exemption applied |
| Owner Occupancy | Not required for an ADU (Gov. Code 66315; no owner-occupancy standard may be imposed). A JADU requires the owner to live in the house or the JADU only when the JADU shares a bathroom with the house (Gov. Code 66333(b), AB 1154, effective January 1, 2026) |
| Min Lot Size | None; state law bars minimum-lot-size standards for ADUs (Gov. Code 66314(b)(1), 66321(a)) and the city applies no local ADU ordinance |
Permit Process & Fees [7][8][9][10][11]
An ADU permit in Huntington Beach goes through a ministerial, by-right review. Typical timeline: Building Division targets 20 business days for a first plan check (10 expedited at twice the fee), 10 for a second and 5 after that; state law requires a decision within 60 days of a complete application or the ADU is deemed approved (Gov. Code 66317, SB 543). A coastal permit adds months. Fees range from $40 processing plus an inspection fee set by city valuation (about $1,664 at $150,000), 61% building and 46% planning plan review, trade permits, and a 6% automation fee (Res. 2023-21); roughly $4,000-$6,000 for a 490-800 sq ft ADU. A Coastal Development Permit adds $5,756 (single-family lot).
| Approval Process | Ministerial building permit through the Permit Center, submitted digitally on the HB ACA portal (714-536-5271, permitcenter@surfcity-hb.org); plans are routed to Building, Planning, Fire and Public Works, and an Address Assignment application is required for each ADU before permit approval. Coastal Zone parcels first need a Coastal Development Permit from the Zoning Administrator (a noticed public hearing, appealable to the Planning Commission) or a categorical-exclusion letter; check your parcel's CZ overlay on the Zoning Viewer before designing |
| Review Timeline | Building Division targets 20 business days for a first plan check (10 expedited at twice the fee), 10 for a second and 5 after that; state law requires a decision within 60 days of a complete application or the ADU is deemed approved (Gov. Code 66317, SB 543). A coastal permit adds months |
| Permit Fees | $40 processing plus an inspection fee set by city valuation (about $1,664 at $150,000), 61% building and 46% planning plan review, trade permits, and a 6% automation fee (Res. 2023-21); roughly $4,000-$6,000 for a 490-800 sq ft ADU. A Coastal Development Permit adds $5,756 (single-family lot) |
| Impact Fees | None for an ADU of 750 sq ft or less; larger units pay in proportion to the primary dwelling (Gov. Code 66311.5). The city's schedule lists an Accessory Dwelling Unit rate for units that do pay: park land $3,130, library $213, police $183.50 and fire $86 per unit (effective 10/1/2016, plus 6% automation), a traffic fee set by Public Works (714-536-5431), and a school fee of $4.79 per sq ft on residential additions of 500 sq ft or more |
| Plan Check | Digital submittal only (since February 1, 2023) through the HB ACA portal; over-the-counter review by appointment Monday and Wednesday mornings for very minor plans only. Plan review fees are due at submittal; more than two reviews on a project valued at $100,000 or less are billed at $162 per hour |
| Pre-Approved Plans | Yes: one free pre-approved plan under AB 1332 (Gov. Code 65852.27), a one-story 490 sq ft detached one-bedroom, one-bath ADU offered in three exteriors (California Ranch, Bungalow, Spanish Colonial), with an optional 53 sq ft porch and optional solar. The plan cannot be modified; sprinklers are required only if the main house has them, and the owner must check for an oil well on or within 100 ft of the parcel (methane barrier if yes) |
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Construction Costs [12][13][14][15][16][17]
Building an ADU in Huntington Beach typically costs $185,000-$420,000 ($300-$525 per sq ft); a garage conversion runs $90,000-$185,000.
See what this means for your lot — ask Huntington Beach ADU builders for a quote →
| Average Build Cost | $185,000-$420,000 |
| Cost per Sq Ft | $300-$525 |
| Garage Conversion | $90,000-$185,000 |
| Prefab ADU (Installed) | $120,000-$300,000 |
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Rental Income Potential [18][19][20]
A 2-bedroom ADU in Huntington Beach rents for around $3,050-$3,250/mo, an estimated 7-12% gross annual yield.
| Avg Rent (1 Bedroom) | $2,600-$2,800/mo |
| Avg Rent (2 Bedroom) | $3,050-$3,250/mo |
| Short-Term Rental | No for a new ADU. HB Municipal Code Chapter 5.120 (Ord. |
| Est. Annual ROI | 7-12% gross annual yield |
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Recent Law Changes
What's Changed Recently
- Sep 8, 2026: Planning Commission denied Coastal Development Permit 26-006 for two detached ADUs (420 and 480 sq ft, 18 ft) on a downtown triplex lot at 205 Pecan Ave after Councilmember Pat Burns appealed the Zoning Administrator's approval on parking grounds; staff had found the units compliant with Gov. Code 66323 and exempt from parking (0.1 mile from transit)
- Jul 1, 2026: San Diego Superior Court granted the state's anti-SLAPP motion and struck the city's cross-complaint in the housing-element lawsuit; May 15, 2026: the same court imposed $160,000 in penalties plus $50,000 per month from June 2026 until the city adopts a compliant housing element
- Dec 19, 2025: Court ordered the city to adopt a housing element within 120 days and suspended its permitting, rezoning and subdivision authority for the sites in its draft housing element (not ordinary residential lots); the California Supreme Court had denied the city's petition the week before
- Jul 1, 2025: Building permit fee schedule and FY 2025-26 Master Fee Schedule took effect (Zoning Administrator Coastal Development Permit $5,756 single-family, $7,465 all others; 6% automation fee); a FY 2026-27 schedule effective July 1, 2026 is posted but could not be read
- Jan 1, 2026: SB 543 (60-day deemed approval, appeal timelines) and AB 1154 (JADU owner-occupancy only with a shared bathroom) took effect statewide; 2025 California Building Standards Code applies to plans filed from that date
- Feb 21, 2023: Council voted to direct the City Manager to cease processing SB 9, SB 10 and state-law ADU applications pending litigation; HCD issued a Notice of Potential Violation the same day and the state sued on March 9, 2023. Motions to formally resume processing failed on March 7 and March 21, 2023, but the city's ADU page states that per council direction at the March 7, 2023 meeting staff continue to accept ADU applications
Tips for Building an ADU in Huntington Beach
- Check the Coastal Zone first: open the city's Zoning Viewer and look for the CZ overlay. Inside it, budget $5,756 (single-family lot) or $7,465 (other lots) and several extra months for a Zoning Administrator Coastal Development Permit, and know that an approval can be appealed to the Planning Commission, as happened to a downtown two-ADU project denied on September 8, 2026
- Outside the Coastal Zone, design to the state defaults: 800 sq ft, 16 ft and 4-ft side and rear setbacks cannot be refused, and a garage conversion needs no replacement parking
- Use the free 490 sq ft pre-approved plan (Ranch, Bungalow or Spanish Colonial) to skip design fees, but it cannot be altered; at 490 sq ft it stays under the 500 sq ft school-fee threshold and the 750 sq ft impact-fee threshold
- Cost basis: Orange County guides dated 2025-2026 (Keystone 2026 page: $315-$525 per sq ft, detached 800-1,200 sq ft $263K-$473K; YBL Aug 6, 2026: $300-$450 per sq ft, small detached $150K-$250K; Dynamic Quality Builders Feb 5, 2026: detached $250K-$400K, garage $120K-$185K; GatherADU May 7, 2025: garage $90K-$135K; ADU West Coast Jul 1, 2026: garage $150K-$200K; Autonomous Feb 26, 2026: prefab all-in $120K-$300K). Rents are HUD FY2027 Small Area Fair Market Rents for ZIPs 92646-92649 (effective October 1, 2026)
- Every permit fee carries a 6% automation surcharge (Resolution 2023-21) and card payments a 3% service fee; ask the Permit Center for a written estimate at permitcenter@surfcity-hb.org before you commit to a design
- Plan for long-term tenants: an ADU built now cannot get a short-term rental permit (only units legally established before February 19, 2021 qualify under Chapter 5.120), and state law requires rentals longer than 30 days
- Huntington Beach sits on old oil fields: the pre-approved plan and the Fire Department require a check for any oil well on or within 100 ft of the parcel, and a methane barrier if one exists
- If staff cite HBZSO 230.10 standards, point to the city's own ADU page, which says that section is no longer in effect and that all ADUs and JADUs are reviewed ministerially under state law
- Cost basis (2026-09-20 re-verification): short term allowed: No for a new ADU. HB Municipal Code Chapter 5.120 (Ord. 4224, effective February 19, 2021) lets an ADU or JADU hold a short-term rental permit only if the unit was legally established before that date; hosted STRs are otherwise limited to the main home, and un-hosted STRs exist only in Sunset Beach under permits issued by March 1, 2022. State law also requires ADU rentals to run longer than 30 days (Gov. Code 66323(e))
ADU Builders in Huntington Beach
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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 (ADUs) - City of Huntington Beach Planning Division (HBZSO 230.10 no longer in effect; ministerial review; Coastal Zone CDP; March 7, 2023 direction) city_website — Accessed 2026-09-20
- HCD Notice of Potential Violation - City's Intent to Cease Processing ADU Permits (Feb 21, 2023; via Wayback) state_statute — Accessed 2026-09-20
- Legistar File 23-172 (Feb 21, 2023 vote to cease processing SB 9/SB 10/ADU applications), 23-227 (Mar 7, 2023 motion to resume, failed) and 23-224 (Mar 21, 2023 motion, failed) - Huntington Beach City Council city_website — Accessed 2026-09-20
- Legistar File 26-708 - Appeal of Zoning Administrator approval of Coastal Development Permit 26-006 (205 Pecan ADUs), Planning Commission denial Sep 8, 2026, with staff findings and appeal letter city_website — Accessed 2026-09-20
- Gov. Code 66314, 66315, 66317, 66321, 66323, 66333 (state ADU law as amended by SB 543 and AB 1154, effective Jan 1, 2026) state_statute — Accessed 2026-09-20
- Attorney General press releases on People v. City of Huntington Beach (Dec 19, 2025 order; May 15, 2026 penalties; Jul 1, 2026 anti-SLAPP ruling) state_statute — Accessed 2026-09-20
- Huntington Beach Pre-Approved ADU Program Brochure (490 sq ft plan, three styles; via Wayback) city_website — Accessed 2026-09-20
- Permit Center - Plan Review turnaround times and department approvals city_website — Accessed 2026-09-20
- Building Permit Fees schedule effective 07/01/2025 (valuation table, plan review percentages, DIF table with ADU column, school fee; via Wayback) city_website — Accessed 2026-09-20
- FY 2025-26 Master Fee & Charges Schedule - Community Development (PL-28/29 ZA Coastal Development Permit, PL-49 address assignment, PL-54, PL-57, PL-95; via Wayback) city_website — Accessed 2026-09-20
- Master Fee & Charges Schedule page (FY 2026-27 schedule effective 7/1/26 listed) city_website — Accessed 2026-09-20
- ADU Construction Cost in Orange County (2026) - Keystone industry — Accessed 2026-09-20
- How Much Does an ADU Cost in Orange County? 2026 Guide (Aug 6, 2026) - YBL Design and Build industry — Accessed 2026-09-20
- ADU Cost Southern California 2026 by County (updated Feb 5, 2026) - Dynamic Quality Builders industry — Accessed 2026-09-20
- Garage Conversion ADU Cost in Orange County (May 7, 2025) - GatherADU industry — Accessed 2026-09-20
- Garage Conversion ADU in Orange County: What It Costs in 2026 (Jul 1, 2026) - ADU West Coast industry — Accessed 2026-09-20
- Prefab ADUs in Southern California: Complete Guide for 2026 (Feb 26, 2026) - Autonomous industry — Accessed 2026-09-20
- HUD FY 2027 Small Area Fair Market Rents - ZIPs 92646, 92647, 92648, 92649 (published Aug 2026, effective Oct 1, 2026) Government Data — Accessed 2026-09-20
- Short-Term Rentals - City of Huntington Beach Permit Center (Chapter 5.120, Ord. 4224; ADU eligibility only if legally established before Feb 19, 2021) city_website — Accessed 2026-09-20
- HB Municipal Code Chapter 5.120 - Short-Term Rentals Municipal Code — Accessed 2026-09-20
Frequently Asked Questions
Can I build an ADU in Huntington Beach?
Yes. ADUs are allowed in Any lot zoned for single-family or multifamily residential use under state law (Gov. Code 66314, 66323); the city says HBZSO 230.10, its former ADU section, no longer applies and reviews all ADUs and JADUs ministerially. Coastal Zone parcels (CZ overlay: Sunset Beach, harbor, downtown, beachfront) also need a Coastal Development Permit from the Zoning Administrator unless Planning issues a categorical-exclusion letter. The Dec 2025 court order affects only draft-housing-element sites in Huntington Beach. The maximum size for a detached ADU is 1,200 sq ft under state law (Gov. Code 66314(b)(5)); the city cannot apply a lot-coverage, floor-area or open-space rule that would keep out an 800 sq ft detached ADU with 4-ft side and rear setbacks (Gov. Code 66321(b)(2)). The city's free pre-approved plan is a 490 sq ft one-bedroom, one-bath detached unit with an optional 53 sq ft porch. Owner-occupancy is not required, so you can rent out the ADU.
How much does an ADU cost in Huntington Beach?
ADU construction in Huntington Beach typically costs $185,000-$420,000. Garage conversions run $90,000-$185,000, and prefab ADUs cost $120,000-$300,000.
How much can I rent an ADU for in Huntington Beach?
Average ADU rents in Huntington Beach are $2,600-$2,800/mo for a 1-bedroom and $3,050-$3,250/mo for a 2-bedroom unit.
Do I need parking for an ADU in Huntington Beach?
No more than 1 space per ADU or bedroom, and none within 1/2 mile walking distance of public transit, in a historic district, for a conversion of existing space, for a studio, or where street-parking permits are not offered to the ADU (Gov. Code 66314(b), 66323); no replacement parking for a converted garage or carport. Coastal Zone caution: on September 8, 2026 the Planning Commission denied a downtown two-ADU coastal permit on a parking appeal although staff found the transit exemption applied. Check with Huntington Beach 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 Huntington Beach?
The permit review timeline in Huntington Beach is Building Division targets 20 business days for a first plan check (10 expedited at twice the fee), 10 for a second and 5 after that; state law requires a decision within 60 days of a complete application or the ADU is deemed approved (Gov. Code 66317, SB 543). A coastal permit adds months. Fees range from $40 processing plus an inspection fee set by city valuation (about $1,664 at $150,000), 61% building and 46% planning plan review, trade permits, and a 6% automation fee (Res. 2023-21); roughly $4,000-$6,000 for a 490-800 sq ft ADU. A Coastal Development Permit adds $5,756 (single-family lot).
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