Yes. Irvine approves ADUs and JADUs ministerially under state law: Zoning Code Chapter 3-26, rewritten by Ordinance No. 25-22 on September 9, 2025, now applies Gov. Code 66310-66342 with no added local standards, so a detached ADU can be up to 1,200 sq ft and 16-18 ft tall with 4-ft side and rear setbacks on any single-family or multifamily lot, and an 800 sq ft unit cannot be blocked by lot size or coverage. The city requires a signed ADU Verification Form before an IrvineReady! submittal; planning review is billed at $217.64 an hour against a $1,500 deposit, building plan check runs per square foot, and a decision is due within 60 days of a complete application. Units of 750 sq ft or less pay no impact fees, and the city's school-fee form also exempts ADUs of 749 sq ft or less. Most Irvine homes sit in HOA communities: CC&Rs cannot ban an ADU (Civil Code 4751), but HOA design review runs alongside the city's. Short-term rentals are banned in every residential zone.
Zoning & Size Requirements [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]
Yes — Irvine allows ADUs. A detached ADU can typically be up to 1,200 sq ft under current California and Irvine zoning rules.
See what this means for your lot — ask Irvine ADU builders for a quote →
| Allowed Zones | Any lot zoned for single-family or multifamily residential use with an existing or proposed home. Zoning Code Ch. 3-26 (Ord. 25-22, adopted Sept 9, 2025) applies Gov. Code 66310 et seq. with no added local standards; the land-use matrix lists ADUs in the 2.1-2.5 residential and 3.1 multi-use districts. Exceptions: SB 9 urban-lot-split duplex parcels (Sec. 3-42-5) and the ARDA Transfer Site in the 8.1 zone. HOA CC&Rs cannot ban or unreasonably restrict an ADU (Civil Code 4751) |
| Max Size (Detached) | 1,200 sq ft (Gov. Code 66314(d)(5)). An 800 sq ft unit with 4-ft side and rear setbacks must be allowed regardless of lot coverage, floor-area ratio or lot size (66321(b)(3)); the city's checklist (Form 67-01, rev. 1/25) states the same 1,200 and 800 sq ft figures |
| Max Size (Attached) | 50% of the existing home's floor area, up to 1,200 sq ft (66314(d)(4)); a cap below 850 sq ft, or 1,000 sq ft for two or more bedrooms, cannot be imposed (66321(b)(2)) |
| Max Size (JADU) | 500 sq ft of interior livable space inside the single-family home, including an attached garage (66313(d), 66333(d)); the city checklist allows a 150 sq ft addition for entry and exit |
| Max Height | 16 ft for a detached ADU; 18 ft within 1/2 mile walking distance of a major transit stop or high-quality transit corridor, or on a lot with a multistory multifamily building, plus 2 ft to match the main roof pitch; attached ADUs up to 25 ft or the zone's limit, whichever is lower (66321(b)(4)) |
| Max Units | Single-family lot: 1 ADU plus 1 JADU. Multifamily lot: conversion ADUs in non-livable space (at least 1, up to 25% of existing units) plus up to 8 detached ADUs on a lot with an existing building (not more than the existing unit count) or 2 with a proposed building (66323(a)) |
Setback Requirements [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]
Irvine 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 ft (66314(d)(7)); none for a conversion of existing space or a rebuild in the same footprint |
| Side Setback | 4 ft (66314(d)(7)); none for conversions. The city checklist also asks for 6 ft between buildings and 2 ft from the property line for mechanical equipment |
| Front Setback | The underlying zone's front setback, but it cannot prevent an 800 sq ft ADU (66321(b)(3)) |
| Parking Required | At most 1 space per ADU or per bedroom (Zoning Code Sec. 4-3-4 lists 1 space, none for a studio). No space can be required within 1/2 mile walking distance of public transit, for a conversion, in a historic district, or where street permits are not offered to the ADU (66322); no replacement parking when a garage is converted or demolished (66314(d)(11)) |
| Owner Occupancy | Not required for an ADU (66315). For a JADU, required only if it shares a bathroom with the main house (66333(b), AB 1154, effective Jan 1, 2026); JADUs also need a recorded deed restriction (66333(c)). The city's ADU submittal list still asks every applicant for a notarized, recorded covenant; ask Planning what it covers |
| Min Lot Size | None; a minimum lot size cannot be imposed (66314(b)(1)). The 5,000 sq ft rule in the former Ord. 18-05 chapter was repealed Sept 9, 2025 |
Permit Process & Fees [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31]
An ADU permit in Irvine goes through a ministerial, by-right review. Typical timeline: Completeness check in about 2 business days, then a first plan check target of 20 working days for new construction or 5 for additions and conversions (Bulletin 279); state law requires a decision within 60 days of a complete application or the ADU is deemed approved (Gov. Code 66317). Permit fees: Planning ADU review is hourly at $217.64 against a $1,500 deposit; building plan check plus inspection is $0.68 + $0.56 per sq ft for a new detached unit ($0.86 + $1.33 for additions and conversions) plus 10% automation fee (Aug 15, 2026 schedules); roughly $2,700-$3,900 all-in for a 750 sq ft ADU.
| Approval Process | Ministerial. First get the ADU Verification Form signed by Planning (planning@cityofirvine.org, 949-724-6308), then file the Residential ADU application package through the IrvineReady! portal under "For Permitting--Other": building plans, Development Standards Checklist (Form 67-01), Hold Harmless Affidavit, notarized covenant, Developer Deposit Case Set-Up, School Fee, TCA and Address forms, and a C&D waste plan. Plans route to Planning, Public Works, OCFA and C&D review; HOA approval runs separately |
| Review Timeline | Completeness check in about 2 business days, then a first plan check target of 20 working days for new construction or 5 for additions and conversions (Bulletin 279); state law requires a decision within 60 days of a complete application or the ADU is deemed approved (Gov. Code 66317) |
| Permit Fees | Planning ADU review is hourly at $217.64 against a $1,500 deposit; building plan check plus inspection is $0.68 + $0.56 per sq ft for a new detached unit ($0.86 + $1.33 for additions and conversions) plus 10% automation fee (Aug 15, 2026 schedules); roughly $2,700-$3,900 all-in for a 750 sq ft ADU |
| Impact Fees | None for an ADU of 750 sq ft or less; larger units pay in proportion to the main house (Gov. Code 66311.5; Irvine DIF ordinance Sec. 2-7-905(F)). Over 750 sq ft the Systems Development Charge (1% of valuation, Muni Code 2-9-601) and the Transportation Corridor Agencies fee ($2,864-$4,030 per multi-family-class unit, FY2027) can apply; the citywide DIF ($5.34 per sq ft) is charged only in the Irvine Business Complex. School fee: IUSD $4.79 per sq ft on the city's 2022 sheet, but the city's form exempts ADUs of 749 sq ft or less |
| Plan Check | Building plan check through IrvineReady!, charged per sq ft under Schedule II (Res. 24-41, effective Aug 15, 2026), plus $31.88 permit issuance and state SMIP/energy surcharges; valuation uses the city's ICC table ($175.92 per sq ft, R-3 Type VB, Aug 2026); OCFA reviews the residential site plan (PR160, $398) |
| Pre-Approved Plans | Program page exists (AB 1332 pre-approved-plans program) but lists no plans: "Coming soon" as of Sept 20, 2026. The city is recruiting design firms (CDAC@cityofirvine.org); any plan used still gets a site-specific review |
Get Free ADU Quotes in Irvine
Tell us about your project and we'll pass it to ADU builders serving Irvine. Free, no obligation — you choose who to work with. We don't have builders in every area yet; if nobody covers yours, we'll email you to say so.
1. Tell us your project
Takes about a minute.
Takes about a minute.
2. We match local pros
Up to 5 independent local ADU builders — never more, and we tell them nothing you don't submit here.
Up to 5 independent local ADU builders — never more, and we tell them nothing you don't submit here.
3. You choose
Compare quotes, verify license & insurance, hire (or don't). No spam either way.
Compare quotes, verify license & insurance, hire (or don't). No spam either way.
🔒 Your info is secure. We share it only with contractors quoting your project. No spam, no obligation.
Just browsing? Search ADU builders near you by ZIP code.
Construction Costs [32][33][34][35][36][37]
Building an ADU in Irvine 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 Irvine 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 |
Finance Your ADU Project
Most ADU projects are funded through HELOCs, construction loans, or cash-out refinancing. Compare rates from top lenders.
Some links on this page are affiliate links. We may earn a commission at no extra cost to you. Learn more
Rental Income Potential [38][39][40]
A 2-bedroom ADU in Irvine rents for around $3,600-$4,350/mo, an estimated 9-17% gross annual yield.
| Avg Rent (1 Bedroom) | $3,100-$3,700/mo |
| Avg Rent (2 Bedroom) | $3,600-$4,350/mo |
| Short-Term Rental | No. Zoning Code Ch. 3-25 prohibits rentals of 30 days or less in every residential zoning district and bans advertising them (Sec. 3-25-3); the city fines $1,500 per day and can prosecute a misdemeanor. |
| Est. Annual ROI | 9-17% gross annual yield |
Explore Prefab ADU Options
Prefab ADUs can save 20-40% vs. traditional construction and cut build time in half.
Some links on this page are affiliate links. We may earn a commission at no extra cost to you. Learn more
Recent Law Changes
What's Changed Recently
- Sept 9, 2025: Ordinance No. 25-22 (Zone Change 00958503-PZC; first reading Aug 12, 2025; adopted 7-0) repealed the 2018 ADU chapter (Ord. 18-05, Secs. 3-26-1 to 3-26-7) and replaced Ch. 3-26 with one section applying Gov. Code 66310 et seq.; effective 30 days after adoption per the City Charter; codified in Zoning Code Supp. 16 (Aug 2026)
- Aug 15, 2026: FY2026-27 Community Development fee schedules took effect (Council Res. 24-41, 25-78): planning ADU review $217.64 per hour against a $1,500 deposit; building plan check and inspection per sq ft; citywide DIF $5.34 per sq ft residential in the Irvine Business Complex only
- July 1, 2026: Transportation Corridor Agencies FY2027 fee rates ($2,864-$4,030 per multi-family-class unit; rising 2.2-2.7% each July 1); relevant only to ADUs over 750 sq ft
- June 24, 2025: Ordinance No. 25-15 adopted the citywide development impact fee ordinance (Muni Code 2-7-901 et seq.); Sec. 2-7-905(F) subjects ADUs to DIFs only as the Mitigation Fee Act and state law allow
- Jan 7 and Mar 27, 2025: HCD findings and technical-assistance letters found Ord. 18-05 inconsistent with state ADU law (letters not re-read this session; hcd.ca.gov blocked); the Sept 2025 repeal is the city's response
- Jan 1, 2026: SB 543 (60-day deemed approval, 15-business-day completeness check, impact-fee rule renumbered to 66311.5) and AB 1154 (JADU owner-occupancy only with a shared bathroom) took effect statewide
- Pre-Approved ADU Plans Program page (AB 1332) still shows "Coming soon" with no plans listed as of Sept 20, 2026
Tips for Building an ADU in Irvine
- Get the ADU Verification Form signed by Planning before you upload anything: the city will not accept an ADU submittal without it, and the plan-review clock does not start until the deposit and plan-check fees are paid
- Keep the unit at 750 sq ft or less: no impact fees (Gov. Code 66311.5), and Irvine's own School Fee Determination Form exempts ADUs of 749 sq ft or less from the $4.79 per sq ft IUSD fee; an 800 sq ft unit can trigger school, TCA and Systems Development charges
- Start HOA architectural review early: Civil Code 4751 voids CC&Rs that ban or unreasonably restrict an ADU, but the city's own checklist says your HOA may have its own approval process, and it runs in parallel with the city's
- The submittal list still asks for a notarized, recorded covenant; state law requires a recorded deed restriction only for a JADU (Gov. Code 66333(c)), so ask Planning what the covenant covers before signing
- Do not wait for pre-approved plans: the program page lists none yet, and a licensed designer's plans go through the same 20-working-day first plan check
- Do not plan on Airbnb: Irvine bans rentals of 30 days or less in every residential zone, with $1,500-per-day fines (Zoning Code Ch. 3-25)
- 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 Irvine ZIPs 92602-92620 (effective October 1, 2026)
- Cost basis (2026-09-20 re-verification): short term allowed: No. Zoning Code Ch. 3-25 prohibits rentals of 30 days or less in every residential zoning district and bans advertising them (Sec. 3-25-3); the city fines $1,500 per day and can prosecute a misdemeanor. State law also requires ADU rentals to run longer than 30 days (Gov. Code 66323(e))
ADU Builders in Irvine
Looking for an ADU builder in Irvine? ADU projects need a contractor experienced with local zoning, the permit process, and utility connections — not every general contractor has built one. We match Irvine 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.
- Irvine Zoning Code Chapter 3-26 - Accessory Dwelling Standards (Sec. 3-26-1, Ord. 25-22; Supp. 16, codified through Ord. 26-07) Municipal Code — Accessed 2026-09-20
- City Council Ordinance No. 25-22 - Zone Change 00958503-PZC (first reading Aug 12, 2025; adopted Sept 9, 2025) Municipal Code — Accessed 2026-09-20
- Irvine Zoning Code Sec. 4-3-4 - Automobile parking matrix (ADU note 3) Municipal Code — Accessed 2026-09-20
- Irvine Zoning Code Sec. 3-42-5 - Accessory dwelling unit ineligibility (SB 9 urban lot splits) Municipal Code — Accessed 2026-09-20
- Pre-Approved ADU Development Standards Checklist - City of Irvine Form 67-01 (rev. 01/25) city_website — Accessed 2026-09-20
- Gov. Code 66314 - ADU ordinance standards (sizes, 4-ft setbacks, parking, no replacement parking) state_statute — Accessed 2026-09-20
- Gov. Code 66321 - size floors (800/850/1,000 sq ft) and heights (16/18/25 ft), as amended by SB 543 state_statute — Accessed 2026-09-20
- Gov. Code 66322 - parking exemptions state_statute — Accessed 2026-09-20
- Gov. Code 66323 - units that must be approved ministerially (1 ADU + 1 JADU; 25% conversion; 8 detached on multifamily) state_statute — Accessed 2026-09-20
- Gov. Code 66315 - no owner-occupancy requirement for ADUs state_statute — Accessed 2026-09-20
- Gov. Code 66333 - JADU standards, owner-occupancy only with shared sanitation (AB 1154) state_statute — Accessed 2026-09-20
- Gov. Code 66313 - definitions (JADU 500 sq ft) state_statute — Accessed 2026-09-20
- Civil Code 4751 - HOA covenants that prohibit or unreasonably restrict ADUs are void state_statute — Accessed 2026-09-20
- Review of Irvine's ADU Ordinance - HCD Findings Letter (Jan 7, 2025) (hcd.ca.gov 403 on 2026-09-20; last read 2026-07-10) state_statute — Accessed 2026-07-10
- City of Irvine ADU Ordinance - HCD Technical Assistance Letter (Mar 27, 2025) (hcd.ca.gov 403 on 2026-09-20; last read 2026-07-10) state_statute — Accessed 2026-07-10
- Project: Constructing an Accessory Dwelling Unit (ADU) - City of Irvine (submittal list, IrvineReady!, 2-business-day completeness check) city_website — Accessed 2026-09-20
- Pre-Approved ADU Plans Program - City of Irvine ("Coming soon", no plans listed) city_website — Accessed 2026-09-20
- ADU Permit Application Package (updated 2025) - E-Submittal Checklist Form 66-02, School Fee Determination, TCA form city_website — Accessed 2026-09-20
- Fee Schedule - City of Irvine Building & Safety (links to Aug 15, 2026 schedules) city_website — Accessed 2026-09-20
- Schedule I: Planning and Development Engineering Fees, effective Aug 15, 2026 (CC Res. 24-41, 25-78) - Accessory Dwelling Unit $217.64/hr, $1,500 deposit city_website — Accessed 2026-09-20
- Schedule II: Building Safety and Grading Fees, effective Aug 15, 2026 (CC Res. 24-41) city_website — Accessed 2026-09-20
- Complete Community Development and Public Works Fee Schedule, effective Aug 15, 2026 (impact fees: SDC 1% of valuation, citywide DIF Focus Area 1) city_website — Accessed 2026-09-20
- Building Valuation Data, effective Aug 15, 2026 (R-3 Type VB $175.92 per sq ft) city_website — Accessed 2026-09-20
- Transportation Corridor Agencies Major Thoroughfare and Bridge Fee Program - FY2027 rates (July 1, 2026 - June 30, 2027) city_website — Accessed 2026-09-20
- School Facilities Fees Information Sheet - City of Irvine (rev. 06/22; IUSD $4.79 per sq ft; under 500 sq ft exempt) city_website — Accessed 2026-09-20
- Informational Bulletin No. 279 - Plan Review Turnaround Times (rev. 06/11/2020) city_website — Accessed 2026-09-20
- Orange County Fire Authority Planning & Development Fee Schedule FY2026-27 (PR160 residential site plan $398) city_website — Accessed 2026-09-20
- Irvine Municipal Code Sec. 2-7-905 - Imposition of development impact fees (Ord. 25-15; ADUs per Mitigation Fee Act and state law) Municipal Code — Accessed 2026-09-20
- Irvine Municipal Code Sec. 2-9-601 et seq. - Systems Development Charge Municipal Code — Accessed 2026-09-20
- Gov. Code 66311.5 - no impact fees on ADUs of 750 sq ft or less; proportional above state_statute — Accessed 2026-09-20
- Gov. Code 66317 - ministerial approval, 15-business-day completeness, 60-day decision or deemed approved (SB 543) state_statute — 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 - Irvine ZIPs 92602-92620, Santa Ana-Anaheim-Irvine HMFA (published Aug 2026, effective Oct 1, 2026) Government Data — Accessed 2026-09-20
- Short-Term Rentals - City of Irvine Code Enforcement (prohibited in all residential zones; $1,500 per day) city_website — Accessed 2026-09-20
- Irvine Zoning Code Chapter 3-25 - Short Term Rentals (Sec. 3-25-3) Municipal Code — Accessed 2026-09-20
Frequently Asked Questions
Can I build an ADU in Irvine?
Yes. ADUs are allowed in Any lot zoned for single-family or multifamily residential use with an existing or proposed home. Zoning Code Ch. 3-26 (Ord. 25-22, adopted Sept 9, 2025) applies Gov. Code 66310 et seq. with no added local standards; the land-use matrix lists ADUs in the 2.1-2.5 residential and 3.1 multi-use districts. Exceptions: SB 9 urban-lot-split duplex parcels (Sec. 3-42-5) and the ARDA Transfer Site in the 8.1 zone. HOA CC&Rs cannot ban or unreasonably restrict an ADU (Civil Code 4751) in Irvine. The maximum size for a detached ADU is 1,200 sq ft (Gov. Code 66314(d)(5)). An 800 sq ft unit with 4-ft side and rear setbacks must be allowed regardless of lot coverage, floor-area ratio or lot size (66321(b)(3)); the city's checklist (Form 67-01, rev. 1/25) states the same 1,200 and 800 sq ft figures. Owner-occupancy is not required, so you can rent out the ADU.
How much does an ADU cost in Irvine?
ADU construction in Irvine 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 Irvine?
Average ADU rents in Irvine are $3,100-$3,700/mo for a 1-bedroom and $3,600-$4,350/mo for a 2-bedroom unit.
Do I need parking for an ADU in Irvine?
At most 1 space per ADU or per bedroom (Zoning Code Sec. 4-3-4 lists 1 space, none for a studio). No space can be required within 1/2 mile walking distance of public transit, for a conversion, in a historic district, or where street permits are not offered to the ADU (66322); no replacement parking when a garage is converted or demolished (66314(d)(11)). Check with Irvine 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 Irvine?
The permit review timeline in Irvine is Completeness check in about 2 business days, then a first plan check target of 20 working days for new construction or 5 for additions and conversions (Bulletin 279); state law requires a decision within 60 days of a complete application or the ADU is deemed approved (Gov. Code 66317). Permit fees: Planning ADU review is hourly at $217.64 against a $1,500 deposit; building plan check plus inspection is $0.68 + $0.56 per sq ft for a new detached unit ($0.86 + $1.33 for additions and conversions) plus 10% automation fee (Aug 15, 2026 schedules); roughly $2,700-$3,900 all-in for a 750 sq ft ADU.
Ready to Build in Irvine?
Get free, no-obligation quotes from top-rated ADU contractors in Irvine.
Get Free Quotes →Build ADUs in Irvine?
Homeowners read this page while planning, then ask us to connect them with a local builder. We pass those requests to builders who cover Irvine — a flat fee only on the leads you accept, no subscription, and you contract directly with the homeowner.
See who's waiting in California →