Irvine, CA - ADU Regulations

Rules and regulations for building an ADU.

ADU info for

Irvine

  • ADU allowed?
    YES
  • Number of ADUs allowed?
    1 ADU and 1 JADU
  • Max ADU Size
    1,200 SQFT
  • Eligibility
    most single-family and multi-family zoned properties
  • Setbacks
    minimum 4-foot setback from the side and rear property lines
  • Parking Requirements
    limited requirements, especially if the property is near public transit
  • ADU allowed?
    YES
  • Number of ADUs allowed?
    1 ADU
  • Max ADU Size
    750 SQFT
  • Eligibility
    R-5, R-4, and R-4A-zoned lots
  • Setbacks
    minimum 7-foot setback from the side and 15-foot rear property lines
  • Parking Requirements
    limited requirements, especially if the property is near public transit
  • ADU allowed?
    YES
  • Number of ADUs allowed?
    2 ADU
  • Max ADU Size
    1,000 SQFT (typically)
  • Eligibility
    Most residential zones
  • Owner Occupancy
    not required*
  • ADU allowed?
    YES
  • Number of ADUs allowed?
    1 ADU
  • Max ADU Size
    800-900 SQFT (typically)
  • Eligibility
    Varies but typically cities with population over 2,500; Counties over 15,000
  • Owner Occupancy
    Not required for most cases
  • Key Note
    Urban Growth Boundaries (UGBs) affect development location
  • ADU allowed?
    YES
  • Number of ADUs allowed?
    1 ADU
  • Max ADU Size
    Read details below.
  • Eligibility
    Read details below.
  • Setbacks
    Read details below.
  • Parking Requirements
    limited requirements, especially if the property is near public transit

Understand ADU zoning rules for

Irvine

With Gather, designing your ideal ADU is a breeze. We manage all the planning and permitting paperwork, ensuring you enjoy a seamless experience and complete peace of mind.

Talk to a zoning expert
Schedule a free 30-minute call or call us now (323) 591-3717

Different types of ADUs allowed in

Irvine

Though backyard homes are typically the most familiar, ADU structures come in various types. The illustration below shows the four primary types of ADU structures.

ADUs can be built using a variety of construction methods, including pre-fabricated, modular, shed, container, panelized (in pieces), and stick-built. Each construction method has its own advantages and disadvantages in terms of cost, time, and customization.

detached adu
Detached ADU
garage conversion adu
Garage Conversion ADU
addition / attached adu
Addition / Attached ADU
detached adu
Detached ADU
garage conversion adu
Garage Conversion ADU
addition / attached adu
Addition / Attached ADU
detached adu
Detached ADU
garage conversion adu
Garage Conversion ADU
addition / attached adu
Addition / Attached ADU
detached adu
Detached ADU
garage conversion adu
Garage Conversion ADU
addition / attached adu
Addition / Attached ADU

ADU regulations for

Irvine

In a proactive effort to combat the ongoing housing crisis, the State of California has adopted specific regulations to promote the construction and utilization of Accessory Dwelling Units (ADUs). Here's an expanded and comprehensive breakdown of the key points:

1. Purpose and Prominence: California recognizes the potential of ADUs in providing affordable housing options. Given the state's dense urban centers and escalating property prices, ADUs present a viable solution to address the growing demand for residential spaces.

2. Eligibility for Establishment: Both single-family homes and multifamily properties can host an ADU.

3. Size Considerations: For detached ADUs, the maximum allowable size is up to 1,200 square feet.
The actual size of an ADU might vary depending on specific factors such as the total lot area and the size of the primary dwelling on the property.

4. Parking Norms: The state mandates limited parking requirements for ADUs.
If an ADU is situated near public transit, these parking stipulations may be even less stringent, facilitating easy construction and usage.

5. Owner-Occupancy: Historically, some jurisdictions required the property owner to live in either the primary home or the ADU. However, for ADUs permitted between 2020 and 2025, the state does not enforce such owner-occupancy requirements, allowing for greater flexibility in usage.

6. Setback Rules: For detached ADUs, there's a minimum setback requirement of 4 feet from both the rear and side yard boundaries.

7. Approval Process: Cities across the state are obligated to approve compliant ADU applications within a span of 60 days. This streamlined process ensures quick turnarounds and encourages homeowners to consider ADU development.

8. Fee Structure: To further incentivize ADU establishment, the state has reduced or completely waived fees for ADUs that are less than 750 square feet. This can translate to significant savings for property owners.

9. Rental Conditions: If an ADU meets the stipulated requirements laid out by the city, it must be available for rental. This regulation ensures that ADUs actively contribute to alleviating housing shortages.

10. Local Jurisdictional Variances: While the above guidelines provide a general framework, it's crucial to note that local jurisdictions might have their unique sets of regulations and requirements. Property owners should consult their respective city or county planning departments to get precise and localized information.

In conclusion, as California grapples with housing challenges, ADUs offer a promising avenue to augment living spaces without the need for expansive new developments. These guidelines, though comprehensive, serve as a starting point, and it's always recommended to liaise with local experts for tailored advice.

State laws (RCW 36.70A.680 and 36.70A.681) mandate that all local governments under the Growth Management Act (GMA), irrespective of size and including both cities and counties within unincorporated urban growth areas, update their regulations to align with specific criteria within six months following their scheduled update. The key directives include:

  1. ADUs per Lot: Urban areas within the GMA must allow at least two ADUs on any lot that qualifies by size, in addition to the main residence. These ADUs can be attached, detached, or a mix, and converting structures like garages into ADUs must be permitted.
  2. Size Requirements: ADUs cannot be restricted to under 1,000 square feet.
  3. Design and Location Standards: Restrictions on setbacks, lot coverage, tree preservation, or entrance placements cannot be stricter than those for the main home.
  4. Street Upgrades: ADUs cannot be subjected to demands for street improvements as a permit condition.
  5. Owner Occupancy: Requirements for the homeowner to live on-site are prohibited for both the main and accessory units.
  6. Condominium Sales: It’s not allowed to block the sale of a condominium developed as an ADU on the basis that it’s an ADU.
  7. Design Review: ADUs cannot face stricter aesthetic or design criteria than the primary residence.
  8. Parking: Parking requirements are limited, with specific conditions for smaller lots and exemptions for ADUs near major transit hubs.
  9. Impact Fees: Charges for ADUs are capped at 50% of those for the main house.
  10. Common Interest Communities: New developments with homeowners associations are barred from implementing rules against ADU construction. However, existing regulations can remain.

These regulations aim to encourage the development of ADUs, offering more housing options within urban growth areas.

Since July 1, 2018, most Oregon cities and counties allow homeowners to build Accessory Dwelling Units (ADUs) on residential properties. However, local rules on ADU size, placement, and design must be followed. Each area has its own rules for:

  1. How big the ADU can be;
  2. Where it can be located; and
  3. If it needs to look like the main house.

Local governments also have different processes for giving permits and may charge fees for building an ADU. These fees, including impact fees or system development charges, can vary a lot. Some places might not charge these fees at all, while others could charge $15,000 or more for each ADU.

In Oregon, the rules for creating Accessory Dwelling Units (ADUs) set standards to boost housing while keeping communities looking good. Understanding Oregon's ADU laws is crucial for compliance and making the most of ADU benefits. Cities must have over 2,500 people, and counties over 15,000, to fall under the ADU mandate. This supports urban housing needs. Urban Growth Boundaries (UGBs) define where ADUs can be built, promoting smart growth and land use without harming Oregon's landscapes.

Oregon's ADU laws aim to increase affordable housing. They require local governments to process ADU applications efficiently, especially in urban areas. State laws stop local rules from demanding owners live in ADUs or provide extra parking, except for vacation rentals. Setback requirements ensure ADUs are well-placed, respecting privacy and the environment. Oregon encourages updating local ADU rules to match state standards, making it easier to build ADUs and help with housing shortages.

Design and siting rules for Oregon ADUs ensure they fit well with urban settings and offer design flexibility. Oregon prefers less restrictive rules for ADUs compared to other buildings, aiming to increase housing options responsibly. The state simplifies ADU regulations, replacing complex zoning laws with clearer, state-wide standards. This helps reduce red tape and encourage ADU construction.

Oregon's approach to ADUs, including size restrictions and utility connection guidelines, is designed to integrate ADUs smoothly into neighborhoods, addressing housing needs. ADUs can't be too large compared to the main house, and shared utility connections are encouraged to keep costs down. This effort shows Oregon's commitment to innovative, affordable housing solutions.

  • Oregon ADU laws establish criteria to support housing while maintaining community aesthetics.
  • Cities over 2,500 people, and counties over 15,000, need to allow ADU construction per state mandates.
  • Urban Growth Boundaries (UGBs) are key to ADU development, limiting expansion within set geographic areas.
  • The state prohibits local ordinances from requiring owner occupancy or off-street parking for ADUs, except for vacation rentals.
  • Oregon mandates setback requirements for ADUs to ensure privacy and environmental standards.
  • Local governments in Oregon must update regulations to align with state ADU codes, promoting consistent and simplified ADU development.
  • Oregon ADU laws facilitate affordable housing by removing barriers to ADU construction and simplifying the application process.
  • Design standards for ADUs in Oregon are clear and objective, not requiring ADUs to mimic the primary residence's architecture.
  • Oregon's policies allow ADUs more flexibility in development compared to other accessory structures, avoiding strict lot size or coverage constraints.
  • ADUs in Oregon are subject to size limitations, generally not exceeding 75-85% of the primary dwelling's floor area, with specific square footage caps.
  • The state encourages the use of shared utility connections for ADUs to lower construction and development costs.
  • Oregon's comprehensive ADU regulations aim to expand housing options, reduce bureaucracy, and accommodate the state's diverse housing needs.
  • Why Homeowners Choose Gather

    Your one-stop ADU platform

    With Gather, you're not just building an ADU — you're cultivating peace of mind. Our end-to-end guidance and ongoing support mean every decision is informed, every step is intentional, and every outcome exceeds expectations. With us, your dream ADU is within reach. Here is what we do:

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    Design your perfect ADU

    With Gather, designing your ideal ADU is a breeze. We manage all the planning and permitting paperwork, ensuring you enjoy a seamless experience and complete peace of mind.

    Schedule a free ADU consultation
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    Malibu
    1,000 SQFT
    3 Bed / 2 Bath
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    Monterey
    750 SQFT
    2 Bed / 1 Bath
    Topanga
    Topanga
    600 SQFT
    1 Bed / 1 Bath
    Carmel
    Carmel
    500 SQFT
    1 Bed / 1 Bath
    Sonoma
    Sonoma
    400 SQFT
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    Marina
    300 SQFT
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    City Snapshot

    Irvine

    287,401
    Population
    96200
    Median Household Income

    Irvine is a vibrant city in Southern California known for its unique charm and diverse population. It offers a blend of urban and suburban experiences.

    Irvine, located in the heart of Orange County, California, is renowned for its master-planned communities, high-quality education system, and thriving business environment. With a population of approximately 287,401 residents, Irvine combines suburban comfort with urban sophistication, making it one of the most desirable places to live and work in Southern California.

    Geography and History

    Founded in the 1960s by the Irvine Company, the city was meticulously designed with a focus on community, green spaces, and innovation. Irvine's strategic location near the coast and major freeways makes it a central hub in Orange County, providing easy access to nearby attractions and cities.

    Local Economy

    Irvine's economy is diverse and robust, driven by several key sectors:

    • Technology: Home to numerous tech companies and startups, including major players like Blizzard Entertainment and Broadcom.
    • Education: The University of California, Irvine (UCI) is a major contributor to the city's intellectual and economic landscape.
    • Healthcare: Several top-tier hospitals and medical centers are located in Irvine.
    • Real Estate: The Irvine Company plays a significant role in the local real estate market, developing residential, commercial, and retail properties.
    • Finance and Business Services: A strong presence of financial institutions and corporate headquarters.

    Popular Neighborhoods

    Irvine's neighborhoods are carefully planned to provide a high quality of life, with an emphasis on safety, amenities, and community.

    • Woodbridge: Known for its lakes, parks, and family-friendly environment.
    • Turtle Rock: Offers scenic views, hiking trails, and proximity to UCI.
    • Northwood: Features excellent schools and spacious homes.
    • Great Park: A newer development centered around the Orange County Great Park, with a mix of housing, parks, and sports facilities.
    • Cypress Village: A vibrant, growing community with modern amenities and convenient access to shopping and dining.

    Real Estate Market

    Irvine's real estate market is known for its stability and high property values. The city's well-maintained neighborhoods, excellent schools, and abundant amenities make it a highly desirable location for families and professionals alike. Housing options range from luxurious single-family homes to modern condos and apartments.

    ADU Regulations in Irvine

    In response to California's housing crisis, Irvine has implemented ADU regulations to increase housing options and affordability.

    • Zoning: ADUs are permitted in all residential zones and mixed-use zones that allow residential uses.
    • Types of ADUs: Both attached and detached ADUs are allowed, as well as Junior ADUs (JADUs).
    • Size Limits:
      • Detached ADUs: Up to 1,200 sqft.
      • Attached ADUs: Up to 50% of the primary dwelling's living area or 1,200 sqft, whichever is less.
      • JADUs: Up to 500 sqft.
    • Height Restrictions: Detached ADUs are generally limited to 16 feet in height, with some exceptions allowing up to 25 feet.
    • Parking: Generally, no additional parking is required for ADUs, especially if they're located within half a mile of public transit.
    • Owner Occupancy: As of 2020, there is no owner-occupancy requirement for ADUs built between January 1, 2020, and January 1, 2025. Owner occupancy is required for properties with JADUs.
    • Approval Process: ADUs that meet certain criteria are eligible for ministerial approval, streamlining the process.
    • Multiple ADUs: In multi-family properties, up to two detached ADUs are allowed, or ADUs for 25% of the existing units within the structure, whichever is greater.
    • Impact Fees: Reduced impact fees for ADUs smaller than 750 sqft.
    • Design Standards: ADUs must be designed to be compatible with the primary residence and neighborhood character.

    These regulations are designed to support the development of ADUs, providing more diverse and affordable housing options in Irvine.

    Cultural Landmarks and Unique Aspects

    Irvine is distinguished by its cultural landmarks and unique aspects, which contribute to its vibrant community life.

    • Irvine Spectrum Center: A premier shopping, dining, and entertainment destination featuring a giant Ferris wheel.
    • Orange County Great Park: Offers a variety of recreational amenities, including sports fields, a carousel, and a farmers' market.
    • University of California, Irvine (UCI): A top-ranked public university known for its research, education, and cultural events.
    • Irvine Ranch Historic Park: Preserves the city's agricultural heritage with historic buildings and exhibits.
    • Cultural Festivals: Irvine hosts numerous cultural festivals, including the Irvine Global Village Festival, celebrating the city's diverse population.

    In conclusion, Irvine's commitment to thoughtful urban planning, high-quality education, and economic diversity makes it a standout city in Southern California. The implementation of ADU regulations reflects the city's proactive approach to addressing housing needs while maintaining its high living standards. With its unique blend of cultural landmarks, economic opportunities, and community-focused amenities, Irvine continues to attract residents and businesses seeking a dynamic and prosperous environment.

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    Schedule a free ADU consultation

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    Frequently Asked Questions

    What is an ADU and how can you help me build one?

    An ADU, or Accessory Dwelling Unit, is also known as a tiny home, granny flat, in-law unit, or garage apartment. We help homeowners by providing expert guidance and tools to navigate the process of building an ADU, from zoning and permitting, to design and size considerations, to cost estimation, and through the construction process itself.

    How can I determine if my local area allows for ADU construction?

    Our services include assistance with zoning and permitting. We help you identify your property's specific zoning requirements and the necessary permits for ADU construction, ensuring your project stays compliant with local regulations.

    What does the construction process for building an ADU look like?

    We offer information and resources on the construction process, timelines, and best practices for building an ADU. Additionally, we have a network of trusted builders you can partner with to ensure a seamless, efficient, and high-quality build for your ADU.

    What is included in your feasibility report for building an ADU?

    With the Gather Feasibility Report, you can confidently embark on your ADU journey, knowing you've got a solid foundation and a clear roadmap to success. Let us help you transform your space into a functional, comfortable, and profitable asset today.

    We
       
    1) Thoroughly analyze your property records for a tailored assessment,        
    2) Work with city and county authorities on your behalf for a hassle-free experience,        
    3) Secure a preliminary "pre-approval" from city/county for your peace of mind,        
    4) Deliver a comprehensive report document detailing your property's ADU possibilities.            

    Embark on your ADU adventure with Gather ADU, and make the most of your property's potential without the stress or hassle.

    Do I have to commit to the entire ADU construction project right away?

    No, it isn't required. GatherADU offers support at every step of the ADU process, allowing you to proceed without making an immediate full commitment. You have the flexibility to progress at your own pace and opt for pay-as-you-go.

    Where does GatherADU operate?

    GatherADU provides ADU design and planning services nationwide with focus on California, Washington, Oregon, and Georgia.