Arcadia ADU Checklist

Zoning Regulations in Arcadia

Arcadia’s ADU zoning regulations provide options for attached, detached, and garage conversion ADUs. Each type has a specific size, setback, and parking requirements. Builders must consider lot size, height limits, and design guidelines to ensure compliance and a smooth permitting process.

ADU Size Limitations

Arcadia’s regulations provide flexible guidelines for customizing your ADU to suit your needs and lot size. The size restrictions, determined by your property and zoning, streamline this procedure, making it more straightforward and efficient.

ADU Height Limitations

For both attached and detached ADUs, it is recommended to limit the height to a maximum of 16 feet. This promotes a harmonious integration with the surrounding neighborhood and contributes to a pleasant streetscape.

Building coverage

Attached ADUs should not exceed 50% of the floor area of the existing single-family dwelling. For detached ADUs, there is a maximum limit of 40% of the lot area, so plan accordingly.

Location

Arcadia’s zoning regulations carefully determine the permissible locations for your ADU. These regulations come with specific rules and guidelines that ensure the proper placement and compliance of your ADU within the community.

Single-Family:

• ADUs are generally allowed on most residentially zoned single-family lots, but always double-check your specific zoning district for any restrictions.
• You have more flexibility in choosing the location for your ADU, whether attached to the existing house, detached in the backyard, or even converted from existing spaces like garages.
• Ensure that your ADU adheres to setback requirements by maintaining the minimum distance from property lines and other structures.

Duplexes and Multi-Family:

• ADUs are allowed in duplex and multi-family zones, but restrictions on the number and location apply based on zoning designation and lot size. Size limitations are typically tied to the existing dwelling unit, or lot size, and detached ADUs may be preferred based on zoning rules.

Exterior details

Match your ADU’s exterior to the main house or opt for a complementary style. Materials like wood, brick, and stucco blend well with Arcadia’s architectural character.

Parking

One designated parking space is required for your ADU, whether attached or detached. It is advisable to verify with the city of Arcadia Planning Department for any exceptions that may apply based on specific circumstances.

Setbacks and Buffer Zones

Maintaining a respectful distance from neighboring properties is essential. Observing setbacks from property lines, driveways, and structures to ensure space, light, and privacy. Thoughtful landscaping can create buffer zones that enhance privacy for the ADU and adjacent homes.

Minimum Lot Area (RF Zone)

Arcadia’s Residential Family (RF) zoning district allows ADU development within specific regulations, including a minimum lot area requirement to accommodate both the primary dwelling and the ADU.

Connection For Utilities

Depending on the size and location of your ADU, it may be necessary to consider new or upgraded utility connections. Planning and considering costs and permits for connecting to water, sewer, and electrical systems is important.

It is advisable to consult with licensed professionals. This way, you can determine if your plans are feasible and understand the costs involved. This proactive approach ensures you’re well-prepared and can make informed decisions while considering all the necessary factors.

Fire Safety

Arcadia places a high priority on fire safety by mandating the installation of smoke detectors, and carbon monoxide detectors, and the inclusion of proper fire escape routes in all ADUs. Depending on the size and construction materials of the ADU, additional regulations may need to be followed.

Room Specifications

• Sleeping Areas: ADU must be at least 70 square feet and ensure a minimum ceiling height of 7 feet for comfort. Each bedroom should include a closet or similar storage space and windows to allow for natural light and ventilation.
• Kitchen: Well-equipped kitchen improves the functionality of an ADU. Proper planning for plumbing and electrical connections is crucial for refrigerators and stoves. Adequate ventilation is essential for dispersing cooking fumes and controlling moisture.
• Bathroom: A full bathroom must be at least 35 square feet, while a half bathroom should be a minimum of 18 square feet. Adequate ventilation and exhaust systems are required. Including accessible features in the bathroom design is highly recommended to meet the diverse needs of future residents.
• Storage: The key to an organized and spacious ADU is incorporating built-in solutions or designated areas for enhanced utility. Creative approaches, such as utilizing under-stairs spaces and incorporating built-in cabinets, will help keep your living space tidy and efficient.

Short-term Rentals and Home Occupations Regulations

Arcadia has strict regulations prohibiting short-term rentals or home occupations for less than 28 consecutive days. Home occupations are generally prohibited unless they meet specific criteria, such as being conducted entirely within the home and not causing excessive traffic or noise. If you’re considering using an ADU for short-term rentals or home occupations in Arcadia, exploring alternative uses that comply with the city’s zoning regulations is important.

Building Codes

Building codes ensure the safety and quality of ADUs by addressing structural integrity, fire safety, and electrical and plumbing systems. In Arcadia, the California Building Code (CBC) sets minimum standards for construction materials, design elements, and installation practices. The city may also have additional regulations specific to ADUs, addressing energy efficiency, accessibility, and soundproofing. Before starting your ADU construction, it’s essential to familiarize yourself with the Arcadia Building Codes.

ADU Permit Arcadia Guidelines

Arcadia supports the development of Accessory Dwelling Units (ADUs), but it’s important to follow regulations for proper planning and construction. Obtaining necessary permits is crucial to meet safety requirements and zoning standards.

Property Requirements

The City of Arcadia has specific property requirements that must be met before an ADU can be constructed. These include minimum lot size, setbacks, and other zoning regulations. Ensuring your property meets all requirements before proceeding with the ADU construction is important.

Parking

Regulations require at least one off-street parking space for detached ADUs unless exempted. Exemptions may apply to ADUs under 500 square feet or those near public transit. Providing accessible parking can enhance the attractiveness and market value of your ADU.

Front setbacks

Maintaining a harmonious streetscape is crucial. Detached ADUs must have a minimum 15-foot front setback from the property line. This allows for enough space between your ADU and the street, ensuring visual aesthetics and pedestrian safety.

Side and rear setbacks

Attached ADUs must have a minimum 4-foot setback from side and rear property lines. In contrast, detached ADUs need a 5-foot sideline setback and a 10-foot rear property line setback. Additional setbacks may apply depending on your project and lot size.

Open space and rear yards

For ADUs larger than 500 sq ft, a minimum of 25% open space on the lot is required. This can include patios, decks, landscaping, or a combination of these elements. Detached ADUs must also have a minimum 5-foot rear yard setback.

Properties That Qualify

To build an accessory dwelling unit (ADU) in Arcadia, there are certain requirements to consider. The property should be zoned for residential use, and specific zoning designations like R-1, R-2, R-M, or PD are acceptable. Different neighborhoods and areas, such as mixed-use or urban residential zones, also allow ADUs.

The number of ADUs allowed depends on the property type, with single-family homes permitted one detached ADU or one junior ADU. Duplex or multi family homes may be allowed up to two detached ADUs. Additional factors include lot size, setbacks, and open space requirements. For further clarification, contact the City of Arcadia Planning Department.

Development Standards

Single-family

• Attached: The maximum size allowed is 850 sq ft for a studio/1 bedroom and 1,000 sq ft for 2 bedrooms, no more than 2 bedrooms permitted. It should not exceed 50% of the main residence’s floor area. Additionally, there should be minimum side and rear yard setbacks of 4 feet.
• Detached: Studios or one-bedroom units are limited to 850 sq ft, while two-bedroom units have a maximum of 1,000 sq ft and two bedrooms. A minimum building separation of 6 feet from the main residence is required. Setback requirements include 5 feet from the side yard property line and 10 feet from the rear yard property line for privacy and distancing.

Duplex properties

• Attached: One attached ADU per unit is permitted, subject to the same size limitations as single-family homes. The ADU’s floor area must not exceed 50% of the unit’s total floor area.
• Detached: Depending on specific zoning and lot size, up to two ADUs may be permitted. Each unit is subject to the same regulations as single-family detached ADUs.

Multifamily properties

• Attached: One attached ADU per unit is permitted, subject to the same size limitations as single-family homes. The ADU cannot exceed 50% of the unit’s floor area. The total number of ADUs on the lot must not exceed 25% of the existing dwelling units.
• Detached: A maximum of two detached ADUs are permitted, subject to the same size limitations and setbacks as single-family homes. The total number of ADUs on the lot must not exceed 25% of the existing dwelling units.

Junior ADUs (JADUs)

Junior ADUs offer property owners a unique option to create smaller living spaces within residential structures. They can be attached to or carved out of single-family homes and duplexes, with a maximum area of 500 square feet and more limited kitchen facilities. JADUs must have a separate entrance and utilities and are included in the total ADU count allowed on the property.

Property Designations

• Flood zones: Some areas may be in designated flood zones, which can affect the feasibility of ADU construction. Check the FEMA Flood Map Service Center to determine the flood zone status. If your property is in a flood zone, implementing floodproofing or elevating the structure may impact the design and budget.
• Geohazard zones: Properties in Arcadia’s geohazard zones face risks like landslides and earthquakes. Homeowners must determine their property’s geohazard classification to ensure safe ADU construction. ADUs in these zones may require specialized engineering practices, influencing design and project costs.
• Historic designation: ADUs in historic districts or designated landmarks have additional restrictions to preserve historical integrity. This may impact ADU design and materials. Contact Arcadia’s Historic Preservation Commission for guidance on complying with heritage regulations.
• Easements: Provide access or use rights to specific areas on your property, which can affect ADU placement and construction. Utility, drainage, and public access easements are common examples. Review your property’s title report and plat map to identify existing easements and ensure your ADU design doesn’t interfere with their designated use.

Pre-Approved Duarte ADUs

The City of Arcadia does not have a pre-approved ADU program. This means that all ADU plans need to be submitted individually for review and approval by the City Planning Department. Although it may seem like an additional step, it offers more flexibility in designing an ADU that precisely meets your requirements and property.

The Arcadia City website offers a detailed ADU webpage with valuable resources such as guidelines, regulations, and downloadable forms. It also provides a step-by-step guide on building an ADU, covering everything from initial planning to final inspections.

Start Your ADU Project Today!

Increase property value and generate rental income or extra living space by constructing an ADU in Arcadia. We’ll ensure a smooth and successful development process with careful planning and adherence to local guidelines. Schedule a consultation today by calling 877-979-3485 and get started on your ADU project!

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