Downey ADU Regulations & Building Guide

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

California State ADU Laws

California has some of the most progressive ADU legislation in the country. Recent laws including AB 68, SB 13, and AB 881 have significantly streamlined the ADU approval process and reduced barriers for homeowners.

Key California ADU Regulations:

• Size Limits: Detached ADUs can be up to 1,200 sq ft. Attached ADUs can be up to 50% of the primary dwelling or 1,200 sq ft, whichever is less.
• Setbacks: Minimum 4-foot side and rear setbacks for detached ADUs.
• Height: Generally up to 16 feet, with some exceptions for two-story ADUs (up to 25 feet in certain zones).
• Parking: No additional parking required in most cases, especially near transit.
• Owner Occupancy: No owner-occupancy requirement until 2025 for most ADUs.

Downey Local Requirements

While California state law provides baseline regulations, Downey may have additional local requirements. GatherADU's team stays current with Downey's specific zoning codes, architectural guidelines, and permit processes to ensure your ADU project meets all requirements.

Common local considerations in Downey include:

• Design review requirements and architectural standards
• Utility connection fees and impact fees
• Fire department access requirements
• Neighborhood-specific overlay zones

California law (AB 68, AB 881, SB 9, and subsequent legislation) guarantees your right to build ADUs. Cities cannot:

• Require owner-occupancy for ADUs permitted after 2020
• Require additional parking for ADUs near transit
• Charge impact fees for ADUs under 750 sq ft
• Deny ADUs that meet state minimum standards
• Impose lot coverage limits that prevent a 800 sq ft ADU

If you believe your ADU application is being unfairly denied, California HCD can intervene on your behalf.

California ADU Legislation Overview

California leads the nation in ADU-friendly legislation. The state has passed numerous laws to encourage ADU construction as a solution to the housing crisis.

Key California ADU Laws:

• AB 68 (2020): Reduced local government review time and expanded ADU construction options.
• SB 13 (2020): Limited impact fees and reduced owner-occupancy requirements.
• AB 881 (2020): Prohibited minimum lot size requirements and allowed JADUs in all zones.
• AB 2221 (2022): Further streamlined the ADU approval process.
• SB 897 (2022): Increased height limits for ADUs in certain zones.

California ADU Benefits:

• Property value increase of 20-30% on average
• Rental income potential of $1,500-$3,500+ monthly
• Housing flexibility for family members
• No owner-occupancy requirements (until 2025)

Downey, California, is a city located in Los Angeles County with a population of approximately 111,772 residents. Known for its rich history and suburban charm, Downey offers a blend of residential tranquility and accessibility to metropolitan amenities. The city has become increasingly popular as a residential area due to its community-oriented atmosphere and convenient location.

Geography and History

Downey is situated approximately 13 miles southeast of downtown Los Angeles. Founded in 1873, the city has a deep historical significance and was one of the earliest communities established in the area. Downey is known for its historical landmarks and its role in the development of the American space program, as it was home to the former Rocketdyne facility.

Local Economy

Downey’s economy is diverse, with several key sectors:

• Retail and Services: The city features various shopping centers, restaurants, and service businesses.
• Healthcare: Downey is home to the Downey Regional Medical Center and other healthcare facilities.
• Education: Downey Unified School District serves the city, along with private educational institutions.
• Manufacturing and Industry: Historically, Downey had a strong manufacturing base, though this has shifted towards more service-oriented and retail businesses in recent years.
• Entertainment: The city’s proximity to Los Angeles allows residents to easily access a wide range of entertainment and cultural activities.

Popular Neighborhoods

Downey features a mix of residential neighborhoods:

• Downey Historic District: Known for its well-preserved mid-century architecture and historical significance.
• North Downey: Offers larger homes and a more suburban feel with good access to parks and schools.
• South Downey: Features a mix of residential and commercial properties with convenient access to local amenities.
• East Downey: Known for its family-friendly environment and proximity to schools and parks.
• West Downey: A residential area with a variety of housing options and community facilities.

Real Estate Market

Downey’s real estate market includes a range of housing options from single-family homes to apartment complexes. The market has been relatively stable with moderate growth, driven by the city's desirable location and community amenities. Recent trends include rising property values and an increasing interest in residential development.

ADU Regulations in Downey

Downey’s ADU regulations are designed to enhance housing options while maintaining community standards:

• Zoning: ADUs are permitted in residential zones. Some mixed-use zones that include residential uses also allow ADUs.
• Types of ADUs: Both attached and detached ADUs are permitted, as well as Junior ADUs (JADUs) and conversions of existing structures.
• Size Limits:
  • Detached ADUs: Up to 1,200 sqft or 50% of the primary dwelling’s living area, whichever is less.
  • 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, although there may be exceptions for certain designs.
• Parking: Generally, no additional parking is required for ADUs if they are located within a half-mile radius of public transit. In other cases, one additional parking space may be required.
• Owner Occupancy: As of 2020, there is no owner-occupancy requirement for newly built ADUs. However, JADUs must meet owner-occupancy requirements.
• Approval Process: ADUs that meet specific criteria may qualify for a streamlined approval process, including ministerial review.
• 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: Impact fees for ADUs are typically reduced to encourage development, especially for smaller units.
• Design Standards: ADUs must be designed to complement the primary residence and the character of the neighborhood, including architectural style and materials.

These regulations are intended to increase housing options in Downey while preserving the city’s residential character and enhancing community development.

Cultural Landmarks and Unique Aspects

Downey is known for several unique features and landmarks:

• Historic Downey Theater: A landmark theater that has been a center for community events and entertainment since its opening in 1957.
• Downey City Library: Known for its architectural design and extensive collection of books and resources.
• Rocketdyne Facility: Historically significant for its role in the American space program.
• Downey Historical Society: Offers insights into the city’s rich history through various programs and exhibits.
• Columbus High School: An important educational institution with historical significance.

Downey’s ADU regulations aim to address the city's housing needs while maintaining its suburban charm and historical character. With its strong community focus, diverse neighborhoods, and unique landmarks, Downey offers a high quality of life and a welcoming environment for residents. The city’s approach to ADUs reflects its commitment to providing flexible housing solutions while preserving its distinctive community atmosphere.

‍