Simi Valley ADU Regulations & Building Guide

Simi Valley is a renowned city in Southern California, known for its rich history and modern amenities. The city offers a mix of recreational activities and cultural events for residents and visitors alike.

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.

Simi Valley Local Requirements

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

Common local considerations in Simi Valley 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)

Simi Valley, California, is a city located in Ventura County, known for its suburban atmosphere, scenic views, and family-friendly environment. With a population of approximately 125,613, Simi Valley offers a mix of residential charm and community amenities.

Geography and History

Simi Valley is situated about 30 miles northwest of Los Angeles and is surrounded by the Santa Susana Mountains and the Simi Hills. The city was incorporated in 1969 and has grown from its agricultural beginnings into a thriving suburban community.

Local Economy

Simi Valley’s economy is diverse, with key sectors including:

• Retail and Services: The city features shopping centers like the Simi Valley Town Center and various local businesses.
• Healthcare: Includes facilities such as Simi Valley Hospital, which provides significant healthcare services and employment.
• Education: Home to several schools and institutions, including the Simi Valley Adult School.
• Manufacturing and Technology: The city hosts a mix of light manufacturing and technology companies.
• Tourism and Recreation: Attractions include local parks, historical sites, and recreational facilities.

Popular Neighborhoods

Simi Valley offers a variety of neighborhoods catering to different preferences:

• Wood Ranch: Known for its upscale homes, golf courses, and family-oriented amenities.
• Madera: Features a suburban feel with well-maintained homes and access to local schools and parks.
• Santa Susana: Offers a mix of residential and commercial properties with scenic views.
• Texas Tract: A family-friendly neighborhood with tree-lined streets and community parks.
• Simi Valley Estates: Known for larger homes and proximity to recreational facilities.

Real Estate Market

Simi Valley’s real estate market is characterized by stable demand and competitive pricing. The market includes single-family homes, townhouses, and newer developments. Housing prices reflect the city’s appeal as a suburban retreat with convenient access to the Los Angeles metropolitan area.

ADU Regulations in Simi Valley

Simi Valley has established Accessory Dwelling Unit (ADU) regulations that align with California state laws while addressing local needs. These regulations are designed to facilitate ADU development while maintaining the city’s suburban character.

• Zoning: ADUs are permitted in residential zones, including single-family and multi-family districts.
• 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, though exceptions may apply based on site-specific conditions.
• Parking: Generally, no additional parking is required for ADUs if located within a half-mile of a transit stop. In other areas, one additional parking space may be required.
• Owner Occupancy: As of recent updates, there is no owner-occupancy requirement for ADUs, though owner occupancy is required for properties with JADUs.
• Approval Process: ADUs that meet specific criteria are eligible for a streamlined review process to expedite approvals.
• 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 often reduced to encourage development and affordability.
• Design Standards: ADUs must be designed to complement the primary residence and adhere to neighborhood character, including architectural compatibility and landscaping requirements.

These regulations reflect Simi Valley’s commitment to increasing housing options while preserving the city’s suburban and residential character.

Cultural Landmarks and Unique Aspects

Simi Valley is known for several unique aspects and cultural landmarks:

• Ronald Reagan Presidential Library: A major cultural attraction featuring exhibits on the presidency of Ronald Reagan and American history.
• Simi Valley Historical Society Museum: Showcases local history and heritage through exhibits and educational programs.
• Strathearn Historical Park: Preserves historical buildings and offers insights into the city’s early development.
• Local Parks: Includes recreational areas such as Rancho Simi Community Park and the Santa Susana Pass State Historic Park, providing opportunities for outdoor activities and community events.
• Cultural Events: Hosts various community events, including the Simi Valley Summer Concerts in the Park and the Simi Valley Cajun & Blues Music Festival.

Simi Valley’s ADU regulations aim to support the city’s housing needs while maintaining its suburban and residential character. With its diverse neighborhoods, cultural landmarks, and high quality of life, Simi Valley offers a unique living experience in Ventura County. The city’s approach to ADU development reflects its commitment to accommodating growth and enhancing the community, ensuring that Simi Valley remains a desirable and vibrant place to live.

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