Chino Hills ADU Regulations & Building Guide

Chino Hills 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.

Chino Hills Local Requirements

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

Common local considerations in Chino Hills 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)

Chino Hills, California, with a population of approximately 78,131, is a scenic city located in San Bernardino County. Known for its picturesque landscapes, rolling hills, and well-planned residential neighborhoods, Chino Hills combines suburban tranquility with a high quality of life. The city's approach to Accessory Dwelling Units (ADUs) reflects its commitment to accommodating growth while preserving its community character.

Geography and History

Chino Hills is situated in the foothills of the Chino Hills State Park, providing residents with expansive views and a connection to nature. The city's history includes agricultural roots, transitioning into a suburban community with a focus on family-friendly amenities and green spaces.

Local Economy

Chino Hills’ economy features:

• Retail and Services: The city has a variety of local shops, dining options, and service businesses.
• Education: Home to several public and private schools, including Chino Hills High School.
• Healthcare: Includes local medical facilities and proximity to major hospitals in the San Bernardino and Riverside areas.

Popular Neighborhoods

Chino Hills offers diverse neighborhoods:

• Vellano: A luxury community with large homes, golf course views, and upscale amenities.
• Oak Tree Downs: Known for its well-maintained homes and family-friendly atmosphere.
• Butterfield Ranch: Features larger lots and proximity to parks and schools.
• Rolling Ridge: Offers scenic views and a mix of traditional and modern homes.

Real Estate Market

The real estate market in Chino Hills is characterized by:

• Single-Family Homes: Predominantly single-family residences with spacious lots.
• Property Values: Generally high due to the city's desirable location and amenities.
• New Developments: Increasing interest in new construction and ADUs.

ADU Regulations in Chino Hills

Chino Hills’ ADU regulations are designed to accommodate residential growth while maintaining the city’s suburban character:

• Zoning: ADUs are permitted in all residential zones, with specific guidelines for different zones.
• Types of ADUs: Includes detached ADUs, attached ADUs, and conversions of existing structures such as garages.
• 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.
• Height Restrictions: Generally limited to 16 feet for detached ADUs, with potential exceptions based on design review.
• Parking: Typically requires one additional parking space per ADU. Reduced parking requirements may apply if the ADU is located near public transit or within a certain distance from amenities.
• Owner Occupancy: No owner-occupancy requirement for newly constructed ADUs.
• Approval Process: ADUs that meet the city’s guidelines are eligible for streamlined approval, making the process more efficient.
• Design Standards: ADUs must be compatible with the primary residence and neighborhood character. This includes considerations for architectural style, materials, and landscaping.
• Multiple ADUs: Generally, one ADU is allowed per residential lot, with potential for additional units under specific conditions or if a variance is obtained.

Cultural Landmarks and Unique Aspects

Chino Hills is known for:

• Parks and Recreation: Extensive parks, trails, and recreational facilities, including the Chino Hills State Park.
• Annual Events: Community events such as the Chino Hills Annual Eggstravaganza and local farmers' markets.
• Education: The city is known for its highly rated public schools and community focus on education.

Chino Hills’ ADU regulations are designed to facilitate residential growth and enhance housing options while preserving the city’s suburban charm. With clear guidelines and streamlined processes, Chino Hills aims to address its housing needs effectively, maintaining its appeal as a desirable place to live.

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