Can you build an ADU in San Bernardino County?

As housing demands continue to surge, Accessory Dwelling Units (ADUs) have emerged as a popular solution for homeowners seeking to maximize their property's potential. In San Bernardino County, the trend towards building ADUs is gaining momentum, driven by the need for additional living spaces and the potential for rental income. But can you build an ADU in San Bernardino County? This comprehensive guide will walk you through the process, regulations, and benefits of adding an ADU to your property.

What is an ADU?

An Accessory Dwelling Unit (ADU) is a secondary housing unit on the same lot as a primary residence. ADUs can take various forms, including detached units, attached units, or conversions of existing spaces like garages or basements. They offer a versatile solution to increasing housing availability without the need for new land development.

Why Build an ADU in San Bernardino County?

San Bernardino County has seen a spike in demand for ADUs due to their flexibility and potential for generating rental income. Additionally, ADUs can provide housing for family members, offer a downsizing option for property owners, or serve as an office or studio space. The county's regulations are designed to facilitate the development of ADUs while maintaining community standards and ensuring environmental sustainability.

Permitting Process in San Bernardino County

Building an ADU in San Bernardino County involves navigating a series of regulatory steps to ensure compliance with local and state laws. Here's an overview of the permitting process:

1. Initial Application

The process begins with submitting a building permit application to the San Bernardino County Land Use Services Department. The application must include detailed plans and site information.

2. Zoning Review

The planning department reviews the application to ensure it meets local zoning regulations. Key considerations include size restrictions, setbacks, and owner-occupancy requirements.

3. Building Code Compliance

The building department examines the application for adherence to California Building Codes and San Bernardino County Fire Code. This includes ensuring that materials used are durable and suitable for the type of ADU being built.

4. Utility Connections

Utility connections, including water, sewer, gas, and electricity, must be properly established and inspected. ADUs less than 750 square feet may benefit from waivers on impact fees, making smaller units more affordable.

5. Inspections

Several inspections are conducted throughout the construction process to ensure compliance with safety and building standards. These include checks on fire safety features, sanitation facilities, and structural integrity.

6. Approval

Once all inspections are passed, the county issues a final approval, allowing the ADU to be occupied.

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Regulations and Zoning Requirements

Size and Design Restrictions

San Bernardino County imposes specific size and design limitations on ADUs to maintain neighborhood character and ensure safety:

• Size: Detached and attached ADUs typically range from 500 to 1,200 square feet, while Junior ADUs (JADUs) are capped at 500 square feet.
• Height: ADUs must not exceed the height of the primary dwelling or a prescribed limit set by local guidelines.
• Setbacks: Front yard setbacks vary by zoning laws, while side and rear yard setbacks are commonly a minimum of 5 feet.

Owner-Occupancy Requirements

Owner-occupancy rules have been relaxed with recent legislative updates. Under Assembly Bill 976, ADUs built before 2020 or after 2025 are not subject to owner-occupancy requirements, offering homeowners greater flexibility.

Parking Guidelines

Parking requirements are designed to be flexible:

• ADUs under 750 square feet: No additional parking required if within a half-mile of public transit.
• ADUs over 750 square feet: Typically, one parking space is required, except in specific exemptions such as historical districts.
• Garage Conversions: No replacement parking is required when converting existing garages.

Financial Considerations

Building an ADU involves a range of financial factors, from initial construction costs to potential fee waivers and the impact on property value.

Cost Estimates

ADU construction costs in San Bernardino can start as low as $50,000, varying based on size, design, and materials. It’s crucial to prepare for unforeseen expenses that may arise during construction.

Impact Fees and Waivers

San Bernardino offers a tiered schedule of impact fees based on ADU size. Units under 750 square feet are exempt from these fees, providing a financial incentive for smaller ADUs. Additionally, school fees are waived for these smaller units.

Utilities and Service Connections

Proper utility connections are essential for ADU construction:

• Water: Developers must connect to the existing water supply, with impact fees potentially waived for units under 750 square feet.
• Sewer: Sewer hookups must integrate with the municipal system, adhering to environmental health standards.
• Fire Safety: Compliance with local fire codes, including potential fire sprinkler requirements, is mandatory.
• Gas and Electricity: Connections must meet county codes, ensuring safety and sustainability.
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Parking Guidelines

San Bernardino County has crafted parking guidelines to balance housing availability with practical transportation and neighborhood demands:

• ADUs under 750 sqft: No additional parking required if within a half-mile walking distance of public transit.
• ADUs over 750 sqft: Generally, one parking space is mandated, with certain exemptions.
• Garage Conversions: No replacement parking required when converting existing garages.
• Tandem Parking: Accepted unless specific safety or maneuverability concerns arise.
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Zoning and Land Use

Understanding zoning laws can help streamline the planning process:

• Single-Family Zones: Focus on preserving neighborhood character while integrating ADUs.
• Multi-Family Zones: Structured to support higher density but ensure adequate services and infrastructure.
• Lot Coverage: Controls the proportion of a lot covered by buildings to maintain healthy living environments.

Building Code Compliance

Strict adherence to building codes ensures safety and quality:

• Materials: Must be durable and conform to quality standards.
• Fire Safety: Includes smoke detectors and fire-resistant materials.
• Sanitation: Proper bathroom and kitchen facilities with compliant sewer and water connections.
• Space Requirements: Minimum size and maximum occupancy rules to prevent overcrowding.

Closing Remarks

Building an ADU in San Bernardino County is not only feasible but also a smart investment for homeowners looking to enhance property value and generate rental income. By understanding and navigating the county’s regulations and permitting process, you can turn your vision of an ADU into a reality. With flexible zoning laws, financial incentives, and a clear path to compliance, creating an ADU in San Bernardino County is a venture worth exploring.

Whether you’re seeking additional living space for family, a potential rental unit, or a personal retreat, an ADU offers a versatile solution. Embrace the opportunity to contribute to the housing stock while enjoying the benefits of your own accessory dwelling unit. Get a quote for your ADU project

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