San Carlos ADU Zoning And Building Standards

Navigating San Carlos ADU zoning and building standards is crucial for homeowners seeking to maximize their property’s potential. This comprehensive guide will help you understand the requirements, restrictions, and opportunities for creating an ADU that complies with local regulations while meeting your unique needs and enhancing your property’s value.

Our team of experienced professionals is here to guide you through the complex process of planning, designing, and constructing your ADU in San Carlos. We stay up-to-date with the latest zoning and building standards, ensuring that your project is compliant and successful from start to finish.

San Jose ADU Zoning and Building Standards

Property Requirements

Before embarking on your ADU project, it’s essential to understand the property requirements in San Carlos. These requirements vary depending on the zoning of your lot, whether it’s single-family, duplex, or multi-family. Factors such as lot size, setbacks, and existing structures will influence the feasibility of your ADU.

Building Size

The allowed building size for your ADU in San Carlos depends on the zoning of your property. Single-family zoned lots have different size restrictions compared to duplex and multi-family zoned lots. Understanding these size limitations is crucial for designing an ADU that meets your needs while adhering to local regulations.

  • Single-Family Zoned Lots:

For single-family zoned lots in San Carlos, the maximum allowed size for an ADU is 1,200 square feet or 50% of the primary dwelling’s living area, whichever is less. This provides ample space for a comfortable and functional living area while maintaining a balanced relationship with the main house.

  • Duplex Family Zoned Lots:

Duplex family zoned lots in San Carlos offer more flexibility for ADU construction. The maximum allowed size for an ADU on these lots is 1,500 square feet or 50% of the primary dwelling’s living area, whichever is less. This increased size allowance enables the creation of more spacious ADUs.

  • Multi-Family Zoned Lots:

Multi-family zoned lots in San Carlos provide the most generous size allowances for ADUs. The maximum allowed size for an ADU on these lots is 1,800 square feet or 50% of the primary dwelling’s living area, whichever is less. This enables the construction of larger, more versatile ADUs.

  • Attached ADUs:

Attached ADUs in San Carlos must be physically connected to the primary dwelling and share a common wall. They are subject to the same size restrictions as detached ADUs.

  • Detached ADUs:

Detached ADUs in San Carlos are standalone structures, separate from the primary dwelling. They must adhere to the size restrictions based on the property’s zoning and maintain required setbacks.

Owner-occupancy

In San Carlos, owner-occupancy is not required for properties with an ADU. This means that both the primary dwelling and the ADU can be rented out, providing more flexibility for homeowners. However, it’s important to note that this may be subject to change based on future legislative updates.

Number of Units Allowed

San Carlos allows for the construction of one ADU per single-family zoned lot, one ADU per duplex family zoned lot, and multiple ADUs on multi-family zoned lots, depending on the number of existing units. JADUs (Junior Accessory Dwelling Units) may also be permitted in addition to an ADU.

San Carlos Building Height

The allowed building height for ADUs in San Carlos varies depending on the zoning of the property and whether the ADU is attached or detached. It’s crucial to understand these height restrictions to ensure that your ADU design complies with local regulations and maintains a harmonious relationship with neighboring properties.

  • Single-family: For single-family zoned lots in San Carlos, the maximum allowed height for a detached ADU is 16 feet, while attached ADUs may be constructed up to the height of the primary dwelling, not exceeding the allowable maximum height specified in the single-family neighborhood zoning rules.
  • Duplex family: Duplex family zoned lots in San Carlos allow for slightly taller ADUs compared to single-family lots. The maximum allowed height for a detached ADU on a duplex family zoned lot is 18 feet, while attached ADUs may be built up to the height of the primary dwelling.
  • Multi-family: Multi-family zoned lots in San Carlos offer the most generous height allowances for ADUs. The maximum allowed height for a detached ADU on a multi-family zoned lot is 20 feet, while attached ADUs may be constructed up to the height of the primary dwelling, subject to zoning regulations.

San Carlos Building Size

San Carlos has specific building size requirements for ADUs based on the zoning of the property. These size restrictions ensure that ADUs are proportional to the primary dwelling and maintain a balanced relationship with the surrounding neighborhood. Understanding these size limitations is essential for designing a functional and compliant ADU.

  • Single-Family Freedom: For single-family zoned lots in San Carlos, the maximum allowed size for an ADU is 1,200 square feet or 50% of the primary dwelling’s living area, whichever is less. This provides homeowners with the freedom to create a spacious and comfortable ADU that meets their needs and enhances their property’s value.
  • Duplex house: Duplex family zoned lots in San Carlos allow for slightly larger ADUs compared to single-family lots. The maximum allowed size for an ADU on a duplex family zoned lot is 1,500 square feet or 50% of the primary dwelling’s living area, whichever is less, offering more flexibility in design and layout.
  • Multi-Family Mix: Multi-family zoned lots in San Carlos offer the most generous size allowances for ADUs. The maximum allowed size for an ADU on a multi-family zoned lot is 1,800 square feet or 50% of the primary dwelling’s living area, whichever is less, enabling the creation of larger, more versatile ADUs that cater to diverse needs.

Fire Safety Regulations

Ensuring fire safety is a top priority when building an ADU in San Carlos. ADUs must comply with local fire safety regulations, which may include requirements for fire-resistant materials, smoke detectors, carbon monoxide alarms, and adequate egress. Consulting with a professional can help ensure that your ADU meets all fire safety standards.

Parking

San Carlos has specific parking requirements for ADUs, which vary based on the unit’s size, location, and proximity to public transit. In some cases, no additional parking may be required, while in others, one or more off-street parking spaces may be necessary. Understanding these parking requirements is crucial for planning your ADU project.

Utility Connections

When building an ADU in San Carlos, it’s essential to consider utility connections such as water, sewer, electricity, and gas. ADUs may be able to connect to the primary dwelling’s existing utility lines, or they may require separate connections. Working with a professional can help ensure that your ADU’s utility connections are properly planned and executed.

Setbacks

Setbacks are the minimum distances required between your ADU and property lines, as well as other structures on the lot. In San Carlos, setback requirements for ADUs vary based on the zoning of the property and whether the ADU is attached or detached. Adhering to these setback requirements is crucial for maintaining a harmonious relationship with neighboring properties.

Zoning Regulations

Understanding the zoning regulations in San Carlos is essential for planning your ADU project. Zoning regulations dictate the allowed uses, size, height, and placement of structures on a property. Single-family, duplex family, and multi-family zoned lots have different zoning regulations that impact ADU construction. Familiarizing yourself with these regulations is key to a successful ADU project.

San Jose ADU Zoning Regulations

Single Family

Single-family zoned lots in San Carlos are designated for detached single-family homes. ADUs on these lots must comply with specific size, height, and setback requirements to maintain the character of the neighborhood. It’s important to review the zoning regulations for your specific single-family zoned lot before starting your ADU project.

Duplex Family

Duplex family zoned lots in San Carlos allow for two attached or detached dwelling units on a single lot. ADUs on these lots have slightly more generous size and height allowances compared to single-family zoned lots. However, it’s crucial to review the specific zoning regulations for your duplex family zoned lot to ensure compliance.

Multi-Family

Multi-family zoned lots in San Carlos are designed to accommodate multiple dwelling units, such as apartments or condominiums. ADUs on these lots have the most generous size and height allowances, but they must still comply with specific zoning regulations. Reviewing the zoning regulations for your multi-family zoned lot is essential for planning a compliant ADU project.

RF Zone Minimum Lot Area In San Carlos

In San Carlos RF Zone, minimum lot sizes range from spacious single-family homes (RF-20) to sprawling estate properties (RF-40), ensuring ample space for your ADU and lifestyle.

  • RF-20 (30 words): The RF-20 zone in San Carlos requires a minimum lot size of 20,000 square feet, providing ample space for a single-family home and an ADU, while maintaining a spacious and open feel.
  • RF-30 (30 words): San Carlos’s RF-30 zone requires a minimum lot size of 30,000 square feet, offering even more space for a primary dwelling and an ADU, along with generous outdoor living areas.
  • RF-40 (30 words): The RF-40 zone in San Carlos mandates a minimum lot size of 40,000 square feet, allowing for expansive estate properties with ample room for a primary dwelling, an ADU, and luxurious amenities.

Room Specifications

When designing your ADU in San Carlos, it’s important to consider the specifications for each room to ensure that your unit is functional, comfortable, and compliant with local regulations. Room specifications may include minimum sizes, required amenities, and safety features. Carefully planning each room’s specifications will help create a successful and livable ADU.

San Jose ADU Room Specifications

Room TypeSpecifications
Bathroom– Minimum size: 25 sq. ft.
– Ventilation required
– Water-resistant flooring
– Moisture-resistant walls
– GFCI outlets
Kitchen– Minimum size: 50 sq. ft.
– Sink with hot and cold water
– Cooking appliance
– Refrigerator
– Counter space
Sleeping Areas– Minimum size: 70 sq. ft.
– Egress window or door
– Minimum ceiling height: 7 ft.
– Heating source
– Smoke detector
Storage– Adequate storage space
– Easily accessible
– Proper ventilation
– Moisture-resistant materials
– Secure and safe

San Carlos Requirements

Building an ADU in San Carlos involves meeting specific requirements based on the type of ADU you plan to construct. Whether you opt for a detached ADU, an attached ADU, or a JADU, each type has its own set of requirements that must be followed to ensure a compliant and successful project.

Detached ADU San Carlos: Detached ADUs in San Carlos are standalone structures, separate from the primary dwelling. They must adhere to specific size, height, and setback requirements based on the property’s zoning. Detached ADUs also require separate utility connections and must meet all applicable building codes and safety regulations.

Attached ADU San Carlos : Attached ADUs in San Carlos are physically connected to the primary dwelling and share a common wall. They are subject to the same size and height restrictions as detached ADUs, based on the property’s zoning. Attached ADUs may be able to share utility connections with the primary dwelling, streamlining the construction process.

JADU San Carlos: JADUs (Junior Accessory Dwelling Units) in San Carlos are smaller living spaces created within the existing footprint of a single-family home. They have a maximum size of 500 square feet and must include a kitchenette and an entrance separate from the primary dwelling. JADUs may share utility connections with the main house.

Rental Requirements

If you plan to rent out your ADU in San Carlos, it’s important to understand the rental requirements. These requirements help ensure that your ADU is safe, habitable, and compliant with local regulations. As a landlord, you’ll need to adhere to specific guidelines and provide necessary documentation to potential tenants.

  • Proof of income: Landlords in San Carlos may require proof of income from prospective tenants to ensure they can afford the rent. This may include pay stubs, tax returns, or bank statements.
  • Credit score: A good credit score is often a requirement for renting an ADU in San Carlos. Landlords may set a minimum credit score threshold to assess a tenant’s financial responsibility.
  • Rental history: Landlords may request rental history from prospective tenants to gauge their reliability as renters. This may include references from previous landlords and information about past rental experiences.
  • Application fee: Some landlords in San Carlos may charge an application fee to cover the costs of background checks and credit reports. These fees are generally non-refundable and vary in amount.
  • Security deposit: Most landlords in San Carlos require a security deposit from tenants before moving in. This deposit protects the landlord against potential damages and is typically refundable upon move-out.
  • Proof of renter’s insurance: Landlords may require tenants to provide proof of renter’s insurance before moving into an ADU. This insurance protects the tenant’s belongings and provides liability coverage for the renter.
  • Pet policy: San Carlos landlords may have specific pet policies for their ADUs. Some may allow pets with an additional deposit, while others may prohibit pets entirely. Reviewing the pet policy before renting is crucial.
  • Smoking policy: Smoking policies for ADUs in San Carlos vary by landlord. Some may allow smoking inside the unit, while others may designate outdoor smoking areas or prohibit smoking entirely.

Development Standards For San Carlos ADU

ADU development standards in San Carlos ensure that these units are built safely, efficiently, and in harmony with the surrounding neighborhood. These standards cover aspects such as size, height, setbacks, and parking requirements, which vary depending on the type of ADU and the zoning of the property.

ADU TypesDevelopment Standards Specifications
Single-family– Maximum size: 1,200 sq. ft. or 50% of primary dwelling
– Maximum height: 16 ft. (detached)
– Setbacks: Vary by zoning
– Parking: Varies by size and location
– Design: Compatible with primary dwelling
Duplex– Maximum size: 1,500 sq. ft. or 50% of primary dwelling
– Maximum height: 18 ft. (detached)
– Setbacks: Vary by zoning
– Parking: Varies by size and location
– Design: Compatible with primary dwelling
Multi-family– Maximum size: 1,800 sq. ft. or 50% of primary dwelling
– Maximum height: 20 ft. (detached)
– Setbacks: Vary by zoning
– Parking: Varies by size and location
– Design: Compatible with primary dwelling
Junior ADUs (JADUs)– Maximum size: 500 sq. ft.
– Contained within primary dwelling
– Kitchenette required
– Separate entrance required
– Parking: No additional parking required

San Carlos Property Designations For ADU

When planning your ADU project in San Carlos, it’s crucial to consider property designations that may impact the construction and placement of your unit. These designations include flood zones, geohazard zones, and easements, which can influence the design, permitting, and construction process of your ADU.

  • Flood zones: Some areas in San Carlos may be designated as flood zones, which require special construction techniques and materials to mitigate potential flood damage. Consulting with a professional can help ensure compliance.
  • Geohazard zones: San Carlos has areas designated as geohazard zones, which may be prone to landslides, earthquakes, or other geological hazards. Special engineering and design considerations may be necessary for ADUs in these zones.
  • Easements: Easements on a property in San Carlos may limit the placement and construction of an ADU. It’s essential to review any easements on your property before planning your ADU project.

ADU Permit Requirements And Fees

Building an ADU in San Carlos involves obtaining the necessary permits and paying associated fees. These requirements ensure that your ADU is constructed safely, legally, and in compliance with local regulations. Understanding the permit requirements and fees is essential for planning your budget and timeline for your ADU project.

San Jose ADU Permit Requirements and Fees

  • Building Permit: A building permit is required for all ADU projects in San Carlos. This permit ensures that your ADU meets local building codes and safety standards. Fees vary based on the project’s scope.
  • Electrical Permit: An electrical permit is necessary for any electrical work associated with your ADU project in San Carlos. This permit ensures that the electrical installations are safe and compliant with local codes.
  • Plumbing Permit: If your ADU project involves plumbing work, a plumbing permit is required in San Carlos. This permit guarantees that the plumbing installations meet local codes and safety standards.
  • Other Permits: Depending on the specifics of your ADU project in San Carlos, other permits may be required, such as mechanical permits, grading permits, or tree removal permits. Consulting with a professional can help identify necessary permits.

Design Your Dream ADU Today!

With a clear understanding of San Carlos ADU zoning and building standards, you’re well-equipped to design the ADU of your dreams. Whether you’re looking to create additional living space, generate rental income, or accommodate multigenerational living, an ADU can provide the perfect solution. Start designing your dream ADU today and unlock the full potential of your San Carlos property!

FAQ’s

Yes, but specific setbacks and design considerations apply. Contact the Woodside Planning Department for detailed guidance on navigating unique lot shapes.

Some lenders offer ADU loans, but traditional home loans can also be used for ADU construction, especially if they add value to your property.

Yes! The State of California offers various ADU incentive programs, including grants for low-income homeowners and developers. Research state and local programs to see if you qualify for financial assistance.

Related Articles to San Carlos