Building an Accessory Dwelling Unit (ADU) in Santa Cruz County has become an increasingly popular way for homeowners to add value to their properties, create additional living spaces, or generate rental income. However, navigating the local regulations and permitting processes is crucial to ensure a successful project. This guide provides an overview of the current ADU regulations in Santa Cruz County as of 2025, helping you understand the steps and considerations involved.
Understanding ADUs in Santa Cruz County
An Accessory Dwelling Unit (ADU) is a secondary housing unit on a single-family residential lot. These units can be detached, attached, or converted from existing spaces like garages or basements. Santa Cruz County encourages the development of ADUs to address housing shortages and provide flexible living arrangements.
Eligibility Criteria for Building an ADU
Before planning your ADU, it’s essential to determine if your property meets the eligibility requirements:
- Zoning Requirements: ADUs are permitted on parcels where the zoning district or General Plan allows residential uses, and there is an existing or proposed primary dwelling.
- Lot Size and Coverage: While there isn’t a minimum lot size specified, the size of the ADU must comply with lot coverage and floor area ratio standards. Importantly, local agencies cannot establish maximum sizes that prevent at least an 800-square-foot ADU with four-foot side and rear yard setbacks.
- Setback Requirements: ADUs must adhere to setback requirements, including a minimum of four-foot side and rear yard setbacks.
Permitting Process
Santa Cruz County has streamlined the permitting process for ADUs:
- Application Submission: Most ADUs require only a building permit, which can be submitted through the County’s online ePlan review process.
- Review Period: The County is mandated to review and respond to ADU applications within 60 days of submittal.
- Design and Zoning Compliance: Ensure your ADU plans comply with design guidelines and zoning requirements, including architectural style, exterior finish, and neighborhood compatibility.
- Fees and Costs: Be prepared for associated fees, which may include impact fees, building permit fees, and utility connection fees.
Owner Occupancy Requirements
As of January 1, 2025, Santa Cruz County requires that the property owner or an immediate family member occupy either the primary residence or the ADU as their principal place of residence.Â
Short-Term Rental Restrictions
Properties with ADUs are prohibited from participating in the County’s Vacation Rental or Hosted Rental programs, meaning short-term rentals (less than 30 days) are not allowed.Â
Financial Incentives
Santa Cruz County offers financial incentives to encourage the development of ADUs:
- Forgivable Loan Program: Provides forgivable loans up to $40,000 to homeowners who rent ADUs to low-income households at affordable rents for up to 20 years.Â
Conclusion
Building an ADU in Santa Cruz County is a viable way to enhance your property’s value and contribute to the local housing supply. Understanding and adhering to the current regulations and permitting processes are crucial steps toward a successful project. For comprehensive guidance on Santa Cruz ADU regulations, visit OCA Builders: ADU ConstructionÂ
By staying informed and working with experienced professionals, you can navigate the process smoothly and create a valuable addition to your property.
