How to Get an ADU Permit in Santa Rosa
📋 Key ADU Regulations in Santa Rosa
Before embarking on your ADU project, familiarize yourself with Santa Rosa's regulations:
Zoning Requirements: ADUs are permitted on single-family and multi-family zoned properties, subject to City regulations.
Unit Limits: Single-family properties can add one ADU and one Junior ADU (JADU). Multi-family properties may add two detached ADUs and at least one conversion ADU.
Size Limits: ADUs can range from 150 to 1,200 square feet, depending on the type and zoning.
Setbacks: Detached ADUs must maintain a minimum of four feet from side and rear property lines.
Height: ADUs should not exceed the height of the primary dwelling unit.
Parking: One off-street parking space is required per ADU unless the unit is a conversion or located within half a mile of public transit.
🛠️ ADU Express: A Streamlined Approval Process
Santa Rosa offers the ADU Express program, which expedites the ADU approval process:
Eligibility: Determine if your property qualifies by using the ADU Express Eligibility Tool.
Select a Plan: Choose from pre-approved ADU plans available in the ADU Pre-Approved Plan Catalogue.
Obtain a Meter Spot: Contact Santa Rosa Public Utilities to schedule a free "meter spot" for your ADU.
Submit Plans: Provide the meter spot report and selected plan number to Santa Rosa Planning and Building staff.
Site Plan Review: Meet with city staff to create your site plan and review construction requirements.
💰 How Much Does an ADU Permit Cost in Santa Rosa?
| Permit Type | Description | Estimated Cost |
| Building Permit | Required for ADU construction; varies based on project size and complexity. | $1,000 – $10,000+ |
| Planning Application Fee | Fees to address the impact of new development on public infrastructure. | Varies; contact Planning Division for current rates |
| Development Impact Fees | Fees to address the impact of new development on public infrastructure. | Varies; contact Planning Division for current rates |
| Utility Connection Fees | Costs for connecting water, sewer, and electricity services to the ADU. | Varies; typically between $3,000 and $10,000 |
| Design & Engineering Fees | Professional fees for designing and planning the ADU. | $8,000 – $20,000 |
| Site Development Permit | For site planning related to the ADU. | $300 – $500 |
| Permit Processing Fees | Administrative fees added to each plan check and permit application. | Varies; contact Planning Division for current rates |
✅ Benefits of Building a Permitted ADU in Santa Rosa
Opting for a permitted ADU offers several advantages:
Legal Compliance: Avoid fines and penalties associated with unpermitted structures.
Increased Property Value: ADUs can significantly boost your property's resale value.
Access to Financing: Easier to secure loans for permitted ADUs.
Peace of Mind: Ensure safety and quality through inspections and adherence to building codes.
