So, you’re ready to build an Accessory Dwelling Unit (ADU) in California. You’ve got your ideas scribbled on a notepad, your Pinterest boards filled with design inspiration, and a vision of what that cozy backyard oasis (or stylish garage conversion) might look like. There’s just one tiny little detail standing in your way: permits. Cue the dramatic music.
But don’t worry—getting your ADU permitted in the Golden State isn’t as daunting as it may seem. With recent pro-ADU legislation, streamlined processes, and a bit of insider know-how, you can move through this phase with confidence. Let’s break down the process into easy steps so you’ll know exactly what to expect, how to prepare, and when to pop that celebratory sparkling water (or something stronger, we won’t judge).
Why California’s ADU Permit Process Isn’t as Scary as You Think
In the last few years, California has rolled out a series of ADU-friendly laws to address the state’s housing shortage (California Department of Housing and Community Development [HCD], n.d.). These laws limit local restrictions, reduce parking requirements, and often fast-track permits compared to a full-sized home build. In other words, policymakers are actually on your side.
Key Takeaway: Building an ADU today is easier than it was five years ago. That’s good news for you—and your future tenants, in-laws, or home office setup.
Step 1: Know the Basics of Statewide ADU Laws
California’s ADU laws set a baseline standard across all cities and counties. These rules cover:
- Minimum Lot Size Requirements: In many cases, there isn’t a strict minimum lot size anymore.
- ADU Size Limits: Generally, you can build up to at least 800 square feet, often more depending on local rules.
- Parking Requirements: Many areas waive additional parking requirements if your ADU is near transit or within certain urban areas.
- Setbacks: Rear and side setbacks are often just four feet, a big improvement from more restrictive residential zoning laws of the past.
Start by visiting the HCD’s ADU webpage for a high-level overview. This will give you a solid foundation before diving into local specifics.
Step 2: Check Local Regulations
Even with statewide laws, each city can still tweak the details. For instance, San Diego’s ADU guidelines might differ slightly from those in Los Angeles or San Francisco. Localities can set size caps, aesthetic guidelines, or additional provisions related to historic districts or certain neighborhoods.
Pro Tips:
- Visit Your City’s Planning Department Website: Most cities now have clear ADU pages or downloadable guides.
- Contact a Planner: Don’t be shy about calling or emailing. Planners often appreciate proactive homeowners who ask questions before submitting plans.
- Seek Out Examples: Got a friend or neighbor who recently built an ADU? Pick their brain—they’ve been through the process and survived to tell the tale.
Step 3: Get Your Plans in Order
Before you can submit your permit application, you’ll need a set of plans that meet both state and local requirements. This usually involves working with an architect or designer who knows the ADU game inside and out.
What Your Plans Should Include:
- Site Plan: Show where the ADU sits on your lot, along with property lines, existing structures, and utilities.
- Floor Plans & Elevations: These detail room layouts, exterior look, and dimensions.
- Structural & Mechanical Details: Prove that your little ADU can stand tall (and safely) with proper framing, electrical, plumbing, and HVAC systems.
Consider hiring an owner’s representative (like us at ADU Advocate) who can ensure your plans are code-compliant before you even set foot in City Hall. Fewer revisions = faster approvals.
Step 4: Submit Your Application
Think of your permit application like a well-prepared dinner party menu—you want everything ready to serve so your guests (in this case, city reviewers) leave satisfied.
A Typical Application Includes:
- Completed permit application forms
- Plans and drawings (digital and/or printed, depending on local rules)
- Applicable fees (plan check fees, permit fees)
- Proof of property ownership
Once submitted, the city’s building department and planning staff will review your plans. Don’t panic if they come back with comments—it’s normal. Consider it constructive feedback to ensure your ADU meets all standards.
Step 5: Address Plan Check Comments
Plan check comments might feel like a bummer, but they’re really just the city’s way of saying, “Great start, but let’s tighten a few screws.” Typical comments might involve:
- Clarifying certain construction details
- Adjusting window placements for code compliance
- Adding or removing certain design elements to meet setback or design guidelines
Take these comments to your architect or project manager. The sooner you make revisions, the sooner you’ll have that shiny permit in hand.
Step 6: Get the Green Light and Start Building
Once the city approves your plans, congratulations—you’ve got your permit! Now it’s time to move forward with construction. Throughout the build, you’ll likely need a few inspections—foundation, framing, electrical, plumbing, and a final inspection, at minimum.
Inspections Made Easy:
- Schedule them ahead of time—cities often have online portals or hotlines for booking inspections.
- Make sure the relevant work is complete and accessible for the inspector.
- Keep a record of all inspection reports in case you need them for final approvals.
After your final inspection is signed off, you’re good to go. Your ADU is now legally ready for occupancy, and you can start enjoying the benefits of your new space.
Bonus Tips for a Smooth Permit Process
- Hire Pros Who Know ADUs: Work with architects, designers, and contractors experienced in ADU construction. They’ll anticipate pitfalls and help you avoid them.
- Stay Organized: Keep all documents—plans, permits, inspection reports—neatly filed (digitally and physically).
- Be Patient and Proactive: Don’t wait for the city to contact you if you suspect something’s amiss. Politely follow up and stay involved in the process.
Wrapping It Up
Navigating the ADU permit process in California is more straightforward than it once was, thanks to supportive legislation and clearer guidelines. By understanding the rules, preparing solid plans, and collaborating with experienced professionals, you can sail through the permitting process and get one step closer to enjoying your new ADU.
Ready to get started? Visit ADUAdvocate.com for personalized guidance, resources, and tips to make your ADU journey as smooth as that first sip of a perfectly brewed morning coffee.
References
California Department of Housing and Community Development (HCD). (n.d.). Accessory Dwelling Units (ADUs). Retrieved from https://www.hcd.ca.gov/californias-housing-laws/accessory-dwelling-unitsCity of San Diego. (n.d.). Accessory Dwelling Units. Retrieved from https://www.sandiego.gov/development-services/permits/adu