AB 462 is a California law, effective October 10, 2025, that requires coastal-zone ADU permit applications to be approved or denied within 60 days. That's down from the 6 to 18 months coastal ADU permits routinely took before. For homeowners in coastal North County San Diego, it removes the single biggest delay in building an ADU.
If you shelved an ADU a few years ago because the coastal permit process felt like it might outlast your patience, that math just changed. The catch is that the 60-day clock covers less than most homeowners assume, and you only get the benefit of it if your application is complete and correct the first time.
What Is AB 462?
AB 462 is a California Assembly bill that took effect on October 10, 2025, the day the Governor signed it, because it was written as an urgency statute. It sets a hard 60-day deadline for local agencies to act on ADU permit applications for properties in the coastal zone. You can read the full bill text on the California Legislature's website if you want the legal language.
Why did coastal properties need their own bill? California has been tightening ADU approval timelines statewide for years, but coastal properties were the stubborn exception. Land in the coastal zone falls under the Coastal Act, which adds a separate layer of review on top of the standard building permit process. That extra layer is why a homeowner in Solana Beach could wait a year for approval while a homeowner a few miles inland got an answer in weeks.
AB 462 closes that gap. If your property's in the coastal zone and you submit a complete ADU application, the reviewing agency now has 60 days to approve it or deny it. Not 60 days to send you a first round of comments. Sixty days to act.
What Did AB 462 Change for Coastal ADU Permits?
One number replaced another.
- Before AB 462: coastal ADU permit approvals historically took 6 to 18 months. The coastal review process had no meaningful deadline, so applications could sit, cycle through comment rounds, and stall behind other projects. Plenty of homeowners in coastal North County shelved ADU plans over that uncertainty alone.
- After AB 462: coastal-zone ADU permit approval is capped at 60 days.
That's not a minor procedural tweak. It takes the least predictable phase of a coastal ADU project, the one homeowners had zero control over, and puts a ceiling on it.
One catch, and it's a big one: the 60-day clock runs from a complete application. If your submittal's missing documents, drawings, or required details, the clock doesn't work in your favor. The agency can bounce an incomplete application back, and every resubmittal cycle adds weeks or months you didn't plan for. The law caps review time. It doesn't fix a sloppy application.
Who Qualifies? Coastal Zone Properties
AB 462 applies to ADU applications for properties in California's coastal zone. The coastal zone is a mapped band of land along the state's coastline established under the Coastal Act, and it's not the same as "near the beach." In some areas it runs well inland. In others it's a narrow strip.
In coastal North County San Diego, large portions of Solana Beach, Del Mar, Encinitas, Cardiff, Carlsbad, and La Jolla sit inside the coastal zone. Whether your specific parcel qualifies depends on the boundary in your city, and that's a property-by-property question. It's one of the first things worth confirming before you plan an ADU, because it determines which review process, and now which deadline, applies to you. Cities also implement new state rules at slightly different speeds, so it's worth a call to your planning department to confirm how they're handling AB 462 right now.
If your property's outside the coastal zone, AB 462 doesn't apply to you, but that's generally good news. Non-coastal ADU applications in California were already subject to a 60-day review requirement under existing state ADU law. AB 462 essentially brings coastal properties up to the same standard.
What Does the 60-Day Clock Actually Cover?
This is where homeowners most often get the wrong picture. The 60-day cap applies to permit review. That's it. It doesn't cover the work that happens before you submit or after you're approved.
The 60-day clock covers the reviewing agency's decision on your complete ADU permit application: approve or deny, within 60 days. It does not cover:
- Design. Site analysis, floor plans, elevations, structural drawings, Title 24 energy documentation, and everything else that goes into a submittal package. Depending on the ADU and the site, design and documentation take months, not days.
- Pre-submittal work. Confirming coastal zone status, setbacks, utility connections, and site constraints before drawings begin.
- Resubmittals. If the application's incomplete or drawings conflict with code, corrections and resubmittal cycles happen outside the 60-day window and stretch the overall timeline.
- Construction. Building the ADU is its own multi-month phase after the permit is issued.
What Does This Mean for Your Real ADU Timeline?
A coastal ADU project has three broad phases: design and documentation, permit review, and construction.
Under the old rules, permit review could be the longest phase of the entire project. You could finish design in a few months, then wait a year for coastal approval, then build. The permit phase dominated everything.
Under AB 462, permit review becomes the shortest phase, provided the application's complete. Design and construction are now the timeline drivers, and both of those are phases you can actually manage through good planning and a disciplined team.
So where does that leave you? The state fixed its side of the timeline. Your side, the design and documentation side, is now what determines whether your coastal ADU moves fast or slow. A clean, complete application gets a decision inside 60 days. A weak one triggers correction cycles that quietly rebuild the old delays the law was written to eliminate.
AB 462 in Coastal North County: Solana Beach, Del Mar, Encinitas, and Beyond
We work across coastal North County San Diego from our studio in the Cedros Design District in Solana Beach, and AB 462 lands differently depending on where you are.
- Solana Beach. Much of the city sits inside the coastal zone, which historically made ADU approvals here slower than in inland communities. Solana Beach properties are among the clearest beneficiaries of the 60-day cap.
- Del Mar. A small coastal city where coastal review has long shaped what and how homeowners build. AB 462 puts a firm deadline on ADU decisions for coastal-zone parcels here.
- Encinitas and Cardiff. Encinitas, including Cardiff, has significant coastal-zone acreage west of I-5 and in pockets beyond it. If you assumed a coastal ADU permit here meant a year of waiting, that assumption's out of date.
- Carlsbad. Carlsbad's coastal zone covers a meaningful share of the city's western neighborhoods. ADU applications on those parcels now fall under the 60-day requirement.
- La Jolla. As part of the City of San Diego's coastal area, La Jolla saw some of the longest ADU approval timelines in the county. The 60-day cap applies to coastal-zone parcels here as well.
- Rancho Santa Fe. Most of Rancho Santa Fe sits inland of the coastal zone, so ADU applications here were already outside the coastal review process. AB 462 changes little for most RSF properties, but ADUs remain a strong option on the community's larger lots.
How a Design-Build Process Avoids Resubmittal Cycles
The 60-day cap rewards one thing above all: a complete, internally consistent application. That's exactly what a design-build process is set up to produce.
In a traditional setup, you hire a designer, take the drawings to a contractor, and find out where the two don't line up. Those gaps surface either at plan check, where they trigger corrections, or during construction, where they trigger change orders. Either way, the timeline stretches.
At Elevations Design Build (CSLB #1142324), our process runs design and construction under one roof, working with partnered licensed architects. The project starts with a paid Design Phase contract, where we work through the site constraints, coastal-zone requirements, structural approach, and full documentation before anything gets submitted. Because the people who'll build the ADU are involved while it's being designed, buildability questions get answered on paper instead of in plan-check comments. When the design's locked, the Construction Contract is built directly off that scope. No handoff gap between the drawings and the build, which is where most resubmittal problems are born.
For a coastal ADU under AB 462, that structure matters more than it ever has. The law gives you a 60-day decision on a complete application. Our job in the Design Phase is making sure the application's complete the first time, so the clock works for you instead of against you. If you're weighing an ADU against other ways to add space, our ADU design and construction and home additions pages break down how we approach each.
Frequently Asked Questions
What is AB 462 in California?
AB 462 is a California law, effective October 10, 2025, that caps permit approval for ADUs in the coastal zone at 60 days. Before the law, coastal ADU permits historically took 6 to 18 months. The full bill text is available on the California Legislature's website. It applies to ADU applications on properties within the mapped coastal zone.
How long does a coastal ADU permit take in San Diego now?
Under AB 462, the reviewing agency must approve or deny a complete coastal-zone ADU application within 60 days. That's the permit review phase only. Design and documentation happen before submittal, and construction happens after approval, so the total project runs longer than 60 days. The permit itself, though, is no longer the bottleneck it was.
Does the 60-day rule include design and construction time?
No. The 60-day cap covers only the agency's review of a complete permit application. Designing the ADU, producing construction drawings, and preparing the submittal package all happen before the clock starts. Building the ADU happens after the permit is issued. AB 462 compresses the review phase, but the overall project timeline still depends on design quality and construction scheduling.
How do I know if my property is in the coastal zone?
The coastal zone is a mapped boundary under the California Coastal Act, and it doesn't follow a simple distance-from-the-beach rule. In coastal North County, large parts of Solana Beach, Del Mar, Encinitas, Cardiff, Carlsbad, and La Jolla fall inside it. Confirming your parcel's status is a standard early step in our Design Phase, since it determines which review process applies.
What happens if my ADU application is incomplete?
An incomplete application doesn't get the benefit of the 60-day clock. The agency can return it for corrections, and each resubmittal cycle adds weeks or months. That's why the quality of the submittal package now matters more than anything else in the timeline. A design-build team that produces complete, coordinated drawings the first time protects the speed AB 462 was written to deliver.
Ready to Move on a Coastal ADU?
If you own a coastal-zone property in Solana Beach, Del Mar, Encinitas, Cardiff, Carlsbad, or La Jolla and an ADU is back on the table, the next step is a $250 on-site design consultation with our principal, credited in full to your project. We'll walk the site, confirm what applies to your parcel, and give you a straight read on scope and timeline. Contact us or call (760) 407-4753.