ADUs, or granny flats as some folks like to call them, are all the rage in California these days. Thanks to some changes in the law and a bunch of grants and loans popping up, putting up one of these bad boys in your backyard is easier than ever. But, let me tell you, figuring out the whole permit thing can still be a bit of a headache, especially if zoning codes and building rules aren’t your cup of tea.
From what I’ve seen, getting your ADU permit ducks in a row from the start is super important for keeping your project from turning into a money-eating monster. Take it from me, I’ve seen people get tangled up in red tape. Like this one client in San Diego County, who didn’t get the memo about the local zoning laws. They ended up having to redo their whole plan, which cost them time and cash. It was a real eye-opener about doing your homework first.
Now, depending on where you are in California, getting your hands on an ADU permit can take anywhere from a quick month to a long six months, according to some industry report I came across. The trick to not getting bogged down? Team up with someone who knows the local scene inside and out.
In this piece, I’m going to spill the beans on how to deal with the ADU permit maze in California, from figuring out the 60-day rule to making sure you actually get that permit. Hooking up with the right pros can make a world of difference in keeping your ADU project smooth sailing and drama-free.

Download FREE ADU Guidebook
The ADU Guidebook will give you full information on all steps of a successful ADU development.
1 Getting Ready for Your ADU Permit: Keep It Real
Let’s talk about setting up for the ADU permit hustle. A lot of folks dive into this without realizing it’s not just a hop, skip, and a jump. Honestly, this part can either make your project fly or flop, timeline-wise.
Here’s the deal from what I’ve seen: pulling together all the docs and making sure your ADU doesn’t step on any legal toes can stretch from a few weeks to a few months. It really depends on how complicated your plans are and what your local building office asks for.
My go-to advice? Dig into your county’s zoning rules ASAP. These rules are the big bosses of your ADU game, dictating stuff like how big you can go, where it can sit on your property, and the parking puzzle. If you don’t play by these rules, you’re basically asking for your permit to get the thumbs down.
Teaming up with a local ADU wizard is a game-changer. These folks eat, sleep, and breathe zoning laws and building codes, so they can help you dodge any regulation landmines and get your plans in tip-top shape before they even hit the permit office’s desk.
Don’t forget about rounding up all your paperwork, like floor plans that show every nook and cranny, where your ADU is going to sit on your land, and all the nitty-gritty structural details. These bits and pieces prove your project isn’t going to fall over in the next stiff breeze and follows all the rules.
Take it from a project we had: we hunkered down with our client for a few good weeks, dotting the i’s and crossing the t’s on all our documents. Because we put in the elbow grease early, our permit sailed through without a hitch, saving our client a heap of stress and cash. That’s the kind of smooth sailing you want for your ADU project.
2 Handing in Your ADU Permit Application: Keep Cool and Carry On
Alright, so you’ve got your mountain of documents ready and your plans are all cozy with the local ADU rules and regulations. Now it’s showtime: submitting your permit application. This step might seem a bit scary, but with some solid prep and an eye for the details, you can dodge the speed bumps.
Here’s a pro tip from the trenches: Make sure you’re using the right forms from your local building folks. Every area’s got its own little quirks, so sticking to their playbook is key.
When you’re filling out those forms, be as clear and complete as a summer day is long. Even tiny mix-ups or missing bits can throw a wrench in the works, slowing everything down.
I always tell my clients, “Check it once, then check it again.” You want to make sure you’ve got everything buttoned up tight. And don’t forget to square away the fees right off the bat to keep things moving smoothly.
I’ve got a story for you: Once, a client of mine left out a crucial detail on their application. It was like missing a piece in a puzzle. We ended up in a two-week holding pattern just to slot that piece back in. It was a real lesson in dotting your i’s and crossing your t’s.
And let’s not overlook the importance of your supporting docs, like your site plans and the nuts-and-bolts structural drawings. The more detailed and on-point these are, the smoother your review process will be.
I like to team up with architects and engineers to make sure we’re not missing anything and that everything’s up to code. A well-put-together application packet doesn’t just look good; it shows you mean business and can help you zip through the review process.
At the end of the day, nailing your permit application is all about being thorough, double-checking your work, and getting a little help from your friends in the know. Stick to these principles, and you’ll be setting the stage for a successful ADU project.
So, you’ve sent off your ADU permit application and now the ball is in your local building department’s court. They’ll be doing a deep dive into your plans, checking that everything’s up to snuff with zoning rules, building codes, and safety musts. Having been through this rodeo for over 20 years, I can tell you this is when projects often hit a snag or two. Something as small as a mismatch in paperwork can throw a wrench into the works, leading to hold-ups or, worse, a no-go.
A classic hiccup happens when ADU designs don’t quite gel with the local zoning playbook—think issues with how far your ADU is from your property line or how tall it is. Sorting these out can mean going back to the drawing board, which nobody wants.
Then there’s the building code beast. If your plans aren’t up to par on things like structure strength or fire safety, you might have to tweak your design with your architect or engineer to get everything just right.
My best advice? Get a seasoned ADU pro on your team. Someone who knows the ins and outs of local regulations can spot potential trouble spots early and help steer clear of them.
During this review phase, don’t be surprised if inspectors decide to check out your property to see if what’s on paper matches the real deal. Keeping an open line of communication with these folks and addressing their feedback swiftly can really smooth things out.
And it doesn’t end with the building department. Sometimes, you’ll need nods from other city departments, like water and power. Being on the ball and giving them what they need without delay can keep your ADU dream from getting bogged down.
In a nutshell, the secret sauce for getting through the review process is being prepared, working with folks who know their stuff, and being ready to pivot if needed. Staying proactive and responsive can make all the difference in keeping your ADU journey on the straight and narrow.
4 The Final Hurdle: Getting Your ADU Permit
When your ADU plans pass muster and get all the thumbs-ups they need, you’re almost there. This is where the local building crew does one last check-up to make sure everything’s tickety-boo with your application. If the coast is clear, they’ll hand over your ADU permits, and it’s like getting the all-clear to start digging. Pop the champagne because it’s a big win—but hold your horses; there’s more to do before you dive into construction.
Here’s the deal: You’ve got to keep those permits in your hot little hands before you even think about starting work. I’ve seen too many folks get ahead of themselves, kicking off construction without the official go-ahead, and oh boy, does that backfire. Picture having to knock down your nearly finished ADU because it was all for nothing—yep, it happens, and it’s as fun as a bucket of cold water to the face.
So, here’s what you do: Take a chill pill and wait for those permits. Use the time wisely—get your ducks in a row, talk to contractors, and stack up your materials. That way, when the green light comes, you’re off to the races without a hitch.
And don’t forget about the inspections. Throughout your build, the building department’s going to pop in to make sure everything’s up to code—foundation, framing, you name it. Staying in sync with your contractor and any ADU pros you’re working with to make sure your build’s inspection-ready can save you from headaches and hold-ups.
In the grand scheme of things, getting your ADU from dream to reality is about patience, sweating the small stuff, and teaming up with the right folks who’ve been down this road before. Keeping your eye on the prize and being ready to tackle the work head-on can turn your ADU dreams into solid, livable (and legal) reality.
The 60-Day Rule Makeover: A Fresh Take on ADU Permits in California
Let’s chat about the 60-day rule in California’s ADU scene—a policy with its heart in the right place, aiming to speed up the whole permit process and get more ADUs popping up around the state. The idea was simple: make it quicker and less of a headache for folks to add these affordable homes to the housing mix. But, as with all good plans, there were a few bumps along the way.
Back in 2020, the rule said that local building crews had to give a thumbs up or thumbs down to ADU permit applications within 60 days after they landed on their desks. It was all about putting the pedal to the metal to help ease the housing crunch. Sounds great, right? Well, the reality was a bit of a mixed bag. Cities and counties were swamped with applications, leading to a logjam of projects waiting for a look-over. In some spots, if the clock ran out, applications got the boot without much chance to fix any small issues or missing bits of info.
I’ve been in the trenches with homeowners through this process, and I’ve seen the frustration when a project gets nixed at the last minute over something minor. Picture this: one of my clients got a “no-go” on day 59 because of a tiny paperwork slip-up. Talk about a heartbreaker—they had to go back to square one.
Thankfully, the folks in charge caught onto these snags and introduced AB 221 in 2021, thanks to Governor Newsom’s signature. This tweak to the 60-day rule meant that instead of just getting a flat-out “no,” cities and counties had to spell out exactly what was wrong with the application. It pushed local building departments to actually dig into the details and collaborate with homeowners to get things right, rather than just hitting the reject button to beat the clock.
This revamped rule has started to make waves, encouraging more open lines of communication and problem-solving between permit seekers and the powers that be. It’s a more hands-on approach, aiming to keep applications moving forward instead of letting them fall at the final hurdle.
While there’s still a road to travel in making ADU projects smoother from start to finish, this revised 60-day rule is definitely a step in the right direction. Staying on top of these changes and guiding clients through the maze is part of my day-to-day, and seeing the policy shift towards a more constructive and cooperative process is a win in my book.
Getting through the permit process for your ADU doesn’t have to be a nightmare. With over two decades in the game, I’ve picked up a few tricks to make this journey a whole lot smoother. Here are some golden tips to help you steer clear of common pitfalls and get that green light without losing sleep.
First up, teaming up with an ADU expert is like finding a treasure map. These pros know the lay of the land when it comes to zoning and building codes in your area. They’re your guide, helping you plot a course that avoids the quicksand of delays and do-overs. Trust me, having a seasoned navigator by your side can save you a ton of time, money, and headaches.
One of my top tips? Look into pre-approved floor plans if your county offers them. Places like San Diego and Santa Cruz have these on the shelf, and they’re basically a fast pass through the permit line. These plans need a bit of tweaking to suit your exact spot, but they’ve got the seal of approval from local building chiefs, which can slash weeks or months off your wait time.
Even with an ace up your sleeve and pre-approved designs, it’s crucial for you to get clued up on the whole ADU process and what your rights are. Knowing the ins and outs, like the 60-day rule and the specific hoops you need to jump through for your area, keeps you in the driver’s seat.
I always tell my clients to dive in, ask loads of questions, and keep a keen eye on the process. The more you know, the more you can work hand in glove with your ADU expert, keeping your project humming along without a hitch.
Remember, building an ADU is a big deal, full of twists and turns. But with some smart planning, a good guide, and a bit of knowledge, you can make it through the permit jungle and start bringing your ADU dream to life.