La Habra ADU rules explained in plain English
If you are thinking about building an ADU in La Habra, you are probably in that excited but slightly stressed stage.
Excited because you can already picture the extra space. A place for family. A quiet office. A rental unit that helps the mortgage feel lighter.
Stressed because the rules feel like a maze. Size limits. Setbacks. Parking. Permits. And then someone mentions a JADU and you are like, wait, do I need to learn a whole new language now.
So let us make this easy to understand.
This is a homeowner friendly guide to La Habra ADU rules, including what the city allows, what the newest ordinance update covers, and the stuff that tends to surprise people once plans are already drawn.
First, what La Habra considers an ADU and what changed recently
La Habra has an official Accessory Dwelling Units page that summarizes local rules and also notes the city approved amendments and adopted Ordinance CC2025 05 on July 21, 2025 to reflect changes in state ADU requirements.
Translation: the rules were updated to stay aligned with state law, and you want your plan to match the current standards, not a random blog post from a few years ago.
How many units can you build on a single family lot in La Habra
This is one of the most common questions.
La Habra’s ordinance states that, except for certain state law mandatory approval cases, only one ADU and one JADU may be built on a single unit residentially zoned lot.
So for most homeowners, the short version is: you can typically do one ADU plus one JADU.
If you are already thinking, what is the difference, do not worry. We will get there.
ADU size limits in La Habra
This is where people get tripped up, because the answer depends on what kind of ADU you are building.
New detached ADU size
La Habra’s ordinance says the floor area of a new detached ADU may not exceed 1,200 square feet.
New attached ADU size
La Habra’s ordinance says the floor area of a new attached ADU may not exceed:
850 square feet for an ADU with zero to one bedrooms, or
1,000 square feet for an ADU with two or more bedrooms
It also states the total floor area of a new attached ADU shall not exceed fifty percent of the existing primary dwelling.
ADU created inside the existing home
Here is a detail most homeowners love: La Habra’s ordinance states there is no size limit on an ADU created within an existing or proposed primary dwelling.
That does not mean it is a free for all. It still needs to meet building code and be a real independent living unit. But it does mean interior conversions can be more flexible than people assume.
ADU created from an existing accessory structure
If you are converting an existing accessory structure, the ordinance includes specifics. For example, if an existing accessory structure is 1,050 square feet or less, the floor area may be increased up to a maximum of 1,200 square feet when converting to an ADU.
That matters for garage conversions and for anyone with a larger detached structure already on the property.
Height rules in La Habra
La Habra’s ordinance states ADUs are subject to the same height standards that apply to primary dwellings on the lot in the applicable zoning district.
In real life, that means height depends on your zoning and your underlying district standards.
For multi family lots, the city’s ADU page also calls out that detached ADUs are subject to a 16 foot height limit and 4 foot rear and side yard setbacks.
If you are on a single family lot and you are trying to do something taller or more complex, this is exactly the point where it helps to talk to a contractor early so you do not design something that has to be reworked later.
Setbacks and building separation in La Habra
Setbacks are one of the biggest reasons people get stuck on design.
La Habra’s ordinance lists these setback standards:
Front setback follows the base zoning standard
Side setback is four feet
Rear setback is four feet
It also states detached ADUs must be at least ten feet from any other building on the lot.
Here is the part homeowners love.
If you are converting an existing structure, the ordinance states no additional setbacks are required for an existing constructed structure that is converted to an ADU.
So if your garage is already close to the property line, a conversion can sometimes avoid the setback problem that a brand new detached unit would run into.
Parking rules and when parking is not required
Parking is one of those topics that causes unnecessary panic. People imagine losing their driveway or redesigning everything.
La Habra’s ordinance states one parking space shall be provided for an ADU unless the ADU has no bedrooms, in which case no parking space is required. It also states the required parking space may be tandem parking on a driveway and may be allowed in a setback area, depending on feasibility and safety conditions.
Then it lists situations where no parking space is required for an ADU, including when:
The ADU is within one half mile walking distance of public transit
It is in an architecturally and historically significant district
It is part of a proposed or existing primary residence or an accessory structure
On street parking permits are required but not offered to the occupant
A car share vehicle is located within one block
It also states that if a garage or parking space is demolished or converted into an ADU, those off street parking spaces do not need to be replaced.
For JADUs, the ordinance is even simpler: no additional parking is required.
Rental rules you need to know
This one matters a lot if you are thinking rental income.
La Habra’s ordinance states ADUs and JADUs may not be rented for periods of less than thirty one days.
So if your plan was short term rental style, you need to talk through a different approach.
JADU rules in La Habra
A JADU is not the same as an ADU. It is usually inside the existing home and has its own rules.
La Habra’s ordinance says:
One JADU is allowed within an existing or proposed single unit dwelling, including in an attached garage
A JADU must include an efficiency kitchen
A JADU must have a separate entrance, located on a different side of the residence than the front door
A JADU may share sanitation facilities with the main home, and if it does, it needs direct interior access
No additional parking is required
Then it gets into the deed restriction requirements. This is important.
The ordinance says the JADU deed restriction includes that:
The JADU cannot be sold separately
The JADU is restricted to a maximum size of 500 square feet
The JADU cannot be rented for less than thirty one days
The owner must reside either in the primary dwelling or in the JADU, with certain exceptions for government agencies, land trusts, or housing organizations
This is why some homeowners choose an ADU instead of a JADU, even if a JADU feels easier at first. The owner occupancy requirement and the deed restriction are real factors.
Design standards that can affect your plans
A lot of people do not realize La Habra also cares about how the unit looks from the street.
The ordinance states ADUs must be constructed using the same roof style as the primary unit. It also states any street facing elevation must include a minimum of three architectural features that compose a unified style, like wall cladding, window trims, shutters, plaster bands, or exterior light fixtures.
This is a good thing, honestly. It helps keep neighborhoods looking like neighborhoods, not like random add ons.
It also means you want your plans to be intentional, not rushed.
Permits and approval timelines in La Habra
This is the part that makes ADUs feel intimidating, but it is easier when you know the timeline rules.
La Habra’s ordinance states applications for ADUs and JADUs shall be ministerially approved or denied within sixty days of receipt of a complete application. It also includes a faster thirty day timeline in certain cases when using a preapproved plan or an identical plan used during the current building standards code cycle.
The city also explains on its ADU page that you should hire experienced professionals, which is their polite way of saying, do not wing this if you want it to go smoothly.
Fees, impact fees, and a detail that saves money on smaller ADUs
This part is easy to miss, but it can matter for budget planning.
La Habra’s ordinance states no impact fee shall be imposed on any ADU less than 750 square feet in size.
So if you are trying to keep an ADU smaller on purpose, it is not only about build cost. There can be fee differences too.
What if you have an older unpermitted unit
This is not everyone, but it is more common than people think.
La Habra’s ordinance includes provisions related to unpermitted ADUs or JADUs constructed prior to January 1, 2020, including that the city shall not penalize an applicant for having the unpermitted unit and may allow a confidential third party code inspection before applying, with the focus on health and safety compliance.
If this is your situation, it is worth handling carefully and correctly. It can be fixable, but you want a plan before you start paperwork.
A simple way to decide what to build
If you want to avoid analysis paralysis, think through these questions in order.
- What is the goal
Family space, rental, office, long term living - Do you want the unit detached or inside the existing home
Detached often gives privacy
Inside can be simpler and more flexible on size - Do you need owner occupancy flexibility
If yes, pay attention to the JADU deed restriction rules - How important is a full bathroom and full kitchen setup
ADUs must have separate kitchen and bathroom facilities from the primary dwelling - Are you aiming under 750 square feet
Because fee rules can change under that threshold
If you want help walking through those choices without guessing, this is a great time to start on the ADU page and then reach out through Contact Us.
How AC and R helps keep ADU rules from feeling overwhelming
Most homeowners do not want to become zoning experts. They just want a unit that gets approved and built right.
A smooth ADU project usually comes down to planning the three things that cause most delays:
Design that matches the rules
Utilities that are planned early
A permit plan that is complete the first time
That is also why it helps when your contractor can coordinate the systems work, especially Plumbing and Electrical, instead of treating them like an afterthought.
If you want to see the kind of work quality and project flow people talk about, link Case Studies and Reviews here.
Ready to plan an ADU in La Habra
If you are serious about building an ADU or a JADU, the best next step is a walkthrough and a scope conversation.
Start with ADU to see the service, then use Contact Us to schedule a visit.
If you are planning your budget in a way that feels comfortable, link Financing here.
