La Habra Heights Zoning and ADU Guide for Homeowners

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Last updated November 13, 2026. Reviewed by the Cash Home Buyers CA team.

La Habra Heights regulates accessory dwelling units and junior ADUs in Municipal Code Chapter 7.28 and is mostly a Residential-Agricultural community of one-acre-plus lots. This guide summarizes the city’s ADU and JADU standards, the fire-zone limits that matter on hillside lots, parking, utilities and fees, and how the zoning districts shape what you can build or sell.

Always confirm current text with the city’s Planning staff, since the chapter has been amended more than once.

La Habra Heights ADU rules at a glance

Governing chapter	Municipal Code Chapter 7.28, Accessory Dwelling Units and Junior Accessory Dwelling Units
Main residential zone	Residential-Agricultural (R-A); most lots are one acre or larger
JADU size	Up to 500 sq ft inside an existing or proposed single-family home
Detached or attached ADU	Up to 850 sq ft for a studio or one bedroom, 1,000 sq ft for more than one bedroom; attached units limited to 50% of the primary dwelling floor area
Height	Detached 16 ft, up to 18 ft near major transit; attached 25 ft or the zone limit, whichever is lower, and two stories maximum
Setbacks	At least 4 ft side and rear; none when replacing an existing structure in the same location and dimensions
Owner occupancy	None for ADUs; required for a JADU that shares sanitation facilities
Rental term	No ADU or JADU rented for fewer than 30 days

How the city treats ADUs

The city’s ADU page points residents to Municipal Code Chapter 7.28 and describes a junior ADU as a unit of no more than 500 square feet contained within a single-family home. The chapter, adopted in 2020 and amended in 2023, implements the state ADU statute.

It allows ADUs and JADUs in residential and mixed-use zones when the project qualifies for a building permit only, and in zones that allow single-family or multifamily use when it needs an ADU permit.

The city must say whether an application is complete within 15 business days and approve or deny a complete application within 60 days, or it is deemed approved unless the applicant asks for a delay.

The Very High Fire Hazard Severity Zone limit

This is the rule that most affects La Habra Heights owners.

Section 7.28.050 says no ADU is permitted on a lot in a Very High Fire Hazard Severity Zone designated by the city unless the ADU is protected throughout by an approved automatic fire sprinkler system, one off-street parking space is provided for the ADU, and, for a through lot or corner lot, the lot fronts on at least one street improved with a paved roadway of at least 20 feet of unobstructed width after any dedication and improvement.

If you are buying, selling or building on a hillside lot, ask Planning whether your parcel is in the designated zone before you plan an ADU or pay for plans.

Size, height and setbacks

Detached and attached ADUs under the main section are capped at 850 square feet for a studio or one-bedroom and 1,000 square feet for more than one bedroom.

An attached ADU on a lot with an existing home is further limited to 50 percent of the existing home’s floor area, but the code says percentage limits or lot coverage and similar standards cannot require an ADU smaller than 800 square feet with four-foot side and rear setbacks.

Detached ADUs may not exceed 16 feet, with up to 18 feet near a major transit stop and up to two extra feet to match the roof pitch of the main home. Attached ADUs may not exceed 25 feet or the zone limit, whichever is lower, and two stories.

The section also keeps ADUs 35 feet from the front property line and out of the area between the primary dwelling and the front line, subject to the 800 square foot protection, and requires four feet from side and rear lines unless the unit replaces an existing structure in the same place and size.

Parking, utilities and fees

The code requires one parking space per ADU or per bedroom, whichever is less, and allows tandem parking on a driveway.

Parking is not required in several cases, including within a half mile walking distance of public transit, in a historic district, when the ADU is within the existing home or an existing accessory structure, and when parking is not offered to ADU occupants under on-street permit rules.

Parking removed by a garage conversion does not have to be replaced, and a JADU cannot trigger added parking. Impact fees are barred for ADUs of 750 square feet or less and JADUs of 500 square feet or less, and larger ADUs pay proportionately.

A separate utility connection is required for most new ADUs, but not for conversions of existing space.

Junior ADUs, rentals and deed rules

A JADU must be inside an existing or proposed single-family home, which includes an attached garage, with at least an efficiency kitchen. Owner occupancy is required only if the JADU shares sanitation facilities with the main home.

No ADU or JADU can be rented for fewer than 30 days, a rule that applies regardless of when the unit was created. A deed restriction cannot prohibit or unreasonably restrict an ADU or JADU that meets state law.

Zoning districts that shape your lot

The R-A zone is the main residential district. Detached guest houses call for a minimum of 43,560 square feet, which is one acre, nonhabitable structures such as barns are permitted, and animal keeping requires an Animal Keeping Permit.

The city also has a Multifamily Residential zone with a one-acre minimum and density of 20 to 24 units per acre, several open space zones, a Specific Plan Overlay for larger parcels that could be divided into ten or more lots, and an Institutional Overlay. Know your zone before assuming what a buyer can add.

State ADU law and La Habra Heights

California’s ADU statute, Government Code section 66314 and following, sets a floor that every city must follow, and local ordinances fill in the details.

The state requires ministerial review within 60 days of a complete application, bars a city from requiring more than a limited set of standards, and generally allows an ADU or conversion inside existing space without added setbacks.

The California Department of Housing and Community Development (HCD) publishes a handbook and keeps a list of the state requirements. Because state law changes often, treat the city’s current ordinance and handout as the final word on size, height, parking and fees for your lot.

ADUs, garage conversions and selling a La Habra Heights house

Many older homes have a converted garage or a backyard unit built without permits. Buyers and lenders ask about them, and California sellers generally disclose known unpermitted work. Our guide to selling as-is with unpermitted work explains the rules, and our Prop 13 guide explains how new construction can affect property tax. Before you list:

Check city records for permits on any ADU, conversion or addition.
Ask Planning whether the structure could qualify under current rules.
Estimate plans, fees and corrections needed to legalize it.
Compare that with selling as-is and letting a cash buyer take on the legalization.

Questions to ask Planning before you design

Does my lot and zone allow an ADU, a junior ADU, or both?
Is a pre-approved or pre-reviewed ADU plan available?
What are the current impact, utility and school fees for the size I am considering?
Can my existing garage or accessory structure be converted without changing its footprint?
Are there fire, slope, easement or utility constraints on my lot?

Junior ADUs and garage conversions in more detail

State law treats a junior ADU as a unit of up to 500 square feet created inside the walls of an existing or proposed single-family home, with an efficiency kitchen and a recorded restriction that keeps it from being sold apart from the house.

A garage conversion is a different path: the unit replaces the garage, and state law generally does not require the city to demand replacement parking. Both are common sources of unpermitted space in older La Habra Heights neighborhoods, which is why buyers’ agents and appraisers ask for the permit record.

If a conversion was done without a permit, the usual fix is to submit as-built drawings, pay the fees and pass inspection, which can take months and cost real money.

Fees, utilities and property tax

State law limits the impact fees a city can charge on smaller ADUs and on conversions of existing space, and it limits when a separate utility connection can be required.

Larger new units can still carry impact fees, school fees and water or sewer connection charges, so ask for an itemized estimate before you commit to plans. New construction is generally reassessed for property tax under Prop 13, which means an ADU can raise the bill for the whole property. Our Prop 13 guide explains how reassessment works.

Why ADUs matter for resale

A permitted ADU can add rental income and appeal for some buyers, but an unpermitted one can complicate financing and appraisal. Lenders typically want permitted living area, and an appraiser may not count unpermitted space.

Because an ADU generally cannot be sold separately from the main home, its value comes through the sale of the whole property.

If you inherited a house with an old backyard unit, or bought one with a converted garage, check what the city has on file before you decide how to sell. Our probate home sale guide covers inherited property.

How to sell a house in La Habra Heights

Ask the city for the permit record on any ADU, guest house or conversion.
Collect plans, inspection records and any city notices.
Request a no-obligation cash offer for the house as it stands.
Choose your closing date.
Close with no repairs, legalization or showings required.

See also our La Habra Heights page and the Los Angeles County hub.

Own a La Habra Heights home with an ADU or guest house? Sell as-is for cash.

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Frequently asked questions

Does La Habra Heights allow ADUs?

Yes. Chapter 7.28 allows ADUs and junior ADUs, with a 60-day approval deadline once an application is complete, but lots in a designated Very High Fire Hazard Severity Zone face added requirements.

What is the fire zone rule for ADUs?

An ADU in a Very High Fire Hazard Severity Zone must have an automatic fire sprinkler system, one off-street parking space, and, on through or corner lots, front a street with at least 20 feet of paved roadway.

How big can an ADU be?

Up to 850 square feet for a studio or one bedroom and 1,000 square feet for more than one bedroom, with attached units limited to 50 percent of the main home’s floor area, subject to an 800 square foot minimum protection.

Do I have to live on the property?

Not for an ADU. A JADU requires owner occupancy only if it shares sanitation facilities with the main home.

Can I rent an ADU short-term?

No. The code bars renting any ADU or JADU for a term shorter than 30 days.

Can I sell a La Habra Heights house with an unpermitted ADU?

Yes. You can disclose it and sell as-is, including to a cash buyer. Our statewide guide explains the disclosure rules.

More guides

Sources

This guide is general information from public sources, not legal advice. Confirm current rules, fees and hours with the city.