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Posted 15th May 2023

Fallbrook ADU Permit


Getting a Fallbrook ADU permit is one of the important tasks when building or converting an ADU. The process can, however, get complex and lengthy if you have no idea how to go about it. Working with Fallbrook ADU specialists can reduce these challenges and speed up your ADU.

Fallbrook ADU Permit Requirements

Fallbrook property owners can add an ADU to their single-family or multi-family residential properties. Under state law, each single-family home may create at least one ADU and one Junior Accessory Dwelling Unit (JADU). Multi-family lots, per every four existing residential units, may create one ADU if the existing units were legally established.

Types of ADUs allowed

The City of Fallbrook allows three types of ADUs: Detached ADU, Attached ADU, and Junior ADU. Accessory Dwelling Units (ADUs) may be newly constructed or converted from existing space. Junior Accessory Dwelling Units (JADUs) must be converted from existing space.

Lot size

In Fallbrook, single-family and multi-family residential properties are not subject to the minimum lot size of the underlying zoning district or by ordinance for ADU projects. This is in accordance with the updated state law AB-68.

ADU size

Residential parcels in Fallbrook can add up to 850 square feet for a one-bedroom ADU, or up to 1,000 square feet for a two-bedroom ADU. This should be observed regardless of the underlying zoning standards of the property.

A Junior ADU is allowed up to 500 square feet. According to California Residential Code, the minimum size of any living unit is 150 square feet, including ADUs and JADUs.


For a detached new construction ADU in Fallbrook, setbacks shall not exceed 4 feet from the rear and side lot lines. No setbacks for ADUs and JADUs converted from legally established existing space shall be required.

State law AB-68 also ascertains that attached new construction ADUs and conversions from existing space to be expanded must comply with the setbacks of the underlying zone.


According to updated state law AB-68, replacement parking shall not apply to properties that convert an existing garage to an ADU or JADU in Fallbrook.

Fire Safety

Fallbrook ADUs are not required to provide fire sprinklers if they are not required for the primary residence and may employ alternative methods for fire protection.


According to state law SB-13, owner-occupancy will not be required for new ADUs, both conversions and new constructions, built between 2020 and 2025 in Fallbrook.

Utility connections

In Fallbrook, local health officer approval is required where a private sewage disposal system is being used, according to state requirements.

Allowed Zones

Since 2020, all residential zoning districts, including single-family and multi-family, are allowed to build ADUs in Fallbrook, according to state law.

Cost of A Fallbrook ADU permit

The cost of obtaining an ADU permit in Fallbrook varies depending on the size and complexity of the project. The City of Fallbrook charges fees for plan checks, permit issuance, and inspection services.

For an ADU, the plan check fee typically ranges from a few hundred to a few thousand dollars. The permit issuance fee for an ADU is also calculated based on the value of the construction work, and it can range from several hundred to several thousand dollars.

In addition to the plan check and permit issuance fees, there are also inspection fees. The number and type of inspections required depend on the project’s scope. Inspection fees can range from a few hundred to a few thousand dollars.


Cost ItemCost Range
Application fee$1,000 – $2,500
Building permit fee$5,000 – $10,000
Plan check fee$2,500 – $5,000
Impact fees$10,000 – $20,000
Sewer and water connection fee$5,000 – $10,000
School district fee$1,000 – $2,500
Architectural and design fees$10,000 – $20,000
Contractor fees$50,000 – $150,000

Work With Our Fallbrook ADU Experts

Adding an ADU has become much easier and more affordable with the updated state laws and Fallbrook’s streamlined permit process. By working with Better Place Remodeling, you can save time, money, and energy and ensure that your ADU is built to code and meets all your family’s needs. Contact us to schedule a quick installation if you are ready to start your ADU project.


Will I get assistance when obtaining the Fallbrook ADU permit?

Yes, our ADU experts will take over the permit-issuing process as they are well-versed with the requirements and regulations needed.

Does the City of Fallbrook dictate the design of your ADU?

State standards do not specify design restrictions or require additional design review for Fallbrook ADUs. This includes shape, materials, style, number of bedrooms and height.

Can a Fallbrook ADU add value to my home?

Yes, a well-planned and executed garage remodel can increase your home’s value by adding functional and stylish space to your property.

How does the City of Fallbrook calculate permit fees?

These fees are calculated based on the estimated value of the construction work and the number and type of inspections required.