What is an ADU?
An Accessory Dwelling Unit (ADU) is a secondary housing unit built on the same property as a primary residence. It can be attached to the main home or detached as a separate structure in the backyard. A Junior ADU (JADU), on the other hand, is a converted space within the main home, such as a repurposed garage or spare room. These additional living spaces provide flexibility, rental income opportunities, or extra room for family members, and they are only permitted on single-family residential properties.
Types of ADU
Connected to the main home.
Separate structure in the backyard.
Converted interior space, such as a garage.
ADU Regulations & Permits
Max Number of Units Allowed:
1 ADU per property
1 JADU if the owner lives on-site
Size Limits:
Attached ADU: Up to 50% of main home (max 1,200 sqft)
Detached ADU: 800 sqft within setbacks, 1,200 sqft if space allows
JADU: Max 500 sqft, based on conversion size
Permit Required?
Yes (Local municipal approval needed)
Permit Fees?
Varies by city & project size.
Fee Waiver
SB 13 eliminates impact fees for ADUs under 750 sqft!
ADU Laws & Updates
SB 1211 (2025 Update)
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Allows up to 8 ADUs on multi-family properties (previously 2 max).
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Parking Exemptions: No need to replace demolished parking spaces.
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Simplified Approval: Local agencies can’t add extra design restrictions.
SB 13 (Current Law)
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Relaxed Construction Rules (e.g., reduced parking & setback restrictions).
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Fee Reductions for ADUs under 750 sqft.
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Legalizes Unpermitted ADUs (Easy compliance process).
Pricing
$8000+
$10000+
ADU
Grant
Program
CalHFA
Over the past several years, California’s housing production has failed to keep up with demand, leading to skyrocketing home prices and limited availability. Many Californians are now forced to commute long distances just to find affordable housing near their workplaces. To address this crisis, Accessory Dwelling Units (ADUs) have emerged as an innovative, cost-effective solution, providing additional housing options beyond traditional construction methods.
Recognizing the potential of ADUs, new state funding laws have been enacted to incentivize and promote their development. Often referred to as granny flats, in-law units, backyard cottages, or secondary units, ADUs offer a practical and affordable way to increase California’s housing supply.
The California Housing Finance Agency (CalHFA) has successfully contributed to the state’s housing expansion by offering grants of up to $40,000. These grants reimburse homeowners for pre-development and non-recurring closing costs related to ADU construction.
Eligible pre-development costs include:
✔ Site preparation
✔ Architectural designs
✔ Permits & impact fees
✔ Soil testing & property surveys
✔ Energy reports & assessments
📅 December 28, 2023 – The most recent round of ADU funding has been fully allocated. A huge thank you to our Approved Participants for their dedication to expanding housing opportunities. Congratulations to all grantees—wishing you success as you bring your ADU projects to life!
FAQ
What is an ADU?
An Accessory Dwelling Unit (ADU) is a self-contained living space built on the same property as a primary residence. It can be either attached to the main home or detached as a separate structure.
What is a JADU?
A Junior Accessory Dwelling Unit (JADU) is a converted space within the existing home, such as a garage or spare room, that functions as an independent living area.
Which Properties are Eligible for an ADU?
ADUs can be built on residential properties that have an existing single-family dwelling.
Types of ADUs
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Attached ADU – Connected to the primary residence.
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Detached ADU – A separate structure built on the property.
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JADU – A converted interior space within the main home.
How Many ADUs Can You Build?
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ADU: One unit per property.
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JADU: One unit per property, only if the owner lives in the main residence or in the JADU itself.
Is a Permit Required for an ADU?
Yes, obtaining a permit from your local municipality is required for all ADU projects.
How Much Do ADU Permits Cost?
Permit fees vary by city and depend on the size and complexity of the project.
Are There Any Fee Waivers for ADUs in California?
Yes! Under SB 13, ADUs smaller than 750 sqft are exempt from impact fees, making them more affordable for homeowners.
Do ADUs Require Fire Sprinklers?
No, fire sprinklers are not required for an ADU unless the main residence already has them.
Let's Discuss
Your Next Project
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Service Area:
California State
2500 Red Hill Ave, Suite 200, Santa Ana, CA 92705
info@adunest.com
Phone:
8053167039