ADU Additions
Orange County

Accessory Dwelling Units that meet all OC zoning requirements, utility connections, and city permits — handled entirely by our licensed team.

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All Orange County

ADU Additions

Add Value to Your
Property in Orange County

Building an ADU involves more than just adding space. There are zoning requirements, utility connections, and design decisions that all need to come together properly. FG Real Estate Development manages the entire process — from initial zoning review through to final permit sign-off and handover.

An ADU is one of the most effective ways to increase your property value, generate rental income, or create space for family members — and Orange County’s updated ADU laws make it easier than ever to get approved.

Types of ADUs We Build

01

Detached ADU

A fully separate structure in your backyard — the most popular type in Orange County for rental income and family suites.

02

Attached ADU

An addition connected to your primary home — shares a wall, maximises available lot space.

03

Garage Conversion ADU

Convert an existing attached or detached garage into a fully livable dwelling unit.

04

Junior ADU (JADU)

Convert an existing room within your home into a self-contained unit — lower cost, faster approval.

Orange County ADU Laws — What You Need to Know

Max Size
Up to 1,200 sq ft for detached ADUs
Setbacks
4 ft side and rear setbacks minimum
Height
Up to 16 ft for detached ADUs
Parking
No parking required in most OC cities
Approval Time
60-day approval mandate from OC
Owner Occupancy
No owner-occupancy requirement until 2025

Laws vary by city. We handle all research and permit submissions for your specific location.

Featured ADU Projects

Southern California ADU
Detached ADU

Southern California ADU

Orange County, CA

Sandalwood ADU — Fountain Valley
ADU Addition

Sandalwood ADU

Fountain Valley, CA

Common Questions

ADU FAQ

How much does an ADU cost in Orange County?
ADU costs typically range from $150,000 to $350,000+ depending on size, type, and finishes. A detached ADU of 600–800 sq ft usually costs $180,000–$250,000. We provide a detailed fixed-price estimate after a free site assessment.
How long does the ADU permit process take in Orange County?
Under California law, cities must approve ADU permit applications within 60 days. However, the overall process from application submission to construction start typically takes 3–6 months. We handle all submissions to minimise delays.
Can I rent out my ADU?
Yes — ADUs can be rented on short or long-term leases. Orange County rental rates for ADUs typically range from $1,400 to $2,800+ per month depending on size and location, providing significant income potential.
Do I need to be a California owner-occupant to build an ADU?
Under current California law (through at least 2025), there is no owner-occupancy requirement. Investment properties can also add ADUs. We’ll confirm your specific city’s requirements during the free consultation.
How many ADUs can I build on one property?
In most Orange County cities, single-family properties can have up to 2 units — one standard ADU and one Junior ADU (JADU). Multi-family properties may allow additional units. We’ll review your specific lot during the free consultation.

Client Testimonial

What ADU Clients Say

“
★★★★★
“I couldn’t be happier with the ADU built by FG RED! The entire process was smooth, and the team was incredibly professional and attentive to my needs. The quality of the construction exceeded my expectations, and now I have the perfect space for my family. Highly recommend!”
Detached ADU Addition · Orange County, CA