Home/Areas We Serve/Fullerton
ADU builder in Fullerton, CA
Fullerton issued more ADU permits than any other Orange County city in 2025. Established neighborhoods, generous lots and steady rental demand near the universities make it one of the best places in the county to add a backyard home.
North Orange County
Building an ADU in Fullerton.
What’s different about adding an ADU here, and how we plan around it.
Orange County’s most active ADU market
Fullerton issued 589 ADU permits in 2025, up from 424 the year before, more than any other city in the county. Its plan checkers review ADUs constantly, which helps keep timelines predictable.
Room to build up
Fullerton’s height limits leave room for two-story ADUs and units over a garage, useful on lots where you want to keep the yard.
Pre-approved plans in the works
The city has contracted an architecture firm to prepare pre-approved attached and detached ADU plans. We’ll compare those with our own pre-engineered plans for your lot, budget and timeline.
Plans that fit
Floor plans that work within Fullerton’s rules.
These ready-to-build plans fit Fullerton’s size limits. Our studio can adjust any of them to your lot.
Plan 400B
Studio · 1 Bath · 400 ft²
Plan 440
1 Bed · 1 Bath · 440 ft²
Plan 484
1 Bed · 1 Bath · 484 ft²
Plan 832
2 Bed · 1 Bath · 832 ft²
Plan 837C
2 Bed · 2 Bath · 837 ft²
Plan 1200LAG
3 Bed · 2 Bath · 1,200 ft²
How we work in Fullerton
One team from first visit to move-in.
01
Free ADU analysis
We review your Fullerton lot, what the local rules allow and which plans fit, with an estimated cost.
02
Design
Our in-house studio prepares construction-ready plans in about 1–2 months.
03
Permits
We submit to the City of Fullerton and handle every round of plan check.
04
Fixed-price build
Construction in about 4–5 months, managed by one project manager from our Long Beach office.
Fullerton ADU questions
Common questions in Fullerton.
How many ADUs are being built in Fullerton?
Fullerton issued 589 ADU permits in 2025, the most of any Orange County city, according to state housing data.
Can I build a two-story ADU in Fullerton?
In many cases, yes. Fullerton’s ADU height limits allow two-story designs and units over a garage; we confirm what applies to your lot in our free analysis.
Is an ADU a good rental near Cal State Fullerton?
Neighborhoods near the university see steady demand from students, staff and young professionals. New ADUs must be rented for terms longer than 30 days.
Nearby
We also build in
Start a Conversation
Planning an ADU in Fullerton?
Tell us about your Fullerton property and we’ll prepare a free ADU analysis: what fits on your lot, the rules that apply, recommended plans, estimated cost and timeline.
Subscribe to Our News
"*" indicates required fields
Serving homeowners throughout Los Angeles and Orange County.