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ADU builder in Orange, CA
The City of Orange is home to Old Towne, one of Southern California’s best-preserved historic districts, and to Eichler neighborhoods with their own design standards. We design ADUs that fit their surroundings and the city’s rules.
North Orange County
Building an ADU in Orange.
What’s different about adding an ADU here, and how we plan around it.
Old Towne Historic District
Old Towne’s earliest buildings date to the 1880s. ADUs proposed in a historic overlay district, or on a property in the city’s historic inventory, require a Historic Resource Assessment, and conversions of existing Old Towne structures are evaluated against the city’s Historic Preservation Design Standards.
Eichler neighborhoods
Orange has its own Orange Eichler Design Standards. An ADU on an Eichler property should echo its mid-century architecture, and we design with that in mind.
HOAs can’t block an ADU
Many newer Orange neighborhoods have HOAs with design rules. HOAs can’t reasonably prohibit an ADU, but their standards can add time, so we review them early.
Plans that fit
Floor plans that work within Orange’s rules.
These ready-to-build plans fit Orange’s size, height limits. Our studio can adjust any of them to your lot.
Plan 400A
Studio · 1 Bath · 400 ft²
Plan 500B
1 Bed · 1 Bath · 500 ft²
Plan 720
1 Bed · 1 Bath · 720 ft²
Plan 854
2 Bed · 2 Bath · 854 ft²
Plan 910
2 Bed · 1 Bath · 910 ft²
Plan 1000
3 Bed · 2 Bath · 1,000 ft²
How we work in Orange
One team from first visit to move-in.
01
Free ADU analysis
We review your Orange 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 Orange 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.
Orange ADU questions
Common questions in Orange.
Can I build an ADU in Old Towne Orange?
Yes. ADUs are allowed, but properties in the historic district or on the city’s historic inventory need a Historic Resource Assessment and must meet historic design standards. Early design coordination saves time.
How big can an ADU be in Orange?
Detached ADUs can be up to 1,000 sq ft and 16 ft tall. A junior ADU inside the house can be up to 500 sq ft.
Can my HOA stop me from building an ADU in Orange?
No. Under state law, HOAs can’t reasonably prohibit an ADU or junior ADU, though their design rules may still apply.
Nearby
We also build in
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Tell us about your Orange property and we’ll prepare a free ADU analysis: what fits on your lot, the rules that apply, recommended plans, estimated cost and timeline.
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Serving homeowners throughout Los Angeles and Orange County.