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ADU builder in Altadena, CA
For many Altadena families, an ADU is part of coming home after the Eaton Fire, whether it’s built alongside a rebuilt house or as the first home back on the lot. Altadena is unincorporated, so LA County sets the rules, and we help you navigate them.
San Gabriel Valley
Building an ADU in Altadena.
What’s different about adding an ADU here, and how we plan around it.
ADUs in fire rebuilds
LA County lets Eaton Fire survivors include an ADU in their rebuild, and the county offers pre-approved standard plans for fire rebuilds, including ADU designs. Some rebuilding fees are being waived or refunded for qualifying single-family rebuilds; we’ll help you check eligibility.
Survivors’ ADU rights are protected
A state law signed in September 2026 pauses dense redevelopment in Altadena while residents rebuild, but Eaton Fire survivors keep the ability to build ADUs on their own lots.
County rules and the Altadena Community Standards District
As an unincorporated community, Altadena follows LA County’s ADU ordinance (detached ADUs up to 1,200 sq ft, 16 ft, or 18–20 ft near transit) and the Altadena Community Standards District. Fire-zone construction standards also apply in much of the area.
Plans that fit
Floor plans that work within Altadena’s rules.
These ready-to-build plans fit Altadena’s size, height limits. Our studio can adjust any of them to your lot.
Plan 400F
Studio · 1 Bath · 400 ft²
Plan 700
1 Bed · 1 Bath · 700 ft²
Plan 720
1 Bed · 1 Bath · 720 ft²
Plan 780
2 Bed · 1 Bath · 780 ft²
Plan 854
2 Bed · 2 Bath · 854 ft²
Plan 1000
3 Bed · 2 Bath · 1,000 ft²
How we work in Altadena
One team from first visit to move-in.
01
Free ADU analysis
We review your Altadena 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 LA County 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.
Altadena ADU questions
Common questions in Altadena.
Can I build an ADU as part of my Eaton Fire rebuild?
Yes. LA County allows an ADU alongside a rebuilt home, and it has pre-approved standard plans for fire rebuilds, including ADUs. We can coordinate the ADU with your overall rebuild plans.
Who issues ADU permits in Altadena?
Los Angeles County: Regional Planning for zoning and Public Works Building & Safety for the building permit. The county runs a One-Stop Permit Center for fire-affected properties.
Are there fee waivers for rebuilding in Altadena?
The LA County Board of Supervisors approved fee waivers and refunds for qualifying owners rebuilding single-family homes after the Eaton and Palisades fires. Eligibility rules apply; we’ll help you check them with the county.
Nearby
We also build in
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Planning an ADU in Altadena?
Tell us about your Altadena 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.