ADU Locator

1 Best ADU Builders in Altadena, California

Verified ADU contractors and builders in Altadena, CA

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Go Home Builders

Go Home Builders is a company built around two simple ideas: communicate honestly and do what you say you’re going to do. They guide clients through the ADU building process with transparency and respect.

(844) 464-6460
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Frequently Asked Questions — ADU Builders in Altadena

How much does it cost to hire an ADU builder in Altadena?

ADU construction costs in Altadena, California vary widely depending on size, type, and site conditions. Detached ADUs typically range from $150,000–$400,000+, while garage conversions and attached ADUs can be more affordable. Contact multiple builders in Altadena to get accurate quotes for your specific project.

How long does it take to build an ADU in Altadena?

In Altadena, the ADU construction timeline typically ranges from 6 to 18 months from permit application to move-in. Permitting alone can take 2–6 months depending on California local regulations. Prefab and modular ADUs often have faster timelines than site-built units.

Do I need a permit to build an ADU in Altadena?

Yes, a building permit is required for ADU construction in Altadena, California. Your ADU builder will typically handle the permit application as part of their service. California has adopted streamlined ADU permitting laws in recent years, which may reduce wait times.

What types of ADUs can be built in Altadena?

Common ADU types in Altadena include detached ADUs (backyard cottages), attached ADUs, garage conversions, basement conversions, and prefab/modular ADUs. The best type for your property depends on lot size, zoning, and budget. A local Altadena ADU builder can advise on what's allowed on your specific parcel.