ADU Construction in Atherton

Atherton’s large estate lots and California ADU law create a remarkable opportunity: add a fully permitted, architecturally exceptional ADU to your property — whether as a guest house, caretaker’s quarters, multigenerational suite, or premium rental unit.

Atlas General Construction (CSLB #1059664) builds Atherton ADUs to estate standards. We understand that on a property worth $10–30 million, the ADU must be architecturally consistent, functionally excellent, and constructed with absolute discretion.

California ADU law allows Atherton homeowners to build:

• Detached ADU up to 1,200 sq ft: A freestanding structure anywhere on your lot, designed to match your main residence.
• JADU up to 500 sq ft: Within your existing home footprint, requiring only a kitchenette and separate entrance.
• Garage Conversion: If your garage is detached, it can be converted to a fully permitted living unit.

We design every Atherton ADU with the same materials, architectural language, and quality level as the primary residence.

San Mateo County manages building permits for Atherton. Our process:

1. Confidential Consultation: We meet on-site (or virtually) to assess your property and discuss ADU options. All conversations are strictly confidential.

2. Architectural Design: Our partner architects produce custom plans matched to your estate’s style and materials.

3. Permit Management: We submit to San Mateo County and manage the full plan check process.

4. Premium Construction: Licensed crew, premium materials, daily updates, and zero compromise on quality.

5. Final Delivery: Certificate of occupancy, full walkthrough, and comprehensive warranty.