Rules by cityBuildersJunior ADUsOrdinance complianceThe statuteSB 543

California / Builders / ADU Builders Group Inc.

Licence verified, no local permit history

ADU Builders Group Inc.

CSLB #1126603 · ADU BUILDERS GROUP · Corporation

Design-build ADU contractor based in Hayward. Builds detached ADUs, attached ADUs, garage conversions, interior conversions and junior ADUs. Says it serves 29 California cities.

What the records show

Confirmed from public records
0ADU permits on file
1Years licensed
5Areas they work
ClearLicence standing

No ADU permits are on file under this licence in the cities we cover. Most California cities do not publish the contractor's name on a building permit, so this usually reflects what a city discloses rather than what a builder has built. Ask them directly for recent addresses and permit numbers you can look up.

Licence and insurance

California Contractors State License Board
Status
Licence clear
Classification
B, general building
Issued
2024-09-18 · expires 2026-09-30
Contractor bond
$25,000 JET INSURANCE COMPANY
Workers' compensation
Covered EMPLOYERS COMPENSATION INSURANCE COMPANY
Disciplinary action
None on record
Registered address
HAYWARD, Alameda County

Where they work

Confirmed from public records
CityStandingADU permitsPre-approved plans
Fremont Licensed none no
Mountain View Licensed none no
San Jose Licensed none no
Santa Clara Licensed none no
Sunnyvale Licensed none no

About the company

From their website

www.adubuildersgroup.com

The company’s own description · licence shown on their advertising matches the state register

Works as
Design-build ADU contractor
Builds
detached ADUs attached ADUs garage conversions interior conversions junior ADUs
Handles permitting
Yes, on the owner’s behalf
Typical timeline
No company-wide contract-to-completion duration is stated. Project examples indicate approximately 5–9 months or 6–10 months from design/planning through permitting, construction, and final completion; one example estimates 8–16 weeks of construction after permits.
Warranty
Three-year project warranty covering workmanship, electrical, waterproofing, and plumbing-system installation; complimentary annual project inspections for three years; and a ten-year structural-components warranty.
Financing offered
No
Contact
(408) 413-3373 · adubuildersgroup@gmail.com · website
Owners named
Antolin Corona

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ADU Standards does not issue zoning determinations and does not endorse contractors. Licence details are from the California Contractors State License Board, checked 2026-08-15. A city that pre-approves a plan has vetted the plan, not the builder. Always confirm licence standing at cslb.ca.gov before you sign anything.