Rules by cityBuildersJunior ADUsOrdinance complianceThe statuteSB 543

California / Builders / GMJ Construction Inc.

Licence verified, no local permit history

GMJ Construction Inc.

CSLB #996536 · G M J CONSTRUCTION INC · Corporation

Design-build ADU contractor based in Santa Clara. Builds garage conversions, junior ADUs and attached ADUs, built on site. Says it serves 19 California cities.

What the records show

Confirmed from public records
0ADU permits on file
11Years licensed
1Areas 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 Most California cities do not publish the contractor's name on a building permit, so this usually reflects what a city discloses rather than what a builder has built.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
2014-09-09 · expires 2026-09-30
Contractor bond
$25,000 WESTERN SURETY COMPANY
Workers' compensation
Covered OMAHA NATIONAL CASUALTY COMPANY
Disciplinary action
None on record
Registered address
SANTA CLARA, Santa Clara County

Where they work

Confirmed from public records
CityStandingADU permitsPre-approved plans
Sunnyvale Licensed none no

About the company

From their website

gmjconstruction.us

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

Works as
Design-build ADU contractor
Builds
garage conversions junior ADUs attached ADUs
Handles permitting
Yes, on the owner’s behalf
Typical timeline
No ADU-specific timeline is published. A customer testimonial reports an estimated 4–6 months and completion in 5.5 months after the permit was issued; the stated duration therefore excludes permitting.
Warranty
Warranties are advertised, but no warranty duration or detailed terms are stated.
Financing offered
Yes
Contact
(408) 780-0479 · info@gmj.construction · website
Owners named
Memo, Guillermo S.

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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.