Every new California business filing, every dayA1 Building Contractors
LUIS DIAZ RUIZ, Registered Agent
A1 Building Contractors, located in Granite Bay, CA, is a licensed ADU builder (CSLB #1094366) specializing in ADU construction, garage conversions, and custom homes. The website features project galleries and a contact form.
Filed March 27, 2026 · San Bernardino, CA · San Bernardino County
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California Secretary of State (bizfile Online) · Entity B20260150161 · Retrieved May 14, 2026
About A1 Building Contractors
A1 Master Construction LLC filed in California on March 27, 2026, with owner Luis Diaz Ruiz serving as the registered agent. The company is based in San Bernardino and operates as a construction contractor specializing in ADU building. Its domain was registered on August 31, 2024, about 7 months before the filing, through GoDaddy. The website is modern. We estimate revenue between $100,000 and $1 million and 1 to 5 employees. No annual report or EIN is on file yet.
- Owner Luis Diaz Ruiz filed personally as registered agent.
- Domain registered 7 months before the filing.
- Website is modern.
- We estimate revenue of $100K-$1M and 1-5 employees.
- No annual report or EIN on file yet.
Compiled from the state record, the company's public web presence, and our own research; revenue, employee, and footprint figures are estimates, not verified financials. Updated August 24, 2026.
One of 49 new businesses registered in San Bernardino in March 2026, one of 2 construction contractor businesses.
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Filing Details
Verified Business Profile
Contact Information
Verified Website Profile
We matched this business to its website and pulled the domain's registration (WHOIS) record. Domain age is one of the strongest signals that a filing is a truly new business and not a re-filing or paperwork change.
Frequently Asked Questions
When was A1 Building Contractors registered?
A1 Building Contractors was registered as LLC on March 27, 2026 in California.
Where is A1 Building Contractors located?
A1 Building Contractors is based in San Bernardino, CA, 92407, in San Bernardino County.
What type of business is A1 Building Contractors?
A1 Building Contractors is classified as a construction contractor business (adu builder).
Does A1 Building Contractors have an EIN on file?
No EIN was found on file for A1 Building Contractors at the time of registration.
Who Sells to This Business
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