M - Core Construction, B General Building Contractor in Concord, CA
M - Core Construction operating as a sole owner holds an active California contractor license (CSLB #933586), valid through Jun 30, 2027. First issued in 2009, the license has been on the CSLB roster for 17 years. It carries a single CSLB classification: B — General Building Contractor. Records show an active surety bond on file with Merchants Bonding Company (mutual) and an exempt workers' compensation status (no employees on payroll). The business is based in Concord, in Contra Costa County, California.
- License Number
- 933586
- Issued
- Jun 8, 2009
- Status
- CLEAR
- Expires
- Jun 30, 2027
- Entity
- Sole Owner
- Surety
- Merchants Bonding Company (mutual)
- Bond Number
- 101513639
- Effective
- Apr 30, 2025
- Status
- Active
- Coverage
- Exempt
- Carrier
- —
- Policy Number
- —
- Effective
- Sep 2, 2025
- Expires
- —
This contractor warrants a closer look before contracting:
- Workers' comp listed as exempt
An automated summary of public CSLB data, not a credit score, rating, or endorsement. How we determine this
Is M - Core Construction licensed in California?
Yes. M - Core Construction holds California Contractors State License Board license number 933586, which is active and in good standing. The license was first issued on June 8, 2009. It is valid through June 30, 2027.
What does M - Core Construction specialize in?
M - Core Construction is licensed for one CSLB classification: B General Building Contractor.
Where is M - Core Construction headquartered?
M - Core Construction is headquartered at 2525 Hamilton Ave, Concord, CA 94519, in Contra Costa County, California.
Does M - Core Construction have an active surety bond on file with CSLB?
Yes. M - Core Construction has an active California contractor surety bond filed with Merchants Bonding Company (mutual).
Does M - Core Construction carry workers' compensation coverage?
M - Core Construction reports an exempt workers' compensation status, meaning the business has no employees on payroll.
How do I verify M - Core Construction's contractor license?
You can verify M - Core Construction's license directly with the California Contractors State License Board at https://www.cslb.ca.gov/OnlineServices/CheckLicenseII/LicenseDetail.aspx?LicNum=933586.
- License issuedJun 8, 2009
- Bond activeApr 30, 2025
- WC coverage startsSep 2, 2025
- License expiresJun 30, 2027
- Oliver & Company INC#276682Richmond·B General Building Contractor
- White L H General Building Contractor#275246Lafayette·B General Building Contractor
- Wooldridge Construction CO INC#273105Pleasant Hill·B General Building Contractor
- Anza Engineering CORP#273213Brentwood·A General Engineering Contractor
- Connolly Heating & Air Conditioning#268327Pacheco·B General Building Contractor
- Mazzamuto Construction#266149Martinez·B General Building Contractor
- Mka Constructors INC#262916Walnut Creek·B General Building Contractor
- Maida Construction Company#293985Walnut Creek·B General Building Contractor
Working a California job with M - Core Construction, or chasing an unpaid invoice? These free tools track your mechanics lien deadlines and rights under California Civil Code §§8200–8848.
- California preliminary notice deadline calculatorFind your 20-day deadline and the lien rights at risk.
- Do I need a preliminary notice in California?Answer a few questions to see if the 20-day notice applies.
- Did I lose my California lien rights?Check whether your mechanics lien window has passed.
- Unpaid construction invoice in CaliforniaYour options and deadlines for collecting on a California job.
Own M - Core Construction? Claim or correct this profile