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California contractor license
Preferred Plumbing & Drain
Preferred Plumbing & Drain of Concord holds California license 848878 (A General Engineering, C36 Plumbing). The CSLB file dated Oct 29, 2026 lists it as active.1 It expires Oct 31, 2028.
Doing business as Graves 6 Inc.
Licensed 22 years, longer than 71% of 35 active Concord plumbing contractors.
Active
Preferred Plumbing & Drain, Concord
- License
- 848878
- Class
- A General Engineering; C36 Plumbing
- Expires
- Oct 31, 2028
- Bond
- $25,000
- Workers' comp
- Insured to Oct 1, 2027
CSLB file dated Oct 29, 2026
From the CSLB file dated Oct 29, 2026. Not a consumer report; check the board before you hire.
What bond, insurance and workers' comp are on file?
- Bond
- $25,000Merchants Bonding Company (Mutual), from May 15, 2025, continuous
- Liability insurance
- Not in the CSLB fileCheck with the board
- Workers' comp
- InsuredAmtrust Insurance Company, from Oct 1, 2026, to Oct 1, 2027
Who is on this license?
- Responsible managing officer
- Thomas M. DollarhideSince Jun 20, 2011
- CEO and president
- Kathleen M. GravesSince Oct 26, 2004
- Responsible managing employee
- William J. HareSince Aug 1, 2016
What work does this license cover?
Issued Oct 26, 2004.
What other licenses does this business hold?
- Preferred Plumbing & Drain856944 · C36 · Active
Which other Concord businesses hold A General Engineering?
- Pacific - Mountain Contractors Of California Inc
- Pacific Coast Reconstruction & Building Inc
- Seecon Financial & Construction Co Inc
- Seeno Albert D Construction Co
- Sierra Bay Contractors Inc
California plumbing contractorsGeneral Contractors in ConcordCalifornia general contractors
What should you check before hiring?
What to ask before you hire
- Get the license number in writing. The name on the license should match the name on your contract and invoice.
- Check the class covers the job. A license for one trade doesn't cover another. California license classes
- Ask for a certificate of insurance sent to you by the insurance agent, not handed over by the contractor. How to read a COI
- Ask who will be on site. If a crew works on your property, ask for proof of workers' comp. An exemption on file means the contractor told the CSLB it has no employees.
- Put it in a written contract: license number, price, start date and payment schedule. Check the license again on the day you sign.
If the license is lapsed
- Don't sign or pay a deposit until the CSLB shows the license active again.
- Ask the contractor why. For a bond or insurance lapse, ask for proof that the new bond or policy was filed with the CSLB, then check again.
- If work has started, hold further payments, keep the contract, receipts and photos, and file a complaint with Contractors State License Board (CSLB).
- Check another contractor. California license lookup
Sources
- CSLB License Master (cslb.ca.gov, Oct 29, 2026)
- Contractors State License Board (CSLB)