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California contractor license

Diamond House Plumbing

Diamond House Plumbing of Riverside holds California license 830356 (C34 Pipeline, C36 Plumbing, C42 Sanitation System). The CSLB file dated Oct 31, 2026 lists it as active.1 It expires Jan 31, 2028.

Doing business as Diamond House Construction Inc.

Licensed 22 years, longer than 80% of 118 active Riverside plumbing contractors.

Active

Diamond House Plumbing, Riverside

License
830356
Class
C34 Pipeline; C36 Plumbing; C42 Sanitation System
Expires
Jan 31, 2028
Bond
$25,000
Workers' comp
Employee leasing to Oct 1, 2027

CSLB file dated Oct 31, 2026

From the CSLB file dated Oct 31, 2026. Not a consumer report; check the board before you hire.

Has the board taken action on this license?

None in the CSLB file dated Oct 31, 2026. Confirm with the board: CSLB license check

What bond, insurance and workers' comp are on file?

Bond
$25,000Philadelphia Indemnity Insurance Company, from May 12, 2026, continuous
Liability insurance
Not in the CSLB fileCheck with the board
Workers' comp
Employee leasingAce American Insurance Company, from Oct 1, 2026, to Oct 1, 2027

Who is on this license?

Responsible managing officer, CEO and president
Joshua G. MillerSince Jan 9, 2020

What work does this license cover?

Issued Dec 31, 2003. Reissued Jan 28, 2008.

Which other Riverside businesses hold C34 Pipeline?

Plumbing Contractors in RiversideCalifornia plumbing contractors

What should you check before hiring?

What to ask before you hire

  1. Get the license number in writing. The name on the license should match the name on your contract and invoice.
  2. Check the class covers the job. A license for one trade doesn't cover another. California license classes
  3. Ask for a certificate of insurance sent to you by the insurance agent, not handed over by the contractor. How to read a COI
  4. 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.
  5. 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

  1. Don't sign or pay a deposit until the CSLB shows the license active again.
  2. 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.
  3. If work has started, hold further payments, keep the contract, receipts and photos, and file a complaint with Contractors State License Board (CSLB).
  4. Check another contractor. California license lookup

Sources

  1. CSLB License Master (cslb.ca.gov, Oct 31, 2026)
  2. Contractors State License Board (CSLB)