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State files updated Oct 31, 2026
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California contractor license

Neilson Roy Plumbing

Neilson Roy Plumbing of Northridge holds California license 874056 (C36 Plumbing). The CSLB file dated Oct 31, 2026 lists it as active.1 It expires Mar 31, 2028.

Doing business as Delaplane Plumbing Inc.

Licensed 20 years, longer than 76% of 43 active Northridge plumbing contractors.

Active

Neilson Roy Plumbing, Northridge

License
874056
Class
C36 Plumbing
Expires
Mar 31, 2028
Bond
$25,000
Workers' comp
Employee leasing to Apr 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
$25,000Western Surety Company, from Jan 1, 2025, continuous
Liability insurance
Not in the CSLB fileCheck with the board
Workers' comp
Employee leasingAmerican Zurich Insurance Company, from Apr 1, 2026, to Apr 1, 2027

Who is on this license?

Officer
Diane M. DelaplaneSince Mar 8, 2006
Responsible managing officer, CEO and president
Francisco OlveraSince May 26, 2026

What work does this license cover?

Issued Mar 8, 2006.

Which other Northridge businesses hold C36 Plumbing?

California 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)