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C M Construction Company
C M Construction Company of San Francisco holds California license 520064 (A General Engineering, B General Building, C36 Plumbing, C51 Structural Steel). The CSLB file dated Oct 30, 2026 lists it as active.1 It expires Oct 31, 2027.
Doing business as Chiang C M Construction Inc.
Licensed 39 years, longer than 94% of 252 active San Francisco plumbing contractors.
Active
C M Construction Company, San Francisco
- License
- 520064
- Class
- A General Engineering; B General Building; C36 Plumbing; C51 Structural Steel
- Expires
- Oct 31, 2027
- Bond
- $25,000
- Workers' comp
- Insured to Oct 1, 2027
CSLB file dated Oct 30, 2026
From the CSLB file dated Oct 30, 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 30, 2026. Confirm with the board: CSLB license check
What bond, insurance and workers' comp are on file?
- Bond
- $25,000American Contractors Indemnity Company, from Jan 1, 2023, continuous
- Liability insurance
- Not in the CSLB fileCheck with the board
- Workers' comp
- InsuredState Compensation Insurance Fund, from Oct 1, 2012, to Oct 1, 2027
Who is on this license?
- Officer
- Stanford ChiangSince Dec 8, 2015
- Responsible managing officer, CEO and president
- Robert C. ChiangSince Oct 29, 1987
What work does this license cover?
Issued Oct 29, 1987.
- A General Engineering
- B General Building
- C36 Plumbing
- C51 Structural Steel
Which other San Francisco businesses hold A General Engineering?
- C S I Customer Service General Contracting IncLicensed since 1986
- Trico ConstructionLicensed since 1987
- Bauer Don & CoLicensed since 1988
- E H J Construction IncLicensed since 1988
- Ng's Landmark Building & Engineering Contractors IncLicensed since 1988
Plumbing Contractors in San FranciscoCalifornia plumbing contractorsGeneral Contractors in San FranciscoCalifornia 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 30, 2026)
- Contractors State License Board (CSLB)