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California contractor license
N T K Construction Inc
N T K Construction Inc of San Francisco holds California license 851273 (A General Engineering, B General Building, C31 Construction Zone Traffic Control, C36 Plumbing, HAZ Hazardous Substance Removal Certification). The CSLB file dated Oct 31, 2026 lists it as active.1 It expires Dec 31, 2026.
Licensed 21 years, longer than 71% of 252 active San Francisco plumbing contractors.
Active
N T K Construction Inc, San Francisco
- License
- 851273
- Class
- A General Engineering; B General Building; C31 Construction Zone Traffic Control; C36 Plumbing; HAZ Hazardous Substance Removal Certification
- Expires
- Dec 31, 2026
- Bond
- $25,000
- Workers' comp
- Insured to Jun 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
- $25,000Liberty Mutual Insurance Company, from Jan 1, 2023, continuous
- Liability insurance
- Not in the CSLB fileCheck with the board
- Workers' comp
- InsuredTravelers Property Casualty Company Of America, from Jun 1, 2026, to Jun 1, 2027
Who is on this license?
- Officer
- Sammy C. KwokSince Dec 14, 2004
- Responsible managing officer, CEO and president
- Tin Q. TranSince Dec 14, 2004
What work does this license cover?
Issued Dec 14, 2004.
- A General Engineering
- B General Building
- C31 Construction Zone Traffic Control
- C36 Plumbing
- HAZ Hazardous Substance Removal Certification
Which other San Francisco businesses hold A General Engineering?
- Northside Engineering IncLicensed since 2004
- Master BuildersLicensed since 2004
- Kim Yon W And Associates Design & Construction CompanyLicensed since 2005
- Lee Stacey And Associates Design And Construction CompanyLicensed since 2005
- N B C Construction & Engineering IncLicensed since 2005
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 31, 2026)
- Contractors State License Board (CSLB)