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California contractor license

International Waterproofing & Roofing

International Waterproofing & Roofing of San Francisco holds California license 739431 (B General Building, C39 Roofing). The CSLB file dated Oct 30, 2026 lists it as active.1 It expires Aug 31, 2027.

Doing business as Aetna International Inc.

Licensed 29 years, longer than 86% of 1,421 active San Francisco general contractors.

Active

International Waterproofing & Roofing, San Francisco

License
739431
Class
B General Building; C39 Roofing
Expires
Aug 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
$25,000Philadelphia Indemnity Insurance Company, from Nov 21, 2025, continuous
Liability insurance
Not in the CSLB fileCheck with the board
Workers' comp
InsuredState Compensation Insurance Fund, from Oct 1, 2018, to Oct 1, 2027

Who is on this license?

Responsible managing officer
Charles A. SankowichSince Sep 30, 1998
Responsible managing officer
Jack M. ScottSince Sep 24, 2018
CEO and president
Stephen A. SankowichSince Dec 20, 2017

What work does this license cover?

Issued Aug 18, 1997.

Which other San Francisco businesses hold B General Building?

General Contractors in San FranciscoCalifornia general contractorsCalifornia roofing 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 30, 2026)
  2. Contractors State License Board (CSLB)