Independent site · Not affiliated with CSLB or any state agency
Contractor LookoutCalifornia

Licensed Boiler and Steam Fitting Contractors in San Francisco, California

Updated November 1, 2026 from CSLB's public license file · C-4 Boiler, Hot Water Heating and Steam Fitting Contractor

  • 45licensed boiler and steam fitting contractors
  • 43active (Clear)
  • 4.4%with a suspension
  • 28.9%workers' comp exempt
  • 28.1 yrsmedian time licensed
  • 82.2%corp / LLC / partnership (17.8% sole owner)
  • 2new in the last 12 months
  • —change tracking began November 1, 2026

San Francisco is home to 45 boiler and steam fitting contractors in CSLB's license file, the most in San Francisco County. 95.6% are Clear.

28.9% report a workers' comp exemption, 12.6 points higher than the statewide figure for boiler and steam fitting contractors (16.3%), so many of these businesses say they have no employees. The share with a suspension (4.4%) is close to the San Francisco County rate for the same license (4.4%).

The median boiler contractor here has held a license for 28.1 years (more than the statewide median of 26.1), and 2 licenses were issued in the last 12 months.

In California this work generally calls for the C-4 Boiler, Hot Water Heating and Steam Fitting Contractor license (or a B license when it is part of a larger multi-trade job). See the C-4 Boiler, Hot Water Heating and Steam Fitting Contractor guide for what the license covers.

How to check a boiler contractor's license in San Francisco

  1. Find the business in the list below, or search all 45 San Francisco listings, and open its profile. You want a Clear status and the C-4 classification (a B license can also cover it as part of a multi-trade job).
  2. Re-check the same number on CSLB's Instant License Check the day you sign; our copy is refreshed weekly and 4.4% of San Francisco listings here already show a suspension.
  3. Match the license holder's name to the name on the written contract and the person you meet. Ask for proof of workers' comp if anyone besides the owner will work on site. Hiring checklist.

All 45 boiler and steam fitting contractors in San Francisco

San Francisco boiler and steam fitting contractors sorted with Clear licenses first, then by years licensed. Badges reflect CSLB's file dated November 1, 2026, not a rating of anyone's work.

Licensed boiler and steam fitting contractors in San Francisco
Business nameLicense #StatusYearsWorkers' compBond
Anderson Rowe & Buckley INC 91594 Clear 79 Insured On file
Reichel C R Engineering CO INC 169169 Clear 69 Insured On file
Cornely Company 171203 Clear 69 Insured On file
Abco Mechanical Contractors INC 209064 Clear 64 Insured On file
Sand Joseph C CO INC 280333 Clear 53 Exempt On file
Demakas Plumbing & Heating INC 349523 Clear 48 Insured On file
Ayoob & Peery Plumbing CO INC 392967 Clear 46 Insured On file
Ranger Pipelines Incorporated 417996 Clear 44 Insured On file
Central Mechanical CO 482746 Clear 41 Exempt On file
Gaehwiler M Construction INC 510649 Clear 39 Insured On file
Trico Construction 510127 Clear 39 Insured On file
Chen's H Plumbing 516866 Clear 39 Exempt On file
Yum's Mechanical CO INC 583839 Clear 36 Insured On file
Leong D & S Associates INC 618294 Clear 35 Insured On file
Brown J E Company Mechanical Contractors 658273 Clear 34 Insured On file
Hetherington Mechanical & Plumbing 664033 Clear 33 Insured On file
Alpha Bay Builders INC 668616 Clear 33 Insured On file
S F Garage Company INC. 684863 Clear 32 Exempt On file
O'keeffe Mechanical CO INC 687041 Clear 32 Insured On file
Loughran Construction INC 727764 Clear 30 Exempt On file
Bacon Plumbing CO INC 728650 Clear 30 Insured On file
Gilmore E B & Sons Mechanical Services INC 740278 Clear 29 Insured On file
O'brien Mechanical INC II 754629 Clear 28 Insured On file
E D Plumbing 794264 Clear 25 Exempt On file
Aremtech INC 795570 Clear 25 Insured On file
Ace Plumbing & Rooter 829071 Clear 22 Insured On file
Dmg Enterprises INC 833910 Clear 22 Insured On file
Clear Flow Plumbing 875153 Clear 20 Insured On file
Malcolm Plumbing & Mechanical 885680 Clear 20 Insured On file
R E M Boiler and Plumbing 902830 Clear 19 Exempt On file
Gb Mechanical HVAC CO 918728 Clear 18 Insured On file
Romeo P J Plumbing & Heating 930663 Clear 17 Exempt On file
Pacific Radiant Heat & Construction 952071 Clear 16 Insured On file
T M Mechanical Company INC 961018 Clear 15 Insured On file
Chen B H INC 973578 Clear 14 Insured On file
Orebend Bldrs INC 1017529 Clear 10 Insured On file
Daniele A & Company 1076542 Clear 5 Insured On file
Ranger/Liffey Jv 1079350 Clear 5 Exempt On file
Steven Bailey Plumbing and Rooter 1122760 Clear 2 Insured On file
The Steam and Hot Water Company 1123889 Clear 2 Insured On file
Ranger Pipelines INC & Cts Jv 1143222 Clear 1 Exempt On file
Fmp Mechanical LLC 1158455 Clear <1 Insured On file
Heises and Interlock 1163898 Clear <1 Exempt On file
United California HVAC 1071891 Susp: Secretary of State 5 Exempt On file
Boilers and Heating Systems Specialist LLC 1093232 Susp: employee/worker bond 4 Exempt On file

Source: CSLB public data · Updated November 1, 2026 Status can change at any time. Verify on CSLB's Instant License Check.

Frequently asked questions

How many licensed boiler and steam fitting contractors are in San Francisco?

CSLB's current public file lists 45 boiler and steam fitting contractors with a San Francisco mailing address. 43 have a Clear status, and 93.3% show no issues at all in the file (no suspension, no pending action, bond on file, not near expiration).

What license does a boiler contractor need in California?

In California this work generally calls for the C-4 Boiler, Hot Water Heating and Steam Fitting Contractor license (or a B license when it is part of a larger multi-trade job). Any job of $1,000 or more in labor and materials needs a licensed contractor. Read our guide to the $1,000 rule.

How do I check a boiler contractor's workers' comp?

Each profile shows the workers' comp type, insurer and policy dates from CSLB's file. Among San Francisco boiler and steam fitting contractors, 28.9% are exempt (no employees), 71.1% insured and 0% without current coverage. Verify a policy with CSLB's insurer search (step by step).

Related

Other licensed trades in San Francisco

Guides