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Licensed Limited Specialty Contractors in Ontario, California

Updated November 1, 2026 from CSLB's public license file · C-61 Limited Specialty

  • 101licensed limited specialty contractors
  • 97active (Clear)
  • 4%with a suspension
  • 37.6%workers' comp exempt
  • 11.8 yrsmedian time licensed
  • 68.3%corp / LLC / partnership (31.7% sole owner)
  • 5new in the last 12 months
  • —change tracking began November 1, 2026

Ontario is home to 101 limited specialty contractors in CSLB's license file, ranking #1 of 17 San Bernardino County cities for this trade. 96% are Clear.

37.6% report a workers' comp exemption, 1.4 points higher than the statewide figure for limited specialty contractors (36.2%), so many of these businesses say they have no employees. The share with a suspension (4%) is close to the San Bernardino County rate for the same license (4.3%).

The median limited specialty contractor here has held a license for 11.8 years (less than the statewide median of 13), and 5 licenses were issued in the last 12 months.

C-61 licenses are always paired with a D-subcategory that names the specific trade, so check the "D" code on each profile. See the C-61 Limited Specialty guide for what the license covers.

How to check a limited specialty contractor's license in Ontario

  1. Look the company up by name or license number (search Ontario). On the profile, confirm three things: Clear status, the C-61 license for this kind of work, and a contractor's bond on file.
  2. Before any money changes hands, verify the license on CSLB's own lookup. Our data comes from CSLB's weekly file, so a very recent change may not show here yet.
  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.

50 of 101 limited specialty contractors in Ontario

Ontario limited specialty 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 limited specialty contractors in Ontario
Business nameLicense #StatusYearsWorkers' compBond
General Outdoor Advertising 292643 Clear 52 Insured On file
Mc Ginnis Custom Plastics 326086 Clear 50 Insured On file
L M I 471010 Clear 41 Insured On file
Stone Creations Incorporated 494256 Clear 40 Insured On file
R B M Lock & Key Service 517474 Clear 39 Insured On file
Master Building Specialties INC 616533 Clear 35 Insured On file
Ideal Products INC 638386 Clear 34 Insured On file
Trinity Coatings & Hwy Maintenance 653080 Clear 34 Exempt On file
Island Construction & Maintenance 667042 Clear 33 Exempt On file
All Trade Decking 708790 Clear 31 Exempt On file
Holmes Pool Service 709386 Clear 31 Exempt On file
Collins Company 715532 Clear 30 Insured On file
Epoxy Construction Services 721740 Clear 30 Exempt On file
California Door Doc 723866 Clear 30 Exempt On file
Schwab John Newport Beach Deck Waterproofing 733662 Clear 29 Exempt On file
Diversifab INC 740419 Clear 29 Insured On file
Regal Industries INC 740801 Clear 29 Insured On file
Star Hardware INC 766703 Clear 27 Insured On file
T & K Construction 765169 Clear 27 Exempt On file
Island Petroleum Builders INC 776846 Clear 26 Insured On file
Valrose Interiors 782909 Clear 26 Exempt On file
North American Crane Company 790487 Clear 25 Insured On file
Tullos Steven Roy 789563 Clear 25 Exempt On file
A M F I 800845 Clear 25 Insured On file
J & J Industrial Services 814328 Clear 24 Insured On file
Affordable Services 857640 Clear 21 Insured On file
Technical Pool Repair 868779 Clear 20 Exempt On file
Foley Tom Installations Incorporated 914990 Clear 18 Exempt On file
Orange West Plastering 921631 Clear 18 Insured On file
J P Pool Services 925284 Clear 17 Exempt On file
Tr Constructions LLC 926469 Clear 17 Exempt On file
A - C Reglazing 927734 Clear 17 Insured On file
Bright Eye Pool Service 940135 Clear 17 Exempt On file
R & S Overhead Doors of Inland Empire INC 939694 Clear 17 Insured On file
Complete Pool Services 952530 Clear 16 Exempt On file
L D M Construction Services 957993 Clear 15 Insured On file
Louie the Pool Technician 958718 Clear 15 Insured On file
A-1 Delivery CO 971377 Clear 14 Insured On file
Das Commerical Openings INC 975798 Clear 14 Insured On file
G V C O Construction INC 980998 Clear 13 Exempt On file
Forrest Glass & Door 984938 Clear 13 Insured On file
Fresno Shower Door INC 986239 Clear 13 Insured On file
The Amgraph Group 988430 Clear 13 Insured On file
Concrete Protection Systems West INC 988985 Clear 12 Insured On file
Paradise Pool Supplies & Repairs 994024 Clear 12 Insured On file
Best Deal Shutters & Blinds 997420 Clear 12 Exempt On file
R C A Construction Clean Up INC 996848 Clear 12 Insured On file
Axxess Door Corp 999754 Clear 11 Insured On file
Gray David 1008212 Clear 11 Exempt On file
Cesars Pool Repairs 1014923 Clear 10 None On file

See all 101 limited specialty contractors in Ontario

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 limited specialty contractors are in Ontario?

CSLB's current public file lists 101 limited specialty contractors with a Ontario mailing address. 97 have a Clear status, and 93.1% show no issues at all in the file (no suspension, no pending action, bond on file, not near expiration).

What license does a limited specialty contractor need in California?

Look for C-61 on the license. 101 businesses in Ontario hold it. Small jobs under $1,000 with no permit and no employees are exempt; everything else needs a license (details).

How do I check a limited specialty contractor's workers' comp?

Each profile shows the workers' comp type, insurer and policy dates from CSLB's file. Among Ontario limited specialty contractors, 37.6% are exempt (no employees), 58.4% insured and 4% without current coverage. Verify a policy with CSLB's insurer search (step by step).

Related

Limited Specialty Contractors in nearby cities

More limited specialty contractors lists in San Bernardino County

Other licensed trades in Ontario

Guides