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Contractor LookoutCalifornia

Licensed General Contractors in Ontario, California

Updated November 1, 2026 from CSLB's public license file · B General Building Contractor

  • 337licensed general contractors
  • 327active (Clear)
  • 3%with a suspension
  • 49.3%workers' comp exempt
  • 10.8 yrsmedian time licensed
  • 60.2%corp / LLC / partnership (39.8% sole owner)
  • 26new in the last 12 months
  • —change tracking began November 1, 2026

There are 337 general contractors based in Ontario in CSLB's current file. 327 (97%) have a Clear status as of November 1, 2026.

49.3% report a workers' comp exemption, 8.4 points lower than the statewide figure for general contractors (57.7%), so many of these businesses say they have no employees. The share with a suspension, 3%, is 2.2 points lower than the San Bernardino County rate for the same license (5.2%).

The median general contractor here has held a license for 10.8 years (less than the statewide median of 15.3), and 26 licenses were issued in the last 12 months.

General contractors hold CSLB's B (General Building Contractor) license, which covers projects that combine two or more unrelated trades. See the B General Building Contractor guide for what the license covers.

How to check a general contractor's license in Ontario

  1. Find the business in the list below, or search all 337 Ontario listings, and open its profile. You want a Clear status and the B classification (a B license can also cover it as part of a multi-trade job).
  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 337 general contractors in Ontario

Ontario general 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 general contractors in Ontario
Business nameLicense #StatusYearsWorkers' compBond
Theilacker Rudolf Carl Contractor 279711 Clear 54 Exempt On file
Fullmer Construction 301814 Clear 51 Insured On file
Crossman Steve 362535 Clear 48 Exempt On file
Hofer Paul B III 368051 Clear 47 Insured On file
Pascal & Ludwig Constructors INC 373525 Clear 47 Exempt On file
Cano Architecture Concrete Repair 414320 Clear 45 Insured On file
Baywood Construction CO 415687 Clear 44 Insured On file
Spec Construction CO INC 419626 Clear 44 Insured On file
Packs Construction 453095 Clear 42 Exempt On file
Anton Construction 461541 Clear 42 Exempt On file
Holbrook Craig E 478551 Clear 41 Exempt On file
Correa Construction 482342 Clear 41 Insured On file
M & R Construction Services INC 508404 Clear 39 Insured On file
Kraemer Klaus Norbert 529570 Clear 38 Exempt On file
Hostetler Construction 532843 Clear 38 Insured On file
New Constructon 532419 Clear 38 Exempt On file
Jorcast Enterprises INC 559980 Clear 37 Exempt On file
Struct-Tech Builders 568920 Clear 37 Exempt On file
Perera Construction & Design INC 585965 Clear 36 Insured On file
Inter-City Energy Systems INC 587709 Clear 36 Insured On file
Herron Construction INC 592387 Clear 36 Insured On file
K A R Construction INC 595709 Clear 36 Insured On file
Comtract Communications INC 598482 Clear 36 Insured On file
Doja INC 597764 Clear 36 Insured On file
B Z B Construction Company 599680 Clear 36 Exempt On file
Parkcrest Construction INC 600254 Clear 36 Insured On file
Ace Engineering INC 613320 Clear 35 Insured On file
Aljohn Builders 616383 Clear 35 Exempt On file
East Los Angeles Community Union the 622252 Clear 35 Insured On file
Alberto Garcia Contractor 624340 Clear 35 Exempt On file
Enriquez Louis Joseph 627102 Clear 35 Exempt On file
Custom Construction 630203 Clear 35 Insured On file
Gorder D M G Construction CO 632348 Clear 34 Exempt On file
Interior Experts General Builders INC 638437 Clear 34 Insured On file
Palomino Jocael 644395 Clear 34 Exempt On file
Austin/Jones Corp 656299 Clear 34 Insured On file
R J P General Contracting 659596 Clear 33 Exempt On file
Spicer Construction 662772 Clear 33 Exempt On file
Island Construction & Maintenance 667042 Clear 33 Exempt On file
Joseph Construction 674654 Clear 33 Exempt On file
C M Construction General Contractors INC 677379 Clear 33 Insured On file
Sierra Construction 681123 Clear 32 Exempt On file
J L G Construction 683195 Clear 32 Insured On file
Chava's Marble & Tile 692159 Clear 32 Exempt On file
Perfect Construction CO 696650 Clear 32 Exempt On file
Yoo Ho Soo 703553 Clear 31 Exempt On file
Castillo Amilcar M 711675 Clear 31 Exempt On file
Wavcomm 724434 Clear 30 Insured On file
Saenz Richard Joe 727122 Clear 30 Insured On file
David Leung 731215 Clear 29 Exempt On file

See all 337 general 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 general contractors are in Ontario?

CSLB's current public file lists 337 general contractors with a Ontario mailing address. 327 have a Clear status, and 89.6% show no issues at all in the file (no suspension, no pending action, bond on file, not near expiration).

What license does a general contractor need in California?

General contractors hold CSLB's B (General Building Contractor) license, which covers projects that combine two or more unrelated trades. 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 general contractor's workers' comp?

Each profile shows the workers' comp type, insurer and policy dates from CSLB's file. Among Ontario general contractors, 49.3% are exempt (no employees), 49.9% insured and 0.9% without current coverage. Verify a policy with CSLB's insurer search (step by step).

Related

General Contractors in nearby cities

More general contractors lists in San Bernardino County

Other licensed trades in Ontario

Guides