Construction companies · California

Construction companies in Ontario, CA

420 contractors in Ontario with phone numbers, 145 with email addresses. Search the list, unlock the ones you want and start calling today.

Get the Ontario list freeSee a sample
420
businesses
100%
have a phone number
35%
have an email address (145)
—
average Google rating
Sample

A sample of construction companies in Ontario

Twelve of the 420 contractors on the list. Phone numbers and emails unlock in the app — 1 credit per business, both together.

BusinessCategoryRatingWebsitePhoneEmail
Cano Architecture Concrete RepairGeneral Contractor—Yes(909) •••-••••Available
Jeff Kerber Pool Plastering & ProductsGeneral Contractor—Yes(800) •••-••••Available
H B Tool & Die Co.General Contractor—Yes(909) •••-••••Available
Interlink SupplyCarpenter; Carpet and Flooring Contractor; Professional Cleaning Service—Yes(909) •••-••••Available
Rodz Tint TouchConstruction Supplies Store—Yes(909) •••-••••Available
Al's Finishing WoodworksCarpenter; General Contractor—Yes(909) •••-••••Available
Grove Construction HardwareGeneral Contractor—Yes(909) •••-••••Available
Baud-Air Energy Efficiency ServicesConstruction Supplies Store—Yes(951) •••-••••Available
Ruben Display WorldFactory; Construction Supplies Store—Yes(909) •••-••••Available
Hillswood Construction ServiceConstruction—Yes(909) •••-••••Available
Rodriguez Brothers ConstructionGeneral Contractor; Plumber; Sewer Contractor—Yes(909) •••-••••Available
Quality Pumping ServicesGeneral Contractor; Sewer Contractor—Yes(909) •••-••••Available

Showing 12 of 420. Data refreshed October 2026.

The market

What Ontario's contractors look like

0% of rated contractors here hold 4.5★ or better — there is room for businesses that push for reviews.
0 carry a perfect 5.0★ rating; 420 have no rating yet — prime prospects for review and reputation services.
123 (29%) have no website listed — a ready-made list for web design and SEO offers.
16% link a Facebook or Instagram page from their listing.

Most common listings

  • General Contractor113
  • Construction Supplies Store83
  • Home Improvement Service32
  • Construction19
  • Carpet and Flooring Contractor16
  • General Contractor; Painter9

Area codes

  • (909)369
  • (951)14
  • (626)9
  • (562)5
  • (800)4
  • (888)4
Playbook

How to sell to contractors in Ontario

This category covers general contractors, renovation firms, builders, excavators and concrete and framing companies. Projects are larger and longer, and the person you need is usually the owner or the estimator.

Who sells to contractors

  • Construction software (estimating, scheduling, takeoffs, project management)
  • Equipment rental and heavy-equipment dealers
  • Building-materials suppliers
  • Bonding, builder's risk and liability insurance
  • Accounting and job-costing firms
  • Subcontractor and trade recruiting

What keeps owners up at night

  • Cash flow between progress payments
  • Bidding accurately and winning the right jobs
  • Coordinating subs and keeping schedules
  • Labour shortages
When to reach themEarly morning, before site visits, or late afternoon. Winter is planning and bidding season in colder markets, which is a good time to sell software and services.
The angle that worksTalk about margin and schedule risk. "How much did your last job overrun?" opens more doors than "we save you time."
Reaching out in the USB2B cold email is governed by CAN-SPAM: honest headers and subject lines, a physical address and an opt-out you honor. Phone outreach has its own rules, especially for cell phones. Read our CAN-SPAM guide and cold-calling rules before you start.
FAQ

Questions about Ontario contractors leads

How many construction companies in Ontario, CA are in the database?
420 construction companies in Ontario, CA, as of October 2026. 420 of them have a phone number and 145 have an email address.
How much does it cost to get these leads?
Every account starts with 25 free credits. Unlocking a contact (phone and email together) costs 1 credit. The Starter plan is $39/month for 2,500 credits — about 1.6¢ a contact — so the whole Ontario list of 420 costs less than one month of Starter. See pricing.
Can I export the list to a dialer or CRM?
Yes. Unlocked contacts export to CSV, Excel or JSON with phone, email, website, address, category and rating, ready for any dialer or CRM.
Where does the data come from?
From public business listings — the same information contractors publish so customers can find them — cleaned, de-duplicated by phone number and refreshed regularly. Businesses can ask to be removed at any time.

Construction companies in other cities

Los Angeles, CASan Diego, CASan Francisco, CASan Jose, CASacramento, CAFresno, CALong Beach, CARiverside, CAAll construction companies →

Other businesses in Ontario

Law firmsMedical clinicsRestaurantsCafes and bakeriesSalons and spasAuto repair shopsCar dealershipsReal estate officesFinancial advisors and lendersConsultantsEverything in Ontario →

Start calling Ontario contractors today

25 free credits, no card. Search "construction companies in Ontario" and unlock your first 25 contacts.

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