Overview

K-Line Group of Companies is a Canadian-owned, family-run high-voltage service provider headquartered in Whitchurch-Stouffville, Ontario, and founded in 1967. The company employs between 500 and 1,000 people and serves the automotive, electric-vehicle, electronics, and construction industries. Its services cover engineering design, construction, commissioning, and maintenance, and it operates an insulator manufacturing division, K-Line Insulators, which produces silicone rubber insulators. In a recent development, K-Line was named an official partner of the Ontario Honda Dealers Indy at Markham.

At a glance

What K-Line Group of Companies makes

K-Line holds ISO 9001 certification and manufactures silicone rubber insulators through its K-Line Insulators division, alongside services in high-voltage engineering, testing of rubber gloves and live-line tools, and temporary power.

Products and capabilities described on the company's own site include LED, Transmission, Emissions, Chassis, Glass (source: k-line.ca).

Certifications

K-Line Group of Companies is associated with the following certifications in public sources. Confirm the certified scope for the specific plant producing your part:

• ISO 9001 — powerandtelecom.ca

Known customers

The counterparties below come from public sources that state the relationship directly. A shared counterparty does not by itself establish a current buying relationship unless the source says so:

• Honda — reported by hondaindy.com

Latest developments

• 2026-08-17 — 🔧 Growing Our Fleet Services to Support Growing Operations | K-Line Group of Companies (linkedin.com)

• 2026-08-11 — Ontario Honda Dealers Indy at Markham - K-Line Group of Companies named official partner of Ontario Honda Dealers Indy at Markham (hondaindy.com)

• 2026-06-29 — K-Line Group of Companies - Employees, Jobs, Stock & Culture | LinkedIn (linkedin.com)

• 2025-10-28 — #poweringexcellence #grandopening #bestmanaged #proudlycanadian | K-Line Group of Companies | 29 comments (linkedin.com)

Company details

K-Line is privately held and family-run, and its reported customers include Honda, with its client base also described as including municipal utilities and power project developers. K-Line Group of Companies was founded in 1967, has an estimated 500-1,000 employees, and is headquartered in Whitchurch-Stouffville, Ontario. On the LightSource stability read it is rated "Established & active": 59 years in operation (founded 1967). Holds ISO 9001 certification(s) per public sources.

Frequently asked questions

What does K-Line Group of Companies make?

K-Line Group of Companies is a Canadian-owned, family-run high-voltage service provider headquartered in Whitchurch-Stouffville, Ontario, and founded in 1967. The company employs between 500 and 1,000 people and serves the automotive, electric-vehicle, electronics, and construction industries. Its services cover engineering design, construction, commissioning, and maintenance, and it operates an insulator manufacturing division, K-Line Insulators, which produces silicone rubber insulators. In a recent development, K-Line was named an official partner of the Ontario Honda Dealers Indy at Markham.

Where is K-Line Group of Companies headquartered?

K-Line Group of Companies is headquartered in Whitchurch-Stouffville, Ontario (12731 HWY-48, Whitchurch-Stouffville, Ontario, L4A 4A7).

When was K-Line Group of Companies founded?

K-Line Group of Companies was founded in 1967.

How big is K-Line Group of Companies?

K-Line Group of Companies has an estimated 500-1,000 employees, with revenue in the $10-50M range (estimated).

What certifications does K-Line Group of Companies hold?

K-Line Group of Companies lists ISO 9001 on its website. Confirm the certified scope for the specific plant producing your part.

Who are K-Line Group of Companies's customers?

Public sources directly reference Honda as a counterparty of K-Line Group of Companies. Confirm current programs with the company, as reported relationships may change.

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Last verified Nov 2026. Is this your company? Request a correction.