Triangle: Detailed Company Information & Corporate Profile
Summary
Triangle is a century‑old independent building firm headquartered in Grand Rapids, Michigan. Founded in 1918, the company specializes in construction management, general contracting, design‑build, project planning, sustainable building and LEED consulting.
With a team of 100 to 200 professionals, Triangle delivers integrated solutions across the Grand Rapids Metropolitan Area. Key staff include Vice President/Executive Director Steve Datema; Vice President of Project Development & Marketing Brianne Pitchford; Vice President Human Resources Nancy Stellini; and Chief Operating Officer Joe Durfee.
Presided by President Patrick Cebelak and Chairman/CEO Craig Datema, the firm operates under SIC code 7380. Revenue ranges between $50 million and $100 million. The organization also benefits from LEED‑AP expertise of Superintendent Mark Buczek and senior consultant Judith Schechtman.
| Triangle Website | triangle-inc.com |
| Phone Number | 1-616-453-3950 |
| Industries | |
| Triangle Headquarters Address | 3769 3 Mile Road NW, Grand Rapids, MI, 49534 US |
| Company Size | 100-200 employees |
| Specialities & Services | Construction Management, General Contracting, Design Build, Project Planning, Sustainable Building, LEED Consulting |
| SIC Code | 7380 |
| DMA Code | Grand Rapids Metropolitan Area |
| Founded | 1918 |
| Estimated Annual Revenue | $50M - 100M |
| Operating Status | Independent Company |
| Updated: | 2026-09-14 |
Estimated Website Traffic
The chart shows a growth in traffic to the triangle-inc.com website. In August, traffic increased to 2421, compared to 2190 in the previous month. The highest traffic in 2026 was recorded in January, reaching 3669 visits.
Workforce Turnover
Number of employees switched from or switched to
Departmental sample breakdown
Length of Employment
Triangle's workforce includes employees across a wide range of tenure levels.
6% have been with the company for 1 to 2 years9% have been with the company for 3 to 4 years6% have been with the company for 5 to 7 years9% have been with the company for 8 to 10 years70% have been with the company for more than 11 years
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Triangle Corporate Information: FAQ
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