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STO Building Group ranks #7 in ENR’s 2020 Top 400 Contractors - STO Building Group
Structure Tone is a global leader in construction management and general contracting services with offices located in the US, UK, and Ireland. Founded in 1971, the company is among the world’s top twenty construction companies worldwide, responsible for more than $3.5B in annual construction volume.
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STO Building Group ranks #7 in ENR’s 2020 Top 400 Contractors

The firm moved up seven spots from 2019

May 29, 2020 – The STO Building Group moved up seven spots to #7 in ENR magazine’s 2020 Top 400 Contractors, the industry’s premier ranking. With a tremendous portfolio of projects and a growing family of companies, the firm’s revenue and size has increased year after year.

“We shifted our company structure to the STO Building Group a few years ago for this very reason,” says Bob Mullen, CEO. “Through this platform, we can offer our services and expertise to clients across an even broader spectrum of sectors and geographies, while allowing our companies to maintain their individual reputation and heritage.”

STO Building Group also ranked well in ENR’s related breakdown lists:

#2 Domestic Building/Manufacturing

#6 New Contracts

#11 Working Abroad

#9 Telecommunications Sector

#19 Industrial Sector


The STO Building Group family of companies includes Structure Tone, LF Driscoll, Structure Tone Southwest, Pavarini Construction Co., Pavarini McGovern, Govan Brown, Ajax Building Company, BCCI Construction Company, and Layton Construction.

STO Building Group made its first official appearance on the ENR Top 400 Contractors list in 2019, ranking #14. The 2020 rankings reflect the continued growth into new sectors, secured projects of all sizes, and mergers with Govan Brown, Ajax Building Company, BCCI Construction, and Layton Construction in just the last three years.

To see the full list of ENR’s Top 400 Contractors, visit the ENR websiteGo to