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Subcontractors - Structure Tone
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Driving the Project in the Field

Throughout the course of our history, the STO Building Group has developed a strong working relationship with the subcontracting community. By fostering valuable relationships with the trade community, we have been able to successfully complete every project undertaken.

In order to provide the service our clients require, we work with reputable, experienced firms that are both committed to delivering quality and meeting the objectives of a project. As our market coverage has grown (both in terms of project type and geographic coverage) and our workload has increased, we have continuously reached out to the subcontracting community to support our projects and supplement our technical expertise.


To become a subcontractor with the STO Building Group, each subcontractor must demonstrate that it is a viable, productive company. As a condition of working on projects for STO Building Group, the subcontractor must also review, accept and abide by the applicable Supplier Code of ConductGo to Through an extensive prequalification process, we analyze the subcontractor’s past performance, current workload, safety record, and financial stability, among other selection criteria. The prequalification process helps STO Building Group identify the most qualified, reputable subcontractors in the industry.

Required documents to become a subcontractor:

  • Copy of W-9
  • List of company license numbers
  • M/W/LBE information, if applicable
  • Insurance certificate with all applicable endorsements
  • Independent verification letter supporting your EMR for last three years
  • OSHA 300 logs from last three years
  • Safety program manual
  • Current financial statement
  • Bank information
  • Dun and Bradstreet information
  • Surety information (sunshine letter)
  • Three references
  • List of current projects
  • List of recently completed projects
  • Current backlog

Become a Prequalified Subcontractor

To become a prequalified subcontractor for the STO Building Group, please contact the appropriate individual in your nearest location, listed below.

United States

New York Metro


New England




Southeast, Midwest & West



UK & Ireland

For our UK and Ireland Partners, please complete the relevant Subcontractor Prequalification form.

Our Supplier Codes
UK Prequalification Form
Anti-Slavery Statement & Policy
Ireland Prequalification Form

For More Information


Semos Epitropakis 
212.251.9530Go to tel:2122519530