a high angle view of a construction site


Oltmans has achieved a significant amount of our success by providing the highest level of preconstruction services available. Our dedicated estimating team’s experience and in-depth industry knowledge, along with the firm’s well-established relationships with the design and subcontractor community, bring the necessary value and foresight to each project ensuring that each product we produce is the best available on the market. We offer a diverse team of estimators on our projects, each with expertise in budgeting, preconstruction, construction, and concrete estimating. We understand that cost control is one of the most crucial areas of responsibility during the estimating process and have well-established systems and procedures to address this.


We do our due diligence to conduct rigorous internal reviews with subcontractor input at each stage of the project, from schematic design (SD) to design development (DD) to final construction documents (CDs) delivery. As a transparent team member, we actively review the project for potential cost or schedule savings with the end goal of producing accurate guaranteed maximum price (GMAX) contracts. These services are a part of our delivery process to ensure that our owners get the best value in today’s marketplace.

Oltmans undergoes the same comprehensive design-assist services for every project regardless of contract structure including:

  • Conceptual budgeting
  • Feasibility and constructability studies and design reviews
  • Solicitation of applicable subcontractor input
  • Realistic scheduling and logistics
  • Material procurement, escalation tracking, and schedule projections
  • Labor requirements, including union, prevailing wage, local hire programs, or diversity, equity, and inclusion (DEI) tracking
Over 90% of Oltmans projects are under GMAX contract Structures
#136 on ENR's Top 400 Contractors List in 2022