Duncan Thieme

Duncan Thieme serves as Senior Project Manager for the City of Ridgefield’s Public Works Agency, where he leads the planning, procurement, and execution of critical infrastructure projects centered on transportation, water systems, and public facilities. In this primary contracting role, he oversees the full lifecycle of construction-related acquisitions, ensuring alignment with the agency’s mission of resilient, sustainable public works. His portfolio primarily encompasses complex capital improvement initiatives, including the replacement of aging sewer and water lines, stormwater management upgrades, and multi-use trail development, all requiring precise coordination between engineering, environmental compliance, and construction teams. Thieme maintains collaborative relationships with a broad network of qualified plumbing, heating, and air-conditioning contractors who deliver specialized infrastructure services. While no single vendor dominates his award profile, he consistently engages with firms possessing proven expertise in commercial and municipal-scale HVAC, hydronic systems, and sanitary plumbing installations. His procurement approach emphasizes technical competency, performance history, and adherence to municipal codes, fostering long-term partnerships with vendors who demonstrate reliability and innovation in field execution. Thieme’s contracting activity reflects a strong preference for open competition, with 100% of procurements designated as “No Set-Aside.” This indicates a focus on technical merit and cost-effectiveness over socioeconomic set-asides such as 8(a), HUBZone, or SDVOSB programs. While small business participation is not formally prioritized through targeted set-asides, he remains open to qualified small firms that meet stringent performance and compliance standards. His procurement focus is exclusively aligned with NAICS 238220 — Plumbing, Heating, and Air-Conditioning Contractors — underscoring his deep specialization in mechanical systems for public infrastructure. He procures turnkey solutions for water distribution, wastewater conveyance, and climate-controlled public facility systems, requiring expertise in ASME, IPC, and ASHRAE standards. Thieme’s technical domain expertise lies in integrating modern, energy-efficient mechanical systems into aging urban infrastructure, ensuring operational longevity and regulatory compliance.