# Hathaway Dinwiddie

> Hathaway Dinwiddie is a 100% employee-owned general contractor headquartered in San Francisco that has spent more than a century building the landmarks California works, lives, and heals in - from the Salesforce Tower to the Lucas Museum of Narrative Art and more than 10 million square feet of life-science space on the Peninsula. Built on planning, adaptation, and proactive partnership, the firm pairs century-old craft with advanced BIM workflows, LEED-driven sustainability, and an industry-leading safety record.

- **Founded:** 1911
- **Headquarters:** San Francisco, United States
- **Founders:** E. A. Hathaway (Founder, Hathaway and Company (1923)), William S. Dinwiddie, Sr. (Founder, Dinwiddie Construction Company)
- **Team size:** 510 employees (more than one-third LEED Accredited Professionals)
- **Products:** General Contracting, Preconstruction Services, Life Science & Healthcare Construction, Sustainable / Green Building, BIM & Construction Technology
- **Notable:** ENR California Contractor of the Year 2023, Consistently ranked in ENR Top 100 General Contractors, Co-builder (JV with Clark) of the 1,070-ft Salesforce Tower, completed 2018

## Products & services

- **General Contracting** — Full general contracting for commercial, institutional, and complex projects across California and the Pacific Northwest.
- **Preconstruction Services** — Model-based estimating, cost control, scheduling, and constructability planning before ground breaks.
- **Life Science & Healthcare Construction** — Purpose-built lab, biotech, and healthcare facilities; 10M+ sq ft of life-science space delivered on the Peninsula.
- **Sustainable / Green Building** — LEED Gold and Platinum delivery, mass timber, net-zero and embodied-carbon-focused construction.
- **BIM & Construction Technology** — Advanced BIM workflows, Revit, Autodesk BIM Collaborate and Procore-driven coordination and project transparency.
- **Tenant Improvements & Renovations** — Interior construction, tenant improvements, and adaptive renovations for occupied and landmark spaces.

## Achievements

- ENR California Contractor of the Year 2023
- Consistently ranked in ENR Top 100 General Contractors
- Co-builder (JV with Clark) of the 1,070-ft Salesforce Tower, completed 2018
- General contractor for the Lucas Museum of Narrative Art (opening targeted 2026)
- Delivered 10M+ sq ft of life-science development on California's Peninsula
- 100% employee-owned with a legacy spanning more than a century

## Latest updates

- **2025-04** — Kevin O'Riordan named President & CEO; Greg Cosko transitions to Executive Chairman; Sara Carmody promoted to EVP & Northern California Regional Manager.
- **2023-01** — Named ENR California Contractor of the Year 2023.
- **2026-09** — Lucas Museum of Narrative Art, built by Hathaway Dinwiddie, targeting a September 2026 opening.

## Links

- Website: https://hathawaydinwiddie.com
- LinkedIn: http://www.linkedin.com/company/hathaway-dinwiddie
- Twitter/X: https://twitter.com/hdcco
- Facebook: https://www.facebook.com/hathawaydinwiddie

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Profile page: https://yespress.io/hathaway-dinwiddie
Published by YesPress — https://yespress.io
Last updated: 2026-06-02