Insights

Defense Growth Military contract momentum and expanded facilities indicate Day & Zimmermann is a strong partner for government defense programs, with recent multi-billion dollar awards and capability upgrades at munitions depots, creating ongoing opportunities in operations, maintenance, and modernization services.

Nuclear & Tech Strategic partnerships in nuclear and advanced engineering (Deep Fission collaboration, Parsons reactor project, Fast Forward program) suggest a viability pathway for selling specialized design, construction, and staffing support to nuclear facilities and related tech customers.

Facility Expansion Recent facility expansions and capability investments signal capacity for large-scale buildouts and production modernization, presenting opportunities to upsell turnkey construction, plant modernization, and long-term maintenance contracts across new and existing sites.

Public Sector Presence Strong government-focused pipeline with Army collaboration and a broad footprint of workplace locations aligns Day & Zimmermann with public sector procurement cycles, offering recurring bids for O&M, security, and defense-related facilities work.

Industry Standing Recognition in ENR Top 500 and a solid revenue base position Day & Zimmermann as a trusted partner for large-scale engineering and construction projects, enabling cross-sell to integrated services like engineering, staffing, and security across the defense and civilian markets.

Day & Zimmermann Tech Stack

Day & Zimmermann uses 8 technology products and services including Open Graph, Cisco, LinkedIn, and more. Explore Day & Zimmermann's tech stack below.

  • Open Graph
    Content Management System
  • Cisco
    Network Hardware
  • LinkedIn
    Online Community Software
  • Piwik
    System Analytics & Monitoring
  • Google Tag Manager
    Tag Management
  • HTTP/3
    Web & Portal Technology
  • X-Content-Type-Options
    Web & Portal Technology
  • Google Analytics
    Web Analytics

Media & News

Day & Zimmermann's Email Address Formats

Day & Zimmermann uses at least 1 format(s):
Day & Zimmermann Email FormatsExamplePercentage
First.Last@dayzim.comJohn.Doe@dayzim.com
88%
Last.First@dayzim.comDoe.John@dayzim.com
6%
Fir.Last@dayzim.comJoh.Doe@dayzim.com
4%
First.L@dayzim.comJohn.D@dayzim.com
2%

Frequently Asked Questions

What is Day & Zimmermann's phone number?

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You can contact Day & Zimmermann's main corporate office by phone at . For more prospecting data, LeadIQ has access to up-to-date and accurate contact information within our platform. Find, capture, and sync contact data to your CRM and sales tools in one click.

What is Day & Zimmermann's official website and social media links?

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Day & Zimmermann's official website is dayzim.com and has social profiles on LinkedIn.

How much revenue does Day & Zimmermann generate?

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As of July 2026, Day & Zimmermann's annual revenue is estimated to be $1B - $10B.

What is Day & Zimmermann's NAICS code?

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Day & Zimmermann's NAICS code is 23 - Construction.

How many employees does Day & Zimmermann have currently?

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As of July 2026, Day & Zimmermann has approximately 4.2K employees across 6 continents, including North AmericaEuropeAsia. Key team members include Chief Executive Officer: K. B.Vice President Staffing & Recruiting: S. H.Vice President Human Resources: L. M.. Explore Day & Zimmermann's employee directory with LeadIQ.

What industry does Day & Zimmermann belong to?

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Day & Zimmermann operates in the Construction industry.

What technology does Day & Zimmermann use?

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Day & Zimmermann's tech stack includes Open GraphCiscoLinkedInPiwikGoogle Tag ManagerHTTP/3X-Content-Type-OptionsGoogle Analytics.

What is Day & Zimmermann's email format?

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Day & Zimmermann's email format typically follows the pattern of First.Last@dayzim.com. Find more Day & Zimmermann email formats with LeadIQ.

When was Day & Zimmermann founded?

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Day & Zimmermann was founded in 1901.
Day & Zimmermann logo

Day & Zimmermann

ConstructionPennsylvania, United States1001-5000 Employees

Day & Zimmermann is a long-established construction and engineering firm headquartered in Philadelphia, Pennsylvania. It offers a broad range of services, including construction, engineering, operations and maintenance, staffing, and security and defense, serving a global client base of corporations and governments. The company operates across 900+ workplace locations, reflecting its extensive geographic footprint. 

The organization traces its history to more than a century as a family-owned business. In 2026, Day & Zimmermann announced a partnership with Deep Fission to support the construction of a nuclear reactor in Parsons, illustrating engagement in energy and defense initiatives. Day & Zimmermann was recognized in Engineering News-Record's Top 500 Design Firms list for 2026, ranking No. 348.

Section iconCompany Overview

Phone number
Website
dayzim.com
NAICS Code
23 - Construction
Founded
1901
Employees
1001-5000

Section iconFunding & Financials

  • $1B - $10B

    Day & Zimmermann's revenue is estimated to be in the range of $1B - $10B

Section iconFunding & Financials

  • $1B - $10B

    Day & Zimmermann's revenue is estimated to be in the range of $1B - $10B

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