Insights

Nuclear and Defense Growth Day & Zimmermann is pursuing nuclear reactor projects and expanding defense-focused production through strategic partnerships. This indicates growing demand for integrated construction, engineering, and operations services in highly regulated facilities. Sales opportunities include pursuing defense contracts, providing project delivery, safety and regulatory compliance, and skilled staffing for nuclear and defense programs.

Workforce Partnerships The company collaborates with Fast Forward and Virginia Community Colleges to create direct pipelines for talent into the nuclear sector. This demonstrates a strong model for workforce development and scalable staffing. Opportunities: offer apprenticeship programs, upskilling services, and workforce solutions to clients in government, utilities, and large infrastructure projects that require skilled trades.

Credibility and Reach Day & Zimmermann's long track record, broad service lines, and national footprint enhance credibility for competing in complex, multi-discipline projects across public and private sectors. Opportunities: approach federal agencies and major corporations with proposals highlighting end-to-end delivery, risk management, and lifecycle support.

Capacity Expansion Recent investments to increase production capacity, including expansion of munitions facilities, signal a strategic focus on defense manufacturing readiness. Opportunities: offer capital project services, plant modernization, automation enablement, maintenance and reliability programs, and supply chain support to scale defense production facilities.

Maintenance and Lifecycle Leadership emphasis on maintenance and construction signals an integrated approach to assets and facilities. Opportunities: cross-sell facilities management, preventive maintenance, predictive analytics, and remote monitoring to clients needing reliable operations and long-term asset performance for critical infrastructure, government sites, and industrial plants.

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
  • X-Content-Type-Options
    Web & Portal Technology
  • HTTP/3
    Web & Portal Technology
  • Google Search Console
    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

Where is Day & Zimmermann's headquarters located?

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Day & Zimmermann's main headquarters is located at 1500 Spring Garden Street Philadelphia, Pennsylvania 19130 United States. The company has employees across 6 continents, including North AmericaEuropeAsia.

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.

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 June 2026, Day & Zimmermann has approximately 4.2K employees across 6 continents, including North AmericaEuropeAsia. Key team members include Ceo: H. Y.Chief Executive Officer: K. B.Chief Marketing Officer: M. R.. 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 ManagerX-Content-Type-OptionsHTTP/3Google Search Console.

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

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

Headquarters
1500 Spring Garden Street Philadelphia, Pennsylvania 19130 United States
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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