We Build HistoryTM

Since its founding in 1909, I&L has provided quality construction services and has established a standard for performance with integrity that is the foundation of the company’s relationships with customers, architects and engineers, subcontractors and employees. A tradition of accomplishment and a spirit of commitment drive the firm’s operations into the future.

Over 1500 Successful Projects Since 1909

First Retail Project Built in 1954

Our Sector Knowledge

Select Experience

The projects shown are a select few showing Irwin & Leighton's depth of experience and knowledge within the Commercial Construction industry.

Project Experience
New Outpatient Facility, Capital Health System

New Outpatient Facility, Capital Health System

Healthcare & Senior Living, Select Experience

Tenant Fit-Out, Main Event Entertainment

Tenant Fit-Out, Main Event Entertainment

Retail/Hospitality, Select Experience

New Store, Target Corporation

New Store, Target Corporation

Retail/Hospitality, Select Experience

Meet Our Team

As an employee owned, privately held business, we hire the best, brightest and most talented individuals in the business. We pride ourselves on our corporate culture, passion for success and our drive to make every customer our next 50 year customer.

Bringing more value to your vision.
Bold thinking begins where conventional thinking ends.

Latest News

The latest news from Irwin & Leighton including industry trends, the best construction blogs and publications and updates on our latest project news.

Irwin & Leighton completed the renovation of several ±100-year-old buildings for the Doris Duke Charitable Foundation using construction practices kind to the environment, the upgrading of services using LEED approved methods and materials, and habitat regeneration @DorisDukeFdn

Irwin & Leighton provided preconstruction and construction services for the phased renovation of Princeton’s Physics building, Jadwin Hall. The work encompassed ±240,000 SF of office, classroom, laboratory, and mechanical spaces. @Princeton #buildinghistorysince1909

Irwin & Leighton has had the privilege to work with @sanofipasteur, whose U.S. Headquarters are based in Swiftwater, PA. In 2007 I&L increased @sanofipasteur existing space by building a large addition and then a state of the art Vaccine Development BSL 3 Lab in 2008.

Sign Up for News Delivery

Work With Us

As a leading builder, Irwin & Leighton partners with the top subcontractors who have a prime focus on safety and performance.