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Irwin & Leighton’s current King of Prussia, Pennsylvania headquarters are located on what was once Mr. Irwin’s (one of our founders) Farm Estate

We Build History™

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.

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