Trusted for Over 45 Years

Since launching his concrete business in 1980, Mark Leuzzi Sr. has been a trusted fixture in Philadelphia construction—once known for the “backwards K,” and always recognized for skilled craftsmanship, responsiveness, and deep knowledge of the city’s infrastructure. In 2012, he earned his Master Plumber license, specializing in water and sewer line installations and repairs, and founded Mark 4 Plumbing.

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Excavation Expertise—Philadelphia Certified

​In 2025, Mark 4 Plumbing earned the coveted Excavation Contractor license from the City of Philadelphia—a designation requiring rigorous bonding, insurance, and compliance with strict municipal standards. It’s one of the most difficult licenses to attain, and it reflects a level of trust and capability few contractors reach.

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Whether stabilizing a foundation, installing basement egress, or transforming below-grade spaces into livable square footage, Mark brings unmatched experience and full credentials to every excavation project.

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Licensed. Insured. No Subcontractors.

Today, Mark 4 Plumbing upholds the highest standards across all services—concrete, plumbing, and excavation. Mark is fully licensed and insured in each discipline, and manages every project with a consistent, hands-on team. No subcontractors means no compromises: just direct oversight, seamless execution, and peace of mind from beginning to end.