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About Us

Appellation Construction Services, (ACS), is a full-service new build contractor and maintenance, modification, and upgrade specialist, located in the heart of the Marcellus/Utica region in Williamsport, Pennsylvania. We deliver quality craftsmanship with schedule-driven project management and have earned an industry leading safety record focused on continuous improvement utilizing best in class management practices. Our early focus was primarily on oil and gas piping systems and remains a specialty. ACS has grown and expanded services into the industrial, healthcare, education, commercial and power generation industries. We have built our business by offering unmatched customer service and support to make all aspects of the project a success.


​ACS has earned a reputation of meeting completion dates and consistently exceeding its customers’ expectations through careful planning.  We have dedicated, innovative and hard-working teams from the main office to project managers, estimators, supervision, craftsmen, fabrication shop crews and most importantly the safety department. Our safety team understands the challenges and demands of today’s construction and has the experience and expertise to make educated timely decisions to solve any problem that may arise and deliver safe, cost effective quality services to our customers. Safety and careful planning are not only directed toward keeping workers safe, but also toward protecting the environment.

ACS is known to exceed customers’ expectations in project controls and turnover documentation. Our team understands the importance of continual updates on project status and time sensitive schedules.  We regularly provide daily reports, weekly schedule updates and "lookaheads" or customize per our customers’ needs.  Turnover documents/as-builts are a critical part of projects in the highly regulated industry our customers operate in which is why our quality control (QC) team carefully and accurately document the turnover information for your project. Our design department takes all data and includes it in a professional bound turnover package when the project has been completed.   

General Contracting Service, Fabrication/ Installation, ASME Construction & Repair, Blasting/Coating/Painting, (Shop & Field), Electrical Construction, (Pipeline Facility, Power & Industrial Facility work. 

Marcellus and Utica Shale Map

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  • Connecticut

  • Delaware

  • Kentucky 

  • Maryland

  • Michigan

  • New Jersey

  • N. Carolina

  • New York

  • Ohio

  • Pennsylvania

  • Tennessee

  • Virginia

  • West Virginia

Servicing the following states

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