Hammer served as the primary GC for the Archdiocese of Miami for nearly two decades, executing projects across Monroe, Miami-Dade, Broward, and Palm Beach counties. Work ranged from minor renovations to comprehensive rebuilds of religious, educational, and community facilities. School projects included the stabilization and full renovation of the school building on the St. Malachy campus in Tamarac.

Hammer served as prime contractor for multiple Florida counties and municipalities, repairing, renovating, and rebuilding more than 150 public facilities including historic courthouses, city halls, and public safety buildings.

Hammer has performed comprehensive restoration of the McArthur Engineering Building. Hammer is currently an approved University of Miami contractor and was recently awarded a project at the Max Orovitz Building on the UM campus.

Hammer constructed several auxiliary structures as part of the MIA Mid-Field Expansion project — a high-coordination, aviation-sensitive program requiring phased execution and strict compliance with FAA and airport operational standards.