TJD personnel are currently certified to perform professional engineering services in the following states:

  • New Jersey
  • New York
  • Pennsylvania
  • Massachussetts
  • Ohio
  • Illinois
  • Hawaii
  • Michigan
  • Oklahoma
  • Wisconsin

We are fully capable of obtaining a liscense in other locations. We are LEED accredited.



TJD Engineering is a multi-disciplined engineering firm established in 1992.

We provide engineering consulting and design for HVAC, plumbing, electrical, and fire protection to the greater NY tri-state area.