About Us


When you choose Northern Mechanical Contractors, Inc. for your plumbing, heating or fire protection needs, you can be sure that you are choosing an experienced and reliable team of professionals that stresses honesty, integrity and first class workmanship to their valued clients. With over 40 years in the industry, President Michael J. Wielehowski established his own plumbing and heating business in 1975. Throughout the years this business expanded its services to the residential, commercial and institutional markets and went on to become Northern Mechanical Contractors, Inc. in 1989.

Professional Technicians

Each technician employed at Northern Mechanical Contractors, Inc. is registered, bonded and insured throughout the tri state area of Pa, N.J. and Del. All of our technicians receive extensive safety training using OSHA guidelines. They also receive continuing education and training in their craft, and are knowledgeable in local code requirements. This insures a safe and productive environment on all our projects.

Residential, Commercial and Institutional Services

No matter how large or small your Plumbing, HVAC or Fire Protection needs may be, our trained and professional staff of technicians are dedicated to completing your project on time and on budget. With our extensive experience in commercial projects such as shopping centers, apartment buildings, senior housing, health care facilities, food stores, schools and churches, as well as residential projects from single family housing developments to town home developments to very large upscale single family homes, we are ready and willing to serve any type of client of any size or industry.


  • Associated Building Contractors
  • National Fire Protection Association
  • American Fire Sprinkler Association
  • New Jersey State League of Master Plumbers, Inc.
  • Pennsylvania Association of Plumbing Heating and Cooling Contractors