About Us


Is to fulfill the commercial & industrial HVAC & mechanical needs of our customers.

Our customers are our vision and the reason for our existence, and as such, can expect, and will receive the best possible service.

Mechanical Concepts, Inc. values:

  • Perform our trade and craft to the highest standards of our respected industry.
  • Commitment to safety.
  • Meeting schedules and budgets.
  • Integrity, accountability and teamwork
  • Community Involvement  





Indiana Plumbing License Number:



Insurance Broker:


Braman Insurance

Bonding Company:


ShoreWest Surety

General Liability and 
Automobile Insurance Carrier:


Amerisure Companies

Worker's Compensation
Insurance Carrier:


Amerisure Companies
Amerisure Companies

Experience Modification Factor






William D. Neff – CEO & Treasurer
Ralph D. Neff - President
Jason L. Neff – Vice President
Mike Nieto – Secretary


  • Northern Indiana Sheet  Metal Contractors Association
  • Plumbing & Piping Contractors Association of Northern Indiana
  • Mechanical Contractors Association
  • Sheet Metal Workers Union Local 20
  • Plumbers Union Local 210
  • Pipefitters Union Local 597


Mechanical Concepts, Inc. was started in 1988 as a home-based business focused on Commercial Ventilation with a couple of employees. Soon after moving out of the home into a three bay garage we started our Commercial Heating Piping Division. After relocating to our current headquarters which supports over 18,000 square feet of office, shop and warehouse on County Line Road in Gary’s Miller Beach neighborhood Mechanical Concepts, Inc. started our Plumbing Group. At that time we were one of the first commercial companies to provide, plumbing, pipefitting, sheetmetal duct work and service under one corporation.

Today Mechanical Concepts, Inc. employs an average of 70 union craftsmen with sales exceeding 15 million dollars per year.



  • Northwest Indiana Symphony Orchestra Board of Director
  • Pirates, Inc. of Northwest Indiana
  • Meals on Wheels past Board of Directors
  • Merrillville Rotary Club – past President and Board of Directors
  • Hospice of the Calumet – Past President and Board of Directors
  • Porter County Community Foundation Past President and Board of Directors
  • South Shore Arts – Board of Directors