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-HVAC system design including anything from an estimation to full plans

-Plumbing designs including isometrics and pipe sizing

-Pressure piping designs, normally associated with refrigerant systems for walk in coolers and freezers.

-Gas piping plans, which can be included in either HVAC designs or Plumbing designs

Do I need stamped plans? You should contact the state, county or local building department for this answer. For most commercial projects, if the project will be permitted, stamped plans are probably required. Some simple projects may not require stamped drawings. Residential work, typically, does not require stamped drawings. Ultimately it is up to the local building department.

Should I have drawings completed and stamped if I don't need to? On a simple project, it is probably not necessary if you are hiring a reputable contractor. On a more complicated project, it may be helpful for the contractor to have a drawing of what needs to be done. This can help speed up installation and ordering of materials.   

What are stamped plans? Stamped plans are simply the drawings that a design professional does to communicate to the contractors, inspectors and other trades and professionals what will be done. Once these plans are completed, they are stamped by the engineer or architect.

What is a stamp? The stamp has the name and registration number of the licensed engineer or architect. When an engineer or architect put their stamp on a document they are showing that the document was prepared by them or under their supervision. It does not mean that the document is free from errors, since engineers and architects are human and do make plenty of mistakes. 

How do I know if the engineer or architect is currently licensed? Most state websites have a license look up section where you can see if the engineer or architect is currently licensed.