Reply																		
							Mon 16 Jul, 2018 11:30 am
						
						
					
					
					
						Which is correct:
Finish plumbing, HVAC, and electrical were completed.
or
Finish plumbing, HVAC and electrical were completed.
					
				 
				
						
														
					
													@dabbadabba,
												If HVAC and electrical are a group, then leave out the comma, otherwise include it to make it clear that they are not a group.
Also, your sentence is not grammatical.