I'm getting natural gas service installed and am plumbing in the system. Initially, the only appliance will be a gas water heater. I want to run the mainline and future-proof for new appliance installation later on (e.g. furnace, fireplace, range, etc).
Is there any issue with, during the initial install of the mainline, including several tee fittings stubbed out for future branches to where these appliances will probably be located? Specifically, I need to know if this would be a code violation and/or if the inspector would think me crazy.
Is there a better, more professional, or appropriate way to leave stubbed out ends for future installs?
Code should be in context of my locale: Snohomish County, Washington State, USA.
REF: WA State Residential Code (adopts IRC 2015)