It depends on the size of the like, the capacity of the grill, the capacity of the range and anything else on that line or the entire gas piping system for that matter. It also depends on the number of turns in the line, and the the length of the line.

When dealing with gas, always consult on-site with properly licensed, insured and accredited companies for safety, health and insurance purposes!

IMO

SR

I converted my propane tank Webber grill to a natural gas grill 18 years ago. Have not had a problem with it's operation in present home or my previous home.

Having said that, as noted by others, you would be better off consulting a professional who can evaluate your present gas line size,incoming pressure, potential usage requirements and other variables before proceeding. There's probably a good chance that you might be OK with what you've got but best to check.

Installation manuals for gas appliances give tables of gas pipe sizes over distance. A half-inch line might theoretically be large enough for the grill, but it if it's over a hundred feet of pipe from the meter, and it's a very large barbecue, then maybe not. Also, code requires the gas line to be sized for all appliances on the line and I'm betting the range and grille together will need 3/4" pipe. You can educate yourself by reading the installation manual of the grill you plan to buy, or any gas appliance (definitely any garage heater).

I'm not a professional, but I'm going through a similar exercise with a garage heater which is how I learned this bit. Regarding the pros, note that I hired a very good company to put in gas to my dryer, informing them that I would eventually heat the garage. I am now replacing their pipe because it is not big enough. Make clear to your contractor or consultant any future expansion you might anticipate (tankless heater, fireplace, generator)