What would be involved to convert an electric range to a gas range if the kitchen currently does not have a gas connection?
Some initial factors to consider are the location of the gas meter and existing gas lines.
The house in this video already ran a gas line to the furnace in the garage.
Another factor is the diameter of pipe you need to safely transport the gas. Typically for most gas ranges you need a 3/4" diameter pipe to feed it. If your gas meter is way over at the other end of the house, then you'll need to run a calculation that takes into account the BTUs and distance of travel. Specifically, you will need to take into account the worst case scenario of all gas appliances running at the same time, (i.e. all appliances pulling gas simultaneously). If the pipes are not wide enough for the extreme load, this could pose a hazard.
Running a new 3/4" gas line could cost approximately $700-$800. If you can use the existing gas lines because they are just servicing two other things, then you would just need to put a T and tap out of that for a lower cost of just $200 or so.