Ahem...
Gas line have to be boned when the utility is bringing gas in by plastic AND the metallic piping is a retrofit -- it wasn't bonded during the original construction.
Simple static electricity is enough to spark off natural gas. The last thing you want is for an unbonded pipe to build any charge under any condition.
Think lightning, vehicles driving into the home, crazy kids...
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The retro-fit 'fireplaces' I'm seeing are pure electric fakes. Out my way the AHJ has shut down fireplace permits.
Thusly, any home with a pre-existing fireplace pulls a premium price -- generally $5,000 per fireplace!
