Need for shut-off valve for gas line under the slab

Our new kitchen addition has a 30k BTU griddle in the middle and is serviced by an under-slab line.
Shouldn't there be a shut-off valve in the line right before it dives under the slab? Don't codes or common sense call for one?
If the under-slab line develops a leak, the entire house supply would need to be shut down if there isn't a shut off valve.
All the other gas lines in the house are located in the attic.
Any suggestions?
Thanks, Ted
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Not sure if code requires the shutoff, but for peace of mind it's a good idea to install one.
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snipped-for-privacy@yahoo.com wrote:

In our house the shutoff for the grill was inside the garage. Was cause the line corroded out where it went under the slab after 35 years.
LB
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