so the the only pipe in question is the incoming gas supply which goes down into the ground and heads towards the front of the property
that pipe could be anywhere under the ground in your side passage and probably fairly deep
I personally would slabe the whole side area but leave a strip by the house and put in gravel aside from reducing rain splash it visually keeps the gas cupboard and pipework within the gravel section, so your new paving would have a visually nice clean straight edge
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