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It depends on the code requirement (if your jurisdiction has enacted a code) for where you live. Where I live the minimum-bury code requirement is one foot. (UPC). I am a little puzzled by your question, though. Minimum-bury requirements are for OUTSIDE the structure, and you say this is a bathroom addition. Crawl-space or slab.....no bury requirement at all.

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18y ago

What else can I help you with?