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I have a new home with rough-in plumbing in basement and I was wondering if I need a vent down there. I do plan on putting in bathroom.

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if you mean a vent in the plumbing, then yes. wet or dry, the plumbing must be vented. if you mean an air exchange vent to pull moist or smelly air out of the room, then it may or may not be code in your area, but do yourself a favour and just put one in. its always a good idea.

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  • While venting is required in completed plumbing, it's not necessarily required for rough-in plumbing. That was the question.
    – isherwood
    Commented Apr 27, 2023 at 14:14
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if you have open plumbing in there, i would buy rubber caps to seal the pipes until you install the bathroom to keep sewer gases from being able to enter your home. If you are talking about a vent for the plumbing itself to help it drain then you can buy an air admitence valve that will allow air into the plumbing pipes but will not allow the gases to escape to help with drainage. This will save you from having to run a separate vent pipe for the basement

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Vents are commonly left out or incomplete in basement rough-in scenarios. Sometimes there will be a stub left in the floor framing above for later connection where the vent path above becomes inaccessible.

The requirements of individual inspectors vary, of course. When in doubt, ask. Inspectors are people, too. Sort of.

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