Massachusetts Plumbers Journeyman Practice Exam 2025 – All-in-One Guide to Master Your Licensing Test!

The correct answer is indeed that vents can be installed outside a building with the inspector's permission and when other venting methods are impractical. In the context of remodeling and alteration work, regulations often stipulate that any changes to plumbing systems, including vent installations, must be approved by a qualified inspector. This requirement ensures that the work meets safety codes and complies with local regulations.

Additionally, the stipulation that this action is permitted only when other venting methods are deemed impractical allows for flexibility in construction practices. For example, if the existing structure makes internal venting challenging due to design constraints or space limitations, an inspector can authorize the external venting as a viable solution.

The other options do not align with standard regulatory practices. Allowing installation without prior permission undermines safety and code compliance. Completing the work before seeking permission could lead to illegal installations, which would complicate inspections. Lastly, restricting this to newly constructed buildings ignores the realities of remodeling, where adaptations may be necessary for existing structures.