Rough-In Inspection

A rough-in inspection is the code-required checkpoint where an inspector verifies that all piping, fittings, and venting are correctly installed, supported, and sized before drywall goes up or concrete is poured. At this stage, water lines are typically pressurized and checked for leaks, drain lines are tested for slope and integrity, and vent stacks are confirmed to rise unobstructed to the roof. Once the inspector signs off, the walls can be closed; if something fails, you tear out drywall instead of pipe.

Timing matters. Rough-in happens after rough carpentry but before finish work, giving inspectors clear sight lines and access to test everything. You need to have water supply isolated, drains cleared of debris, and all vents open at the top. Many jurisdictions require written approval before covering any piping; skipping this step leaves you liable for hidden defects and code violations.

Plan for this inspection early. Coordinate with the GC and inspector to schedule when the job is actually ready—showing up unprepared wastes everyone's time and delays the project. A failed rough-in means callbacks and rework, so get it right the first time.