Which construction stage involves doors and windows installation?

• A. Siding and exterior finishes
• B. Roofing and insulation
• C. Doors and windows are installed
• D. Subfloor and drywall

Answer: (C)

The main idea is matching the construction sequence to where doors and windows go in—the fenestration stage. This step happens after framing is complete and before interior finishes. At this point the rough openings are checked for level and plumb, the doors and windows are installed, and flashing and weatherproofing are applied to seal around the units. Doing it here ensures the building envelope is tight before drywall and other interior finishes go in, and it allows exterior cladding to integrate properly around the openings. Other stages focus on roofing, insulation, exterior finishes, or interior finish work, not on installing the actual door and window units.