ICC B1 question of the day · 14 November 2026

Today's ICC B1 practice question

Building Planning

A den in the center of a large one-story house has no exterior wall and will not be used for sleeping. The plans show no windows or skylights for it. What would let the inspector accept the den without natural light?

Whole-house mechanical ventilation plus artificial light that reaches the illumination level the code setsA ceiling fan in the den and a transom window into the hallway, which has a window of its ownNothing, since every habitable room must have glazing in an exterior wall or in the roof above it, with no exceptions allowedA note on the plans that the den will hold storage only until a window can be added later

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Today's ICC B1 practice question

A den in the center of a large one-story house has no exterior wall and will not be used for sleeping. The plans show no windows or skylights for it. What would let the inspector accept the den without natural light?

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