California Residential Inspector Practice Exam

The under-floor access opening must be at least how wide?

1. 12 inches

2. 16 inches

3. 18 inches

4. 24 inches

The correct answer is: 16 inches

The requirement for the under-floor access opening to be a minimum of 16 inches wide is based on building codes that aim to ensure safety and accessibility for inspections and repairs. An access opening that is at least 16 inches wide provides sufficient space for inspectors or maintenance personnel to enter and move around under the floor without excessive difficulty. This width is also practical for allowing individuals to carry tools and equipment needed for work under the floor, contributing to both functionality and compliance with safety standards. Furthermore, having a properly sized access opening helps reduce the risk of damage to the building or injury to workers as they maneuver through tight spaces. In some cases, wider openings may be preferred, but the minimum standard ensures that access remains feasible. This standard reflects a balance between adequate access and structural integrity. While other choices present larger dimensions, the minimum of 16 inches strikes an appropriate balance for most under-floor spaces, ensuring safety while acknowledging the practical constraints of residential construction.