Pool fencing is one of the most consistently regulated fence types in the US, because a pool without a compliant barrier is a well-documented drowning risk for young children. The rules are set locally, not nationally, so this guide covers the pattern most codes follow rather than a specific number you can rely on without checking.
The height most codes cite
A commonly referenced minimum is 4 feet, drawn from model safety codes many local jurisdictions adopt or adapt. Some areas set a higher minimum. This is exactly the kind of number that needs local verification rather than a website’s word for it: check with your building department before finalizing a design.
Gaps matter as much as height
A tall fence with wide gaps between pickets is not much of a barrier to a small child. Many pool codes also set a maximum gap a small sphere (commonly around 4 inches) cannot pass through, both between vertical pickets and at the bottom of the fence near the ground.
The gate is usually the weak point
A pool fence with a code-compliant fence line but a gate that does not self-close and self-latch, or one that swings toward the pool instead of away from it, commonly fails inspection anyway. If you are planning gate hardware, budget for self-closing hinges and a self-latching mechanism specifically, not just a standard hinge and latch set.
Material does not make you exempt
Decorative and see-through does not mean exempt: aluminum, vinyl and mesh pool fencing all still have to meet the same height, gap and gate rules as a solid fence in most jurisdictions.
Plan the material take-off
Once you know your local height and gate requirements, the pool fence calculator and aluminum fence calculator compute posts, panels and hardware for the enclosure. The fence gate calculator breaks down what a gate adds to post count and hardware separately.
Related reading: how much does a wood fence cost for material cost planning generally, DIY vs contractor-installed fence if you are weighing installation options for a code-sensitive project like this one.