Sun Prairie, WI Swimming Pools & Spas: Fencing & Safety Requirements (2026)

180(C) of the Building Code makes pool enclosure a condition of permit issuance: no permit for an outdoor pool may be issued unless the pool is completely enclosed by a barrier at least 48 inches high, set at least three feet from the pool's edge, and built so that climbing over or through it is difficult. Every gate in that enclosure must be self-closing and self-latching with a locking device and must be kept locked whenever the pool is not in use. Above-ground pools get an alternative path to compliance: the freestanding enclosure can be skipped if the pool has a raised deck running the full perimeter with a railing on its outer edge, or if the pool's own sidewalls are extended upward by a fence to at least six feet above grade, again with a self-closing, self-latching, locked gate and, where a ladder is used, one that can be removed when the pool is unattended.

The same section also sets a 10-foot minimum clearance between any pool and electrical wiring, requires plumbing and water connections to meet the plumbing code, and limits an outdoor pool to no more than 30% of the rear yard while still meeting the accessory-use setbacks from side and rear lot lines. These enclosure standards apply citywide inside the City of Sun Prairie; they are a precondition for permit issuance, not a separate registration scheme, so a pool built without a conforming enclosure has no valid permit.