Do I need a permit for an in-ground pool?

Yes — every US jurisdiction requires a permit for in-ground pool construction. Permits run $400–$1,500. Most municipalities also require fence-around-pool building code compliance (typically 48-inch self-latching fence on the property), separate electrical permits for pump + lighting, and a final inspection before water-fill. Add 2–8 weeks for permit issuance depending on jurisdiction and demand season. Pool permits trigger a property reassessment in roughly 30 states — expect a property tax increase of $300–$1,200/year on a typical $60K install.