Rockville, MD Swimming Pools & Spas: Hot Tub Rules (2026)

The City of Rockville requires both a building permit and an electrical permit for hot tub and spa installations on residential properties. Applications are submitted through the Inspection Services Division at 240-314-8247. Outdoor hot tubs and spas that hold water deeper than 24 inches must be enclosed by a barrier meeting the same requirements as swimming pool fencing under the International Residential Code as adopted by the city. The barrier must be at least 48 inches high with self-closing, self-latching gates. Electrical installations must comply with the National Electrical Code, including GFCI protection and proper bonding. Hot tubs must be set back from property lines according to accessory structure setback rules, generally a minimum of 3 feet from any lot line. WSSC Water approval may be required for fill water connections and drainage. Maryland state regulations under COMAR 10.17.01 govern public spas and pools, but residential units fall under local building code enforcement. The city inspects electrical connections, structural supports, and barrier compliance before final approval.