Exhibit 99.1 Extra Space Storage Inc. PHONE (801) 365-4600 2795 East Cottonwood Parkway, Suite 300 Salt Lake City, Utah 84121 www.extraspace.com FOR IMMEDIATE RELEASE Extra Space Storage Inc. Reports 2024 First Quarter Results SALT LAKE CITY, April 30, 2024 — Extra Space Storage Inc. (NYSE: EXR) (the “Company”), a leading owner and operator of self- storage facilities in the United States and a constituent of the S&P 500, announced operating results for the three months ended March 31, 2024. Highlights for ...