Casita and addition construction in Las Vegas ranges from $175 to $250 per square foot as of May 2025. Final pricing depends on site conditions including underground utilities, pool proximity, setback requirements, and whether your property is in City of Las Vegas or Henderson jurisdiction. A 1,000-square-foot casita at $200 per square foot creates immediate equity in neighborhoods where existing homes sell for $400-$500 per square foot. Kingdom & Co. recommends a site assessment to identify cost drivers like utility work before final budgeting, helping homeowners explore layout options that minimize expensive obstacles.