On March 15, 2005, Station Casinos announced plans to begin expanding the Red Rock Station before its opening, including an increase in hotel rooms from 400 to 850. The expansion was scheduled to begin in late 2005, with completion expected by late 2006. The expansion and rising construction costs increased the project's estimated cost to $800 million, which would make it the most expensive locals casino ever built in Las Vegas. The project was topped off on March 24, 2005, at which point it was known as Red Rock Resort Spa Casino. "Resort" was added to the name instead of the usual "Station" name used with the company's other properties, in order to denote the Red Rock property's luxury image.