Student requests to move online will be decided on a case-by-case basis.
UCD students are set to receive their timetables on September 7th.
Harris made the comments at a webinar run by the Dublin Chamber this afternoon.
A report conducted by the Parliamentary Budget Office projected a total loss of €328 million across 2019/20 and 2020/21.
College has successfully turned around its dip in the rankings, after falling 44 places last year.
Currently Halls can house some 1,000 students, the majority of which are first years.
The places will be split up among high-demand courses, as well as courses in health and education.
The laundrette closed today, despite students being informed that it would close in early September.
USI President Lorna Fitzpatrick called for an "immediate reduction" in college registration fees.
He made the comments today in an interview with Claire Byrne on RTÉ Radio One.