LHS had several additions since then due to the city of Lewisville's large growth. In the 2012-2013 school year, Lewisville High School officially opened its new building immediately adjacent to the old building originally built in 1968 yet still on the same campus. The following school year, a new auditorium opened.
Since then, LHS has experienced several enhancements due to Lewisville's considerable growth. In the 2012-2013 academic year, Lewisville High School inaugurated its new structure next to the original building from 1968 that is still on the same campus. The following school year saw a newly built auditorium.