Why are they constructing a new building while school just started

Today in Mr.Preston’s  class he told us to ask a question and I asked”why are they constructing a new building during school time”. I genuinely asked this beachside the construction of the new building has made it annoying to go home and to be at school. When I’m walking home I have to now go around the construction area because they are blocking off the exit/entrance that Is a direct path to my home. During school time like lunch, break or passing time it is SUPER crowded  and it takes some time to get moving from one side of the school to the other especially now that the new freshman have come, there’s much more freshman now than last year.