Boundaries are easy to get wrong by assumption. A house a few blocks from a school can sit outside its catchment while a house farther away sits inside it, so the division's own boundary tool, checked against the exact address, is the only reliable answer.
That comparison matters most for a family choosing between two similar houses partly on the strength of the school assignment, since a listing photo never shows which school a child is actually assigned to.
Confirming the boundary before an offer is written avoids a much harder conversation after possession, when reapplying for a different school mid-year is the only fix left. Get your hand-reviewed valuation from Joel Dyck.