B.C.'s infrastructure minister has defended her government's progress on building more schools in Surrey, even as two more schools in the city will shift to a staggered schedule to deal with overcrowding.

Fraser Heights and Sullivan Heights secondary schools will shift to having class times adjusted to start earlier, and end later, in order to squeeze a fifth block of classes into the daily schedule.

That means eight schools in B.C.'s largest school district will have staggered schedules in total…