You should receive ACC approval prior to starting any construction. We typically turn around reviews/approvals within a week. However, the turnaround time depends on whether all needed documents have been submitted and amount of complexities of the construction. Generally, turnaround time can be up to two weeks.
Everything required for review is described in the “Waterstone ACC Design Review Checklist”, which you can find along with the “Application for New Home Construction” under the documents tab.