Neighbors of the Sidwell Friends School in Northwest are willing to let the sounds of construction consume much of their day — with the hope that a 15-hour schedule eventually will bring back the sound of silence.

The advisory neighborhood commission that oversees the school’s Wisconsin Avenue campus voted Monday to allow work on Sidwell’s middle school addition to run from 6 a.m. to 9 p.m. seven days a week. With that schedule, school officials say, the project should be finished by Sept. 11, the first day of class.