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It comes with a one-year warranty. Rockhill doesn't pretend that a house built by students will be without a few minor flaws. Recently, he acknowledges, there was a problem with the shower at last year's house. But Rockhill keeps a close watch as construction progresses.
"He always tells us, 'Are you going to come back in five years when it doesn't work? Or is it going to be me and the dean who come back?'" Armstrong says.
"So far, we haven't had to do any kind of major repairs or changes," he adds. "It's all actually gone fairly smoothly."
Then he pauses.
"Uh, now that I say that, I'm scared," he says, smiling up at a bunch of students perched on the scaffolding.
"There's some wood behind you. Can you please knock?" Foster says, pointing to a sheet of plywood. "We've only got 28 days to go."
Even the best-run businesses need a little luck.