This was a residential job nearly two years ago, and you can imagine our concerns about a serious collapse in our footing both for an external wall and an internal wall, causing cosmetic damage to drywall and misalignment of both nearby doors. It was a multi-day job and difficult, requiring digging under a deck against the outside wall and digging in the crawl space under the house. A-1 sent a crew that worked quietly (except for the digging tools of course, I mean to say that the workers were not boisterous or personally disorderly in any way) and were mannerly and well organized, and the final lifting process was like beholding a miracle. The developer of the concentric lift and his wife were on-site to observe the installation. Problems were resolved, although I must say with the difficulties I have had with this house, I have been holding my breath for two years. So far, so good. I was very impressed with A-1, I am grateful to them, and I highly recommend them.