Ben meticulously laid out his first sheet-mulch bed in the back yard, only to have to remove it a few days later to make way for sewer excavation.
We had to have a back-flow valve put in where the sewer leaves the house, and in the process it was discovered that our sewer line was cracked where it passed under the garage, so we went ahead and had that replaced as well... better to tear up the back yard before we plant it than after!
We had the south side yard excavated and sealed, and a French drain put in, to prevent water from coming in through the wall.