Also be sure you are comparing apples to apples. Is the decking, coping, tile, interior finish all of the same quality? What about equipment sizes? Automation?
With our pool, we chose travertine coping, which was an upgrade to the concrete paver coping. We also went with a company who uses PebbleTec, which I understand to cost more than some other finishes. Then, we went with Pebble Sheen that was slightly more expensive. If we had went with a less expensive finish, all concrete pavers, and had not had the lanai and courtyard re-pavered and screened (that is the two-story section), we would have come in many thousands of dollars lower than what we paid.
When looking at timing, be sure to allow for time for permits. We are almost to Wesley Chapel, but happen to be considered city of Tampa. Our permitting took what felt like forever. Several weeks in reality, but when you are anxious to get started on a project, it’s frustrating to be put on hold over paperwork. Once work finally commenced, we were 2 months from dig to swimming. Dig day was March 14th, and fill day was May 15th.