There was no need to tear up the floor of my house as I had feared.
Clothes washer backed up into tub and toilet on one side of house. In my former California home, I had done nearly all my own plumbing work for 30 years, but this Florida home was just too mysterious in the plumbing arena. I had no clue where the outside drain to city sewer was accessible, so decided to eat the cost and call this company, based on a good Angie's report. The result was worth the cost for the work and the education.
He located the problem within a half hour and fixed it in a couple hours. There was no need to tear up the floor of my house as I had feared. He did it all from the roof, using up to 90 feet of snake through a roof vent. He was able to find, clear and flush the blockage point which was somewhere in the floor under my kitchen.
He identified the underground exit point of the sewer on the opposite side of my house, dug it up and opened it to insure the drain was flowing freely. Routed the whole drain system for about an hour. He then replaced the access point with a more usable one. There was an attempt to sell us a lot more drainage service and it was attractive, but it was not a high pressure sales pitch. "No" was accepted without any further pushing.
He also gave us a good deal of advice regarding use of the drains, such as what not to put down the kitchen sink disposal and use of biological rather than chemical drain cleaning treatment. I was very pleased. I also knew that there was no way I could have done the job as effectively even if I had the access to his tools.