tl;dr headline - These guys are great: professional, knowledgeable, friendly, and, above all, fair…read more I recommend them enthusiastically and without reservation.
Our large back patio was subsiding on the east edge and had developed a large crack near the center of the slab that ran from front to back. Last year, we took three bids, chose the middle-priced one, and contracted with a urethane-injection company. They were courteous and prompt but did not manage to restore the sagging part of the slab to its original position. In fact, there was no visible improvement at all. Despite the failure, they insisted upon payment, claiming that at least there would be no more subsidence. Predictably, a few months later, we noted additional sinking. In response to my complaints and after far too much cajoling, the representative came back out, said there wasn't anything more he could do, and refused even my generous offer to split the cost in lieu of the full refund to which I thought I was entitled.
We decided to take bids on full replacement of the patio, which turned out to be jaw-droppingly large. We decided to try one more time to jack the sinking half of the patio. I found AAA Concrete Raising on Yelp and contacted Trevor. He came out to have a look, submitted a very reasonable bid, and even followed up with me when life's typical distractions delayed my response to his bid. During this follow-up call, I had the opportunity to discuss my misgivings because of my previous experience. "What do we do if it doesn't work," I asked. Trevor patiently and graciously explained that he had confidence he could do the job and that we could work out something fair for his time and materials if I wasn't satisfied. That was good enough for me and we agreed on a time-frame in which the work would be done.
As he had promised, Trevor called the day before to let us know that he'd be out the following day and even gave us a 2-hour window during which his crew would arrive. They arrived as scheduled and did a truly amazing job. They were able to jack the sagging half of the patio to its original position, nearly close the large center crack, and even leveled an adjacent, separate staircase pad so that there wouldn't be any tripping hazard between the two concrete sections - all for the original amount of the bid. We're thrilled with the results and AAA saved us the substantial cost of a new patio. If you've got some concrete that needs lifting, don't hesitate: just call Trevor. You won't regret it.