The process of Raising Sunken Concrete has been around since 1933. You don't hear about it because there is far more profit in breakout and replacement. When you talk to a tear/out guy they will tell you our process doesn't work. We are their competition so what would you expect them to say.
But when they do say that, simply ask how long they are going to warranty their replacement concrete...you'll get all kinds of answers and usually a lot of stuttering and stammering.
I was once told there are the major guarantees when it comes to concrete:
It will Crack, Nobody can Steal it and it Won't Burn.
Save all the mess, expense, noise, 30 day down-time and hassle of tearing out and replacing sunken concrete and use the firm that has been doing it longer and better than anyone,If you are thinking about tearing out and replacing, have you checked the price of concrete lately? Disposal has also skyrocketed because of environmental concerns.
Check out the "Q & A" link. We have new firms entering the market every year and it used to bother me but they never last. In the 14 years I've been in business I've had over 29 competitors, none lasting over 2 years to include the current crop.
And folks, there is a reason they don't last...