I am in the process of getting estimates for a fairly significant repair of my 25-year old garage floor. The floor has settled unevenly (as mich as a three-inch difference from side to side and there is a 2-3" gap in the concrete along the length of one crack where I can see the results of serious erosion below the concrete. (Also looks like original builder skimped on the pour -- only about 2" thick) Both of the concrete services I've talked with so far recommend a complete removal and repour of a new floor given the number of cracks and the seriousness fo the erosion - not to mention the lack of quality in the original. I'm inclined to agree. My questions are: 1) Any general rule of thumb as to what I should be looking at cost-wise for a standard two-car garage? 2) What should I be looking for in the estimate besides costs? 3) One service talked about recycling the old concrete as part of the aggregate for the new floor. The other advised against it. Not sure if this would be OK or not. Any advice would be appreciated.