I had a concrete company give a me a quote to install a new garage floor in one of my buildings. He did not preview the job before giving me a price. I agreed to that price. When he came to measure the job i asked him to take a look at another concrete slab i wanted to get done also, he stated is would not be a problem to get it done in the same day. I asked if he wanted to measure it and he said he would do it the day of. He did not give me a price for this work. The day came where he completed the work, both the agreed upon garage floor and the additional concrete slab. He gave me a bill for the work that showed the agreed upon price of roughly $4 Per sq Ft. and a price of $4.50 per sq ft for the additional slab that was less concrete and less finishing. The garage floor was 840 Sqft requiring 16.5 yards of concrete with a price of $3300. The additional slab was 806 sqft and 14 yards of concrete with a price of $3627. How can he change his price per square ft if it was thinner and less finishing? Especially when he never gave me a price or rates for the additional slab prior to completing the work.