My friend is having a pool built with a concrete slab (cool-deck). A portion of the cool deck may (at a later time) have a bar/bbq built on top of it. To accomodate this, the pool contractor has recommended that a thicker slab be poured in this area, to hold the additional weight. This sounds reasonable so far, but I'm questioning the additional cost he is trying to charge my friend.
The plan calls for the cool deck to be a 4 inch slab w/ 6" x 6" - 10/10 W.W.M. & 8" x 8" FTG. w/ 1- #5 rebar. The thicker slab is to be 8 inch slab w/ 6" x 6" - 10/10 W.W.M. & 8" x 8" FTG. w/ 1- #5 rebar.
It seems (to me) that the only difference is the thickeness of the slab (no additional steel, etc), but the contractor is asking for an additional $8 per square foot for this area (which is about 120 sq feet). I understand that the additional concrete costs something, and the ground (loose Florida sand) will have to be dug a few inches deeper, but the cost seems high to me....
Is my friend being taking advantage of? Any opinions will be appreciated.