The materials costs on this are almost inconsequential if this isn't a rare stone. It's the labor that is the majority of the quote. It's all about the fabrication labor, and that's usually in the $40-$60 range, depending on the nature of the stone and the difficulty of the install. So, maybe 16 square feet here? No fancy edging? Then I'd expect the job to be in the $650-$960 range. (Possible location differences for very high labor markets.) If this was a "one-off" type situation that included trip charges, etc. to make up for the fact that it was such a small job, I'd expect a quote in the range that you gave me. But this isn't a "must meet minimum" situation. They are doing a much larger job that involves a lot of stone being done for you. Unless this is a very delicate stone, or it's only being used here (have to buy the whole slab) and/or you have some fancy edging being done, I'd have an issue with anything over 1K labor being charged for this.

I would mention that these prices are before your GC's markup, so his 20% on top of that could get the quote to be right where yours is.

I'm a little confused. Your drawing says tile but your post says slab. Did you change plans from tile to slab after the drawing? Also, your drawing shows a dimension of 5'2" across the bottom which equals 62", but that appears to cover columns plus surround width of 6" + 44" + 6" which equals 46".

Granite fabrication pricing can vary a lot depending on where you are and also from fabricator to fabricator.

Are there any edge details or such that cause extra fabrication time?

Our fireplace surround is very similar in size. The material for the surround is left over from our kitchen remodel and we bought a small slab for our hearth. Our quote is just labor - $600 for fab and installation. It is very simple - no fancy edges. 8" wide, but that probably doesn't make much difference to the quote. Ours is also taller - 54" - and a bit wider - 52".

Our surround is being fabbed as 3 rectangular pieces - a top and 2 sides because of the size of our remnants. A fabricator might charge more to fab and install a similar surround as one piece. There would be more chance of breakage I think and it might take an extra installer to handle the weight of the surround.

I think that it would have cost more if we used the fabricator who did our kitchen.

...but the quote was for $750. Has anything changed in the plans? (Maybe they ARE peeved at ya!)

There's no justification for their prices. No fancy edges. No nothing. Low cost of labor area.
We just got another quote from a better fabricator after I posted here and it was $684! So, obviously quite a bit less than these people who were trying to rip us off.

Thanks for the responses. Now I have to resolve this issue, wish me luck!

fori no, nothing changed in the plans. My builder drew tile on there just because it didn't matter, the drawings were for the build of our fireplace.
I know they are mad because they screwed up and had to redo 2 bathroom so far (out of 4) and I told them we weren't paying them anything extra since they screwed up.
Like I said, they claim it is because they forgot the hearth. But, we'd had several discussions about the fireplace and hearth before the quote.
We're paying them $17,300 for the kitchen fabrication. Now, granted, we did get blue bahia, but the cost is still high enough that they shouldn't be nickel and diming us on a fireplace installation.

They are just over charging us on every single thing is my conclusion. I don't know how we're going to resolve this problem but I have an email into my GC now and we'll see where it goes.

I just had one buiilt of granite . labor and materisl 9,800 hindred , came out Beautiful