Sliding door quote

Hi, just wondering if those in the know think this is a fair quote...
Stacker sliding doors, powder coat aluminium. 3650 wide x 2550 high,
including pulling out existing doors and windows, installation of new doors , which willl need to be lifted in with a crane, cleanup and long warranty. Comes to around $4500 inc GST.
I'm not questioning the company involved, they have a good rep I just have no idea about this sort of thing and they are the only quote I've had done. I also realize you get what you pay for quality wise.
Thanks,
Led


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