and don't forget the concrete pad to sit it on or wood deck. that adds up too!
i just poured an 8' sq pad for one. 4" thick used about 35 80# bags of concrete and 4 extra bags of cement. location was too far from the road to either buggy or truck in. mixed on site by hand.
if you are doing a wood deck under it, you MUST design it for 125#/sq ft. that is 3-4 times the usual loading and construction. rule of thumb is 1"/ft of joist span @ 16"o.c. if the girder span is about equal to josit span, 4 plies of 2x.
PM if you need a design.
that house did not enought power going to it, 60A service, so they ended up pulling a new 200A service too! $$$$
dp