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Just a quick comparison of how big the Bigelow Aerospace space station modules are vs. a typical ISS module, in this case the main US lab on the ISS - Destiny.
Note: Destiny cost $1.2 billion USD.
Bigelow modules will cost a small fraction of that, be more resistant to meteoroid & other impacts, and by design are replaceable and can even disconnect from their station and fly free if necessary. This because they are independently solar powered, have two maneuvering engine clusters and their own avionics. They can even be remotely flown.
The largest shown is the BA-330 at 330 cu/m. There are two larger ones in development: 2,100 cu/m and 3,450 cu/m, both requiring a heavy lift launcher like SpaceX's proposed Falcon X/X-Heavy/XX series (true monsters).
Note: Destiny cost $1.2 billion USD.
Bigelow modules will cost a small fraction of that, be more resistant to meteoroid & other impacts, and by design are replaceable and can even disconnect from their station and fly free if necessary. This because they are independently solar powered, have two maneuvering engine clusters and their own avionics. They can even be remotely flown.
The largest shown is the BA-330 at 330 cu/m. There are two larger ones in development: 2,100 cu/m and 3,450 cu/m, both requiring a heavy lift launcher like SpaceX's proposed Falcon X/X-Heavy/XX series (true monsters).