They have lawyers and you don't so expect this to be dragged out and expensive for you and your rewards, if successful, to not even cover the initial losses ful

They have lawyers and you don't so expect this to be dragged out and expensive for you and your rewards, if successful, to not even cover the initial losses fully, much less the time and money of the suit. The big companies will always win. Better off suing the small construction company or building firm, as you're far more likely to be on even(er) ground with them.