A couple extra points I forgot to mention! -There is good cell phone service at the hut, the carpark and most of the track. -Remember to bring your own toilet paper!
Did that Track in 84 when the hut was still pretty much brand new . Did alot of Trekking in the Kawekas Ruahenes Tararua Ranges as i kinda work for the dole scheme back in the early 80s bushcraft is what i chose for my work for the dole thing.So we learnt all about bush survival from a government funded work scheme in conjunction with the Ymca Hastings to keep us teenagers busy since jobs in the area were mainly seasonal.
Generally it's acceptable if it's a smaller hut and there's room outside, but if the hut has been booked out online or if it's a great walk hut then you won't be allowed to camp outside it.