The $350,000 building replaces the 40-year-old hut burned to the ground in March this year.
Wanaka Department of Conservation area manager Paul Hellebrekers and project manager Jerry Murray-Orr described the nine-month replacement project as a "monumental exercise".
"To have the hut open to the public before Christmas is a satisfying achievement for all those involved in the project. This has always been a popular overnight stay for trampers on the Gillespie Pass Circuit Track," Mr Hellebrekers said.
The rebuild project gave Doc staff the chance to reconsider the layout. While it is on the same footprint, it has been reoriented to views of the valley. Decking has been extended and larger windows provide more natural light.
The Siberia hut was built by Scott Atkinson Construction Ltd, which built the Young hut in 2006.
Mr Murray-Orr said the project went to plan and timing.
"The enthusiasm and commitment of the builder made this an enjoyable project," Mr Murray-Orr said.
The hut contains bunk platforms in two bunk rooms and has separate hut warden quarters.
