Bookings not required - first come, first served
Before you go, buy 1 Standard Hut Ticket (blue for adults, yellow for youth) for each night's stay. Put this in the honesty box at the hut. Or buy a Backcountry Hut Pass that gives unlimited use at most Standard and Serviced huts for a 6 or 12 month period.
The track to the hut is a side track off the main Koranga Tawa loop.
A directional sign marks the side track up to the Kahunui hut. From the Tawa hut to the Kahunui hut takes around 3.5 hours. The track has some benched and marked sections, but mostly is walking alongside the river.
You'll need to cross the river several times. A large orange marker indicates the side stream where the Kahunui hut is sited. The hut is 5 mins from the Kahunui stream.
NZTopo50 map sheet: BF40
Grid/NZTM2000 coordinates: E1973103, N5732237