Wild Luxury added the Finnish-style facility, along with two cold plunge pools and an outdoor shower to its glamping site at Thornham, near Hunstanton, earlier this year.
It has now applied for formal permission for the addition to its wellbeing site, which it says is “modest in both scale and impact”.
A planning statement says similar facilities to the Hidden Sauna Club, as the development is known, are rare in the area,
It adds the business was set up to “to create an accessible wellbeing facility that encourages people to spend time outdoors”.
And it concludes: “The business has created employment opportunities for local people and, in an increasingly digital world, provides a space where people can spend time together in nature without phones, distractions or alcohol at the centre of the experience.”
The sauna operates seven days a week, mainly during the daytime but also sometimes hosts evening sessions for six to eight people at a time.