The nature house can be built in the pet house space of the menagerie in a player-owned house. It is an upgrade to a previously built desecrated house. It requires 92 Construction to build and gives 158 experience when built. The player must have a hammer and a saw in their inventory to build it. A crystal saw and orange spicy stew can be used to boost 8 Construction levels, making 84 Construction the minimum skill required to build the nature house.
The nature house can hold all 68 unique one-off pets (minigame, skilling, and boss pets) plus 12 extras. "Extras" include: cats, hellcats, toy cats, pet fish, pet rocks, broavs, an egg, a chair, the mayor of Catherby, and Archibald. Having a combination of extras is possible, but it is not possible to have more than 12 all-combined.