The main requirement is for the layout of the interior spaces.

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The category of other economic objects may include additional barn structures, as well as water towers, windmills, etc.

Of course, the main building is the residential building itself. Unlike usa mobile database structures on a plot of land for individual housing construction, a residential building is the main one and a permit must be obtained for its construction. Such a permit is not required for sheds or other outbuildings. The only exception is a water tower, for which a license is issued and a tax is paid.

SNiP for the construction of private houses
A number of requirements are imposed on a residential building, in particular:

fire safety requirements;
norms of hydrological characteristics of the soil;
rules for the construction of load-bearing walls;
material consumption rates;
requirements for location relative to roads and neighboring areas and other structures;
standards for planning the interior spaces of a residential building.
SNiP of an individual residential building with a full list of requirements for the construction of a residential building can be found here SNiP SP 30-102-99 .

So, in order for a building to be considered suitable for habitation, it is necessary: