Here are the Swedish Ministry of Agriculture regulations translated to English:
Minimum space for snakes and lizards
In animal protection regulations, it is the surface snakes and lizards at least need to have to move in order to feel good. A space for snakes and lizards may well be larger but never smaller than the dimensions in the tables below. Any shelves are not included in the surface.
Spaces for arboreal snakes:
The snake's length from tip of nose to tip of tail The minimum surface Minimum area per snake in group housing Minimum height Up to 35 cm 0.03 m² 0,015 m² 0.17 m 36-40 cm 0.04 m² 0.02 m² 0.2 m 41-50 cm 0.06 m² 0.03 m² 0.25 m 51-75 cm 0.12 m² 0.06 m² 0.4 m 76-100 cm 0.25 m² 0.12 m² 0.5 m 101-125 cm 0.4 m² 0.2 m² 0.65m 126-150 cm 0.55 m² 0.27 m² 0.75m 151-175 cm 0.75 m² 0.37 m² 0.85m More than 175 cm 1.0 m² 0.5 m² 1.0 m
Spaces for terrestrial snakes:
The snake's length from tip of nose to tip of tail The minimum surface Minimum area per snake in group housing Minimum height Up to 30 cm 0.03 m² 0,015 m² 0.1 m 31-40 cm 0.04 m² 0.02 m² 0.12 m 41-50 cm 0.06 m² 0.03 m² 0.15m 51-75 cm 0.12 m² 0.06 m² 0.2 m 76-100 cm 0.25 m² 0.12 m² 0.28 m 101-125 cm 0.43 m² 0.2 m² 0.35 m 126-150 cm 0.63 m² 0.3 m² 0.45m 151-200 cm 1 m² 0.5 m² 0.5 m 201-300 cm 2.15 m² 1.0 m² 0.7 m 301-400 cm 4,1 m² 2.0 m² 1.0 m 401-500 cm 6.8 m² 3.4 m² 1.3 m More than 500 cm 9.0 m² 4.5 m² 1.5 m
If your pet becomes ill
An animal that is sick, injured or showing other signs of illness, an urgent need to get the necessary care. Contact your veterinarian if you notice that your snakes or lizards are not feeling well.
In some cases, you need permission
If you run a business activity with snakes and lizards or you are leasing, storage and feeding of others snakes and lizards on a larger scale, you need permission from the provincial government. An activity is more extensive as it is conducted with six or more terrariums.
Find out what's in your community
Requirements for special permits to keep snakes varies from municipality to municipality. Contact the Environment office in your municipality to find out about the local laws where you live.
Controls
The county administrative boards are responsible for local control of the Animal Welfare Act.