Under the new law, information on Sweden’s housing is collected in a apartment registry of the Lantmäteriet. Your apartment has been allotted a 4 digit number in the register.
The new number does not replace the apartment number you have with Solporten today.
At the entrance of your building is a conversion table that shows you your Solporten apartment number along with the number allotted to you by Lantmäteriet. Your Solporten apartment number is also on your rent bill up on the left. This is an 8 digit number, the first 2 are always zeroes.