Ensure that your customers add their street number when they are finalizing their order.
You already have an address field on the checkout page and the address number is the unique number of a street. You could choose to make it mandatory if you want your customers to add their address number in this field when they checkout.
Note: A warning message will be displayed if you make the address number mandatory but the customer doesn’t provide the address number in the field and they will not be able to complete their purchase.
While it is not mandatory anymore, it is still possible to add an address number in the address field. So when checking out your order you will receive your customer address/apartment number as well.