Document background
The Addendum Tenancy Agreement is a essential legal instrument in Belgian property law, used when parties need to modify an existing lease agreement without creating an entirely new contract. This document type is particularly relevant in situations requiring formal documentation of changes to rental terms, such as rent adjustments, lease extensions, or modifications to property use conditions. It must comply with Belgian federal civil law and specific regional housing regulations (Brussels, Flanders, or Wallonia region). The addendum becomes an integral part of the original lease agreement and requires proper registration with relevant authorities when mandatory. Typically used by property managers, landlords, and tenants, this document ensures that modifications to existing lease arrangements are legally binding and properly documented while maintaining the validity of the original agreement's unmodified terms.
