In Belgium

The lease addendum differs from the amendment: the amendment modifies existing clauses, while the addendum adds new provisions without touching the original content. In practice, the two terms are often used interchangeably.

Common situations for an addendum:

  • Adding a clause on pets
  • Adding specific house rules
  • Clarifying the use of garden, parking or cellar
  • Adding an agreement on tenant works

The addendum must be written, signed by landlord and tenant, and registered with FPS Finance.

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Good to know
An addendum cannot contradict a clause of the original lease. In case of contradiction, the most recent document generally prevails, but the judge may assess on a case-by-case basis.

Practical example

After 6 months of tenancy, the tenant wishes to set up a vegetable garden in the communal garden. The landlord agrees and an addendum is drafted: it authorises the use of 10 m2 of garden for the vegetable patch, provides for restoration at departure, and specifies that the tenant bears the costs.