Lease addendum
Page last updated: August 22, 2026 · How we source & update
An add-on document that changes or adds terms to a lease you have already signed. In practice it carries the same weight as the lease itself once both sides sign. It does not mean a landlord may add terms alone mid-tenancy, and a verbal promise never written into an addendum is hard to enforce later.
Why does this matter to renters?
It's binding like the lease, so read addenda carefully before signing.
What does this look like in practice?
A pet addendum or a parking addendum modifies your original lease.
What can I do if this comes up?
Read any addendum as carefully as the lease itself, because once signed it usually carries the same weight. Ask for changes in writing before you sign, keep a signed copy of every page, and do not sign an addendum that contradicts a protection your state gives you without asking legal aid first.