In Practice
A lease addendum is a separate signed page that becomes part of the lease. You use it for things the main lease does not cover or for changes after signing: a pet policy, parking, a roommate swap, a lease term change or a smoke-free rule.
Both sides sign, and it is stored with the lease in the file. Some addenda are required by law, such as lead-based paint disclosure for older buildings. Others come from your own policy. Keep your set of approved forms current and use the same version for everyone in the same situation.
Example: a resident gets approved for a pet. You attach the pet addendum, list the pet details, the fees and the pet rules, and both sides sign before the pet moves in.
The common mistake is agreeing to a change verbally or by text and never papering it. When there is a dispute, the signed documents control. Another is using an outdated form. Review forms with counsel, since requirements vary by state and city.
Keep a checklist of required and optional addenda for each lease type. A missing signature on move-in day is much easier to fix than one found during a dispute.
Lease Addendum: Common Questions
What is a lease addendum?
A signed document added to a lease that adds or changes terms.
Lease addendum vs lease amendment: is there a difference?
They are often used interchangeably. An addendum usually adds terms, and an amendment usually changes existing ones.
Does a lease addendum need to be signed?
Yes. All parties named should sign so it is enforceable, and it should be kept in the lease file.
