How to Write an Iron-Clad Lease Addendum
By PropsManager Team | Dec 17, 2025
How to Write an Iron-Clad Lease Addendum
An addendum is a separate document attached to the lease that addresses specific topics.
Common Addenda
- Pet Addendum: Specifies breed restrictions, pet rent, and rules (e.g., "must be on leash").
- Smoking Addendum: "No smoking of any substance inside the unit or within 25 feet of the building."
- Crime-Free / Drug-Free Addendum: Explicitly states that illegal activity is grounds for immediate eviction.
- Mold Addendum: Requires tenant to ventilate the bathroom and report leaks immediately.
Writing Tips
- Be Specific: Don't say "Keep the yard clean." Say "Grass must be kept under 6 inches high."
- Reference the Lease: "This addendum is incorporated into the Lease Agreement dated..."
- Signatures: Both parties must sign the addendum.
Conclusion
Addenda clarify expectations and close loopholes. They are essential for a robust lease agreement.