📋 Free Lease Addendum Forms
Complete Collection of Lease Modification & Amendment Forms — All 50 States
What Is a Lease Addendum? A lease addendum is a legal document that modifies or adds to an existing lease without rewriting it. Addendums authorize pets, assign parking, add occupants, change terms, or establish new rules — while keeping the original lease intact. Both parties must sign for it to be legally binding. See also: Lease Termination Laws • Security Deposit Laws • Rent Increase Laws
🐾 Pet & Property Policy Addendums
Pet Addendum Agreement
Comprehensive pet policy with breed restrictions, insurance requirements, deposit/fee/rent options, and liability protection. Works for all pet types.
Create Addendum →No-Smoking Addendum
Prohibit smoking, vaping, and marijuana on property. Includes violation penalties ($250–$500+), damage charges, and enforcement provisions.
Create Addendum →Pet Policy Acknowledgment
Standalone pet policy for new leases. Covers 2 pets with complete rules, deposits, fees, and tenant responsibilities.
Create Policy →🏠 Property & Occupancy Addendums
Parking Addendum Agreement
Assign specific parking spaces, garage access, or additional parking fees. Includes vehicle details, space assignments, and enforcement rules.
Create Addendum →Roommate Agreement
Add additional occupants to existing lease. Covers rent splits, utilities, house rules, and obligations. Always screen before signing.
Create Agreement →Lease Amendment Form
General-purpose amendment for any modification. Change rent, add occupants, or update any lease provision. See rent increase laws before adjusting rent.
Create Amendment →⚖ Enforcement, Financial & Renewal Forms
Lease Violation Notice
Document lease breaches and provide opportunity to cure. Covers unauthorized pets, noise, damage, illegal activity. Creates paper trail before eviction.
Create Notice →Lease Renewal Agreement
Extend existing lease for additional term. Update rent, modify terms, and establish new lease period without writing an entirely new lease.
Create Renewal →👑 Guarantor Forms
Cosigner Agreement
Add guarantor to lease for tenants who don't meet income or credit requirements. Establishes joint and several liability. Screen the cosigner too.
Create Agreement →Screen Before Signing Any Addendum
Adding occupants? Allowing pets? Authorizing a new roommate? Screen first — credit reports, background checks, and eviction history delivered in minutes.
🔍 Order Screening Report →Complete Guide to Lease Addendums
A lease addendum is a legal document that modifies, adds to, or changes specific terms of an existing lease. Unlike a new lease, an addendum preserves the original agreement while updating particular provisions. Addendums are equally binding as the original lease — both landlord and all tenants must sign.
Addendum vs. Amendment: The Practical Difference
An addendum typically adds new terms not in the original lease (pet authorization, parking assignment). An amendment modifies existing terms (rent increase, occupant change). In practice, both terms are used interchangeably. What matters: both parties sign, the original lease is referenced by date and address, and changes are explicitly stated.
Essential Elements of a Valid Addendum
- Reference the original lease: “Addendum to Lease Agreement dated [date] for property at [address]”
- All parties must sign: If lease had 2 tenants, both must sign the addendum
- Be explicit about changes: No ambiguity — “pet deposit of $500 due within 10 days” not “a deposit will be collected”
- State effective date: When do the new terms take effect
- Confirm remaining terms: All other lease terms remain in full effect
Can Tenants Refuse to Sign?
Yes. Addendums require mutual consent. You cannot unilaterally impose new terms mid-lease. If a tenant refuses a reasonable addendum, you can enforce existing lease terms but must generally wait until renewal to implement changes. Most states don't allow mid-lease rent increases unless the original lease specifically permits them. See rent increase laws by state.
⚖ Legal Disclaimer
These forms are provided for informational purposes only and do not constitute legal advice. Landlord-tenant laws vary significantly by state, and some jurisdictions have specific requirements for lease modifications, rent increases, pet fees, or occupancy changes. Addendums must be properly completed, signed by all parties, and comply with existing lease terms and applicable law. Rent-controlled jurisdictions may restrict mid-lease rent increases, pet fees, or require notice for adding occupants. Consult a qualified attorney before implementing lease addendums in rent-controlled areas. See our editorial standards.
