Key Takeaways

  • A rental agreement addendum modifies an existing lease without replacing it. It is legally binding once signed by both landlord and tenant.
  • Addendums are commonly used for storage units, parking spaces, pet rules, guest policies, or rent adjustments.
  • They must remain consistent with the original lease and comply with local landlord-tenant laws to be enforceable.
  • Both parties should sign and date the addendum; unsigned addendums may not hold up legally.
  • Clear terms in an addendum help prevent disputes by outlining rights, responsibilities, and penalties.

Rental Agreement Addendum: Free Legal Form

Rental Agreement Addendum

DATED _____________, 20__ RELATING TO THE RENTAL OF STORAGE ROOMS AND PARKING SPACE

This Agreement entered into this ____ day of ______________ ,20__ by and between [Name] ("Tenant") and [Fict./dba/Owner Name] ("Owner").

What Is a Rental Agreement Addendum?

A rental agreement addendum is a document that adds new terms or conditions to an existing lease without invalidating the original agreement. Unlike an amendment, which changes the original contract, an addendum supplements it with additional details. For example, a landlord may use an addendum to establish rules for pets, assign a parking space, or permit storage use. Once both landlord and tenant sign, the addendum becomes legally enforceable, carrying the same weight as the original lease.

Common Situations Requiring an Addendum

Landlords and tenants often use rental agreement addendums in situations such as:

  • Pet Addendum – permits pets on the premises while outlining rules, deposits, or fees.
  • Guest Addendum – limits the duration of guest stays or requires approval for long-term visitors.
  • Maintenance or Repair Addendum – clarifies responsibility for repairs or upgrades.
  • Rent Adjustment Addendum – records temporary rent discounts, increases, or changes in due dates.
  • Utility Addendum – establishes how utilities will be divided and paid between parties.
  • Sublease Addendum – allows or prohibits subleasing under specific conditions.

These additions help prevent misunderstandings and ensure the rental relationship remains transparent.

FOR STORAGE ROOM:

That for the consideration of rent payments and covenants adherence on the part of the Tenant, the Owner rents to the Tenant, and the Tenant hires from the Owner, for residential use only, the storage room known as ______________ at [Street Address], [City/State/Zip]. Rent is due in advance on the first (1st) day of each month and every month at $___________ per month beginning the first (1st) day of___________. If the first month's rental is adjusted, the rental sum of $____________ has been received by Owner for the period of ________________ to _________________________. The Tenant further agrees if monthly rent is not received on the first (1st) of the month, the Tenant will pay a fee of [Late Fee] of rent to help defray the cost of collection. $______ has been deposited as additional security by Tenant, which will become part of the total security for all agreements.

FOR RESERVED PARKING SPACE:

That for the consideration of rent payments and covenants adherence on the part of the Tenant, the Owner rents to the Tenant, and the Tenant hires from the Owner, for residential use only, the reserved parking space known as ______________ at [Street Address], [City/State/Zip]. Rent is due in advance on the first (1st) day of each month and every month at $___________ per month beginning the first (1st) day of___________. If the first month's rental is adjusted, the rental sum of $____________ has been received by Owner for the period of ________________ to ___________________. The Tenant further agrees if monthly rent is not received on the first (1st) of the month, the Tenant will pay a fee of [Late Fee] of rent to help defray the cost of collection. $______ has been deposited as additional security by Tenant, which will become part of the total security for all agreements.

THIS PARKING SPACE AND/OR STORAGE ROOM IS SUBJECT TO THE COVENANTS AND OBLIGATIONS PROVIDED IN THE RENT AGREEMENT, ADDENDUM RELATING TO RENT, AND RULES AND REGULATIONS, ALL AS IF THIS ADDENDUM WAS INCLUDED THEREIN.

____________________________

Owner

____________________________

Tenant

____________________________

Tenant

____________________________

Tenant

Legal Requirements for Addendums

For an addendum to be valid, it must:

  1. Be in writing – verbal agreements are difficult to enforce.
  2. Reference the original lease – it should clearly state which lease it supplements.
  3. Be signed and dated by all parties – unsigned addendums typically cannot be enforced.
  4. Comply with state and local laws – provisions that contradict housing laws or tenant protections may be invalid.
  5. Be distributed to both landlord and tenant – each party should retain a copy for records.

Courts generally enforce addendums that meet these conditions, provided they do not override statutory tenant rights.

Benefits of Using a Rental Agreement Addendum

Using an addendum offers several advantages for both landlords and tenants:

  • Flexibility – allows lease terms to adapt to changing circumstances without drafting a new lease.
  • Clarity – provides written confirmation of new agreements, reducing misunderstandings.
  • Legal Protection – strengthens enforceability by documenting rights and obligations.
  • Cost Savings – avoids the time and expense of renegotiating or rewriting an entire lease.

By relying on addendums, landlords can maintain consistent lease structures while still customizing agreements as needed.

Frequently Asked Questions

1. How is a rental agreement addendum different from an amendment?

An addendum supplements an existing lease with new terms, while an amendment changes the original lease terms.

2. Is a rental agreement addendum legally binding?

Yes, once both landlord and tenant sign it, the addendum becomes part of the lease and is enforceable in court.

3. Can a landlord add an addendum without tenant consent?

No. Both parties must agree and sign. An unsigned addendum is not valid.

4. What are common addendums landlords use?

Pet, parking, storage, rent adjustment, guest policy, and sublease addendums are among the most common.

5. Do addendums need to be notarized?

Not usually. However, notarization can add an extra layer of legal protection if disputes arise.

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