Free Residential Lease Addendum Template

A tenant asks if they can get a dog, or a lease is about to end and both sides want to continue at a new rent. You do not need a whole new lease for either one; you need an addendum, a short signed document that adds to or changes the lease you already have. The trouble with most “addendum” guides is that they describe one without giving you one. This page gives you three you can copy and paste today, a general addendum, a pet addendum, and a renewal addendum, plus the fair-housing and deposit rules that decide whether they hold up.

What a Lease Addendum Is (and How It Differs From an Amendment)

A lease addendum is a separate document that becomes part of an existing residential lease. Strictly speaking, an addendum adds new terms (a pet policy, a parking spot, a renewal), while an amendment changes a term already in the lease (a new rent amount, a corrected date). In everyday practice the words are used interchangeably, and both work the same way: They only bind the parties once everyone who signed the original lease signs the new document too.

The value of an addendum is that it turns a conversation into an enforceable term. “Sure, you can have a cat” is worth nothing in a dispute; a signed pet addendum that names the animal, the fee, and the rules is worth everything. Whatever the addendum covers, it should reference the original lease by date, state exactly what it adds or changes, say that the rest of the lease stays in force, and carry a date and signatures.

General Lease Addendum Template

Use this base for any change that is not a pet or a renewal, such as adding a roommate, a parking space, or a specific house rule. Copy it, fill in the brackets, and both parties sign.

Pet Addendum Template

This is the addendum landlords use most. Be specific: Name the animal, set the money, and lay out the rules. Delete any line you are not using.

Assistance Animals Are Not Pets

This is the rule that turns a pet addendum into a lawsuit when it is ignored. Under the federal Fair Housing Act, a service animal or a documented emotional-support animal is a reasonable accommodation for a disability, not a pet. That means even with a strict no-pets policy or a pet addendum, you generally must allow the animal, and you cannot charge a pet deposit, pet fee, or pet rent for it. HUD’s guidance on assistance animals lays out the process: You may ask for documentation of the disability-related need when it is not obvious, but you must engage in the interactive process rather than issue a flat denial.

You can still hold the tenant responsible for any actual damage the animal causes, and breed or weight limits do not apply to assistance animals. If you are unsure whether a request qualifies, treat it seriously and document your reasoning; a wrong “no” here is a federal fair-housing problem, not a lease dispute.

Pet Deposit vs. Pet Fee vs. Pet Rent

These three are not interchangeable, and mixing them up is where deposit disputes start:

Two rules keep you out of trouble. First, in states that cap the total security deposit, the pet deposit counts toward that cap; California, for example, limits most deposits to one month’s rent under Civil Code § 1950.5, so a separate pet deposit cannot push you over that line. Second, normal wear and tear is never chargeable, even with a pet; light scuffing or worn carpet is on the landlord, while a chewed baseboard or a dug-up floor is damage the deposit can cover. For the move-out accounting, our deposit return letter handles the itemization.

Lease Renewal Addendum Template

When a lease is ending and both sides want to continue, a renewal addendum extends it cleanly and sets the new terms without drafting a whole new lease.

Raising the rent at renewal has its own notice rules, which vary by state and city. Our rent increase notice guide covers the timing, and if you would rather go month-to-month, the month-to-month agreement does the same job with shorter notice on both sides.

Making Your Addendum Enforceable

An addendum only works if it is done right. Reference the original lease by date so it is clearly tied to the contract it modifies. State exactly what changes, in plain language, and confirm the rest of the lease stays in force. Give it an effective date so there is no argument about when the new terms began. Have everyone who signed the lease sign the addendum, and date every signature; a signature without a date is functionally incomplete. Then give each party a copy and keep the addendum with the lease. Verbal side deals are worth nothing in a dispute, so if it is not written and signed, it did not happen. If a tenant later breaks a signed addendum term and will not fix it, the breach follows the same enforcement path as any lease violation, up to an eviction notice.

Common Addendum Mistakes

• Charging fees on an assistance animal. A service or documented support animal is not a pet, so a pet deposit, fee, or rent on it is a fair-housing violation.
• Blowing past your deposit cap. Where the total deposit is capped, a pet deposit stacked on a full deposit can be illegal.
• Not referencing the original lease. An addendum that floats free of the lease it modifies is easy to challenge.
• Only one party signs. Everyone who signed the lease must sign the addendum, and date it.
• Vague language. “Tenant will handle pet upkeep” loses; “Tenant cleans up all waste immediately and is liable for pet damage” wins.
• Verbal renewals. Extending or raising rent by conversation invites a dispute; put it in a renewal addendum.

Frequently Asked Questions

Does a pet addendum override the Fair Housing Act if I have a no-pets policy?

No. The Fair Housing Act requires reasonable accommodations for assistance animals, such as a service animal or a documented emotional-support animal, regardless of a no-pets policy or a pet addendum. You must allow the animal and cannot charge a pet deposit, fee, or rent for it. The addendum governs pets; the Act governs disability accommodations.

What is the difference between an addendum and an amendment?

An addendum adds new terms to a lease, while an amendment changes a term already in it. In practice the words are used interchangeably and both work the same way: They take effect only when everyone who signed the lease signs the new document. What matters is that it references the original lease and is properly signed.

How much notice do I need to give before a renewal changes the rent?

That is set by your state and city, not by the addendum. Many places require 30 to 60 days’ written notice before a rent increase or non-renewal, and rent-controlled cities add their own rules. Give the required notice first, then paper the new terms in a renewal addendum.

Can I charge different pet fees for a small dog versus a large one?

Generally yes. You can set fees by size, weight, or type of animal as long as the criteria are reasonable and applied consistently to all tenants. Document the criteria in the addendum. This does not apply to assistance animals, which cannot be charged pet fees at all.

Is “pets allowed” in the main lease enough, or do I need a pet addendum?

A bare “pets allowed” is not enough, because it sets no rules, fees, or liability. A pet addendum names the animal, sets the money, and spells out the responsibilities and removal terms, which is what makes the arrangement enforceable if there is ever a problem.

Does a pet deposit count toward my state’s deposit cap?

Where your state caps the total security deposit, yes. California, for example, caps most deposits at one month’s rent, so a pet deposit has to fit inside that limit rather than sit on top of it. Check your state’s cap before setting the amount.

Elena Rodriguez

Elena Rodriguez writes about real estate and landlord-tenant law for ClearLegalTips. She focuses on making leases, security deposits, and rental rules understandable for tenants and small landlords handling them without a lawyer.