Lease Amendment: How to Change a Lease Mid-Term
September 16, 2024A lease amendment is a written change to an existing lease's terms, made after the lease is already signed and in effect. Because a fixed-term lease is a binding contract, neither side can change it unilaterally mid-term — an amendment is the mechanism for changing it by mutual agreement, in writing, with both parties signing off.
Amendment vs. addendum — they are not the same thing
The two terms get used interchangeably, but they do different jobs. An amendment changes an existing term of the lease — the rent amount, the lease end date, who is on the lease. An addendum adds a new term the original lease didn't address — a pet policy for a newly approved pet, a parking assignment, a pool addendum. If you're modifying something the lease already says, use an amendment; if you're adding something new alongside what the lease says, use an addendum.
Common reasons to amend a lease
Typical mid-term changes handled by amendment:
- • Adding or removing a tenant (roommate changes, a partner moving in)
- • A mutually agreed rent change
- • Changing the lease end date (see lease extension below — often handled as an amendment)
- • Correcting an error in the original lease (wrong unit number, misspelled name)
- • Changing a policy term both parties agree to revise (e.g., permitting a previously prohibited use)
What a valid amendment must include
To be enforceable and unambiguous, an amendment should state:
- • The parties and the property, matching the original lease exactly
- • A reference to the original lease by date ("the Lease Agreement dated [DATE]")
- • The specific section or term being changed, quoting or clearly identifying the old language
- • The new language replacing it, and the effective date of the change
- • A statement that all other terms of the original lease remain in full force
- • Signatures of the landlord and every tenant on the lease — an amendment signed by only one of two co-tenants generally does not bind the other
Sample lease amendment
LEASE AMENDMENT This Amendment is made on [DATE] between [LANDLORD NAME] ("Landlord") and [TENANT NAME(S)] ("Tenant"), and amends the Lease Agreement dated [ORIGINAL LEASE DATE] for the property at [PROPERTY ADDRESS, UNIT] (the "Lease"). The parties agree to amend the Lease as follows, effective [EFFECTIVE DATE]: 1. Section [NUMBER] of the Lease, which currently reads: "[OLD LANGUAGE]" is deleted and replaced with: "[NEW LANGUAGE]" All other terms and conditions of the Lease remain unchanged and in full force and effect. Landlord Signature: _________________________ Date: __________ Tenant Signature: _________________________ Date: __________
Get every signature, keep every version
An unsigned amendment is just a proposal — it changes nothing. Collect signatures from the landlord and all tenants, give everyone a copy, and store the amendment with the original lease so the full current terms are always reconstructable from one file. If your lease was generated and signed electronically, handle the amendment the same way so the audit trail stays consistent.
Frequently Asked Questions
Can a landlord change a lease without the tenant agreeing?
Generally no — a fixed-term lease binds both parties, and mid-term changes require mutual written agreement. The main exceptions are changes the lease itself already authorizes (like a pre-scheduled rent escalation) or changes required by law.
Does a lease amendment need to be notarized?
In most states, no — signatures of the parties are sufficient for a residential lease amendment, just as they are for the lease itself. A few situations (like very long lease terms in certain states) have recording or notarization rules, so check your state if the lease is unusual.
How many times can a lease be amended?
There's no legal limit, but each amendment should reference the original lease and any prior amendments so the current terms stay unambiguous. If a lease has accumulated several amendments, consolidating everything into a fresh lease at renewal is usually cleaner.