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Free Contract Addendum Template: What to Include

Navigating the complexities of contracts can seem like an uphill battle, especially when significant changes arise. Enter the contract addendum, a valuable tool to amend agreements without altering the original contract’s entirety.

This guide will explore the whys and hows of contract addendums and provide a handy template for your convenience.

What is a Contract Addendum?

A contract addendum is a document used to make alterations or additions to an existing contract without voiding or rewriting it. It’s a separate agreement attached to the existing contract, specifying the changes all parties agreed upon. These changes can range from simple modifications, like changing an address or correcting a typo, to more significant adjustments, such as extending the contract’s term or adding responsibilities. An addendum should not contradict the current contract’s purpose or principles but rather refine or supplement it.

When to Use a Contract Addendum Template

A contract addendum template comes into play whenever there is a change to a signed contract, and all parties agree to the modifications. You might use a contract addendum when there’s an error in the original contract, a change in the scope of work, alterations in the timeline, changes to payment terms, or updates required due to unforeseen circumstances.

A contract addendum provides a structured framework for incorporating modifications while preserving the integrity of the first agreement. Remember to consult a legal professional before altering legally binding documents, and use secure, efficient signing solutions like Signaturely for an effective signing process.

DISCLAIMER: We are not lawyers or a law firm and we do not provide legal, business or tax advice. We recommend you consult a lawyer or other appropriate professional before using any templates or agreements from this website.

What to Include in a Contract Addendum

An effective addendum ensures clarity, avoids misunderstanding, and preserves the integrity of the existing contract. While the specific content may vary based on the contract’s nature and the amendments required, there are key elements that you should generally include to maintain legal validity and effectiveness.

Basic Information

At the outset of your contract addendum, you should include essential details identifying the parties involved and the agreement. These details include the full names of the contracting parties, just as they appear in the contract. Also, have their roles in the agreement (e.g., “seller,” “buyer,” “lessor,” “lessee,” etc.) and their complete contact information, including their address.

Moreover, specify the date of the amending agreement and the contract title. These details facilitate a clear link between the addendum and the initial deal, ensuring no confusion about the modified contract.

Contract Background

After stating the basic information, provide a brief background of the original contract. This background should summarize the existing agreement’s purpose and intention and clearly note that all parties aim to modify the agreement through this addendum. This context sets the stage for introducing the changes and illustrates the continuity between the initial contract and the addendum. In some cases, your addendum might require additional valuable consideration to form a binding contract. 


The heart of your addendum lies in the amendments section where you spell out the changes, additions, or deletions made to the original contract. It’s crucial to articulate these changes with precision and clarity.

Each amendment should be listed separately, preferably with bullet points or numbers for easy reference. Describe in detail the clauses that are being modified and specify whether they’re being replaced, deleted, or supplemented.

For example, if you’re changing the delivery date in a sales contract, indicate the clause that mentions the original date and clearly state the new date. If you’re adding a clause, specify its exact wording and where it fits into the original contract. If a clause is to be deleted, mention it and its location in the existing agreement.

This level of detail helps to eliminate ambiguity and potential disputes. It ensures that all parties are on the same page about what’s being changed and how it affects the amending agreement.

General Terms

The devil is in the details – and this phrase holds particularly true for the general terms section of a contract addendum. This section helps safeguard the interests of all parties and fortify the contract against potential disputes and legal challenges.

Here, you’ll confirm that the addendum doesn’t override or negate the rest of the original contract. Unless explicitly specified in the addendum, the other provisions of the original contract remain unchanged. This clarification prevents any party from claiming that the addition invalidated other contractual terms.

Next, address the future amendment provisions. You should mention that any future changes to the contract require a new addendum or amendment document. This provision ensures that the parties can’t arbitrarily change the agreement without proper documentation and consensus.

Finally, explore the termination clause. Specify whether the addendum can be terminated separately from the main contract or if they both stand or fall together. This clause is especially crucial in long-term or complex agreements where unforeseen circumstances might necessitate termination.


The signatures section is one of the most crucial parts of your contract addendum. For your addendum to be legally binding, it must be signed by all parties in the amending agreement.

However, traditional pen-and-paper signatures can be time-consuming and inconvenient in today’s digital world. This is where Signaturely steps in – offering a quick, easy, and legally binding way to get your addendum signed digitally.

With Signaturely, each party can sign the addendum securely from anywhere in the world. The platform ensures that every signature is verified and legally compliant. Plus, it timestamps each signature, providing an accurate record of parties agreeing to the changes in the addendum.

Including all these elements in your contract addendum ensures that it’s not only legally sound but also helps maintain positive business relationships by ensuring transparency and mutual understanding between parties. As you move to modify an existing contract, remember that an addendum is not just a casual note or a verbal agreement – it carries the same weight and legally binding power as the agreement. So, take time to draft it carefully, and once ready, use a trusted e-signature solution like Signaturely to finalize it efficiently and securely.

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Contract Addendum Template

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How Do You Write a Contract Addendum?

Drafting a contract addendum does not need to be an uphill task. Start by identifying the exact parts of the original contract that need modifications. Then, reference these parts clearly in your addendum to avoid any ambiguity.

Once you’re clear on the changes, a contract addendum template can be a lifesaver. A template helps ensure that all critical elements are included and properly structured. You can find reliable templates online or create one that suits your unique needs.

Remember, an addendum should be concise and clear. Stick to clear, simple language to express the amendments – legal jargon can make it harder for all parties to understand the changes. Lastly, review the addendum carefully to ensure it doesn’t contradict any part of the existing contract.

When you’re ready to sign, consider a digital platform like Signaturely. It’s fast, secure and eliminates the need for time-consuming in-person signings or the risk of misplaced documents.

FAQs About a Contract Addendum Template

Let’s address some common questions about contract addendum templates to make the process even more transparent.

What is an example of an addendum to a document?

An example of an addendum could be adding a clause in a rental agreement that allows pets on the property when the original contract did not permit them.

What is the difference between an amendment and an addendum?

While both change the terms of the contract, an amendment modifies the existing contract, while an addendum adds a new document that specifies the changes.

What does an addendum look like in a contract?

An addendum typically includes a title, a reference to the existing contract, a clear explanation of the changes, and signature lines for all parties involved.

What is the basic contract addendum?

A basic contract addendum outlines changes to an existing contract. It includes general information, contract background, amendments, general terms, and signatures.

Do addendums need to be signed?

Yes, all parties involved in the original contract must sign it for an addendum to be legally binding. Digital platforms like Signaturely can facilitate this process.

What You Need to Remember About an Addendum to a Contract Template

Navigating the sea of legal documentation can be tricky, but remember, an addendum is a flexible tool designed to adapt agreements to real-life changes without discarding the existing contract. Key to its effectiveness is clarity, precision, and mutual understanding.

Customize a template to suit your specific needs, ensuring that all modifications align with the initial agreement’s spirit and purpose. More importantly, remember to sign the addendum. This part is critical to make the addendum legally binding. In this digital age, online platforms like Signaturely make this step easy and reliable.

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Contract Addendum Template



  • This Contract Addendum (hereinafter referred to as the “Contract”) is entered into on ________________ (the “Effective Date”), by and between ________________________, with an address of ________________ (hereinafter referred to as the “First Party”) and ________________with an address of ________________ (hereinafter referred to as the “Second Party”) (collectively referred to as the “Parties”).

  • Whereas, the Parties declare that this is the first amendment to the agreement. 


The Parties entered into an agreement dated ________________ (hereinafter referred to as the “Original Agreement” for the following purposes:

  1. ________________________________________________________________________
  2. ________________________________________________________________________
  3. ________________________________________________________________________
  4. ________________________________________________________________________
  5. ________________________________________________________________________


Whereas, the Parties agree to amend the Original Agreement as follows:



  • The Parties agree that other than the aforementioned changes present under “Amendments” in this Contract, all of the clauses and/or articles of the Original Agreement will remain unchanged and fully binding. 


  • Any dispute and/or difference arising out of or related to this Agreement will be submitted to ________________ (Arbitration/mediation/negotiation) according to, and subject to the laws of ________________.


  • This Agreement will be governed by and construed according to the laws of ________________.


  • The Parties hereby agree to the terms and conditions set forth in this Agreement and such is demonstrated throughout their signatures below:

First Party


Second Party






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