An addendum is a formal document that adds information to an existing contract, like adding specific appliances to a home sale, new services to a marketing agreement, or pet rules to a lease, becoming part of the original agreement once signed by all parties. Examples include a Real Estate Addendum listing furniture included in a home sale or a Pet Addendum for a rental agreement detailing pet rules and fees. Common Examples Real Estate: Adding items like a washer, dryer, or deck furniture to a home purchase contract. Leases: A Pet Addendum outlining rules, deposits, and fees for tenants with pets. Services Contracts: Adding social media management to a marketing agreement with new terms and pricing. Insurance: A Home Business Endorsement to a homeowners policy to cover business property and liability. Law School Applications: A law school addendum to explain extenuating circumstances or add relevant details not in the main application. Key Characteristics of an Addendum References Original: Clearly states its an addition to a specific, dated contract. Adds, Doesnt Change: Incorporates new terms or details, rather than altering existing clauses (which would be an amendment). Clear Specific: Uses precise language to detail the additions or modifications. Signed by All: Requires signatures from all parties to be legally binding. Simple Example: Real Estate Addendum This addendum is made to the Real Estate Purchase Agreement dated [Date], between [Buyer Name(s)] and [Seller Name(s)] for the property at [Property Address]. Article 1: Added Inclusions The Seller agrees to include the following items in the sale of the property at no additional cost to the Buyer: Refrigerator (Model: [Model Number]) Washer (Brand: [Brand]) Dryer (Brand: [Brand]) All other terms and conditions of the original Agreement remain in full force and effect. Signatures: (Buyer) Date: (Seller) Date: AI can make mistakes, so double-check responsesaddendum | Wex | US Law | LII / Legal Information InstituteAn addendum is an addition to a finished document, such as a contract. The most common addendum is an attachment or exhibit at theLII | Legal Information InstituteWhat Is an Addendum? Definition, How It Works, and ExamplesInvestopedia