# Address Number > Address Number means the specific numerical identifier allocated for a property or a unit. **Term:** Address Number **Last updated:** 2026-07-29 ## Definition ## What an "address number" means in a contract In a contract, an "address number" is the specific numerical identifier allocated to a property or a unit, such as a house number, unit number, or plot number. It is a small but load-bearing detail, because it is often the most precise way to identify the exact premises a contract concerns. Defining or recording it accurately matters wherever the identity of a property drives the parties' rights and obligations, from sale and lease to management and the delivery of notices. ### How the term is defined and measured The address number is usually captured as part of a full property description, combined with the street, locality, and any official registration or title reference. In contracts dealing with subdivided buildings, the address number may distinguish one unit from another within the same block, so it must match the numbering used in any plan, schedule, or registry entry. The reliability of the identifier is measured by whether it corresponds to official records. Where a contract relies on an address number alone, an error can create genuine doubt about which property is meant. ### Where the term appears The address number appears across property documents. In a [Property Deed](https://www.genieai.co/en-us/template-type/property-deed), it forms part of the description that identifies the land or unit being transferred, and it must align with the title record. In a [Property Management Agreement](https://www.genieai.co/en-us/template-type/property-management-agreement), the address number identifies the premises the manager is responsible for, which scopes the services and the liability. It is also central to change-of-details processes: a [Change of Address Notification](https://www.genieai.co/en-us/template-type/change-of-address-notification) exists precisely to update the recorded address so that notices and correspondence continue to reach the right place. ### Why the exact wording matters Precise recording prevents identity disputes. If an address number is wrong or ambiguous, a party may struggle to prove which property a sale, lease, or charge actually covers, which can undermine the whole transaction. The address also governs the delivery of notices: many contracts say a notice is validly served if sent to the address stated in the agreement, so an inaccurate number can mean an important notice never reaches the intended recipient yet is still treated as served. Under the law governing the contract, the property description the parties recorded is what binds them, so accuracy in this small field carries outsized consequences. ### Drafting considerations - **Use a full description.** Pair the address number with street, locality, and an official title or registration reference so identity is unambiguous. - **Match the records.** Ensure the number aligns with plans, schedules, and any registry entry, especially for units within a larger building. - **Link to notices.** Make clear whether the stated address governs where notices must be sent, and how the address can be changed. - **Provide for updates.** Include a clean process for notifying and recording any change of address during the term. - **Guard against reuse and renumbering.** Note that address numbers can be reassigned or changed by authorities over time, so anchor identity to a stable title reference as well. Subdivided and newly built developments deserve particular care. In these settings, unit numbering is sometimes provisional at the point of contract and only finalized on completion, so an agreement may need to describe the unit by reference to a plan until the official address number is confirmed. Recording the interim identifier and the mechanism for fixing the final one prevents a later gap between what the contract says and what the property is actually called once the numbering is settled. When premises change hands or details need updating, the address number should carry through consistently into every related document; guidance on [creating a property purchase agreement](https://www.genieai.co/blog/creating-a-property-purchase-agreement) shows how a precise property description underpins the wider deal. The safest approach is to treat the address number as one part of a complete, records-matched property description, so that identity, notices, and ownership all point to exactly the same premises. ## Context ### Relevant circumstances - Property transactions and transfers - Address changes or updates - Sales and purchases of goods with delivery - Assigning or transferring of licenses to a new address ### Relevant sectors - Real Estate - Retail - E-commerce - Transport and Logistics ## Relevant contract types - [Property Deed](https://www.genieai.co/en-us/template-type/property-deed) - [Property Management Agreement](https://www.genieai.co/en-us/template-type/property-management-agreement) - [Change of Address Notification](https://www.genieai.co/en-us/template-type/change-of-address-notification) --- This is the Markdown representation of [https://www.genieai.co/en-us/define/address-number](https://www.genieai.co/en-us/define/address-number), provided for AI agents and crawlers. 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