The Extension Request Letter is a crucial business document used when a party needs to formally request the continuation of an existing contract beyond its original termination date. Under Swiss law, particularly the Swiss Code of Obligations, such requests must be made in writing and meet specific formal requirements. This document is typically employed when projects require additional time for completion, ongoing services need to be extended, or business relationships need to be maintained beyond the initially agreed period. The letter should clearly reference the original contract, specify the desired extension period, and provide justification for the request. It may also address any modifications to existing terms, though typically aims to maintain the original contract's conditions. The timing of submission is crucial, as Swiss law and business practice emphasize proper notice periods for contract modifications.

1. Letterhead and Date: Company letterhead with full contact details and current date

2. Recipient Details: Full name, title, and address of the recipient

3. Reference Line: Clear reference to the original contract/agreement including contract number and date

4. Subject Line: Clear indication that this is a contract extension request

5. Current Contract Status: Brief overview of the existing contract and its current expiration date

6. Extension Request: Specific request for extension, including proposed duration

7. Justification: Brief explanation of the reasons for requesting the extension

8. Terms Confirmation: Confirmation that all other terms and conditions remain unchanged

9. Closing: Professional closing with signature block