A joinder agreement is a document by which a new party joins an existing contract, assuming the same rights and obligations as the original parties.
| Application | Use Case |
| Additional buyer | Adding co-purchaser after initial contract |
| Guarantor addition | Including third-party security |
| Investor joining | New partner in development |
| Lender participation | Multiple financing sources |
| Requirements | Element |
| Original parties consent | All must agree |
| Assumption of obligations | New party accepts duties |
| Equal standing | Same rights as existing parties |
| Written execution | Formal documentation required |
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