---
title: "Attach a document to an existing application"
method: POST
path: "/v1/applications/{application_request_id}/attachments"
tags: ["Attach a document"]
---

# Attach a document to an existing application

`POST /v1/applications/{application_request_id}/attachments`

## Request

- Base URL: `https://businessgateway.landregistry.gov.uk/bg2/api`
- URL: `https://businessgateway.landregistry.gov.uk/bg2/api/v1/applications/{application_request_id}/attachments`
- Auth: HTTP basic
- TypeScript: <https://skmtc.dev/hm-land-registry/apis/v1-0-submit-an-application-to-change-the-land-register-api-s/docs/v1/applications/:application_request_id/attachments/post.ts> (a function with typed inputs; its response is checked against the schema)

Attach a document from Send a Document to an existing application

## Path parameters

- `application_request_id` string, required

## Request body

- AttachADocumentRequest: The request to send to the endpoint to request an upload URL
  - `data` object, required
    - `certification_statement_type` 'CERTIFIED' | 'CERTIFIED_BY_ANOTHER' | 'NOT_CERTIFIED', required: * `CERTIFIED` - I/we certify this is a true copy of an original document * `CERTIFIED_BY_ANOTHER` - I/we certify this document is a true copy of an original document which is certified by a conveyancer to be a true copy of the original * `NOT_CERTIFIED` - This document is an uncertified copy
    - `document_id` string, required: The id of the document from the document upload request

## Response `202`

Accepted

## Other responses

- `400`: Bad Request
- `401`: Unauthorised - an access token is required
- `404`: Application creation request not found in the system
- `500`: Internal Server Error

## Changes

- **2025-11-07** `04719f6cbb9c`: 1 info
  - api operation id `Attach a document` removed and replaced with `attach_a_document_v1`

[Operation history](https://skmtc.dev/hm-land-registry/apis/v1-0-submit-an-application-to-change-the-land-register-api-s/changes/v1/applications/:application_request_id/attachments/post.md)

---

[API](https://skmtc.dev/hm-land-registry/apis/v1-0-submit-an-application-to-change-the-land-register-api-s.md) - [All operations](https://skmtc.dev/hm-land-registry/apis/v1-0-submit-an-application-to-change-the-land-register-api-s/llms.txt) - [OpenAPI document](https://skmtc.dev/hm-land-registry/apis/v1-0-submit-an-application-to-change-the-land-register-api-s/revisions/6964bf9fc289?raw)