Sensitive property documents should be kept in access-controlled storage and retained only for a clear, documented purpose. Hong Kong’s Privacy Commissioner for Personal Data states that personal data should not be kept longer than necessary for that purpose and notes that holding less data may reduce exposure to security risk.
Start with the purpose of each record
The seller should group documents by why they are needed—for example, completing the sale and handover, maintaining a transaction record, or meeting another confirmed requirement. Each group should have a simple note explaining:
- why the records are retained;
- who needs access;
- what event makes continued retention unnecessary.
This does not establish a legal retention period. It helps the seller identify which records may no longer be needed and which assumptions still require confirmation.
Keep the stored data limited
Before scanning, uploading, or forwarding documents, the seller can consider:
- removing duplicate or convenience copies where appropriate;
- retaining an extract instead of a full copy when it serves the same purpose;
- excluding irrelevant personal details from working versions;
- checking email attachments, shared folders, devices, and backups for additional copies;
- avoiding the creation of new copies merely because storage is convenient.
The key question is whether each piece of personal data remains necessary for the identified purpose. A smaller collection may reduce potential exposure to security risk.
Control access to the documents
Digital records should be placed in a private location with access restricted to people who need them. Where available, password protection, multifactor authentication, and encryption can add protection against unauthorized access. Shared links should not remain open unless continued access is necessary.
Paper records should similarly be kept in a locked or otherwise controlled location. The seller should also consider who can view, copy, remove, or disclose them.
These are practical handling measures rather than substitutes for checking document-specific retention requirements.
How to check the storage arrangement
A regular review should ask:
- Does every document or folder still have a defined purpose?
- Are duplicate or unnecessary copies identifiable?
- Is access limited to current needs?
- Can shared links or physical access be restricted?
- Are copies held elsewhere, including backups?
- Which records may be candidates for disposal, pending confirmation of any applicable requirements?
What the seller must still confirm
The cited privacy guidance does not specify retention periods for individual property documents. It also does not determine whether an original is required, how many copies may be kept, which storage method is acceptable, or when and how records should be disposed of.
Before discarding records, the seller should separately check the sale contract, any applicable legal or official record-keeping requirements, and current official guidance. Data minimisation should not be treated as permission to destroy records until those separate questions have been confirmed.