The extension is in light of the national bank holiday on 19 September for the State Funeral of Her Majesty Queen Elizabeth II.
Land Registry says that any affected cancellation dates will also be extended.
Notices and search certificates issued before 19 September that include an expiry date will not reflect the automatic extension.
For example, a notice issued on 12 September that states that it expires on 3 October will actually not expire until 4 October.
Land Registry’s customer support centre and technical support teams will not be available on 19 September.