A Counternotice (CN) is a legal document in the UK housing context that is used to object to an eviction notice. It is a formal response to an eviction notice issued under section 21 of the Housing Act 1988. The Counternotice allows a tenant to contest the eviction notice and state their reasons why they should not be evicted, and it must be submitted within 28 days of the eviction notice being served. The purpose of the Counternotice is to allow tenants to challenge the eviction notice, and it provides the tenant with the opportunity to provide evidence that the eviction notice is invalid or was issued wrongfully. The scope of the Counternotice is limited to the specific grounds of challenge outlined in the eviction notice, and it is not a substitute for taking other legal action.