Gwent Police Force carried out a warrant under the Misuse of Drugs Act in Ebbw Vale at around 5.20am on Wednesday 14 December.
During a search of the property, a quantity of class A and class B drugs, as well as cash, was seized by officers.
A 31-year-old Ebbw Vale man was arrested on suspicion of:
possession with intent to supply class A drugs
possession with intent to supply class B drugs
possession of criminal property.
He remains in police custody.
If you have concerns about drug dealing in your area, please call us on 101 or 999 in an emergency. Alternatively, Crimestoppers can be contacted anonymously on 0800 555 111.