Police were called just after midnight today (Thursday, March 11) to an address in Queens Road, Watford.
A large illegal party was in full swing, with 15 people inside the property.
The party was clearly "pre-planned", Watford Police said.
All attendees and the organiser were served with fines for breaching Covid-19 regulations and instructed to leave the property and not return.
Shortly after leaving, police received a call stating a man had returned and was trying to force his way back into the Covid party house – he was unaware he was being watched live on the Ring Door Bell.
Officers returned and arrested him for criminal damage and possession of cannabis.