Powys Council Council says officers are to meet with the owner of the Bethel Chapel in New Street in the town after the roof caved in on Monday morning.
The Gothic building, which was sold in 2008 had fallen into dereliction.
After heavy rain overnight on Monday mid section of the roof collapsed completely,
Emergency services closed part of the road amid fears the front of the chapel could fall into the street.
A spokesperson for Powys County Council said: “Officers from the county council’s building control service have met with emergency services at the site and are due to meet with the building’s owner to discuss future actions.
“The site has been cordoned off and we advise residents to stay away from the area. The council’s priority is public safety.”