BELOIT, Wis. -

Renovations underway inside a Beloit home that exploded were being done without a permit, according to the city's planning division.

The house at 2041 Meridith Dr. exploded and collapsed Sunday evening, according to the Beloit Fire Department. The explosion was under investigation Monday.

City officials told News 3 the last permit pulled for work at the home was to deal with a roofing issue in 2006. The city requires a permit for work costing more than $500.

Rescue crews pulled two people from the wreckage. A 33-year-old woman was rescued about 20 minutes after the initial call. She was taken to Mercy Hospital in Janesville suffering burns. A 37-year-old man was pulled from the rubble around 9:40 p.m. He was taken by Medflight to University of Wisconsin Hospital in Madison and was conscious.

One family pet died in the explosion. Another survived, according to fire officials.

Beloit Fire Chief Brad Liggett said first responders smelled gas when they arrived. Liggett told News 3 this incident is very similar to other gas leaks, but said the cause of the explosion is under investigation.