A couple got more than they bargained for when they found 150 snakes living under their new home.

Shaynon McFadden and Royce Robins discovered a large snake den underneath the back deck of the house they bought on Rushmore Street, Elizabeth, Colorado.

To their horror they then found the creatures springing up through gaps in decking at the rear of their house.

'We started seeing garter snake heads popping up in between the wood slats on the ground level patio,' Mrs McFaddon said.

The couple found Garter snakes popping up through the decking in the rear of their new home in Elizabeth, Colorado

A group of snakes wrapped themselves around some insulation inside a wall cavity

As the weather warmed, more snakes appeared in the yard, under the deck, around the foundation and even inside the home.

'My cats had it cornered in the bathroom,' Mrs McFadden said. 'We're not sure how it got in, but we got rid of that one right away.'

The couple hired an exterminator, who discovered a large snake den underneath the back deck.

More than 150 snakes were removed from the property and relocated.

The couple spent about $8,000 on a new deck, shed and pest control.

One of the couple's cats watches a snake as it slithers up the inside window of the house. Their cats also cornered one snake in the bathroom

More Garter snakes pop up in between the back deck at the back of the couple's property

A snake curled up on the outside wall inspects a vent which may give it access to inside the house

Mrs McFadden said she had no idea about the 'snake infestation' when she and her husband purchased the home in November 2018 after deciding to share their ordeal.

'It was not disclosed to us when we bought the house, so it was a surprise,' she said.

Under Colorado law, sellers and realtors must disclose any material facts about the property to a potential buyer.

According to nonprofit real estate trade association, the Colorado Association of Realtors, a snake infestation would qualify as a material fact that would have to be disclosed, regardless of efforts by the owner to fix the problem.

A spokesperson said that arguments over non-disclosure are among the most common disputes after a sale.