A Whanganui woman is in Christchurch Hospital after falling through a roof.

Trudy Taylor from St John Ambulance said Kat Wade was found late on Saturday morning.

"What we don't know is how long she had been there," Ms Taylor said.

The Wanganui Chronicle understands Ms Wade fell six metres and has neck and spinal injuries.

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She was taken to Whanganui Hospital in a moderate condition and later transported to Christchurch Hospital. Amy Milne from Canterbury District Health Board Ms Wade was currently stable.

A spokeswoman for Ms Wade's family declined to comment.