A Christchurch contractor's in critical condition - after falling through a ceiling.

Emergency services were called to Fendalton New World on Memorial Avenue, just before midday.

Foodstuffs spokesperson Sue Hamilton says the man was working in a ceiling space, before losing his balance and falling through the ceiling.

She says his employer has begun a full investigation and the incident has been reported to WorkSafe.

St John's has confirmed the man was taken to Christchurch Hospital.