An Adelaide pizza shop owner has been left devastated after a suspected arson attack gutted his family business.

The owner of Sugo pizzeria in Dulwich, Adrian Cracea, was in tears after seeing the burnt-out building.

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Emergency services crews were called to the family-run business just before 3.30am on Friday after reports of a fire.

Firefighters were able to bring the blaze under control, but it caused significant damage to the shop.

'Heartbroken' owner

Cracea says he's heartbroken for his staff - including his wife and son who work for the business.

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"My mind just goes to my staff - the fact that they have families... the fact that they are losing their jobs," he said.

Cracea then broke into tears.

A devastated Cracea surveys the damage. Credit: 7NEWS

"A dozen people will be affected, one way or another," he said.

"But we'll be back."

Investigations have discovered the front shop window had been smashed.

Evidence of accelerant was located inside.

Cracea is pleading for anyone with information about the incident to come forward.