"We still don't know. We know there's lots of land damage and there's damage to homes," he said.
IAG's Christchurch office is in Show Pl, Addington and Dowling expressed concerns about staff working from there.
"Our first concern has been with people who are impacted directly or indirectly, particularly through the closure of Cashmere High School and the impact of the smoke. But we're also concerned with how we can play a wider role and with anything we can do," he said, citing relationships with organisations such as Red Cross and emergency management groups.
"Christchurch people have been through a lot already. They're a pretty resilient bunch," he said.
The business insures about 40 per cent of city residences, he said, noting its dominant market position, after it bought AMI which had been Christchurch-headquartered.
IAG's brands in New Zealand include State, NZI, Lumley, NAC, DriveRight and Lantern. It also has shareholdings in First Rescue and Emergency (NZ) (50 per cent owned), which manages State Roadside Rescue, the vehicle breakdown service. It has 25 per cent in Loyalty New Zealand, which manages the Fly Buys loyalty programme.
IAG underwrites general insurance for ASB, BNZ Westpac and The Co-operative Bank.
By June 30 last year, the New Zealand business had completed over $5.7b of claim settlements for the Canterbury earthquakes. About 93 per cent of all claims by number had been fully settled by that date, it said.
IAG underwrites more than $A11b of premium per annum here, in Australia and Asia.