A truck driver suffered a likely medical event before his vehicle ploughed into two houses in South Auckland this morning.

The man in his 50s became trapped in the cab of his truck when the balcony of the second home, which is also a homeopathic clinic, collapsed on it during the accident, near the intersections of Central Ave and Watson Place about 5.29am.

"The truck driver was in a critical condition and emergency services were working to free him but he died at the scene," a police spokeswoman said.

Raghubir Rehan and his family were asleep upstairs above the clinic and thought the shaking and noise that woke them was an earthquake.

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"Then I saw from upstairs, by the window, a truck was inside the clinic," he said.

"It was a huge shock. We are very shocked, emotional. We have done lots of hard work on the house and the clinic."

Emergency services are still at the scene working to remove the truck and stabilise the building.

"The truck is still in the house, they are trying to move it but the house is double-storey and the balcony has collapsed on the truck," Dr Rehan said.

Traffic is being diverted around the scene at Great Southern Road and Central Avenue. It's believed no one was home in the other house.

The Serious Crash Unit is investigating the incident this morning where a truck driver crashed into two houses. Photo / Nick Reed
The Serious Crash Unit is investigating the incident this morning where a truck driver crashed into two houses. Photo / Nick Reed

Part of the house's roof has been detached and is hanging over the truck.

A neighbour said the crash sounded like "a plane crash".

"It was like nothing I have ever heard," said the woman who did not wish to be named.

"Lots of people ran out straight away and were calling the police, and then the ambulance and everything arrived.

"I feel so sorry for his family."

Counties Manukau Police Acting Senior Sergeant Dion Bentley said the truck went through the fence of a house on the corner of Central Ave.

It ploughed through the fence, hitting the corner of the single storey brick home before smashing into the two storeyed house.

Great South Rd is cordoned off for a block between Tui St and Regent Ave, and would likely be until midday, said Mr Bentley.

A police spokeswoman said the serious crash unit was investigating.

- Newstalk ZB