South Coast bach owner Duncan Mackay is powerless to stop the demolition of his home for the last two years.

A Wellington man watched in tears as Wellington City Council demolished his historic Owhiro Bay bach on Monday morning.

Duncan Mackay's bach is one of five that have perched on the hill at Mestanes Bay, on the wild south coast of Wellington, near Red Rocks, for as long as 100 years.

He bought his Heritage New Zealand-listed Stevenson bach for $10,000 in March 2012, lived in it for two years, and was renovating it to live in and, one day, pass on to his 13-year-old daughter.

SUPPLIED Duncan Mackay's renovated bach near Red Rocks, which has been pulled down by the council because it no longer resembles the heritage-listed one he bought.

But on Friday, the council told him it was going to demolish the bach on Monday, claiming his $40,000 of renovations meant it was no longer entitled to be considered a heritage building.

On Monday morning, Mackay drove around the coast to see his bach being torn apart, the roof gone, men in high-vis jackets breaking down the interior.

"This is crushing me," he said as he looked on, tears in his eyes.

"I wanted to pass it down through the family ... Now I'm homeless, I'm literally sleeping on a friend's couch."

Not much of the original materials of Stevenson's bach remained, but Mackay said he had been in regular contact with Heritage NZ and was replacing everything so it looked "absolutely, totally the same", down to its pine-green corrugated-iron exterior and the angle of the roof.

"I've done what I was told to do. I think this is council squashing the small guy and destroying a piece of south-coast heritage."

But the council, which owns the land, said the work bore no resemblance to the heritage bach.

"He did have possession of a heritage bach on the site, and he demolished the heritage bach and now is illegally building a new bach on the site," council spokesman Richard MacLean said.

"We are having it demolished because it's on public land and we are the landowner, and he's illegally building on public land..."

Mackay would not be compensated, MacLean confirmed.

The other Mestanes Bay bach owners, who had also made significant renovations, should not be concerned because the council still considered their properties "heritage baches".

"They are still substantially original buildings ," MacLean said. "He [Mackay] has demolished his bach, that's what that big pile of broken wood is."

He said Mackay was not homeless, as he lived elsewhere in Wellington. The bach was a building site and was uninhabitable anyway.

When contacted on Monday, Heritage NZ was surprised to hear the bach had been demolished.

Former project advisor Calum Maclean confirmed Heritage NZ had discussions with Mackay after he contacted them.

He said the Mestanes group of baches were given heritage recognition as a Historic Area on the Heritage New Zealand list.

"'We were supportive of finding ways to retain its heritage values and support its ongoing use ... In terms of heritage, it is unfortunate that the original bach has since been demolished."

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