However, the massive house will still feature six bedrooms - each with ensuite bathrooms - a library, two kitchens, living rooms and dining rooms, and will be broken into wings centred on courtyards and water features and overlooking a pool.
The Herald understands the home is being built by two New Zealand sisters who run a cafe and catering business in Dubai.
But architect Richard Naish, of RTA Studio in Auckland, would not divulge details about his client.
Mr Naish said the client was extremely private and did not want publicity about the home, which still did not have a construction date.
He would not be drawn on how long it would take to build such a large house, which is seven times the size of the average newly built New Zealand home.
In elevation drawings the house is shown to be built into the hillside property with 180-degree ocean views.
New Zealand Institute of Architects Waikato/Bay of Plenty branch chairman Andrew Bydder said he had once worked on a 1400sq m house built in the Waikato but that included eight-car garaging and was home to an extended family.
Mr Bydder said most newly built homes were around 200sq m.
He said the construction cost of the Te Mata home would vary depending on the owner's taste but larger, more lavish homes averaged out at about $2000 a square metre.
"People who tend to build bigger houses usually have more expensive tastes so the material cost goes up," he said.
That would put the building cost alone at $3 million for the Te Mata house.
Richardsons Real Estate Pauanui director and general manager Neil Christie said that in his 15 years in the industry the largest homes he had come across in the Coromandel were up to 500sq m.
They were at Pauanui Waterways, Matarangi, Hahei and Cooks Beach, all popular holiday destinations for Aucklanders and Hamiltonians.
The Herald understands the owner of the Te Mata property has an affinity with the Coromandel, having holidayed there for many years.
MANSIONS
* The Chrisco mansion in Coatesville, north of Auckland, was built for Richard and Ruth Bradley - founders of Christmas hamper company Chrisco. The $30 million, four-storey home covers 4459sq m.
* Hanover co-founder Mark Hotchin's $37 million home being built on a 4322sq m site in Auckland's famous Paritai Drive includes seven-bedrooms and a 12-car garage.
* Jailed Hamilton accountant Gary Soffe built a 745sq m mansion at Tamahere including a gym, bar, cellar, pool pavilion and six-car garaging.
