Around 7600 new apartments and townhouses are under construction and a further 3300 new units are being marketed.
However, none of this includes retirement village units or apartments, he said, as those had not been included in his survey.
The busiest Auckland apartment builder is Kalmar, followed by Hawkins and Dominion.
"These names and the others on the list are all commercial construction companies - they've always been involved in commercial construction, such as offices, shopping centres or hotels, which tends to be on a different scale than house building," Polkinghorne said.
Leuschke Group and Paul Brown & Architects both specialised heavily in apartments in recent years and they emerged as the busiest architects in the field.
Many other companies on the list are major architecture firms.
"Ockham Residential is an interesting exception - they're an apartment developer that also designs their own buildings, what economists call 'vertically integrated'. The major retirement villages often do this too, and in fact Ryman and Summerset are their own developers, builders and architects," Polkinghorne said.
Last month, a top researcher said Auckland's construction surge would result in 1216 new apartments worth more than $600 million being built this year in the CBD, the highest number this decade.
Zoltan Moricz, senior director and head of research at real estate agents and consultants CBRE New Zealand, said 343 new units had already been completed this year in the heart of the city, not counting suburban projects. A further 873 CBD units were under construction and due to be finished this year, he said. That gives a total of 1216 new units, his data showed.
In 2012 and 2014, not a single apartment was completed in Auckland. Yet last year, the number jumped to 794 new units finished across a number of new city blocks.
Moricz said although current numbers were high, he was confident there would not be an oversupply which could leave new units unsold