"We used to pride ourselves on being egalitarian and giving a fair go - what has happened to that?" Coates asked, receiving a huge round of applause.
Seymour said the Resource Management Act was a large part of the issue, and regulations needed to be looser, but Goldsmith countered that houses were being built.
When asked by moderator Tim Watkin how many in Auckland in the past year, Goldsmith said 16,000. Watkin said it was actually 6000. Goldsmith conceded more were needed.
That concession was about the only time candidates broke from their party lines, except when asked their personal feelings on euthanasia - a bill put before the house by Seymour. All said they wanted more information, but Goldsmith and Parker were most unsure. Seymour said it was a key issue.
Asked if there was a "point" to Seymour for centre-right voters, Seymour argued there definitely was. He said he was a good local MP, but also that if people in Epsom wanted a centre-right government "they had to have the Act Party".
"You can't govern alone, you can't have Labour. You can't have Greens. New Zealand First are unreliable and the Maori Party are a fair-weather friend," he said.
When asked his position, Goldsmith said his focus was on the party vote, and he was aiming to get 25,000 for National.
The deal between National and Act began in 2008, when John Key signalled over a symbolic cup of coffee he wanted Epsom voters to give their electorate vote to then-Act leader Rodney Hide.
The stunt was repeated over a cup of tea with John Banks in 2011. But a sideshow ensued when the pair's conversation was recorded without their knowledge and later leaked.
In 2014, Act got 43 per cent of the candidate vote, but just 3 per cent of the party vote.