Once again, the market was ahead of last year with 43 sales in June 2010.
Real estate bosses are confident of a continuing improvement in the market.
Max Martin, Harcourts franchise owner, said: "You expect things to be a bit quieter at this time of the year but we are getting inquiries, particularly from Christchurch, and I think sales will pick up in the spring."
He went one step further: "I believe we have a positive 12 months ahead of us.
"I expect to see more people from Christchurch, once they have the money in their pockets [from earthquake claims].
"There's also a lot of money going into the Waikato. The dairy farmers have had a good season with production and prices, and even the sheep farmers are getting $200 a lamb.
"People always want to retire here and will continue to buy," Mr Martin said.
Ross Stanway, spokesman for Eves Realty and Bayleys, said he was not surprised the residential property market eased back in June after two strong months.
But the market was going through an interesting period as it was starting to turn in favour of the sellers, he said.
"We've seen a buyer's market but there's now more [potential] buyers about than the number of homes for sale. There are early signs of increased competition amongst buyers and I'd say the market is at an equilibrium point presently.
"I believe there is real pent-up buyer interest and it will be interesting to see how the market develops over the next two months," Mr Stanway said.
REINZ chief executive Helen O'Sullivan said the institute was getting strong indications from agents in many regions that the supply of properties was really tightening.
"Rather than an influx of buyers, we are seeing very low levels of listings as sellers continue to sit on their assets," she said.
That was backed up by the latest BNZ-REINZ market survey of real estate agents, which also indicated that the shortage of listings was now the main reason holding buyers back from buying a property.
A net 34.2 per cent of respondents cited a lack of suitable properties available for sale as the main reason holding buyers back, up from 22.4 per cent in the previous month's survey.
Auckland, Manawatu/Wanganui, Canterbury/Westland and Taranaki were all reporting shortages of properties for sale. Similar concerns had not yet arisen in Northland, Hawke's Bay, Otago and Southland.
The national median days to sell changed by one day from 45 in May to 44 days in June. In June 2010, it was 45.
Nationally, 5229 unconditional sales were recorded last month, up by 654 on June last year but down 534 on volume in May this year. The national median house price rose by $10,000 to $360,000 in June.