Steve Russell via Getty Images Construction cranes along Queens Quay in Toronto, June 24.

Contractors haven’t been building condos and rental apartments at this frenzied rate in nearly 30 years. So says a Bank of Montreal analysis of preliminary housing starts data from Canada Mortgage and Housing Corp. (CMHC) for the month of June. Construction of multi-family dwellings — which include units in condo and rental buildings — roared last month at an annualized rate of about 186,000 starts, or “the highest level on record going back to 1990,” writes BMO senior economist Robert Kavcic. Watch: How Canada’s housing market is impacting jobs. Story continues below.

A housing start is defined as when construction work begins at the site of a new residential development. If the site encompasses 50 units, then that counts as 50 starts, for example. CMHC’s annualized rate is a measure of how many homes would be built in a year if current activity persists. Seasonal factors, such as winter slowdowns, are taken into account. Rapid multi-family construction largely helped push the rate up 26 per cent compared to May, clocking in at an annualized rate of 245,657 homes, according to CMHC. Single-family activity also increased on a month-over-month basis.

The June boom can be at least in part explained by unusually rough weather in previous months, which delayed work on sites across the country, leading to an influx as warmer weather arrived in June. “To be fair, there is likely still some catch-up going after a tough winter — recall that February saw one of the weakest readings of cycle, and recent permit activity suggested that there was a backlog of new ground to be broken,” Kavcic notes. But there are other factors supporting the creation of new homes as well. “Residential construction activity remains rock solid, as still-strong demographic flows are supporting unit demand. Yet another factor helping to drive a strong rebound in Q2 real GDP growth,” he adds.