The agency says the Calgary region was the top contributor to the gain, marking the third consecutive month it has led the way in Canada.
The region showed the largest monthly price gain, up 0.8 per cent over February.
New home prices in St. John's rose 0.3 per cent, the first increase since August.
Prices were down in Charlottetown, Victoria, Saskatoon, Ottawa–Gatineau and Vancouver.
They were unchanged in 11 of the 21 metropolitan areas surveyed