Prices aren't down 20-30% - you're referring to average sales price. Big difference. It's been attributed to the sales mix (people opting for condos/townhomes)
Sorry. Your info doesn't match the same reality I live in. As the parent said, sales went down (don't know about mix). Prices for detached homes have not. We were seriously putting offers in March and got outbid for INSANE sums. e.g. 720K offer in Milton .. property went for 100K over. In Mississauga, homes listed for 850K went for 950K-1million. I am looking at data now and it has slowed but not gone down yet.
Real estate is local. I've seen multiple listing in the Toronto area, SFH, that haven't sold and are delisting at 20-30% below comparables from 3 months ago.
Unless I'm reading the reports wrong, according to the Toronto Real Estate Board (TREB) the average price of a detached housed in the "416" (Toronto) area in July 2017 was $1,304,288. In August it was $1,191,052.
So that means a -8.7% change from July to August alone.
Numbers for recent months - Detached houses in "416" area code:
August: $1,191,052
July: $1,304,288
June: $1,386,524
May: $1,503,868
April: $1,578,542
"From the market's peak in April this year, the average price for detached homes in the GTA has fallen 19.6 per cent to $968,494 in August from $1,205,262 in April, bringing the average detached home price back below $1,000,000 in the region."
It is also worth noting that there was exceptionally abnormal growth[1] early in the year. The average price for July only brought it back to trend. It will be interesting to see what August numbers bring.