History tells us that with very rare exceptions, no matter how far property values fall, eventually they will come back even stronger.

The latest housing market data shows sales are down and prices have dropped an average of 11 per cent across Canada over the past year, so the difficult task facing people thinking of buying or selling is trying to figure out exactly where we are in the property value cycle, and whether they have the ability to hold out through the dip, however long it lasts.

Only last month, Bank of Canada governor Stephen Poloz and his senior deputy, Carolyn Wilkins, said the decline in sales activity in the first three months of the year (referred to as the first quarter, or Q1) would be temporary.

'We expect it to bounce back'

They said the imposition in January of stress tests — forcing new buyers and those wanting to change to a different lender to prove they could handle a hike in interest rates — meant many buyers rushed their purchases to beat the change.

That effectively boosted sales in late 2017 at the expense of business in the new year.

"We do expect [the new mortgage rules] to have a dampening effect on housing throughout the year but not to see the continued decline like we saw in Q1," said Wilkins. "We expect it to bounce back."

Even after the most devastating declines, house prices do bounce back.

Montreal real estate has been one of the hot spots in Canada, but overall sales and prices in the country are falling. (Graham Hughes/Canadian Press)

There have been exceptions, such as Canadian towns supported by a dying resource, or the departure of an entire industry as happened in Detroit, where residential neighbourhoods were turned back into fields. But those exceptions are rare.

I had a reminder last week during a visit to Ireland, which had a disastrous housing crash following the 2007 credit crunch. Construction projects underway were left unfinished and homeowners found themselves deep underwater as valuations fell below what they had paid.

Irish boom revisited

But ten years later that has all blown away. Last week, Ireland's Poloz equivalent, Philip Lane, issued a strong warning about Irish property prices being too high, a warning reiterated this week by the International Monetary Fund.

The net wealth of the average Irish person — in other words their assets minus what they owe — is now higher than it was before the crash, largely due to the rebound in house prices.

There are some lessons for Canadians from the Irish experience as they contemplate the future of house prices here.

People pass a sign reading 'Sold Out' in front of a condo building under construction in Toronto. (Chris Helgren/Reuters)

One is that the Irish price rebound didn't help everyone. Many people who overextended themselves in Ireland's Celtic Tiger boom and were forced to sell during the ensuing property collapse are likely still suffering from the personal finance debacle.

The other lesson is that sitting tight during a property crash can pay off — that is, if you can afford to wait long enough.

Small consolation

Of course, if the price declines that we've seen in the past two sets of Canadian Real Estate Association data continue, even the very likely prospect of an eventual rebound in house prices will be small consolation to those anxious to sell now or soon.

Most people planning to stay in a new or current property for the medium or long term should be fine.

But a job loss, a forced move or the arrival of a brace of children could change that calculus. The group that might not be able to wait could also include older people hoping to cash out and new buyers in over their heads as interest rates rise.

Even if prices continue to slide, odds are they will bounce back to new highs, but no one knows when that will happen. (Mark Blinch/Reuters)

That rise in mortgage costs seems even more likely to continue after yesterday's spike in Canadian bond rates to a seven-year high.

While some people in the real estate industry complain government interference is hurting their business, the entire purpose of stress tests is to prevent that last group — the over-borrowed — from being forced to sell during a dip in prices, something that could accentuate a serious property crash, should one occur.

Canadians care about the value of their houses and there is some evidence that falling house prices can rein in consumer spending because homeowners feel poorer, the so-called inverse wealth effect.

What comes next?

But for those hoping to move into or out of the property market, knowing what prices will do in the medium term — how far they will fall and how soon they might recover — is of crucial importance to their planning.

Unfortunately, while each of us can try to predict the future based on various considerations, all those things are uncertain.

Yesterday's CREA numbers for April seem to show that the optimism of Poloz and Wilkins following the first quarter dip has not yet played out.

TD Bank says the Canadian housing market will recover at the end of this year and strengthen in 2019 on the back of rising employment and a growing population. Of course, they are in the business of selling mortgages, and predictions of housing market doom by Canadian bank economists are notable due to their rarity.

Others have been more gloomy. Over the years, international banks and organizations such as the IMF have predicted Canadian house price declines of anywhere from 30 per cent to more than 60 per cent.

But barring a catastrophe that would hurt a lot more than house prices, odds are that whatever the decline, real estate prices will recover. The only question is how long you will have to wait and whether you can afford to.

Follow Don on Twitter @don_pittis