BENGALURU, Aug 30 (Reuters) - The sizzling pace of house price rises in most major world housing markets since the pandemic began has likely peaked, but affordability is set to remain stretched or worsen in the next few years, according to Reuters polls of experts. Reuters polls of over 100 property market experts taken Aug. 10-25 covering eight key markets - the U.S., Canada, Britain, India, Australia, New Zealand, China and Dubai - mostly showed price rises would cool over the next two years. Reuters poll graphic on the global housing market outlook Reuters poll graphics on the biggest downside risk to housing markets outlook But with most central banks expected to keep rates near record lows through next year, house price inflation is still expected to easily outstrip wage gains. Taken together with rising materials costs - and a lack of supply of affordable homes in many markets even before the pandemic drove many homeowners to search for more living space - home prices are nearly certain to rise further. That means for most, especially young people who are looking to buy their first home, it is only going to get tougher. "The surge in home prices has wiped away the gains in affordability brought on by lower interest rates, causing many would-be home buyers to put off buying," said Mark Vitner, senior economist at Wells Fargo. Asked how housing affordability would change over the next few years in markets they cover, over 80% of poll respondents, or 77 of 94, said it would worsen or stay about the same. A whisker less than half, 49%, of those said it would worsen, and for nearly all of the most hotly inflated markets this year, that figure was well over 50%. "Clearly there are many cross-currents impacting the housing market today from volatile long-term interest rates, low affordability, shortages of labor and land, and sparse existing inventory," said Scott Anderson, chief economist at Bank of the West. "We are forecasting housing market activity to settle into a more sustainable pace over the next 18 months, with some payback from home sales that were likely pulled forward during the pandemic." If that is true, the trend is not set to ease in coming years until more homes are built. But even with the current low rates of homebuilding in most markets, building material, labour and lumber costs are more likely to rise than fall. House prices in the United States, Canada, Australia and New Zealand were predicted to rise in double-digits this year and then slow to single digits in 2022. read more Apart from Dubai, house prices in the U.S., Canada, UK, India and Australia were rated above 5, where 1 was cheap and 10 is expensive, with New Zealand rated 9, suggesting residential properties there were beyond reach for first-time buyers. Over 50% of the analysts in most economies polled predicted affordability to worsen over the next few years, with nearly 90% of analysts saying so in Australia. Less than a handful of analysts predicted a fall in house prices anywhere in India and a majority of respondents there said affordability would improve in the country despite expectations of two 25 basis-point interest rate rises in the next fiscal year. Nearly 40% of analysts who responded to an additional question said the biggest downside risk to their house price forecasts were central banks moving away from pandemic stimulus, followed by the spread of new coronavirus variants. Eighteen analysts said a slowdown in economic growth, five said supply chain disruption, four said high unemployment and only two said returning to a full-time work week was the biggest downside risk to the housing market over the next 12 months. "Home prices appreciation will moderate fast, but wage growth will not compensate for the fading government emergency programs," said Sebastien Lavoie, chief economist at Laurentian Bank. "A new variant reducing vaccine efficacy could force authorities in North America to re-introduce broad lockdown measures, bringing more permanent layoffs than in previous pandemic waves. Slowdown in economic growth is also another important downside risk." (Other stories from the Reuters housing market polls: )