Property analysts are predicting a strong start to the spring selling season when it kicks off in September.

Listings activity is already strong in the lead up to spring, according to PropTrack which says winter seller activity is at a decade high.

PropTrack data shows total stock on market increased 4.9% in July compared with last year which is the largest year-on-year increase since 2010.

Strong activity in Sydney is behind the increase in listings.

Director of economic research Cameron Kusher is optimistic about the start of the spring selling season.

“I do think, at least in early spring, we’re going to see quite strong listings,” he says. “I think there’ll be that sense of urgency right at the start to get properties on the market.”

Real estate agency sources say that listing authorities, which is when properties are locked in to be sold but not yet on the market, are on par with the same time last year.