A hotel boom that has delivered almost 16,000 new rooms and a fresh slate of accommodation options across the country over the past four years could run another two more years before it eases, a new forecast shows.

A further 7700 rooms are expected to be opened between now and 2026 – more than half of them in Sydney and Melbourne – before development finally slows to a “trickle” and “as the expansionary phase of the hotel market eases considerably”, Colliers said in its Australian Accommodation Supply Update.