Weaker housing market conditions will weigh on GDP growth in 2026, according to the central bank. (Christopher Hopkins/AAP PHOTOS)Weaker housing market conditions will weigh on GDP growth in 2026, according to the central bank. While the RBA produces its own housing price forecasts, it also relies on estimates produced by market economists at the major banks. Lower housing prices will weigh on consumption by reducing household wealth, the RBA said. The RBA downgraded its productivity growth forecast for 2026 from 0.2 per cent to a decline of 0.5 per cent.