Inflation over the quarter hit 1.8 per cent, according to data from Australian Bureau of Statistics.

Underlying inflation – the figure the central bank pays most attention to when it makes its interest rate decisions – hit 6.1 per cent in the year to September.

Construction costs drove the lift in the CPI in September.

“Labour shortages in the house construction industry, leading to rises in labour costs, contributed to the rise in new dwellings this quarter,” the ABS said.

The figures followed the Albanese government’s first budget, which was broadly applauded for not pumping more stimulus into the economy and driving inflation higher.

Headline inflation hit 6.1 per cent in annual terms in the June quarter and is expected to peak at 7.75 per cent.

The latest round of floods are expected to keep inflation hovering around its peak for longer as soaring energy prices also take their toll, but lower petrol prices are helping to keep inflation depressed.

Treasury expects the floods in Tasmania, NSW and Victoria to push fruit and vegetable prices up by 8 per cent over the next two quarters.

The quarterly inflation will be watched carefully by the Reserve Bank of Australia ahead of its November interest rate decision.

St George economist Pat Bustamante said higher-than-expected inflation would put pressure on the RBA to keep hiking rates, especially if the lift is predominantly driven by higher wages.

-AAP