Brisbane residents will have to put up with the roadworks on Kingsford Smith Drive for another 18 months, and some suburbs will be slugged with a six per cent rate rise, the council budget has revealed.

The timeline was included as part of Brisbane City Council's 2018-19 budget of $3.1 billion with another $200 million left to spend on the project.

Upgrades to Kingsford Smith Drive have caused rolling lane closures, a slowed speed limit and significant congestion.

However, Lord Mayor Graham Quirk said the Kingsford Smith Drive works were on deadline.