Queensland Deputy Premier Jackie Trad will ask the state's corruption watchdog to investigate whether she acted improperly when buying a house in a lucrative inner-city Brisbane suburb.

Key points: Jackie Trad bought the property in the same area that will benefit from the Cross River Rail project

Jackie Trad bought the property in the same area that will benefit from the Cross River Rail project The Opposition last week alleged Ms Trad had engaged in "insider trading" when buying the property

The Opposition last week alleged Ms Trad had engaged in "insider trading" when buying the property Ms Trad will also stand down from her role as the head of Cross River Rail while the investigation is underway

Ms Trad bought the property in Woolloongabba earlier this year — in the same area that will benefit from the Queensland Government's Cross River Rail project — which Ms Trad is in charge of.

The house is also in the catchment for a new inner-city primary and secondary school, making it a lucrative investment.

The Opposition last week alleged Ms Trad had engaged in "insider trading" when buying the property, and referred the case to the Crime and Corruption Commission (CCC).

After seeking advice from the Parliament's Integrity Commissioner, Ms Trad will now also ask the CCC to investigate.

"The matters raised in recent days need to be clearly resolved once and for all — I continue to refute the allegations made by the LNP," Ms Trad said.

"I want this resolved as quickly as possible and so I have decided to refer this to the CCC to consider whether it's a matter that requires investigation."

Ms Trad will also stand down from making decisions for the Cross River Rail project while the investigation is underway.

"While the matter is being considered by the CCC, I have undertaken to remove myself from any decision making involving Cross River Rail," she said.

The referral means Ms Trad is likely to avoid questioning at Budget Estimates Hearings about the controversial purchase, which start tomorrow.