A year-long project will begin shortly to repair the Beehive's leaky roof.
The copper roof has been leaking for several years, with staff on the top level often having to use buckets to catch drips on rainy days.
The Beehive houses government ministers, with the Prime Minister's office on the 9th floor and the Cabinet room on the 10th or top floor.
Parliamentary Services general manager Geoff Thorn says the $4 million project will lay new copper sheeting over the existing roof.
He says that option is cost-effective and will ensure that the building remains weather tight.
Mr Thorn says there will be minimal disruption to Parliament.