The provincial government says the $22.3 million restoration of the Colonial Building will respect its historical integrity.
The government says the building is scheduled to open in 2014 and it will be a flagship provincial historic site.
Work on the building's interior is expected to be done by the end of the year and includes structural repairs, new plumbing, electrical systems and washrooms, and the addition of an elevator.
Some work has already been completed including the cleaning and restoration of two ceiling murals.
The building was used as Newfoundland's first legislature starting in 1850.