The fire which started at 7:30am affected the office of the Chief Executive’s Secretary, the waiting room and the registry, destroying documents and electrical appliances.
No casualty was recorded as the fire started at a time workers were yet to arrive at the offices.
It is, however feared that documents of various road construction contracts stored at the head office, might have been destroyed.
The situation affected the operations of the GHA as workers vacated the offices and were see on the compound.
Clients who were there to transact business were also affected by the fire outbreak.
When The Ghanaian Times got to the scene, personnel of the Ghana National Fire Service (GNFS) were busily in an attempt to bring the fire under control.
Afterwards, the workers cleared the affected rooms.
The Deputy Administrator, Mr Francis Hammond, told the media that important documents had been affected.
The Public Relations Officer of the GNFS, Mr Timothy Osafo Affum, told journalists that they received a distress call and immediately proceeded to the scene.
He said the fire was brought under control in 30 minutes, adding that two fire tenders, a tanker and a time table ladder were used for the operation.
Mr Affum said investigations were ongoing to determine the cause of the fire.
By Anita Nyarko-Yirenkyi