Masterton Town Hall and the district council offices are being assessed by a structural engineer to determine earthquake vulnerability.
A full structural engineering report is under way for the 100-year old municipal building, which has an earthquake rating of 40 per cent of the existing building code, just above the legal requirement of 34 per cent.
Masterton District Council spokesman Sam Rossiter-Stead said the council would not know the costs of strengthening the building until it received the report from the structural engineers, but that the council aims to increase the building's rating to 67 per cent following interior renovation.
He said there was a fund of $2.5million set aside for earthquake strengthening of MDC-owned buildings.
Chief executive Pim Borren said it was prudent to consider the long-term future of the building before investing in any improvements to the public and staff areas.