Grovedale CFA firefighting crews, with support from FRV, quickly responded to a blaze at a vacant single-storey weatherboard residence on Boundary Road in Armstrong Creek at 10:50 PM last night.

Upon arrival, firefighters found the house fully engulfed in flames, causing significant damage to the interior.

Authorities have confirmed that the house was unoccupied at the time, and there were no reported injuries.

Detectives are treating the fire as suspicious and are conducting an investigation.

Anyone with information is urged to contact Crime Stoppers at 1800 333 000 or visit www.crimestoppers.com.au.