Perth house fire 'suspicious', police say

Detectives are treating a fire that destroyed a house in Perth's north as suspicious.

Fire and Emergency Services were called to the Franklin Road home in Wanneroo at 3.30am on Sunday.

After investigating the scene police say an estimated $350,000 worth of damage was caused by the fire, whereas original estimates placed the damage at $200,000.

A man is being questioned by police in relation to the incident.