Minn. Stat. § 299F.09: BUILDING ENTERED WITHIN REASONABLE HOURS.

The state fire marshal, chief assistant, deputies, and subordinates, the chief of the fire department of each city where a fire department is established, the mayor of a city where no fire department exists, or the clerk of a town in territory without the limits of a city, at all reasonable hours may enter into all buildings and upon all premises within their jurisdiction for the purpose of examination, after proper consent from the occupant or owner or pursuant to an administrative search warrant. If the examination occurs subsequent to a fire, entry into a building or premise is governed by section 299F.08.