Arson Squad detectives have charged a 28-year-old man after he allegedly broke into a Barragup home and stole guns before setting it alight.
The man is accused of setting fire to the home on Fiegert Road on January 20, causing a damage bill of $700,000.
Police allege the man had attended the home on previous occasions, breaking in and stealing property, including a number of firearms.
The guns were later found by police in the Canning River after they received information from members of the public.

The man is also accused of setting fire to a stolen red Holden VF SS Commodore, valued at about $70,000.
The car was found totally destroyed by fire on January 21 at a car park on Memorial Drive in Bayswater.
The 28-year-old Thornlie man has been charged with two counts of criminal damage by fire, one count of burglary and commit, one count of stealing and one count of stealing a motor vehicle.
He was refused bail and is next due to appear before the Perth Magistrates Court on February 23.
Arson Squad detectives urge anyone with any information relating to suspicious or deliberately lit fires to contact Crime Stoppers on 1800 333 000 or online at www.crimestopperswa.com.au
Rewards of up to $25,000 are available for information that leads to the identification and conviction of an arsonist.
Pop-up ice skating rink glides back into Mandurah for winter school holidays
Federal opposition leader Angus Taylor sits down with local business owners in Mandurah
Police search for missing man last seen leaving Rockingham Hospital
West Aussies urged to be on high alert after surge in winter house fires
New $3.4 million boardwalk to be constructed at Lake Clifton thrombolites
City of Mandurah rolls out new tactile bin lids, accessibility stickers to support residents with low vision
Driver dies in hospital after Australind crash
Welfare concerns for woman with dementia last seen in Cooloongup
Charges laid over fatal West Coolup crash