The shed, believed to be a workshop, at the Maddisons Rd address caught fire at 9.50pm on Sunday.
Firefighters fought to contain the blaze for nearly three hours.
Police today said the fire was not suspicious and started after "some old burn piles had reignited in the strong winds and set the building alight".
Four fire trucks and four tankers from across Canterbury were called to the blaze, which was finally contained by about 12.30am.
Another crew remained at the scene on Monday morning to dampen some hot spots.
The site was in the news three months ago when a man was shot in early July.
Police arrested two men with gang affiliations in the days after the incident.
He pleaded not guilty and elected a trial by jury.
He is next due to appear in Christchurch District Court on December 15.
A neighbour near the property said the fire was "not a nice wake-up call for us".
They were evacuated for about an hour but returned to their home quite quickly.
When asked if the building was unoccupied, she said she had not seen any activity for a while and thought whoever lived there had moved out.
