Three fire engines attended an incident at Wickes Building Supplies on Duke’s Road in Carlisle.
Fire crews were called at 9:08am on Tuesday, 25 February.
On arrival crews found a large section of wall had collapsed into the shop causing significant damage.
A Cumbria Fire and Rescue Service spokesman said: “Fire crews cleared the debris and made the scene safe before handing over to contractors.
“Crews were on scene for approximately two hours.”