A gas leak at Elite Fitness on Cowper Road on Gilwilly Industrial Estate in Penrith has been closed off and the cordon lifted.
The incident was believed to have been the result of a car having its handbrake incorrectly applied and rolling into the building.
A 100m cordon was put in place as a precaution.
No one was injured.
Police would like to thank people in the area for their patience.