The shed has been built within Fort Henry on Grouville Common by the Royal Jersey Golf Club to house its groundkeepers and their equipment.
Brick was chosen and approved by Planning under its existing policy of making any addition clearly apparent, although brick is used elsewhere in the fortification, which is owned by the club.
But Environment Minister Freddie Cohen has decided to change this approach.
Modern add-ons to historical buildings will be now able to be ‘disguised’ to blend in.