Hi Tony,
I recently suffered a fire in my detached garage and workshop. This destroyed all of my tools and equipment, and most of the large brick building (24x 28 feet) had to be demolished.
Fortunately I am insured with Natwest for both buildings and contents. This covers contents up to £50,000 with no limit on contents in garage or outbuildings and I will be able to replace all of my losses. Many insurances do not cover contents of outbuildings and many others only offer limited cover, usually around £5000 Max. I looked around at various cut price insurances which are widely advertised but fortunately stuck with my original despite it’s higher cost.
It pays to check the small print just in case. In your case if you do not want to take out a complete new buildings and contents insurance I would initially talk to your insurer, they may be able to offer cover fore an additional premium. If not, for the sake of a relatively small outlay I would cancel the policy and take out a better one elsewhere. It’s worth it for peace of mind.
Below are a couple of pictures just to inspire you
Remains of garage
The intensity of the fire is demonstrated by the middle beam. This 200 x 100 I beam was straight! The Fire-fighters reckoned the temperature must have reached around 700 to 800 degrees C
Terry