Hi Divman and welcome
Everyone and their dog will give you their pennyworth on this question !!
I have a problem with up and over doors, and if you can find some way round it I would get rid of it. My Dad died because on one - something went on fire in his workshop (a similarly converted garage), blocking we guess the side entrance and it looks as if he couldn't get the up n'over door to lift before there was an explosion.
They are the spawn of the devil for workshops. They leak (water, air and heat), you cannot really secure them and they are a pig to operate from the inside and you have to leave space for them to lift.
You are very welcome to use my story in your negotiations with your gran but see if you can persuade her to allow you to remove it and replace the existing door with wooden panelling and a 'normal' door. It won't cost you much but there are so many advantages.
Electrics - I would suggest that there is a group here who aren't using a bit of grey matter. They are making the point that you will only be using one piece of electrical machinery at a time, but then saying you need to have a 40A supply. Bit of logic, please guys. An ordinary 2.5mm^2 t&e supply is all that is required - after all that has a 23A capacity and with a suitable slow blow (C type) 15A or 20A mcb will satisfy all amateur workshop requirements. I run a 3 hp table saw off such a cable from the house, via a local CU, without any problems and the start up current on that is pretty high.
Flooring - go to Costco (and I'm sure there's other outlets) and get packs of their interlocking 600mm rubber flooring ; excellent - insulation, soft on the feet, safety for dropped tools.
And insulate, insulate, insulate - it'll make a huge difference to your comfort out there.
OW
Everyone and their dog will give you their pennyworth on this question !!
I have a problem with up and over doors, and if you can find some way round it I would get rid of it. My Dad died because on one - something went on fire in his workshop (a similarly converted garage), blocking we guess the side entrance and it looks as if he couldn't get the up n'over door to lift before there was an explosion.
They are the spawn of the devil for workshops. They leak (water, air and heat), you cannot really secure them and they are a pig to operate from the inside and you have to leave space for them to lift.
You are very welcome to use my story in your negotiations with your gran but see if you can persuade her to allow you to remove it and replace the existing door with wooden panelling and a 'normal' door. It won't cost you much but there are so many advantages.
Electrics - I would suggest that there is a group here who aren't using a bit of grey matter. They are making the point that you will only be using one piece of electrical machinery at a time, but then saying you need to have a 40A supply. Bit of logic, please guys. An ordinary 2.5mm^2 t&e supply is all that is required - after all that has a 23A capacity and with a suitable slow blow (C type) 15A or 20A mcb will satisfy all amateur workshop requirements. I run a 3 hp table saw off such a cable from the house, via a local CU, without any problems and the start up current on that is pretty high.
Flooring - go to Costco (and I'm sure there's other outlets) and get packs of their interlocking 600mm rubber flooring ; excellent - insulation, soft on the feet, safety for dropped tools.
And insulate, insulate, insulate - it'll make a huge difference to your comfort out there.
OW