Garage side windows

[Landycat]

I'm extending my garage to within about 60cm of the boundary fence,the garage will be no bigger than the 30 square metres allowed before the building control people get interested,but I remember reading somewhere that if it's within a metre of a boundary that it must be built "substantially of non-combustible materials" to prevent the spread of fire.

Am I allowed to install a window on the side of my garage,within 1 metre of the boundary or would it be a fire risk?

 

[^woody^]

//www.diynot.com/forums/viewtopic.php?t=260264

 

[Landycat]

Thanks for the link,I've had a look at the pdf but unfortunately I'm none the wiser about whether I should fit a window or not,or whether any of those rules apply to this type of structure.