Lobster wrote:

Well... never having heard the phrase before, I googled for "Hot
Works" and found that in fact it wasn't the title of a dodgy porno
movie, but rather, it included plumbing work with a blowlamp, amonst
other things. I therefore truthfully answered "yes", and since I'm
d-i-y'ing on my own property, added "no permit required" .

It's pretty much anything that requires heat. On airport sites you need a
hot works permit to use a soldering iron of the type you would use to solder
a small electrical connection.

ahem Either that or you go hide out in the car park and do it ahem

It was explained to us that it's mainly to do with the airport temporarily
disabling the smoke heads where you are working to avoid false alarms and
subsequent evacuations. Don't know how true that is.