In C/AS1, at what size does a garage (2 cars, 3 cars, 4 cars…) become a “workshop” requiring fire separation from the sleeping spaces?
C/AS1 does not require fire separation of the garage of a dwelling unit but it doesn’t mention relative size.
Intuitively, a garage for 2 or 3 cars is a reasonable garage for an average house of 2 or 3 levels. But what if the dwelling is the same size or smaller than the garage?
For example, on a lifestyle block the owner wants to built a detached hobby garage/workshop for 3 to 4 cars and create a small dwelling unit above part of the double height building.
My thoughts are:
If the garage is for the exclusive use of the occupier then it does not require fire separation (ie C/AS1). OK for 1 maybe 2 cars, but what if it’s a large, double height and the occupant is a single person with a car collection?
If not, then it is C/AS2.
What does the fire community think?