building on a boundry/fire break

I am trying to do some rough drawings so that I can get a ball park figure for a small house extension. I have planned to use use a wooden floor on stumps and foam outside walls rendered to match my house. A guy I work with who lives in a different area says he was forced to build a double brick wall to support his extension as it was within 1 meter of the boundary fence. He said it was to act as a fire break. I have heard this somewhere before but cannot find any reference to it under our councils website. Does anyone know if it's a National or State wide rule or is it something that changes from area to area?
The boundary fence at our house is also against a public access path which is the width of a car. so surely that acts as a fire break in itself?
does anyone know where I can read up to find out for sure the rule without paying an Architect. As a double brick extension and deep footings will probably mean the extension will be too expensive.
Thanks:)


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