Does a shed more than 6 metres from the house still need a BAL rating?

We covered the CFS rule in an earlier post: if a shed is under 500m² and sits within 6 metres of the house, it has to be built to the same bushfire rating as the dwelling. So what changes for a shed more than 6 metres from the house? That’s the question we get back on most, and the short answer is: it depends on more than distance alone. For the full rules, see the CFS guide to planning and building in bushfire areas.

The problem: “more than 6 metres” gets over-read as “no rating needed”

It’s an easy rule to hear half of. People land on “past 6 metres” and mentally file it as “no bushfire requirements, full stop.” That’s not quite right, and it’s worth being precise about, because it can shape where someone decides to put a shed on their block.

What the 6-metre rule actually says

The 500m²/6m rule works one way: it forces a smaller, closer shed to match the house. It doesn’t work the same way in reverse.

Once a shed sits more than 6 metres from the dwelling, it drops out of that “must match the house” requirement. That comes directly from AS 3959:2018, Clause 3.2.3, which says a shed that isn’t attached to the dwelling, or is sited more than 6 metres away, doesn’t need to be built to the same bushfire standard as the house.

That’s genuinely useful to know. It’s also easy to over-read, so here’s the nuance:

• It means the shed no longer automatically inherits the house’s rating. A house rated at a higher BAL level doesn’t force a shed 8 metres away to match it.
• It doesn’t mean the shed has no bushfire requirements at all. If the property still sits in a bushfire-prone area, the shed can still need its own BAL assessment — just based on the vegetation, slope and hazard distance at the shed’s own spot on the block, not the house’s numbers.
• Distance from the house isn’t the same as distance from the bush. A shed further from the house but closer to a treeline out the back could come back at the same rating as the house, or higher. One tucked well away from vegetation, on flatter cleared ground, could come back lower.

The consequence of assuming “far enough away” means “no rating”

We’ve seen the assumption go the wrong way in both directions. Someone sites a shed well clear of the house, assumes that settles it, and skips checking the block’s own vegetation and slope around the shed itself. Or the opposite — someone assumes any distance at all clears them of every bushfire consideration, only to find the shed needs its own assessment because of what’s growing behind it.

Either way, the fix is the same: check the specific spot, not just the tape measure between two buildings.

Our advice

• Treat the 6-metre rule as removing one obligation, not all of them. It gets you out of matching the house — it doesn’t get you out of the block’s bushfire overlay if one applies.
• Look at what’s near the shed, not just how far it is from the house. Vegetation, slope and aspect around the shed’s actual position are what an assessment goes on.
• Get the shed’s own site checked before you commit to a spot. Moving a shed a few metres one way or another can genuinely change the outcome — worth knowing before the slab goes in, not after.

Where this leaves you

If you’re planning a shed on the Fleurieu and you’re weighing up how far to sit it from the house, that distance matters for more than just the BAL question — but it’s exactly the kind of detail worth working through with us before the design’s locked in, rather than assumed either way.

And if your shed’s own assessment does come back with a rating, the good news is it’s a manageable set of upgrades rather than a different kind of build — see our breakdown of what BAL-12.5 and BAL-19 actually mean for a steel shed.

For the fuller picture on BAL ratings generally, our earlier post is worth reading first. If you’d like us to talk through your specific block, we’re happy to help.