Decking & Outdoor Renovations

It depends mostly on how far the deck sits above ground, and the threshold is low enough that plenty of decks people assume are exempt are not. Adding a roof changes the assessment. So does building close to a boundary, where setback rules and construction requirements come into play. Because the exemptions have conditions attached rather than being a single height rule, the reliable move is a check with the relevant council before anything is ordered.

Durable hardwood outlasts treated pine in most exposed positions, though the gap narrows when the pine is well detailed and the hardwood is neglected. The thing that wears decking here is not rain, it is the cycle. Wet then baked, repeatedly, which is what opens checks in the surface and pulls boards out of shape. Composite avoids the coating maintenance and holds colour, but it gets hot underfoot in full sun. Position and aspect drive the decision as much as the material does.

Once the drop from the deck surface passes a defined height, yes. Below that it is a choice. Where a balustrade is required it has to resist load, which rules out anything decorative that was not designed for it, and the gaps have to be small enough that a child cannot pass through. There is also a climbability requirement, which is what makes a horizontal-slat balustrade a problem despite how often it appears in photographs.

If the property sits in a designated bushfire prone area, construction has to match the bushfire attack level assessed for the site. For decks that mainly controls which timbers are permitted and how the structure is detailed, because the realistic threat is ember attack rather than flame contact. Embers collect in gaps, under the deck, and in debris against the house. At higher ratings the permitted species list narrows considerably and some common decking options drop off it. The assessment comes first, then the material choice.