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Plan your deck in Australia

Measure your deck, then use our calculators to count boards, joists and supports and estimate costs in AUD. Compare composite boards and aluminium frame systems, and find Australian suppliers.

Updated 30 Oct 2026 Australia · prices in AUD 7 sources
Compare Composite decking in AustraliaComposite decking blends plastic with wood fibre, bamboo or mineral fillers. Compare Aluminium deck framesAn aluminium deck frame replaces timber bearers and joists with extruded aluminium sections, often on adjustable pedestals. Calculator Decking calculatorEnter your deck length and width, board size and gap. Calculator Decking cost calculatorThe calculator counts materials from your deck size, then multiplies by unit prices you enter or by dated prices we have verified. Calculator Decking boards calculatorRows = deck width ÷ (board width + gap). Guide How to build a deck in AustraliaCheck approvals first (height, size and location rules vary by state and council), then set out footings or pedestals, build a level frame to the spans in AS 1684 or the frame maker’s tables, and fix boards to the manufacturer’s spacing and gaps.. Directory Australian decking suppliersThese Australian companies make or sell composite decking, aluminium frames or pedestals. Guide How to build deck stairsThe NCC 2022 Housing Provisions allow risers of 115 to 190 mm and goings of 240 to 355 mm, with 2R + G between 550 and 700 mm and no more than 18 risers in a flight. Compare Timber decking in AustraliaWoodSolutions rates merbau, spotted gum and blackbutt as Class 1 above ground, meaning more than 40 years. Guide Decking screwsUse hot-dipped galvanised or stainless fixings; within 1 m of a pool or 1 km of the coast, WoodSolutions requires stainless, and 316 is the usual grade there. Compare Decking tilesDecking tiles interlock on a drainage base and sit straight on a slab, tiles or a balcony, with no frame. Guide Pool deckingAround a pool, compare wet slip ratings, heat underfoot, resistance to pool chemicals and fixings. Compare Aluminium decking boardsAluminium decking boards are a walking surface made of aluminium, separate from aluminium deck frames. Guide Does composite decking get hot?Yes, in direct sun, and so does timber. Guide Bearers and joists for a deckBearers sit on the posts and carry the joists, and the joists carry the boards. Guide Deck joist span tablesTimber spans come from AS 1684 tables and aluminium spans from each maker’s own table, valid only for that maker’s parts and loads.

Where do you start with a deck in Australia?

With four decisions: the rules, the material, the frame and the cost.

  1. Rules. NSW exempts a deck of 25 m² or less, no more than 1 m above ground, at least 900 mm from the boundary. Queensland needs approval above 10 m² or 1 m. Thresholds differ by state and council, and a bushfire-prone block adds BAL rules. See how to build a deck.
  2. Material. Timber (merbau, spotted gum, blackbutt, treated pine) or composite. Compare them in timber decking and composite decking.
  3. Frame. Timber to AS 1684, or an aluminium system with the maker’s span tables. See aluminium deck frames and pedestals.
  4. Cost. No maker publishes a dated AUD price, so use your quotes in the cost calculator.

What can you rely on this site for?

Specs and rules are taken from manufacturer documents, WoodSolutions, the NCC and state or council pages, each with its date. Where we couldn’t read a source, the page says so.

What do you need to check for yourself?

Approvals with your council, the BAL for your block, the current version of each maker’s guide, and a barrier wherever a fall of 1 m or more is possible: the NCC requires a barrier at least 1 m high on a deck. A structural engineer should look at anything beyond a light domestic deck.

Find sellers in the supplier directory.

Questions

What is the difference between a deck and decking?

The deck is the whole platform; decking is the boards you walk on. We use "decking" for the surface material and "deck" for the structure.

Sources

  1. NSW Planning: Balconies, decks and patios
  2. Queensland: Decks and covered areas
  3. What needs Development Approval - Marion Council fact sheet (July 2026)
  4. ModWood FAQs | Composite Decking Questions & Answers
  5. Ekodeck Flame Fighter Decking | Tech Specs | Composite Decking
  6. Clickdeck 50-Year Structural Frame Warranty - Residential
  7. Part 11.3 Barriers and handrails - NCC 2022 Housing Provisions (ABCB)