How Much Does Composite Decking Cost in Australia?
· Ezy Decking
Quick answer
Our composite decking boards currently work out at about $86 to $227 per square metre, supply only and before offcuts, depending on the range. Budget extra for the frame, clips and edge trims. Installation depends on your site, so get a builder's quote. The live table below shows each range per board and per square metre.
The cost of a composite deck comes down to three things: the board range you choose, the frame it sits on, and who builds it. This guide shows our current supply prices for each, pulled live from our shop, and walks through what goes into a typical 20 m² deck.
What drives the cost of a composite deck?
- The board range. This is the biggest line. Our ranges differ in core (PVC, solid or semi-solid composite), look and fire rating, and the price per board follows.
- The frame. Boards need joists underneath, and joists usually sit on bearers. You can use aluminium, H3 treated pine, or adjustable pedestals when you are building over concrete or tiles.
- Joist spacing. Closer joists mean more framing and more clips. Origin, PVC/ASA and Premium Solid boards allow joists at up to 450 mm centres; Premium Semi-Solid needs 400 mm.
- Edges and extras. Fascia or nosing to finish the edges, starter clips, screws, and steps if the deck is raised.
- Shape and offcuts. A simple rectangle that suits the 4 m or 5.4 m board lengths wastes less than an L-shape or a picture-frame border.
- Installation. Doing it yourself saves labour but takes time and the right tools. A builder's price depends on height, access and site conditions.
Supply price by range
These are our current prices, inc GST, straight from the shop. Boards are sold individually. The per-square-metre figure is the board price spread over the area one board covers (board width plus the clip gap), so it covers boards only, before offcuts.
Composite decking boards: current supply prices
| Range | Price per board | Boards only, per m² |
|---|---|---|
| Origin (PVC core, BAL29)4 m, 5.4 m lengths | from $129 per 4 m board | ≈ $226–$227 per m² |
| PVC/ASA5.4 m lengths | from $109 per 5.4 m board | — |
| Premium Solid (reversible)4 m, 5.4 m lengths | from $59.60 per 4 m board | ≈ $103–$105 per m² |
| Premium Semi-Solid4 m, 5.4 m lengths | from $49 per 4 m board | ≈ $86–$91 per m² |
Want to compare the ranges in person? Order samples (free; you pay postage, or collect from a branch) or browse the full range at composite decking.
Framing, clips and extras to budget for
Boards are only part of the bill. Every deck needs a frame and fixings, and most need something to finish the edges.
Framing, clips and trims: current supply prices
| Item | Price |
|---|---|
| 40×50 mm Ezy aluminium joist | from $89 per 4.2 m length |
| 75×50 mm aluminium joist (5.8 m) | $179 each |
| 100×50 mm aluminium bearer (5.8 m) | $199 each |
| 90×45 H3 treated pine | from $32.40 per 3.6 m length |
| 140×45 H3 treated pine | from $46.80 per 3.6 m length |
| Adjustable pedestal (18–23 mm) | $6 each |
| Hidden T-clips with screws | $40 per pack of 100 |
| Stainless starter clips | $25 per pack of 50 |
| Matching fascia 138 × 15 mm | from $40 per 4 m length |
Which frame suits you depends on the ground. Over soil, the frame sits on bearers raised on stirrups or footings. Over a concrete slab or tiles, adjustable pedestals lift the deck with no demolition. Aluminium joists don't rot, warp or attract termites, which makes them a good match for composite boards; treated pine is the traditional option. Our installation guide covers each method.
Worked example: what goes into a 20 m² deck
Take a simple rectangular deck 5 m long and 4 m wide, using Origin boards running the 5 m length on a frame with joists at 450 mm centres. This is the same method our deck calculator uses.
- Board rows: each Origin board covers 138 mm plus a 4.5 mm gap, so 4 m of width takes 29 rows.
- Boards: 29 rows × 5 m = 145 lineal metres, plus 5% for offcuts ≈ 152 m. That is 29 boards at 5.4 m, or 39 at 4 m.
- Joists: at 450 mm centres along the 5 m length you need 13 joists, each 4 m long, so about 52 lineal metres of joist.
- Bearers: under the joists. The number depends on the frame system and how high the deck sits.
- Clips: one hidden clip at every joist along each of the 28 joins between rows, so 364 clips (four packs of 100), plus starter clips for the first and last rows (one pack of 50).
- Edges: fascia or nosing around the exposed sides, about 18 lineal metres if all four sides show.
To turn those quantities into a price, enter your own measurements in the deck calculator. It uses live prices, lets you switch ranges and framing, and adds the materials list straight to your cart.
What about installation?
Installation costs vary from job to job. Height, access, the ground underneath, steps, balustrades and the time of year all change a builder's price, so we don't publish a per-square-metre rate. If you'd like a builder, contact your nearest branch with your plans and measurements, or read our tips on choosing the right composite decking installer. If you're doing it yourself, start with our DIY guide to composite decking.
Is composite decking worth the price?
Composite costs more up front than basic treated pine, but it doesn't need sanding, staining or sealing, and it doesn't splinter. For most people the saving is in the years of upkeep they skip. Our benefits and drawbacks guide sets out the trade-offs honestly.
Common questions
How much does composite decking cost per square metre?
Across our ranges, boards currently work out at about $86 to $227 per square metre, supply only and before offcuts. Allow around 5% extra for offcuts, plus the frame, clips and fascia. Prices are live from our shop and include GST. For an itemised total for your own deck, enter your measurements in the deck calculator.
How much does composite decking cost installed?
Installed prices vary a lot, so we don't quote a flat rate. Height, access, the ground underneath, steps, balustrades and the builder's schedule all change the labour cost. Price your materials in the deck calculator, then ask a builder to quote the labour for your site. Contact your nearest branch if you'd like help finding an installer.
Is composite decking expensive?
Composite costs more up front than basic treated pine, and premium boards cost more than entry ranges. You save it back over time because composite needs no sanding, staining or sealing and doesn't splinter or rot. Choosing a simple shape that suits 4 m or 5.4 m boards and the right joist spacing keeps the materials bill down.
How many boards do I need for a 20 m² deck?
For a 5 m × 4 m deck with boards running the 5 m length, you need 29 rows of board. With about 5% for offcuts that's roughly 152 lineal metres: 29 boards at 5.4 m, or 39 at 4 m. You'd also need about 13 joists at 450 mm centres and around 364 hidden clips. The deck calculator works this out for any size.
What else do I need to budget for besides boards?
The frame (joists and bearers in aluminium or treated pine, or pedestals over concrete), hidden clips and starter clips, fascia or nosing for exposed edges, and colour-matched screws for the fascia. Add delivery, any steps or balustrades, and installation if you're not building it yourself. The framing and extras table in this guide shows current prices.