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Design my deck free
A light-grey composite deck with a glass balustrade, the sea beyondIllustration, colours indicative

Design your composite deck in a minute

Pick a shape, set the size, choose a board. You get a drawing and a 3D view free, with 80 composite and PVC boards from 31 brands priced for your state.

4.8 × 3.6 m17.3 m²
Shape
Size, in metres, from 1 to 12
along the house
out from the house
ColourBlackbutt
Start another way: describe it, snap a sketch or upload a plan

From a size to a framing plan in a minute

Give it a size and a board. The designer frames the deck at spans a structural engineer has checked, counts every board, joist, clip and bag of concrete, plans each cut and tells you what to fix.

The starting deck, 4.8 × 3.6 m, as the designer works it out:

Framing planIn the deck pack
Concept framing plan of a 4.8 × 3.6 m deck, house wall at the top: joists 90×45 at 432 mm centres; bearers 2/190×45, 4 lines; 12 × 90×90 posts on 12 pads, 300–400 mm square. Boards shown over the left part.
Joists
90×45 at 432 mm centres
Bearers
2/190×45, 4 lines
Posts
12 × 90×90 on 12 pads, 300–400 mm square
Joist spacing for composite decking
The same deck in 3DFree
The same 4.8 × 3.6 m deck in 3D from the yard, the house along the back: NewTechWood Terrace 138 × 25 boards (colour indicative) over the left part, and under the rest the frame the plan draws: joists on bearers, posts on footings.

Seen from the yard, the house along the back. In the designer’s 3D view a switch shows the frame under the boards, like this, in any composite or PVC board we profile.

Steel or timber frame?
Materials listIn the deck pack
The first line of each kind of material for the 4.8 × 3.6 m deck
26NewTechWood Terrace 138 × 25 — Blackbutt5.4 m lengths
12Joists — 90 × 45 MGP10 H43.6 m lengths
63 bagsConcrete mix20 kg bags
4 boxesHidden deck clipsTo suit NewTechWood Terrace 138 × 25, box of 100
12 mFascia boardMatching composite fascia — Blackbutt, ≈ 115 mm deep

And 9 more lines, down to the stirrups and the screws.

Decking calculator
Cut listIn the deck pack

  • 26 decking boards 5.4 m → 4.8 m, 590 mm off each

  • 12 joists 3.6 m → 3.5 m, 90 mm off each

  • 4 bearers 4.8 m → 4.8 m, used whole

Every length to buy, every cut and every offcut.

How to build a deck frame
Checks on this deckFree
  • Extra rot protection near the ground18 frame pieces sit 400 mm or less above the ground. Wood this close to the ground gets extra rot protection (H4 treatment) instead of H3.
  • Last row of boards ripped to 75 mmThe last row of boards has to be ripped (cut down lengthwise) to 75 mm wide — a full board is 138 mm. To finish on a full board, make the deck depth (out from the house) 78 mm smaller (3522 mm) or 63 mm larger (3663 mm).
  • Council approval — VICIn Victoria every deck attached to the house needs a building permit from a building surveyor, whatever its size. A planning permit from the council is usually not needed when the floor is 800 mm or less above the ground, unless a heritage or other overlay applies.
  • Free, with no account: the drawing, the 3D view, the checks and a price band for your state.
  • In your free deck pack: the concept framing plan, the materials list and the cut list. It unlocks with your contact details and a texted code.
Build my deckHow the designer works

Concept plan, not for construction.

See your deck on your own house

Design your deck free, then add a photo of the back of your house. Our AI puts your deck on it, in your board and colour. Drag across a picture to compare.

Examples made by our AI from AI-generated photos of houses, not customers’ homes. Your pictures use your own photo. Each example is the best of several attempts. The AI doesn’t measure, so a deck often comes out smaller or larger than it was designed, and the AI can get the spot or the way the boards run wrong.

  • AI-generated photo of the back of a Californian bungalow in Sydney, before the deckAI picture of the same house with a deck in Trex Transcend Lineage, Jasper, at golden hourAI example

    Sydney · Californian bungalow

    Trex Transcend Lineage, Jasper · Golden hour

  • AI-generated photo of the back of a red-brick veneer house in Melbourne, before the deckAI picture of the same house with a deck in WoodEvo Home, Tallowwood, in daylightAI example

    Melbourne · red-brick veneer house

    WoodEvo Home, Tallowwood · Daylight

See the price and all six examples

Composite and PVC boards we recommend

The ranges featured on the deck designer, each with its price for your state.

See each board’s price where you live.

Set your state

Type your postcode or pick your state. It is kept in a cookie on this device only, never worked out from where you are.

Or pick a state
  • Priceset state

    NewTechWoodComposite

    Terrace

    • Antique
    • Blackbutt
    • Teak
    • Ipe
    • Silver Grey

    Board: 138 × 25 mmCap: CappedFixing: Hidden clips or screws

  • Priceset state

    NewTechWoodComposite

    Soho

    • Blonde Oak
    • Merbau
    • Grey Ironbark

    Board: 138 × 25 mmCap: CappedFixing: Hidden clips or screws

  • Priceset state

    WoodEvoPVC

    Advanced

    • Antique Silver
    • Blackbutt
    • Oak
    • Sandstone
    • Smoked Ash
    • Victorian Maple

    Boards: 140–200 mm wideCore: Solid coreFixing: Hidden clips or screws

  • Priceset state

    WoodEvoComposite

    Home

    • Barossa
    • Basalt
    • Charcoal
    • Hampton
    • Nordic
    • Snow White
    • and 3 more

    Board: 138 × 23 mmCore: Solid coreFixing: Hidden clips or screws

  • Priceset state

    Eva-LastPVC

    Pioneer

    • Blackbutt Natural
    • Blackbutt
    • Spotted Gum
    • Weathered Blackbutt

    Board: 145 × 21 mmCore: Solid coreFixing: Hidden clips or screws

  • Priceset state

    EkodeckComposite

    Designer Series

    • Alpine Ash
    • Ironwood
    • Backbeach
    • Leatherwood
    • Riverbank Red
    • Estate Brown

    Board: 137 × 23 mmCap: CappedFixing: Hidden clips or screws

  • Priceset state

    ModWoodComposite

    Xtreme Guard

    • Charwood
    • Fire Brick
    • Koko Brown
    • Magnetic Grey
    • Sandy Bay

    Board: 137 × 23 mmCap: CappedFixing: Hidden clips or screws

  • Priceset state

    TrexComposite

    Transcend Lineage

    • Island Mist
    • Biscayne
    • Rainier
    • Jasper
    • Carmel
    • and 2 more

    Board: 140 × 25 mmCap: CappedFixing: Hidden clips or screws

See all 67 composite boardsSee all 13 PVC boardsAll 31 brands

How we pick these boards

Composite Decks picks these ranges: they are the boards we know well, and the deck designer is built around them. No brand or seller pays for the place. Each price is the average of the sellers we track in your state (the national average, marked AU, where none there prices the board yet), per square metre including GST and dated; the card’s last line says how many sellers it covers.

Ready? Build your deck

Draw it and see it in 3D in a minute, free, with boards priced for your state. The framing plan and materials list come in your free deck pack.
Build my deckPrices in your state