Deck Cost Calculator (Australia)

Construction · Australia

Deck cost calculator — timber, frame, fix & finish.

Pick your decking timber, set the size, choose joist centres and footings. We work out the lineal metres, the framing count, the fixings — and give you a real per-m² installed cost, not a rule-of-thumb.

Deck spec

AUD · metres

Deck size

Length board direction

Width joist span

Height above ground

Waste / cuts

Decking boards

Timber / material

Board width

Gap between boards

Board price per lineal m

A$ /lm

Std board length

Sub-frame

Joist spacing

Joist price 90×45 / 140×45 H3

A$ /lm

Bearer price

A$ /lm

# bearer rows spans of ~1.8 m

rows

Footings & fixings

Footings stumps / piers

no.

Footing cost each, incl. concrete

Fixings SS screws, joist hangers

A$ /m²

Oil / stain

A$ /m²

Extras & labour

Balustrade (auto-on for high-set) A$280/lm

Balustrade lineal m

Stairs / steps

Labour build, no demo

A$ /m²

Add 10% GST to total + GST

// installed cost, supplied & built

Roughly A$— /m² for the finished deck.

A$— per m²

Deck area

—m²

— m × — m

Decking required

—lm

— boards @ — m

Total cost

A$—

ex-GST

Cost breakdown Where each dollar goes

Decking boards A$—

Sub-frame (joist/bearer) A$—

Footings A$—

Fixings + oil A$—

Balustrade + stairs A$—

Labour A$—

GST A$—

Decking — lm × A$—/lmA$—

Joists — @ — mA$—

Bearers — lm totalA$—

Footings — × A$—A$—

Fixings (screws, hangers)A$—

Oil / stainA$—

Balustrade — lmA$—

Stairs / stepsA$—

Labour build & finishA$—

SubtotalA$—

GST 10% (if added)A$—

Total materials + labourA$—

// note Estimate only. Hardwood (merbau, spotted gum, blackbutt) and composite vary by supplier and region. Sub-frame assumes treated pine H3; joist span based on board width. Balustrade auto-includes for high-set decks. Confirm with your builder and timber supplier.