How much does a timber deck cost in Sydney?

Timber deck costs in Sydney typically range from $395–$510 per square metre installed, depending on the timber species. Merbau (entry-level hardwood) starts around $395/m², Blackbutt around $455/m², Spotted Gum around $465/m², and Ironbark around $510/m². Use the Tillow Built deck designer for an instant estimate tailored to your project.

How much does a composite deck cost in Sydney?

Composite decking (such as Modwood) in Sydney costs approximately $545 per square metre installed. While the upfront cost is slightly higher than hardwoods, composite decking requires virtually no maintenance — no oiling, sanding, or staining — saving money long-term.

What factors affect deck building costs?

Key factors include deck size (square metres), timber or composite material chosen, deck height off the ground, shape complexity (L-shape or curved decks cost more), and extras like balustrades, stairs, pergolas, or demolition of old decks. Site access and soil conditions also play a role.

How long does it take to build a deck in Sydney?

Most residential decks take 1–3 weeks to build depending on size and complexity. Simple ground-level decks may be completed in under a week, while larger elevated decks with balustrades and stairs can take up to 3 weeks. Contact Tillow Built for a free on-site assessment and timeline estimate.

Tillow Deck Studio · Sydney

Design your
dream deck,
and watch it come to life.

A simple, beautiful design tool for outdoor decks — from a single garden platform to a multi-level cabin terrace. Pick a style, sketch the shape, choose your timber. See your build in real time, then get a transparent quote from our team.

1-5 minutes

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2026 Sydney prices

Reference — Coastal Cabin · NSW

Deck 26m² 1.2m high Spotted Gum

Balustrade per NCC 2022 (≥1m height)

— Step 02 / Create

Make it yours.

Tweak the shape, materials, and finish. Watch your build come to life.

— Step 1 of 4 / Build order

Shape & Size

Pick a deck shape and size. Use “Along house wall” for the dimension that runs across the house, and “Out from house” for how far the deck extends. The subframe rebuilds automatically.

Deck Shape

Along house wall (m) 4.0 m

How wide the deck runs across the house frontage (parallel to the wall).

Out from house (m) 3.0 m

How far the deck extends out from the house wall (perpendicular).

Elevation above ground (m) 0.6 m

Site slope (drop at far edge, m) 0.00 m

Use this when the ground falls away from the house. Lengthens far-edge posts.

Additional levels

Footings

Footing Type

Spacing centre-to-centre (m) 1.8 m

Footing depth (mm) 600 mm

Footing diameter (mm) 300 mm

Posts

Post Size

Post Material

Beams

Beam Size

Doubled (laminated 2-ply)

Beam Material

Joists

Joist Spacing (mm centres)

Joist Size

Joist Material

Decking

Pick a board material from the strip above, then set direction and finish.

Board Direction

Balustrade

Include Balustrade

Balustrade Material

Stairs

Add one or more staircases. Each stair has its own footprint and elevation.

Fixings

Deck Screw

Fixing Pattern

Joist Hanger

Step 1 of 3

Pick your deck shape to begin

The off-white house is your anchor. Choose a shape and your deck appears in place.

Your deck (live)

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Dimensions
Plan area	12.0 m²
Perimeter	14.0 m
Elevation	0.6 m
Materials (foundation → fixings)
Footings — ×	$0
Posts — lm	$0
Bearers (F7) — lm	$364
Joists — ×	$256
Merbau — m²	$1,740
Balustrade — lm	$0
Fixings & hardware	$120
Labour (est.)
Build & install	$1,520
Staircases 0 ×	—
Subtotal	$4,000
GST (10%)	$400
Total (indicative)	$4,400

Indicative only. Prices shown do not reflect real site conditions and may vary upon site inspection.

Get a custom quote in 1 business day

Sydney decks $395–$545/m² installed · most projects $8k–$40k.

No spam · Tillow Built · Licensed NSW builder · 150+ Sydney projects

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Shape

Along house wall (m)

4.0 m

Out from house (m)

3.0 m

Elevation (m)

0.6 m

Include Balustrade

Plan area 12.0 m²

Total (excl. GST) $4,000

Indicative only. Prices shown do not reflect real site conditions and may vary upon site inspection.

Unlock your $ estimate Email + phone reveals it on every step. Tillow Built will follow up.

— Step 03 / Preview

Here's your deck.

Side-on render with your selected materials. Final dimensions and pricing are below. We'll send a full itemised PDF to your inbox.

Your Details

Estimated investment Indicative

— total

Materials & install · inc GST · ±10% pre site visit

Numbers above are an automated estimate based on Sydney mid-2026 supply rates. They are not a contract. Final pricing requires a site visit and a written quote.

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Deck designer is only available on desktop and computer

Design your
dream deck,
and watch it come to life.

Make it yours.

Shape & Size

Footings

Posts

Beams

Joists

Decking

Balustrade

Stairs

Fixings

Pick your deck shape to begin

Your deck (live)

See your live estimate

Get a custom quote in 1 business day

Thanks — we've got it.

Shape

Along house wall (m)

Out from house (m)

Elevation (m)

Here's your deck.

Your Details

Draw your deck shape

Add a staircase

Design your dream deck, and watch it come to life.

Make it yours.

Shape & Size

Footings

Posts

Beams

Joists

Decking

Balustrade

Stairs

Fixings

Pick your deck shape to begin

Your deck (live)

See your live estimate

Get a custom quote in 1 business day

Thanks — we've got it.

Shape

Along house wall (m)

Out from house (m)

Elevation (m)

Here's your deck.

Your Details

Design your
dream deck,
and watch it come to life.