Ask five builders what a deck costs and you will get five different numbers. Rightly so, because every backyard, board choice and council area changes the maths. But before you ring anyone, you can get a solid guide price for your own deck in a few minutes with our deck cost calculator. No site visit, no waiting for a callback, just a realistic starting figure based on the size and material you have in mind.
What the Deck Cost Calculator Actually Does
The calculator lets you sketch out your deck in 3D and get an instant guide price. It is built for the early-stages homeowner, the person standing in the backyard with a tape measure and a rough idea. You do not need plans, a survey or exact measurements to a millimetre. You plug in what you know, and the tool does the sums using real-world Sydney pricing.
It covers the three jobs Sydney homeowners ask us about most:
- New hardwood decks from around $440 per square metre
- Composite and pool decks from around $550 per square metre
- Restoring an existing deck from around $153 per square metre
Step 1: Measure the Area You Have in Mind
Grab a tape measure and note the length and width of the space you want to deck. If the area is an odd shape, break it into rectangles and add them together. A rough calculation is fine at this stage; a 6 x 4 metre entertaining deck and a 10 x 3 metre verandah deck both come out at 24 square metres, and the calculator prices on area rather than shape.
If you are deciding between a couple of sizes, run the calculator twice. Seeing the real difference in dollars between a 20 and 30 square metre deck is often what settles the decision faster than any brochure.
Step 2: Choose Your Board and Deck Type
Material choice is the single biggest price driver after size. Hardwood such as spotted gum, blackbutt or ironbark sits at around $440 per square metre and suits homeowners who want the look and feel of real timber. Composite and pool-area decking comes in at around $550 per square metre and trades a higher upfront cost for far less maintenance over the years.
If your existing deck is structurally sound but tired, you do not need a rebuild at all. Restoration work, sanding back and re-oiling or repairing damaged boards, starts from around $153 per square metre. The calculator has that option too, which saves you from pricing a whole new deck when a revival would do.
Step 3: Design and Get Your Instant Guide Price
This is the part most quote tools do not offer. Rather than typing numbers into a boring form, you design your deck in 3D, adjusting the size and layout until it fits your backyard and your budget. The instant guide price updates as you go, so you can see what each extra square metre or a switch from hardwood to composite actually costs you.
No salesperson visits your home. No one rings you three times to chase the job. You get an honest number to work with, whether you are budgeting for next spring or calculating whether this year’s tax refund stretches to the deck you have been planning.
Reading Your Result the Right Way
A guide price and a final quote are two different things, and knowing the difference saves frustration later. The calculator figures in the factors common to most Sydney backyards, but a final quote accounts for the things only an onsite inspection can confirm: significant slope, poor access, tricky soil, stormwater points or the state of an existing frame. If your block is steep or access is tight, expect the final quote to land above the guide price.
As a rule of thumb, the guide price is accurate within a normal range for a standard block, and it is genuinely useful for comparing materials and sizes against each other. The quote then locks the number in writing.
What to Do With Your Guide Price
A price in isolation only gets you so far. A few posts worth reading next: our full 2026 Sydney deck pricing guide breaks down what sits behind the per-square-metre rates, and if you are getting conflicting quotes already, why deck quotes vary in Sydney explains where the gaps come from. Timing matters too, our seasonal build guide covers when builders are busiest and when you can save on scheduling.
Once you have a number you are comfortable with, the next step is easy. Book through the contact page or call 0433 334 415 and we will arrange a site visit to confirm the details and give you a fixed quotation. With more than 4,000 decks behind us, licensed under NSW Contractor Licence 395250C, we will tell you honestly whether your budget is realistic or where to trim.
Get Your Guide Price Today
Ninety seconds with the calculator will tell you more than a week of scrolling builder websites and collected guesses. Head over to the deck cost calculator, design your deck in 3D, and get your instant guide price. When you are ready to turn that guide price into a firm quote, 5 Star Decking is just a phone call away.
By the 5 Star Decking Team
