What building a new home costs in Perth metro
By Nadia Delgado · Updated 2026-06-13
Ask five Perth builders what a new home costs and you will get five different numbers, often for reasons that have nothing to do with who is more expensive. Build cost depends heavily on finish level, floor plan complexity, storeys and your specific block, so a useful answer is a range tied to those factors rather than a single figure.
Typical cost bands by finish level
Based on typical Perth building rates, per-square-metre costs roughly break down like this for a single-storey home:
| Finish level | Approx. cost per sqm (A$) | What it usually gets you |
|---|---|---|
| Basic / entry level | ~1,650 | Standard fittings, minimal customisation, volume-builder inclusions |
| Mid-range | ~2,100 | Better fixtures, some layout flexibility, common for first upgraders |
| High-end custom | ~3,000 | Architect input, higher-grade materials, more site-specific design |
| Luxury | ~4,200+ | Bespoke finishes, specialist trades, full custom documentation |
A double storey adds roughly 10 to 15 percent on top of these rates, since a second level needs extra structure, stairs and duplicated services. These are broad bands, not a quote: a builder needs your actual plans and site details to price a job properly.
What actually moves the price
Floor plan shape matters more than most buyers expect. A simple rectangular footprint is cheaper to build than one with lots of corners, cantilevers or split levels, because more corners mean more framing, more roofline junctions and more places for something to go wrong on site. Storeys add cost for the reasons above, and site conditions matter a lot in Perth specifically: sandy blocks are generally cheap to build on, but reactive clay found in parts of the eastern and southern suburbs can require a more expensive footing system.
Inclusions are the other lever. Two builders quoting the “same” house can differ by tens of thousands of dollars because one includes flooring, window treatments and a driveway, and the other treats those as provisional sums or upgrades. Always ask for an itemised inclusions list rather than comparing headline prices.
Financing and payment structure
Most Perth building contracts use progress payments tied to construction stages: base, frame, lock-up, fixing and completion. Lenders that offer construction loans release funds at each stage rather than as a lump sum, so your mortgage broker needs the builder’s payment schedule early in the finance process. Ask your builder whether they use a fixed-price or cost-plus contract, since cost-plus arrangements shift more budget risk onto you and are worth understanding fully before you sign.
Budgeting for costs beyond the build itself
The build price is rarely the full picture of what it costs to end up in a finished, livable home. Landscaping, fencing, a letterbox, floor coverings not included in the build contract, and connection fees for services all add up, and they are easy to forget when a budget is built purely around the construction quote. A reasonable rule of thumb is to set aside a contingency, commonly around 5 to 10 percent of the build price, for these post-handover costs and any unforeseen site issues that surface during construction.
Getting an accurate number for your project
Building costs and finance decisions are significant financial commitments, so treat any per-square-metre figure, including the ranges above, as a starting point rather than a quote; get a written, itemised price from a licensed builder before budgeting firmly. Comparing builders on more than price also matters: reviews that consistently mention on-time, on-budget delivery are a stronger signal than a low headline quote.
Comparing quotes without getting lost in the numbers
When quotes come back from different builders, it helps to build a simple side-by-side comparison rather than relying on memory or a gut feeling. List the total price, what is included versus excluded, the provisional sum items and their caps, and the stated timeframe for each builder. Two quotes that look close on price can turn out very different once inclusions are matched up properly, and this exercise is usually what reveals the real difference between builders rather than the headline number alone.
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Questions people ask
- How much does it cost to build a house in Perth per square metre?
- Entry-level builds tend to start around the low $1,600s per square metre, mid-range finishes push toward $2,100, and high-end custom or luxury work can run from $3,000 to over $4,200 per square metre. Your actual figure depends on design, inclusions and site conditions.
- Why do two quotes for the same size house come out so different?
- Different inclusions lists, different provisional sum allowances, and different assumptions about site costs. A cheaper headline price often has more items excluded, not necessarily a cheaper build.
- What is the biggest thing that blows out a building budget in Perth?
- Site costs, especially on sloping or reactive clay blocks, and vague provisional sums for items like tiling, fixtures and driveways. Ask for these itemised before you sign.
- Does a double storey home cost more per square metre than single storey?
- Yes, usually around 10 to 15 percent more, due to extra structural work, stairs, and a second set of services running through the frame.