Planning to build a new home, renovate, or add an extension in 2026? Before you brief an architect, approach a builder, or stress-test your budget, you need a clear and honest picture of what your project will actually cost.
The problem with most cost guides is that they oversimplify. A single national average per m² tells you almost nothing useful - because your state, project type, floor area, finish level, number of storeys, and site complexity all move the number significantly.
This guide gives you a proper breakdown. It is built on current 2026 Australian construction market data and is designed to help design-conscious homeowners plan with clarity - not false precision.
Use the free 2026 Build & Renovation Cost Calculator
Select your state, project type, floor area, finish level, storeys, and site complexity to get an instant personalised estimate based on current market rates.
Once you have your estimate, the natural next step is finding the right architect or building designer for your project. CO-architecture matches Australian homeowners with qualified professionals based on your location, project type, and brief - at no cost to you.
Let Us Help You Find the Right Professional
Not sure where to start with finding a builder, architect, or interior designer? We've got you covered. Our network includes trusted, experienced professionals who understand the Australian building landscape — and your unique vision.
Get Matched With the Right ProfessionalWhat the estimate includes and what it doesn't
The calculator covers construction costs only. All figures include GST, builder margin, and preliminaries.
Not included:
- Land purchase price and stamp duty
- Council fees and development application costs
- Landscaping, driveways, and external works beyond the building envelope
- Furniture, appliances, and window furnishings
- Utility connections (water, gas, electricity, NBN)
The 15% contingency shown in the calculator output is the industry standard. Construction projects regularly encounter the unexpected — reactive soil, hidden structural issues, material substitutions, or council-required design changes. Budget for it before you need it.
2026 construction costs at a glance
Based on current market data, here is what Australian homeowners are paying in 2026.
| Project type | Basic | Standard | High-end |
|---|---|---|---|
| New build | $2,300 – $3,400/m² | $3,300 – $4,700/m² | $4,800 – $7,200/m² |
| Renovation | $2,400 – $3,600/m² | $3,700 – $5,300/m² | $5,200 – $7,600/m² |
| Extension | $2,200 – $3,300/m² | $3,200 – $4,600/m² | $4,700 – $7,000/m² |
Rates shown for NSW. Other states vary — use the calculator above for your state. All figures include GST.
Notice that renovations often cost more per m² than new builds. That is not a typo — it reflects the reality of working within an existing structure. More on that below.
What's driving construction costs in 2026?
Australia's construction sector has been through significant upheaval since 2020. Labour shortages, material cost inflation, builder insolvencies, and new energy compliance requirements under the National Construction Code have all left their mark.
Building a new home in Australia now costs 47% more than it did before the pandemic. Costs have stabilised somewhat after the volatility of 2022–23, but they have not come back down. The 2026 market is characterised by higher baseline costs, cautious builder pricing, and persistent trade shortages in most capital cities.
Understanding what moves the dial helps you make smarter decisions from the outset.
The 6 key cost drivers
1. Location and state
Labour rates, material supply chains, and regulatory requirements differ meaningfully across Australia. NSW and ACT sit at the high end nationally, driven by strong trade wages, high construction demand, and strict compliance requirements. SA and TAS tend to be more affordable. Within each state, inner metropolitan areas typically carry a 10–20% premium over outer suburbs and regional locations.
2. Project type
New builds offer the clearest cost picture. You start from scratch with a defined scope, clean site, and no hidden surprises.
Renovations carry inherently more risk. Working within an existing structure means encountering the unknown — outdated wiring, plumbing that doesn't meet current codes, asbestos in older homes, and the logistical complexity of sequencing work around what's already there. This is why renovation cost per m² regularly exceeds new build cost per m².
Extensions sit in between — you are adding new floor area, but inheriting the constraints of the existing building: tie-in to the existing structure, services, roofline, and weatherproofing.
3. Size and layout
Cost per m² is not linear. Smaller homes tend to cost more per square metre because fixed costs — foundations, scaffolding, roof structure, council approvals — are spread across fewer metres. A home with multiple bathrooms, an ensuite, and a laundry costs more per m² than a simpler layout of the same total size.
4. Level of finish
The difference between basic and high-end finishes can add $2,000 – $3,000/m² to the same building.
| Finish level | What's included |
|---|---|
| Basic | Project-grade fittings, laminate or vinyl flooring, standard cabinetry |
| Standard | Engineered stone benchtops, semi-custom joinery, quality tapware |
| High-end | Custom cabinetry, imported stone, premium tiling, bespoke details throughout |
Fit-out and finishes represent around 25% of total construction cost — and it is the category most within your control.
5. Number of storeys
Moving from single to double storey adds upper-floor framing, a staircase, and additional structural engineering. This typically adds 15–20% to base construction costs. Three or more storeys introduce engineered floor systems and more stringent fire compliance requirements.
Double-storey builds can make strong economic sense on smaller or higher-value blocks — the additional cost per m² is often significantly less than the cost of purchasing more land.
6. Site complexity
A flat, clear block with good soil is the baseline. From there:
| Site condition | Cost premium |
|---|---|
| Standard — flat, good soil, easy access | Baseline (0%) |
| Slightly sloping — some cut & fill or retaining required | +7% |
| Steep — significant slope, difficult access, complex footings | +15% |
| Heritage / complex — overlay, existing structure, or highly constrained site | +20% |
A steeply sloped site can require significant cut and fill, retaining walls, and a more complex foundation system — costs that are often invisible until soil testing and engineering reports are completed.
Where does the money go? Cost breakdown
Understanding how construction costs are distributed helps you see where finish-level and design decisions have real leverage.
| Cost category | Typical share |
|---|---|
| Structure & framing | 26% |
| Fit-out & finishes | 25% |
| Mechanical (plumbing, electrical, HVAC) | 18% |
| Site works & foundations | 13% |
| Windows, doors & external | 9% |
| Professional fees | 9% |
Fit-out and finishes is the category most responsive to your specification choices. Mechanical systems are largely fixed regardless of finish level. Site works is the category most prone to blowing out on difficult sites — get a soil test and engineering advice before you commit.
New build, renovation, or extension?
This is one of the most consequential decisions a homeowner faces, and the right answer is rarely obvious from the outside.
Renovation makes sense when:
- The existing structure is fundamentally sound
- You are in an established suburb where the land value is high and the footprint is appropriate
- The scope of work is cosmetic or moderate — kitchens, bathrooms, internal reconfiguration
- Heritage or character overlay controls limit what can be built on the site
- Your attachment to the existing home and neighbourhood has real value
New build makes sense when:
- The existing structure has significant defects or is nearing end of life
- You want a home designed entirely around your life, orientation, and future needs
- Energy efficiency and full NCC compliance are priorities
- The cost of bringing the existing building up to current standard approaches replacement cost
Extension makes sense when:
- The existing layout works well but you simply need more space
- Your site has room to grow without sacrificing outdoor amenity
- You have strong emotional attachment to the existing home
The right call is something a good architect will help you reach quickly. A single honest conversation about your goals, your site, and your budget will cut through the uncertainty faster than any online guide.
2026 cost reference by state
| State | New build (standard) | Renovation (standard) | Extension (standard) |
|---|---|---|---|
| NSW | $3,300 – $4,700/m² | $3,700 – $5,300/m² | $3,200 – $4,600/m² |
| VIC | $3,100 – $4,500/m² | $3,500 – $5,100/m² | $3,000 – $4,400/m² |
| QLD | $2,900 – $4,300/m² | $3,300 – $4,700/m² | $2,800 – $4,200/m² |
| WA | $2,900 – $4,300/m² | $3,300 – $4,700/m² | $2,800 – $4,200/m² |
| SA | $2,600 – $3,800/m² | $2,900 – $4,300/m² | $2,500 – $3,700/m² |
| ACT | $3,300 – $4,700/m² | $3,700 – $5,300/m² | $3,200 – $4,600/m² |
| TAS | $2,800 – $4,200/m² | $3,100 – $4,700/m² | $2,700 – $4,100/m² |
| NT | $2,800 – $4,200/m² | $3,100 – $4,700/m² | $2,700 – $4,100/m² |
Standard finish level. All figures include GST. Use the calculator above for basic and high-end estimates.
Hidden costs to plan for
The build cost is only part of the total project investment. Before you set your budget, make sure you have allowed for:
Before construction begins
- Soil tests and engineering reports: $1,500 – $5,000
- Architecture and design fees: 8–15% of construction cost
- Development application and council fees: $5,000 – $30,000+
- Building permit: $3,000 – $10,000
During construction
- Site connection fees (water, sewer, power): $5,000 – $20,000
- Demolition (if required): $15,000 – $50,000
- Temporary accommodation if renovating: highly variable
After handover
- Landscaping and external works: $20,000 – $80,000+
- Window furnishings: $5,000 – $20,000
- Furniture and appliances: highly variable
- Post-completion defects rectification: covered by statutory warranty
A realistic total project budget typically runs 20–35% above the construction cost alone once all associated costs are included.
Let Us Help You Find the Right Professional
Not sure where to start with finding a builder, architect, or interior designer? We've got you covered. Our network includes trusted, experienced professionals who understand the Australian building landscape — and your unique vision.
Get Matched With the Right ProfessionalTips for managing your budget
Get your brief right before you brief anyone else. The most expensive thing in construction is changing your mind after documentation has been produced. Invest time in your brief before engaging an architect, and your budget will be in much better shape.
Engage an architect early. The earlier you bring a designer into your process, the more influence they have over cost. An architect who joins at concept stage can design a home that is inherently buildable within your budget. One who joins after you've committed to a site and a scope has far less room to move.
Choose your block carefully. Flat, regular lots with good soil and existing services are significantly cheaper to build on than sloping, irregular, or constrained sites. Site cost savings can fund considerably better finishes.
Get at least three builder quotes. Construction pricing varies considerably between builders. Detailed, well-documented design drawings generate more competitive and comparable quotes — another reason to invest in good design documentation upfront.
Don't confuse base price with total cost. A builder's base price may include the structure and basic finishes only. Always ask for a full inclusions list and clarify allowances for fixtures, fittings, and external works.
Frequently asked questions
How accurate is the cost calculator? The calculator provides an indicative range based on current 2026 Australian market data. It is a budgeting tool — not a contract figure. Actual costs depend on your specific site, brief, and the market at the time of tendering. Always obtain at least three independent quotes from licensed builders.
Does the estimate include GST? Yes. All figures include GST.
Does it include land? No. The calculator covers construction costs only. Land purchase, stamp duty, and conveyancing are separate.
Does it include architecture and design fees? Professional fees are included as a component within the construction cost estimate (approximately 9% of the total). If you are engaging an architect or building designer separately — which we strongly recommend — their fees will be in addition to this figure, typically 8–15% of construction cost depending on scope and service level.
What is GFA? Gross Floor Area is the total enclosed floor area of a building, measured to the outer face of external walls. It is the standard unit used in Australian construction cost estimating.
Why do renovations cost more per m² than new builds? Renovating an existing structure involves unknowns that a new build doesn't — hidden structural defects, non-compliant services, asbestos, and the inefficiency of working around what's already there. These factors drive up labour cost and introduce variations that are difficult to price accurately at quoting stage.
How much do architecture fees add to the total cost? Architecture and building design fees typically range from 8–15% of construction cost for a full service (concept through to construction administration). On a $600,000 build, that is $48,000 – $90,000. However, good design documentation directly reduces builder risk pricing and generates more competitive quotes — so the net cost impact is often significantly lower than the gross fee.
How does CO-architecture match me with an architect? You post a project brief describing your project type, location, size, budget, and goals. CO-architecture matches you with qualified architects and building designers from our national network who are suited to your project. You receive introductions and choose who to proceed with - at no cost to you.
Ready to take the next step?
You now have a clear picture of what your project is likely to cost in 2026. The next step is getting the right professional alongside you — someone who can translate your goals into a design that is buildable, compliant, and worth every dollar.
CO-architecture connects Australian homeowners with architects and building designers matched to your specific project type and location. Post your brief and we handle the introductions.
Let Us Help You Find the Right Professional
Not sure where to start with finding a builder, architect, or interior designer? We've got you covered. Our network includes trusted, experienced professionals who understand the Australian building landscape — and your unique vision.
Get Matched With the Right ProfessionalThis guide and the accompanying cost calculator are published by CO-architecture and updated annually to reflect current Australian construction market conditions. Cost data is drawn from 2026 industry benchmarks. All figures are indicative only. CO-architecture recommends engaging a licensed architect, building designer, and independent quantity surveyor before committing to any construction contract.
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