How Much Does a Home Extension Cost in Australia (2026)

Pricing reference year: 2026 · Updated 2026-05-21 · 2 min read

Discover the costs of home extensions in Australia for 2026, from $2,000 to $4,000 per square metre. Learn about regional variations, hidden costs, and tips to save money.

$2,000 - $4,000 per m² in 2026

In 2026, home extensions in Australia cost between $2,000 and $4,000 per square metre, varying by type and location.

Key takeaways

Extensions cost $2,000 to $4,000/m² in 2026.
Sydney and Melbourne are pricier than regional areas.
Plan for hidden costs like site prep and utilities.
DIY can save money but hire pros for structural work.

On this page

Typical price range in 2026
What affects the cost
Regional variation across Australia
Hidden or extra costs to budget for
How to save money
DIY vs hiring a pro
How to get accurate quotes on TaskerAsker
Related on TaskerAsker

Planning a home extension in Australia can open up new possibilities for your living space. In 2026, the cost of a home extension typically ranges from $2,000 to $4,000 per square metre. This wide range reflects the diverse factors influencing the final price, including the type of extension and location. Understanding these variables can help you budget effectively and avoid surprises.

Typical price range in 2026

Type of Extension	Low Cost	Typical Cost	High Cost
Ground Floor Extension	$2,000/m²	$3,000/m²	$4,000/m²
Second Storey Addition	$2,500/m²	$3,500/m²	$4,500/m²

Extensions are a significant investment, with costs varying widely. Ground floor extensions are generally less expensive than adding a second storey due to additional structural requirements. Consider these ranges as a starting point, and adjust according to your specific project needs.

What affects the cost

Size and Complexity: Larger and more complex projects naturally cost more due to increased labour and materials.
Materials: High-quality materials will increase costs but often provide better durability and aesthetics.
Location: Extensions in metropolitan areas tend to be more expensive due to higher labour and material costs.
Design: Custom designs by architects can elevate the price compared to standard plans.
Permits and Approvals: Council approvals can vary in cost, depending on the project and location.
Existing Structure: The condition of your current home can affect the complexity and cost of integrating new extensions.

Regional variation across Australia

The cost of home extensions varies significantly across Australia. In Sydney and Melbourne, expect to pay at the higher end of the spectrum due to demand and higher living costs. Brisbane offers slightly lower prices, while Perth and Adelaide generally fall in the mid-range. Regional areas often have lower labour costs, but transportation of materials can increase expenses.

Hidden or extra costs to budget for

Site Preparation: Clearing and preparing the site can add unexpected costs.
Utilities: Extending plumbing, electrical, and HVAC systems can be costly.
Landscaping: Post-construction landscaping to restore your garden or yard.
Temporary Accommodation: If you need to vacate your home during construction.
Contingency Fund: Always budget an extra 10-15% for unforeseen expenses.

How to save money

Plan Thoroughly: Detailed planning can prevent costly changes during construction.
Choose Standard Designs: Opting for standard designs can save on architectural fees.
Source Materials Wisely: Compare suppliers and consider recycled materials where feasible.
DIY Where Possible: Undertake non-structural tasks like painting to save on labour.

DIY vs hiring a pro

While DIY can save money on simple tasks, hiring a professional is crucial for structural work to ensure safety and compliance with building codes. DIY may suit tasks like painting or minor landscaping, but professional expertise is essential for complex projects like electrical and plumbing work.

How to get accurate quotes on TaskerAsker

To get accurate quotes for your home extension, start by posting your job on TaskerAsker. Provide detailed project specifications, including size, design preferences, and location. Verified, ABN-checked tradies will respond with competitive quotes, allowing you to compare and choose the best option for your needs. Post your job today to get started.

Want more on home extension cost Australia 2026? Browse our cost guides library, plan ahead with the budget planner, find local service providers, or read related articles on the blog.

Frequently asked questions

How much does a small home extension cost?

A small extension, around 20m², can cost between $40,000 and $80,000 in 2026, depending on materials and complexity.

Are second storey extensions more expensive?

Yes, second storey additions typically cost more, ranging from $2,500 to $4,500 per square metre due to structural requirements.

How long does a home extension take?

Home extensions can take anywhere from 3 to 12 months, depending on the project's size, complexity, and weather conditions.

What approvals are needed for a home extension?

Council approvals are generally required for home extensions, including planning permits and building approvals, varying by location.

Can I live at home during the extension?

Living at home during construction is possible but may be challenging due to noise and disruption. Some opt for temporary accommodation.

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