How Much Does an Extension Cost: A Guide

BARNES — MATINA

Our Home Extension Cost Guide

Deciding to start a home extension project can be exciting as it offers the chance to turn your living space into something that fits your style and needs. However, the financial part can be tricky and a common question is ‘how much does an extension cost’.  The truth is many factors affect the cost. Whether you want a small update, a big extension, or a new renovation, knowing the costs is crucial for good planning.

This guide gives you an overview of the costs for different types of home renovation and extension projects. We’ve broken down the costs into three main scenarios to give you examples of low, medium, and high budgets. Additionally, we’ve included prices for optional extras like landscaping, garages, eco-friendly features, and smart home technology so you can tailor the guide to your needs.

Our goal is to help you make informed decisions. By understanding what impacts project costs, you can better align your vision with your budget, prioritise spending, and identify where to save or invest more. Always consult with professionals for detailed quotes and advice to ensure your project meets expectations and follows local building rules.

Whether you’re dreaming of home changes or planning already, this cost guide will help you achieve your vision in a financially sound way.

Understanding the Scenarios

In this guide, we answer “How much does an extension cost?” with three scenarios to help you envision and budget for your project. From basic updates to luxury transformations, our aim is to cover a wide range of preferences and budgets. We also include optional add-ons like eco-friendly features and smart home systems for further customization. Remember, actual costs may vary based on project details and site conditions, so professional consultations are important.

Scenario 1: 200m² Renovation + 100m² Single-Storey Extension

Assumptions

– Renovate an existing 200m² home to update finishes and reconfigure spaces without changing the structure.
– Add a 100m² ground floor extension.
– Prices exclude GST, permits, and regulation costs.

Overview

Renovation: Kitchen, 2 bathrooms, laundry, and walk-in closet within 200m².
Extension: Add a new 100m² space at the rear.

Costs

1. Low-Cost:

Basic updates with standard materials.

Renovation Cost: $150,000 – $200,000
Extension Cost: $250,000 – $300,000

Total: $400,000 – $500,000

2. Medium-Cost:

Better quality finishes and some custom elements.

Renovation Cost: $225,000 – $275,000
Extension Cost: $350,000 – $400,000

Total: $575,000 – $675,000

3. High-Cost:

High-end finishes and luxury appliances.

Renovation Cost: $300,000 – $400,000
Extension Cost: $450,000 – $550,000

Total: $750,000 – $950,000

Scenario 2: 200m² Renovation + 100m² First Floor Addition

Assumptions

– Renovate an existing 200m² home to update finishes and reconfigure spaces without changing the structure.
– Add a 100m² first-floor addition.
– Prices exclude GST, permits, and regulation costs.

Overview

Renovation: Kitchen, 2 bathrooms, laundry, and walk-in closet within 200m².
First Floor Addition: New 100m² living space & bedrooms above ground floor.

Costs

1. Low-Cost:

Functional improvements with standard materials.

Renovation Cost: $150,000 – $200,000
Addition Cost: $300,000 – $350,000

Total: $450,000 – $550,000

2. Medium-Cost:

Upgraded finishes and custom elements.

Renovation Cost: $225,000 – $275,000
Addition Cost: $400,000 – $450,000

Total: $625,000 – $775,000

3. High-Cost:

Premium materials and luxury designs.

Renovation Cost: $300,000 – $400,000
Addition Cost: $500,000 – $600,000

Total: $800,000 – $1,000,000

Scenario 3: Demolish Rear, 100m² Renovation + 150m² Double-Storey Extension

Assumptions

– Demolish the rear of the original dwelling, fully renovate remaining 100m².
– Add a 150m² double-storey extension.
– Prices exclude GST, permits, and regulation costs.

Overview

Renovation: Kitchen, 1 bathroom.
Extension: 3 bedrooms, 2 bathrooms, open plan living/dining/kitchen, laundry, walk-in closet.
Demolition: $10,000 – $20,000

Costs

1. Low-Cost:

Functional improvements with standard materials.

Renovation Cost: $150,000 – $200,000
Extension Cost: $337,500 – $405,000

Total: $487,500 – $605,000

2. Medium-Cost:

Upgraded finishes and custom elements.

Renovation Cost: $250,000 – $300,000
Extension Cost: $475,000 – $525,000

Total: $725,000 – $825,000

3. High-Cost:

Premium materials and luxury designs.

Renovation Cost: $350,000 – $400,000
Extension Cost: $650,000 – $825,000

Total: $1,000,000 – $1,250,000

Optional Add-Ons

– Outdoor Living Space: $10,000 – $50,000
– Landscaping: $10,000 – $50,000
– Sustainable Features: $5,000 – $40,000
– Smart Home Technology: $2,000 – $20,000
– Structural Reinforcement: Included in addition costs but can vary greatly.
– Accessibility/Site Constraints: $5,000 – $20,000+

Final Considerations

This guide provides a basic understanding of costs, but actual expenses can vary based on specific project details and site conditions. Work with professionals for detailed quotes and advice to align your vision with your budget effectively.


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