Home Renovation & Extension Cost Guide
Deciding to start a home renovation and 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 a basic 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 at the end 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.
For an obligation free initial discussion to explore your project give us a call or hit the link below and drop us a line.
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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 customisation. Remember, actual costs may vary based on project details and site conditions, so professional consultations are important.
To give you an idea of what is included:
Low-cost would include standard builder range items with little to no customised features.
Medium-cost would include upgraded items and additions like floor to ceiling tiles in wet areas, engineered stone/porcelain benchtops throughout and some custom joinery and upgrade features.
High-Cost would include fully upgraded and custom additions like premium marble tiles, premium French Oak flooring, marble benchtops and custom fitouts, joinery and upgrade features like skylights, an outdoor kitchen/BBQ area, etc.
Scenario 1: 200m² Renovation + 100m² Single-Storey Extension
This scenario describes a situation where there is an existing 200m2 home that is to be renovated as well as adding a 100m2 ground floor single storey extension onto the existing home.
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
This scenario describes a situation where there is an existing 200m2 home that is to be renovated as well as adding a 100m2 first floor extension on-top of the existing home.
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: $325,000 – $375,000
Total: $475,000 – $575,000
2. Medium-Cost:
Upgraded finishes and custom elements.
Renovation Cost: $225,000 – $275,000 Addition Cost: $425,000 – $475,000
Total: $650,000 – $800,000
3. High-Cost:
Premium materials and luxury designs.
Renovation Cost: $300,000 – $400,000 Addition Cost: $550,000 – $650,000
Total: $850,000 – $1,050,000
Scenario 3: Demolish Rear, 100m² Renovation + 150m² Double-Storey Extension
This scenario describes a situation where there is an existing home that is to be renovated, the rear of the existing home is to be demolished and a 150m2 double storey extension is added to the rear of the existing home.
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: $350,000 – $450,000
Total: $500,00 – $650,000
2. Medium-Cost:
Upgraded finishes and custom elements.
Renovation Cost: $275,000 – $350,000 Extension Cost: $500,000 – $550,000
Total: $775,000 – $900,000
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 will 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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Are you asking how much will my renovation and extension cost? Take the first step towards your dream home today. Contact us to schedule a consultation and discover how we can make your renovation or extension project a stunning reality.