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If you consider an additional room in your house? Among the most effective methods of enhancing the value of your property. It is  enhancing your lifestyle. It will save you from the trauma associated with moving is a home extension. 

However, prior to setting out to plan for that ideal extension in your mind, you must ask yourself — what is the cost of a house extension?

In this article, we will explain why house extension costs in Australia. As they are and provide you with a good estimate of what to expect.

What Is a House Extension?

A house extension is where you extend space in your current home by building outwards or upwards. It might be an additional bedroom. It will have a larger kitchen, where have a living room, or even it is a second story.

Additions are a popular option for growing families such as  home businesses. Homeowners who simply want in order to improve their home environment without relocating.

How Much Does a House Extension Cost in Australia? 

On average, it is true the prices of Australian house extensions vary from $1,900 to $4,000 per square metre. It is the ultimate price. However, It also relies on a number of factors including size, design, materials, and its location.

Here’s a quick breakdown of average house extension prices:

Basic single-storey extension: From $1,900/m²

High-end single-storey extension: From $3,000/m²

Second-storey extension: From $3,000 to $4,000/m²

For example, a 20m² ground-floor extension might cost between $38,000 and $80,000, depending on finishes and complexity.

What Affects the Cost of a House Extension?

  1. Size of the Extension

The larger the extension, the higher the overall cost. A simple room extension costs less than adding a full kitchen, bathroom, and living area combined.

  1. Type of Extension

Single-storey extensions are usually cheaper than second-storey additions because of simpler construction and no extra structural work.

Second-storey extensions require additional supports and changes to your existing structure, making them more expensive.

  1. Materials and Finishes

The quality of materials, fixtures, and finishes are great. That can significantly impact the total cost. Premium flooring as well as  custom cabinetry, or luxury bathroom fittings will increase your budget compared to standard options.

  1. Site Conditions and Access

If your property is on a sloped block or has limited access for building equipment, extra work might be needed, adding to your costs.

  1. Council Fees and Approvals

Don’t forget about local council fees, permits, and any additional inspections required for your house extension project.

Why Invest in a House Extension?

A house extension offers several benefits:

Increases your property value

Adds extra living space for your family

Allows you to stay in the same neighborhood

Customises your home to suit your lifestyle


At JDL Construction, we’ve helped countless homeowners across Brisbane in order to bring their house extension ideas to life. It is  offering expert advice, quality workmanship, and which is reliable service from start to finish.

Tips to Keep House Extension Costs Under Control

Plan your design carefully and prioritise essential features.

Get detailed quotes from professional builders like JDL Construction.

Choose standard materials and finishes where possible to reduce costs.

Consider future-proofing by extending with potential resale value in mind.

Concluding Reflections

And just how much does it cost for a house extension? Well, that really depends upon the size, type, materials, and also on level of complexity of the work. But whether you're in the market for a small room addition. It is a complete double-storey extension. It's an investment that can enhance your lifestyle and which will add value to your home.

In order to ensure accurate pricing and expert advice, you can contact JDL Construction today. Our experienced personnel can guide you through the process from beginning to end.

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