August 27, 2025

How Much Does A Home Extension Cost

Harmony Van Kuyl

Harmony Van Kuyl

Director

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Do you want to extend your home? Whether you want more room for a family, want to build a home office, or want to add an extra piece of value to your property, home extensions are the right choice for you. However, one of the main things stopping people is understanding home extension prices. Not to worry, in this guide, we’ll explain the factors that will add to home addition costs and give you a clear idea of what you might expect to pay.

Factors Influencing Home Extension Costs

Size of the Extension

This is a no-brainer: the larger the extension, the more you’ll have to pay. You’ll be paying for more materials and labour, which will increase the whole price. Typically, home extension prices in Australia are calculated by the square metre. So the main rule of thumb is that the bigger the square metreage, the more you can expect to pay.

Type of Extension

The types of extensions you want will also have a big impact on the cost. Kinds of extensions include:

Single-story extensions

These are the most straightforward and least expensive kinds of extensions. They are typically added to the rear or side of the house.

Double-story extensions

Adding a second story will increase costs significantly due to the complexity and additional materials required, as well as extra safety precautions needed.

Garage conversions

Converting a garage into a living space can be a cost-effective option compared to building an entirely new structure.

Quality of Materials

The materials you select are also crucial for determining the overall cost of your home extension project. Using high-end materials such as luxury tile, premium countertops, and hardwood floors will increase costs. Choose your materials carefully and only splurge on the materials you really want. This will keep down any superfluous home extension prices from draining your budget.

Location

The location of your homestead can also affect home addition costs. Construction costs tend to be higher in urban zones due to increased labour and material costs. The specific cost of permits and approvals in your council can also add to the expense.

Design and Features

The complexity of your extension’s design and the features you want will have a large impact on the cost. As an example, adding additional features like skylights, custom-made cabinetry, or high-tech electronics will increase your budget. Again, budget accordingly and make sure to be economical on the bare essentials so you can splurge on the things you want.

Labour Costs

Labour costs can vary widely depending on where you are and how high the demand for builders are in your area. Make sure to get quotes from several contractors to ensure you’re getting the best price. Get as many testimonials on different companies as possible, to make sure you’re not being fleeced by shoddy builders. If a rate sounds too good to be true, it probably is.

Costs to Consider

Whenever you embark on a new build, there are some fees you need to consider for a home extension cost. Here are a few.

Planning and Permits

Before starting your home extension, you’ll need to obtain planning permission and building permits. These costs vary widely depending on your location and the complexity of your project. Research the local council laws and factor these expenses into your budget.

Professional Fees

When you build any kind of home extension, it means hiring professionals such as architects, structural engineers, and surveyors. Don’t skimp on these services, as they make sure your home is both compliant with council regulations while being structurally sound. 

Unexpected Expenses

Set aside a contingency budget for unexpected expenses that may arise during construction. They happen in every build, and no one is exempt from it happening to them. A good rule of thumb is to allocate around 10-15% of your total budget for unforeseen costs.

Saving Money on a Home Extension

Plan Carefully

Thorough planning will help you avoid costly mistakes and changes during construction. Work closely with your architect and contractor; they are your key to developing a detailed plan that meets your needs and stays within your budget.

DIY Where Possible

If you have the skills and time, tackling some aspects of the project yourself can save money. Tasks like painting, landscaping, or even simple tiling work can be done as DIY projects to reduce labour costs on your extension.

Get the Best in Home Extensions with JVK & Sons

Hopefully, after reading this article, you will now understand how much of a valuable investment getting a home extension can be to your dwelling. Not only does it add space, it also drives up the value of your property. By understanding the factors that influence home extensions, you too can create a beautiful and functional space.

If you want reliable home extension builders, look no further than JVK & Sons. Thanks to our years of experience in carpentry and woodworking, we can create durable and beautiful extensions to every home. We are an eco-friendly home builder, and are the perfect choice for homeowners looking for reliable builders who use sustainable and waste-free practices. Want a quote? Don’t hesitate to call us.

rethinking the renovation experience

With incomparable precision and perfection their primary aim, JVK & Sons believe their work should be done efficiently and purposefully, the first time. Their friendly, respectful team of tradespeople are a reflection of their own empirical values and each tradesperson operates as an extension of Jason and Harmony’s values and in turn, their reputation. Within an industry high on waste, Jason and Harmony are continually monitoring and forecasting their working practices to move toward minimal waste, more circular building economies and the use of the most sustainable materials.

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