How Much Does a Home Extension Cost?

January 11, 2024

Ever wondered how much it costs to add more space to your home?

Whether you're dreaming of a larger kitchen, an extra bedroom, or a second-storey addition, home extensions are always exciting to do. However, the lingering question on every homeowner's mind is, "How much does a home extension cost?"

To make sure your home extension project is a success, you'll want to have a good handle on the financial side of things. This blog post can help you out with that, covering everything from planning to construction. We'll talk about what factors can impact your budget and what types of extensions you might want to consider based on your budget and needs.

Ready to find out how much it really costs to expand your home? Let's get started!

Understanding Home Extension Cost Perth, WA

Starting out a home extension project is an exciting venture, but the inevitable question that follows is, "How much does a home extension cost (Perth, WA area)?" The answer, much like the project itself, is multifaceted and influenced by several key factors, such as:

Scale

The scale of the home extension is a foundational determinant of the overall cost. Larger extensions cost more as they generally require more materials, labour, and time.

Complexity of Design and Construction

The design and construction of the extension really impact the costs, especially if there are unique architectural features, specialised materials, or structural modifications involved. These can make the project more complex and expensive.

Materials and Finishes

The choice of materials and finishes also has a substantial impact on the budget. High-end materials or custom finishes can elevate the overall cost of the extension. On the other hand, opting for more budget-friendly alternatives can help manage expenses.

Site Conditions

The existing conditions of your property can influence costs. If significant groundwork or modifications are needed to accommodate the extension, additional work and expenses may arise.

Additional Factors Affecting the Average Cost of Home Extension

Determining the average cost of home extension involves more than just size, complexity, and materials. There are other financial factors to consider as well.

By understanding all of these additional factors, you can make a more accurate budget and plan your home extension with more confidence. That way, you'll be better prepared for any surprises and can enjoy a smoother construction process overall.

Location

The geographical location of your property can be a silent cost influencer. Construction costs vary regionally due to factors like labour rates, material availability, and local building codes.

Permitting and Regulatory Compliance

Obtaining the necessary permits and ensuring compliance with local regulations is a crucial yet often overlooked factor. Permit fees, along with the time and resources needed for adherence to building codes, can add a significant layer of expense.

Structural Considerations

If your home extension involves altering the existing structure or foundation, the costs can rise considerably. Structural modifications require careful planning, engineering expertise, and sometimes additional approvals, all of which contribute to the overall cost.

Utilities and Services

Extending your living space may necessitate adjustments to existing utilities, such as plumbing, electrical, and HVAC systems. Adapting these services to accommodate the extension can incur additional costs, particularly if extensive rerouting or upgrades are required.

Why an Onsite Consultation is Crucial

Scheduling a consultation with a seasoned builder allows for a detailed assessment of your unique project. Builders can take into account local building regulations and codes, and site conditions. This helps ensure legal compliance and prevent unforeseen site complications.

A face-to-face consultation is not just about determining the price tag. It is also a vital step in discussing the specifics of your vision, enabling the builder to provide an accurate quote tailored to your project's nuances and aids in making informed decisions.

Different Types of Home Extensions

Here are some of the most common home extensions you may consider and their distinctive features, so you can make an informed decision that aligns with your aspirations.

Bathroom Addition

A bathroom addition can provide convenience for occupants by reducing queues and wait times, especially during busy times, and providing additional private space. Its benefits include increased property value, improved functionality, and enhanced comfort for occupants and guests.

Room Addition

Expanding your home with a room addition means creating an extra living space tailored to your needs. This versatile extension allows for various functionalities, such as a new living room, home office, or playroom, providing flexibility in how you utilise your home.

Kitchen Expansion

This type of expansion enhances functionality, provides more room for cooking and socialising, and introduces additional features like kitchen islands or breakfast nooks. Kitchen expansion focuses more on creating a more inviting and functional atmosphere while also contributing to an improved overall living experience.

Second-Storey Addition

A second-storey addition is a type of expansion that provides significant benefits, including offering extra living space without expanding the property's footprint. It is particularly advantageous for growing families, as it typically includes additional bedrooms and may accommodate a new master suite, contributing to an overall increase in your home's value.

Opt for Excellence of Perth's Prestige Renovations

Knowing and understanding the various factors contributing to overall home extension costs is important for clearer financial planning and a successful home extension journey. With this, it is also crucial to have a reliable builder.

Their expertise not only ensures accurate cost estimates to determine the average cost of home extension but also translates your vision into a tangible, budget-conscious reality.

At Prestige Renovations, we stand out as the premier choice for all your home extension needs. We are also the go-to Perth builder of stunning granny flats. What sets us apart is our personalised approach and our steadfast commitment to delivering excellence.

We recognise that every homeowner has their own unique aspirations for their living space, so our team of experts listens attentively to your ideas, ensuring that each home extension is a bespoke creation that mirrors your lifestyle and preferences. Choose us for your home extensions, and experience the pinnacle of professionalism, creativity, and reliability.

Do not let that burning question of “How much does a home extension cost?” linger. Contact us today for an accurate quotation, and let's start redefining and enhancing your living space!

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What Is a Granny Flat? Full Guide for Australian Homeowners

October 27, 2025

Granny flats are no longer just for grandparents. Across Australia, they’re being built as rental units, guest accommodation, or smart add-ons for multigenerational families. Climbing property prices and limited housing supply have made granny flats an attractive option for homeowners seeking flexibility and extra income. Before you build, there are legal and planning steps to navigate. Each state has its own council rules, and the approval process can feel overwhelming. Prestige Homes & Granny Flats provides practical guidance on paperwork, design, and construction, keeping your project organised and on track from the start. Before you start asking what granny flats are and how to build one, remember there are legal and planning steps to navigate. Each state has its own council rules, and the approval process can feel overwhelming. Prestige Homes & Granny Flats provides practical guidance on paperwork, design, and construction, keeping your project organised and on track from the start. What are Granny Flats? So what is a granny flat? The answer is simple. It’s a small, self-contained home built on the same block as a main residence. Think of it as a compact version of a regular house, usually including a kitchen, bathroom, living area, and one or two bedrooms. Most states cap their size at around 60 m², though exact limits vary. In Queensland, they’re often called “secondary dwellings,” while in Victoria, you’ll hear “dependent person’s unit.” No matter the name, the idea is the same: extra living space with independence built in. What Are Granny Flats Called in Perth? Across Perth and the wider WA region, granny flats are formally classified as “ancillary dwellings” under local council planning regulations. They’re permitted on most residential-zoned blocks that meet the minimum land size, with a maximum floor area of up to 70 m². A major difference in WA is who can occupy them. Since 2015, Perth’s rules have allowed ancillary dwellings to be rented to non-family members, giving homeowners more flexibility for rental income or family use. Councils such as the City of Perth, City of Stirling, and City of Joondalup apply these state planning guidelines, though it’s always worth checking your local council’s requirements before starting. In Perth, granny flats can take several forms. They may be built as a detached unit, joined to the main house, or created by converting existing structures like garages. This flexibility makes them an appealing way to add space, boost property value, or create rental income without leaving your current suburb. What Is Granny Flat: Legal and Planning Rules You Need to Know To fully understand what granny flats are, you also need to follow council regulations that vary from state to state. Zoning and Land Use Your block must be in the correct residential zone to allow an ancillary dwelling. Perth councils set these rules, so it’s important to confirm land use requirements before drawing up plans. Size Limits & Design In most parts of Australia, granny flats are limited to 60 m². In Perth and wider WA, ancillary dwellings can be up to 70 m², provided they meet council design codes for height, setbacks, and appearance. Approval Processes Some states require both planning and building permits, while others fast-track approval if certain criteria are met. In WA, approvals generally move faster when plans follow the Residential Design Codes (R-Codes) . Rental & Occupancy Rules Unlike some states, Perth homeowners can lease ancillary dwellings to non-family members. Since the 2015 policy change, this flexibility has allowed granny flats to serve as either rental income properties or extra family space.

Step-by-Step Custom Home Build Checklist

October 24, 2025

Building your own custom home in Australia is exciting, but it can sometimes feel like you’ve got a lot on your plate. From design choices and council approvals to budgets and timelines, there are plenty of moving parts that can quickly become overwhelming. That’s why having a clear checklist is important. We’ll guide you through the key steps in building a custom home checklist. Whether it is your first build or an upgrade to suit your lifestyle, our team helps you stay organised and confident right through to the final handover. Building a Custom Home Checklist Think of a custom home checklist as your blueprint for staying organised. It turns the chaos of construction into a sequence of manageable steps. Without a checklist, you could face delays, unexpected costs and unnecessary stress. A detailed custom home build checklist ensures a smooth, cost-effective and worry-free build. It’s not just for first-time owners either. Even seasoned homeowners upgrading to a custom space benefit from a structured approach that keeps the build on track and aligned with their vision.