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[section id="what-should-you-expect-from-your-home-extension-timeline" format="overview"]
What should you expect from your home extension timeline?
Planning a home extension is exciting; new space, new possibilities, and a better lifestyle for you and your family. But one of the first questions most homeowners ask is: How long does a home extension take to build? And fair enough. If you're living in the home during the build or juggling other commitments, such as school terms or upcoming family visits, knowing what to expect is essential.
While no two projects are the same, a clear process exists, and knowing how long each stage typically takes can help you plan with confidence. At Supa Group, our integrated design-and-construct model means fewer delays and clearer timelines, so you'll never be left guessing.
While the total timeline depends on things like council approvals, site conditions, and the size of your build, here's what most Supa Group clients can expect:
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[th]
Phase
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[th]
Typical Duration
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[tbody]
[tr]
[td]
Design
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4 - 6 weeks
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[tr]
[td]
Contract preparation
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[td]
8 - 10 weeks (4 - 6 months if town planning is required)
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[td]
Build
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[td]
5 - 7 months
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That might sound like a lot, but the good news is you're not doing it alone. Supa Group manages every step, from first sketches to final inspection.
[tip_box]
Fixed timeframe guarantee
All Supa Group contracts come with a fixed price, a guaranteed site start (subject to town planning) and a fixed completion date — so you’ll always know what to expect.
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[section id="stage-by-stage-breakdown-of-a-home-extension" format="overview"]
Stage-by-stage breakdown of a home extension
A home extension in Melbourne typically moves through three key stages: the design phase, contract preparation and the build. Each step has its own tasks, timeframes and approvals, all of which influence how long your house extension will take. Understanding this process helps you plan ahead and know what to expect as your project progresses from layout ideas to construction on site.
[section_inner_1 id="design-phase-4-6-weeks" format="overview"]
Design phase (4-6 weeks)
When you first contact Supa Group, our friendly team will learn about your goals and determine whether we are the right fit for you. This is an important first step in ensuring a successful outcome.
If your project is suitable, one of our experienced designers will contact you for a more detailed discussion. This may be followed up with a free in-home consultation where we discuss in more detail, your goals, aspirations, budget and what is possible on site.
Should you decide to proceed further, we'll prepare a 3D Conceptual Design, that will allow you to visualise your extension in detail and refine it during collaborative design review meetings. Once you're happy with the direction, we'll prepare a detailed cost estimate.
After a few rounds of fine-tuning, we'll finalise the concept and prepare an Order of Engagement.
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[section_inner_1 id="contract-preparation-phase-8-weeks-10-months" format="ul"]
Contract preparation phase (8 weeks - 10 months)
The contract preparation phase focuses on the checks, reports and approvals needed before your house extension can begin. This stage usually takes 8-10 weeks, or 4-6 months if town planning is required.
This phase includes the following:
- Soil tests
- Stormwater checks
- Engineering reports
- Working drawings
- Energy assessments
- Permit applications
- Any site-specific reports or surveys
These steps ensure your home extension meets all Melbourne regulations before construction starts.
[feature_link]You can read more about this process on the Victorian Planning Portal.[/feature_link]
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[section_inner_1 id="build-phase-5-7-months" format="ul"]
Build phase (5-7 months)
The build phase is where your house extension becomes a reality. Most Melbourne projects take 5-7 months, depending on size and complexity. Once construction begins, your team will work through clear stages to complete your new space.
We work through the following stages:
- Initial deposit & site setup
- Demolition (if required)
- Base stage (foundations and slab)
- Lock up stage
- Fix stage (internal walls, fittings, finishes)
- Final completion and inspection
Second-storey home extensions may involve additional lock-up and plaster stages, but most homeowners can remain in their existing home throughout the process.
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[section id="what-can-affect-your-home-extension-timeline" format="ul"]
What can affect your home extension timeline?
Every home extension in Melbourne follows a general process; however, several factors can influence the duration from start to finish.
Common timeline influencers include:
- Planning approvals -- Heritage overlays, zoning or the need for a planning permit
- Site conditions -- Soil quality, slope and access limitations
- Project complexity -- Multi-room, rear or second-storey extensions take longer
- Design revisions -- Changes after contract signing can delay permits
- Weather or supply delays -- Occasional impacts on construction schedules
These elements vary for every Melbourne home and can extend or shorten the overall extension timeline depending on your project.
[tip_box]
How to keep your project timeline on track
- Make design decisions early
- Minimise changes once the contract is signed
- Choose an integrated design-and-construct builder
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[section id="why-do-supa-group-projects-progress-more-efficiently" format="ul"]
Why do Supa Group projects progress more efficiently?
An efficient home extension timeline relies on clear communication, streamlined processes and an experienced team. Supa Group's integrated design-and-construct model brings everyone under one roof, which helps minimise delays and keep your house extension moving on schedule.
Our projects progress more efficiently because we:
- Use a single, integrated team for design, approvals and construction
- Coordinate permits and documentation early in the process
- Hold regular design review meetings to reduce late-stage changes
- Maintain strong relationships with reliable trades and suppliers
- Provide clear communication so you always know what stage your extension is in
And because we've done this thousands of times, we can spot red flags early and prevent setbacks. Supa Group specialise in extensions, not new builds or unit developments. We work quickly thanks to tested construction methods, reliable trades, internal site checks, and experienced supervisors.
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[section id="take-a-look-at-the-before-and-after-of-our-projects" format="overview"]
Take a look at the before-and-after of our projects
Seeing real examples is one of the best ways to understand how a well-planned house extension can transform a Melbourne home. Supa Group's before-and-after projects showcase how thoughtful design, careful staging and a clear build timeline work together to create new living space without unnecessary disruption.
From rear extensions and second storeys to full home extensions, these case studies highlight how our process delivers quality finishes and projects completed on schedule.
[case_studies]
See the differences
We've delivered extensions across Melbourne — always with care, and often ahead of schedule.
View all case studies
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[section id="frequently-asked-questions" format="overview"]
Frequently asked questions
[section_inner_1 id="do-i-need-to-move-out-during-my-home-extension-project" format="overview"]
Do I need to move out during my home extension project?
Not always. Many of our clients stay in their existing home throughout the process, especially if they're building a second storey or single rear extension. However, if the extension involves major work to your only bathroom or kitchen, a short-term move might be more practical.
It's worth discussing this during the design phase. A well-planned layout can allow your builder to work around essential areas like bathrooms and kitchens. In some cases, staging the building process carefully can help you remain at home while the new extension is built, saving you time and money.
There are a few other things you need to consider when planning a house extension.
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[section_inner_1 id="how-can-i-make-sure-my-project-stays-on-time-and-within-budget" format="overview"]
How can I make sure my project stays on time and within budget?
The best way to keep your home extension project running smoothly is to work with a builder who can manage design and construction together. That allows you to finalise the design early, avoid hidden costs, and ensure your project is finished on time. Our team specialises in designing and building extensions that deliver the best design outcomes without delays or budget blowouts.
Look for home extension builders with a proven track record of completing projects on time and within budget. A streamlined extension process, good communication, and experience working with local building regulations can all make a major difference. The right team can save you time, reduce stress, and leave you happy with the end result.
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[section_inner_1 id="whats-involved-in-the-initial-consultation" format="overview"]
What's involved in the initial consultation?
The initial consultation is where it all begins. It's your chance to talk through your goals, get advice from experienced professionals, and explore what's possible with your existing home. A good builder will take the time to listen, understand your lifestyle, and help you uncover the best design solutions.
It's also where you'll begin to understand how long your project will take, what the extension process looks like, and what you can expect from the building companies you're considering. This stage helps you feel informed and confident before committing to any design work.
Importantly, the initial consultation is an opportunity for both Supa Group and our clients to have an honest conversation about the potential costs involved to achieve your goals. This saves our clients a lot of time and potentially money as there is no point drawing up plans and incurring other professional costs such as engineering if the project doesn't pass the feasibility test.
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[section_inner_1 id="can-a-new-extension-be-added-to-any-house" format="overview"]
Can a new extension be added to any house?
In most cases, yes, but it depends on your site, existing home structure, and what kind of space you want to add. Some homes are ideal for a second-storey extension, while others are better suited to expanding outwards at ground level.
A designer will assess your property, discuss how to lay out your space to suit your needs, and help ensure the new build ties into your existing house. The right approach will extend your living space while maintaining the integrity and flow of your Melbourne home.
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[section id="speak-with-supa-group-to-get-a-clear-extension-timeline" format="overview"]
Speak with Supa Group to get a clear extension timeline
A smooth house extension begins with clear expectations and the right guidance. With Supa Group's integrated design-and-construct approach, you'll know exactly how your project will progress, from early planning to the final inspection, with a defined timeline tailored to your Melbourne home.
If you want clarity around how long your home extension will take and what each stage involves, our team is ready to walk you through the process and discuss what's possible for your space.
[free_consultation]
Let’s plan your extension together. Our design consultants will communicate with you by phone, Zoom or meet you at your home to discuss what’s possible — and when.
[/free_consultation]
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