Supertrades

Extension Builders in Melbourne

Tell us what you need. Our AI helps you build a professional brief for vetted installers, and our team verifies it. Once the quotes roll in, our system automatically compares them so you get a detailed comparison of the best options.

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Serving Melbourne

How it works

Step 1

AI-assisted job brief

Describe your extension builders project using the AI assisted chat below. Our system transforms your answers into the perfect brief for local professionals.

Step 2

Smart quote comparison

Local tradespeople bid on your project while our AI analyses every offer. We highlight the top three recommendations and procvide a detailed comparison so you can choose with confidence.

Step 3

Connect and book

You get the full contact details for every installer who submitted a quote. Call your top match or any of the others to chat through the job details and get it scheduled.

AI-assisted job brief

Extension Builders · Melbourne

70+ vetted professionals for Extension Builders in our network available to quote.

Supertrades
Hi, I will help you brief your Extension Builders in Melbourne. Is this a ground-floor room, a larger living extension, or a second storey?

Local insights

We mapped the market so you don't have to

We fetched extension builders businesses in and around Melbourne from online sources, then analysed ratings, review volumes, and recent feedback with AI to surface patterns and a side-by-side comparison. Skim the numbers below, then scroll for the full rundown, review notes, and FAQs.

Snapshot - in and around Melbourne.

8

Suppliers in scope

4.7

Avg. Google rating

350

Reviews analysed

At a glance

Melbourne Extension Builders suppliers

Compare local extension builders suppliers around Melbourne in one place. Each item shows star ratings, total reviews, distance from the centre of Melbourne, and an AI-assisted analysis of real customer feedback.

  • Spacemaker Home Extensions

    Google: 5.0 / 5 · 26 reviews · 19.9 km from search centre

    AI-assisted analysis of public reviews:

    Reviewers consistently praise high build quality, strong communication, and a team that is easy to work with from design through completion. They also mention staying on budget, finishing on time, and being respectful when clients are living on site.

  • Metropolitan Extensions & Renovations

    Google: 4.6 / 5 · 9 reviews · 0.7 km from search centre

    AI-assisted analysis of public reviews:

    Customers describe this team as capable with structural and unusual renovation work, with workmanship that holds up well over time. Reviews also highlight clear communication, efficient organisation of trades, dust control, and fair pricing, though the sample size is small.

  • Supa Group Extensions

    Google: 4.7 / 5 · 104 reviews · 12.0 km from search centre

    AI-assisted analysis of public reviews:

    Reviewers repeatedly mention smooth project delivery, helpful design input, and builds finishing on budget with no surprise costs. Aftercare and follow-up stand out strongly, with several customers saying the team stayed responsive even after handover.

  • Duncan Thompson Extensions

    Google: 4.8 / 5 · 39 reviews · 11.5 km from search centre

    AI-assisted analysis of public reviews:

    Customers commonly praise organised project management, strong communication, and a design process that feels supportive for first-time renovators. Reviews also point to quality workmanship, attention to detail, and projects landing on time and on budget.

  • Extensions Unlimited

    Google: 5.0 / 5 · 70 reviews · 28.7 km from search centre

    AI-assisted analysis of public reviews:

    Feedback centres on very hands-on communication, punctual supervisors, and considerate trades who keep clients informed throughout the build. Reviewers also praise the workmanship, attention to detail, and willingness to help even after completion.

  • Period Extensions & Designs

    Google: 4.4 / 5 · 24 reviews · 10.2 km from search centre

    AI-assisted analysis of public reviews:

    Reviewers highlight a strong design-build process, clear updates, and project managers who keep sites tidy and adapt well when older homes throw up challenges. The theme is high-quality finishes and collaborative problem-solving, although the review volume is more modest than some rivals.

  • Capital Building Contractors

    Google: 4.8 / 5 · 49 reviews · 12.8 km from search centre

    AI-assisted analysis of public reviews:

    Customers describe a professional team that is patient in design, flexible when issues arise, and strong on after-handover support. Reviews frequently mention staying on budget, moving quickly without obvious quality trade-offs, and handling live-in renovations smoothly.

  • Bayside Extensions

    Google: 4.4 / 5 · 29 reviews · 9.9 km from search centre

    AI-assisted analysis of public reviews:

    The supplied reviews are very positive about professionalism, collaboration, and excellent finish quality. They also suggest the team is considerate on occupied sites, but the excerpts provided are limited and several read like trade or partner endorsements rather than detailed homeowner accounts.

Cross-Review AI Analysis

What locals are saying in Melbourne

AI-powered analysis of all of the customer reviews from multiple suppliers in the area.

Across these Melbourne extension builders, the dominant strengths are communication, organised project management, and workmanship quality. Many reviewers value builders who can guide design decisions, work within budget, and keep projects moving without leaving clients guessing about next steps. Live-in renovations are a recurring theme, with several businesses praised for being respectful, tidy, and accommodating while families remain on site. A number of builders also stand out for finishing on time or ahead of schedule and for responsive follow-up after handover. This looks like a fairly competitive local market rather than a sparse one, with multiple well-reviewed specialists and several businesses carrying meaningful review volume. Negative patterns are not strongly visible in the supplied excerpts, so the main differences here are depth of review history, strength of aftercare mentions, and how much detail reviewers give about communication and site management.

AI review notes

What public reviews mention in Melbourne

These AI-generated notes summarise public customer reviews. They do not independently establish the truth of disputed claims. Read the original reviews and any business responses on Google Maps.

    No review notes for suppliers in Melbourne.

Local questions in Melbourne

Several stand out for different reasons. Supa Group Extensions, Extensions Unlimited, Duncan Thompson Extensions, and Capital Building Contractors all have strong review volume plus repeated praise for communication, workmanship, and smooth delivery. Spacemaker Home Extensions also reads very strongly, especially for respectful service, quality, and staying on budget, though with a smaller review pool than the biggest names.

Extensions Unlimited gets especially specific praise for daily or very regular communication from supervisors, while Duncan Thompson Extensions and Spacemaker Home Extensions are also repeatedly praised for keeping clients informed. Capital Building Contractors and Period Extensions & Designs also have multiple comments about clear updates and responsive handling of issues. If regular progress communication matters most, those names look especially well supported by the excerpts.

Yes. Spacemaker Home Extensions, Duncan Thompson Extensions, Extensions Unlimited, Bayside Extensions, and Capital Building Contractors all have reviews describing respectful work around families living on site. That is a useful signal if you are trying to avoid moving out during the build.

The most repeated themes are quality workmanship, practical design help, organised project management, and good communication. Reviewers also often mention projects being on time, on budget, or both. A smaller but important theme is aftercare, with Supa Group, Capital Building Contractors, and Duncan Thompson Extensions getting explicit praise for post-handover support.

Higher review counts can give you more confidence that the praise is consistent across many jobs, which helps businesses like Supa Group Extensions, Extensions Unlimited, and Capital Building Contractors stand out. Lower-count listings can still be strong, but you may want to read more deeply and ask sharper questions because there is less public feedback to balance out exceptional experiences. Metropolitan Extensions & Renovations is a good example of a small review base with very detailed positive comments.

Period Extensions & Designs is repeatedly praised for its design-build approach and for helping families rethink layouts within existing homes. Duncan Thompson Extensions, Supa Group Extensions, and Capital Building Contractors also receive strong comments about translating client needs into practical design outcomes. Bayside Extensions and Extensions Unlimited likewise get positive mentions for design input, but with fewer detailed excerpts about the design stage specifically.

Ask who your day-to-day contact will be, how often you will get updates, and how they handle variations or unexpected issues in older homes. It is also worth asking about occupied-site logistics, cleanliness, and what after-handover defect support looks like, since those points come up often in the better reviews. Builders earning the strongest feedback here tend to be the ones reviewers say communicated clearly, managed trades tightly, and stayed engaged after completion.

Estimate house extension cost in Melbourne

Build midpoints for one house extension in Australia. Rates cover a typical design-and-construct job on a flat site. Council fees, a new kitchen, and major structural steel are usually extra unless they are part of the second-storey option.

Fitout / site
A flat site with no plumbing is cheapest. A bathroom adds wet-area cost. Tight access or a slope adds labour and engineering.
Estimated cost range
$128,000 - $192,000
≈ $160,000 midpoint

Estimates are indicative only. For an accurate price, get free quotes from local tradies above.

General information

Home Extension Builders in Melbourne

Transform Your Home with Expert Builders

If you're considering enhancing your living space, our network of home extension builders in Melbourne is here to help. Whether you need a small addition or a second storey, we connect you with skilled professionals ready to bring your vision to life.

Understanding the cost for a house extension is crucial. Our builders can provide you with a detailed house extension cost calculator to help you plan your budget effectively. With Supertrades, you can compare quotes from various builders for house extensions, ensuring you get the best value for your investment.

Why Choose Home Extension Builders?

  • Expertise in residential renovations
  • Custom designs tailored to your needs
  • Reliable and licensed professionals
  • Transparent pricing and detailed quotes

Our renovation and extension builders are experienced in all types of projects. From straightforward extensions to complex second storey builds, we’ve got you covered. Get started today and turn your house into the dream home you deserve.

What shapes your house extension quote

Type

1 / 3

Type

Ground-floor room versus a living extension or a second storey.

Frequently asked questions

Generally, extending your home can be cheaper than building a new one, as it utilises existing foundations and structure.

The cheapest way to extend your home often includes simple additions like a sunroom or a small deck, which require less structural change.

On average, the cost of a house extension in Australia ranges from $1,500 to $3,000 per square metre, depending on the complexity and materials used.

While it is possible to build a house for $300,000 in some areas, it often depends on the location, design, and materials.

Yes, $400,000 can be sufficient to build a house, particularly in regional areas, but costs vary greatly based on design and location.

In many cases, buying an existing home can be cheaper than building new, especially considering land costs and construction expenses.

The most affordable way to build a house often involves choosing a straightforward design and utilising cost-effective materials.

Poor maintenance, undesirable locations, and structural issues are key factors that can decrease property value.

Typically, a simple, single-storey design with basic finishes is the cheapest type of house to construct.

Building up can often be more cost-effective in urban areas where land is limited, as it maximises existing space.

Yes, it is possible to do an extension for $50,000, particularly for smaller projects or straightforward designs.

A 3 metre extension can add significant value and space to your home, making it a worthwhile investment if planned properly.

For tradies

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