Guaranteed Home Extension Melbourne
We provide fixed-price home extensions in Melbourne, handling design, permits, and construction in 3-6 months for families needing more space, guaranteed on time and on budget. Our building solutions offer peace of mind.
The price we quote in your HIA building contract is the price you pay. This gives you complete financial certainty for your project and there are no hidden costs.
Your extension is protected by our 10 year building guarantee. We build high quality extensions that are made to last.
You deal directly with our owner, providing clear communication from the first meeting to project completion.
Free & Friendly Consultation
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Who We Help with House Extensions
We specialise in expanding your living space to perfectly match your family lifestyle upgrade with our expert home extensions. Our process delivers certainty and a stress free renovation from a trusted builder.
Add new bedrooms and living areas to create the space your family needs to grow.
Build a dedicated home office for a quiet and productive work environment.
Create an open-plan living and alfresco area for modern family entertaining.
Seamlessly blend a new extension with your home’s original character and charm.



This service is not suitable for renters or non-residential properties.
Our 3-Step Home Extension Process in Melbourne
Our streamlined process ensures your house extension is delivered on time and on budget. This is how we manage every home renovation project.
Consultation & Quote
We meet at your home to discuss your goals and assess the site. You then receive a detailed, all inclusive fixed-price quote within 48 hours for total clarity from the start.
Design & Building Approvals
We collaborate to finalize the architectural plans for your approval. Our team then manages the entire council permit process, securing all necessary building approvals on your behalf.
Construction & Handover
Our owner, a registered builder, personally supervises the build to guarantee quality. Upon completion, we conduct a final walkthrough with you and hand over the keys to your new space.
Ready to Plan Your Perfect Home Extension?
You’ve seen our process and our promises. Take the next step towards creating the home your family needs. Your on-site consultation and detailed, fixed price home extension quote are completely free and carry no obligation.
Our Home Extension Portfolio
Browse our gallery of recent work and imagine the possibilities for your own home, backed by our 10-year structural warranty.
Melbourne Home Transformation Case Studies
Beyond the images, here are the stories of the specific problems we solve for our clients.

"We design for your family's real life, not just for the plans. Our focus is on solving your daily frustrations to create a lifestyle matching extension that genuinely improves how you live."
Wafa Ismael, Founder & Licensed Builder
Kew Home Extension for a Growing Family
Problem: A cramped, disconnected living area that made family life feel chaotic.
Solution: A ground floor extension creating a vast, central living hub and open plan kitchen. This design created more space.
Outcome: Completed in 4 months, on budget, delivering a significant family lifestyle upgrade. The renovations were a huge success.
Kew Home Extension for a Growing Family
Problem: A cramped, disconnected living area that made family life feel chaotic.
Solution: A ground floor extension creating a vast, central living hub and open plan kitchen. This design created more space.
Outcome: Completed in 4 months, on budget, delivering a significant family lifestyle upgrade. The renovations were a huge success.
“Mardo Building Co. made it seamless. Our home feels twice as big and functions perfectly for our family now.”
Jane S.
Homeowner
Bentleigh Renovation for a Professional
Problem: No dedicated space for a quiet home office setup to work from home effectively.
Solution: A second storey home addition with a quiet, sun lit home office and master suite. A clever extension design.
Outcome: A perfect work-life balance in a productive work environment without sacrificing valuable garden space.
Bentleigh Renovation for a Professional
Problem: No dedicated space for a quiet home office setup to work from home effectively.
Solution: A second storey home addition with a quiet, sun lit home office and master suite. A clever extension design.
Outcome: A perfect work-life balance in a productive work environment without sacrificing valuable garden space.
“The new office is a game changer for my productivity. The entire process was professional and stress free.”
Mark R.
Homeowner
More Reviews from Melbourne Homeowners
Our guarantees are more than just words. Here is the proof, directly from the homeowners who have experienced our process.
Posted on Praveen YadavTrustindex verifies that the original source of the review is Google. First home is a dream for every person & I’d like to thank Mardo Builders for delivering us a beautiful family space. We could never be happier with the results and the process in time frame. My dealings with Mardo builders were much more professional. I found them very professional, considerate & respectful team of builders , who were happy to fix every nooks & corners of my first house . I’d personally thank Mr. Rafa who took an extra effort to make our new home lively. Rafa & his team had good solutions & was responsive to requests. Most importantly they kept the project within the time frame, ensured we could move into our house on time , which we really appreciate. I would heartily recommend Mardo Builders & his team to anyone thinking about to renovate a house.Posted on Ali SahandiTrustindex verifies that the original source of the review is Google. I highly recommend Mardobuildingco Building Co, his craftmanship is impeccable. Not only was he professional but also punctual and provided us with a very affordable quote and completed the job beautifully and quickly as well. I will be saving Andrew's number as my regular tradie and will be recommending his services to my family and friends! He definitely deserves his client-base.Posted on nilly tahiriTrustindex verifies that the original source of the review is Google. Outdoor renovationPosted on Sara BaTrustindex verifies that the original source of the review is Google. We highly recommend Mardo building , Wafa the builder and his team did a fantastic job to build our granny and house extension , efficient, worth every cent that we spent , will use them againShowing our latest reviews
Your Benchtop, Engineered by Builders
Your home extension is personally supervised by our founder. This direct to builder approach is our promise of quality and your assurance of a stress free process.
You’ve seen the possibilities. The next step is a simple conversation to transform your ideas into a fixed price plan, managed by Melbourne’s expert building team.
Frequently Asked Questions
With a clear understanding of the process, let’s address some final common questions about renovations and home extensions.
What is the typical timeline for an extension?
3-6 months. This is the standard construction timeframe for most home extensions, and your specific timeline will be locked into your HIA building contract for your renovation.
How do I know if my home is suitable for an extension?
We assess this for you. In our initial free consultation, our house extension builders evaluate your property’s structure, land, and council zoning to confirm viability before any work begins on your home.
How is a fixed price contract different from an estimate?
It’s a guarantee. An ‘estimate’ can change. Our fixed-price contract is a legally binding document that locks in the cost, protecting you from budget blowouts during the build.
Who will be my day to day contact on the site?
Our owner. He provides daily site management, so you always have a direct line to the owner-supervised build for ultimate clarity and accountability for your house extension.
What happens if you find unexpected issues like asbestos?
We provide a transparent variation. When it comes to asbestos handling in extensions, safety is key. We stop work and provide a clear project variation document detailing the cost and time to rectify it. We never proceed without your full, informed approval.
What if I want to make a change mid-project?
We document it clearly. If you request a change, we prepare a variation document outlining the cost and timeline impact. We only proceed once you have reviewed and approved it for your home extension.
Start Your Home Transformation with Confidence
We have shown you the clear, guaranteed way to extend your home.
Partner with Mardo Building Co. for a fixed-price contract, a 10-year structural warranty, and a seamless process that delivers the space your family deserves. Let’s build your future, together.