Custom Homes, Extensions & Renovations in Melbourne

20 Years of Crafting Melbourne’s Signature Homes.

OUR SERVICE

As certified boutique residential builders, we partner with architects and clients across metro Melbourne to deliver high-end custom renovations, extensions and new builds.

“Greg made what can be a stressful experience into a smooth one. ”

— This is what we aim for, every time.

Quality Custom Homes. Exceptional Client Service.

With a focus on innovative building techniques and a talent for complex builds, we’ll work tirelessly to deliver every aspect of your project to the highest quality—on budget and on time.

We’ve earned our reputation as home renovation builders in Melbourne who prioritise the client journey just as much as the final build. By maintaining an open, friendly, and transparent process, we turn the complexities of construction into a seamless experience.

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**Melbourne Home Extensions & Renovations Built Around You**

We’re your trusted builder in Melbourne’s Inner South East (Malvern, Malvern East, Glen Iris) and Middle South East (Camberwell, Bentleigh).

For those living in a heritage-rich suburb, we specialise in luxury home extensions that honour the character and history of period residences.

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Let’s build your dream home together.

Whether you are reimagining your current space or building from the ground up, our team combines innovative design with master craftsmanship. As a custom builder, we specialise in creating homes that don’t just look exceptional but also work perfectly for the way you live.

Home Extensions

Home Renovations

Custom Home Builds

OUR SERVICES

Heritage Home Extensions

Architectural Second-Floor Extensions

Double-Storey Extensions

Preserving Character, Enhancing Luxury

Planning a heritage home extension in Melbourne? We deliver elegant, high-quality results for Melbourne’s finest homes. Our expertise ensures that every new addition seamlessly honours the original soul of your residence.

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Designed for the Modern Family

For growing families, we specialise in contemporary home extensions and renovations designed to elevate their lifestyle:

Open-plan living house extensions

Intelligent floor planning to suit families

Indoor-outdoor living home renovations

As professional renovation builders in Melbourne, we assist you in transforming your home without the hassle of relocating.

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A Boutique Building Experience

Why Choose GMAC Built?

We are a company that values quality over quantity. No matter how big or small the project, from a small home renovation to a luxury home construction, we deliver quality in every project we take on.

Built on Trust, Experience, & Craftsmanship

Our Credentials:

Trade certified as a carpenter

Registered domestic builder (unlimited)

Victorian Building Authority certified

Member of Master Builders Victoria

Over 20 years of experience

Built and managed projects exceeding $1M

Working with GMAC Built means gaining unparalleled access to your builder, Greg, who is regularly on-site to ensure every detail is executed to the highest standard. You can expect honest, transparent communication at every stage, along with a collaborative approach that works seamlessly with your architect or designer.

GMAC Built offers the flexibility needed to manage complex build projects, while maintaining a strong commitment to reliability—consistently meeting and often exceeding project deadlines.

Meet Your Builder – Greg McCaskill

With over 20 years of experience, Greg leads every project with a hands-on approach. Known for being approachable, detail-oriented and solutions-focused, he ensures every build meets the highest standards.

You’ll work directly with Greg throughout your project—so nothing gets lost in translation.

BUILD YOUR DREAM HOME

Railway Road - Carnegie

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Warley Road - Malvern East

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Patterson Street - Middle Park

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Lawson Parade - Highett

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Wheeler Street - Pascoe Vale

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A Proven Process for Stress-Free Building

Get in touch with us for an initial chat about your project—either before you’ve chosen a building designer or when you have endorsed plans from your architect. If you haven’t already chosen your architect, we’re happy to recommend one of our trusted partners.

Initial Chat

We develop a custom proposal and walk through it with you to align on every detail.

Collaborate Openly

Once you’re happy with everything in your project proposal, both parties will sign our contract. We manage all contracts and permits for official approval while maintaining transparency throughout the build phase with regular site meetings and progress updates.

Deliver with Confidence

We’ll start your build at the agreed time, with fortnightly site meetings initially to track progress, answer your questions and discuss solutions for any issues. Once the build is well underway, our site meetings will be every three to four weeks, depending on your project scope and the finishing in progress.

Build and Project Meetings

We’ll invite you to the final site meeting and build sign-off, with a handover package for all appliances and certificates of compliance. Now, you can move into your beautiful new or refurbished home!

Project Sign-off

DISCUSS YOUR PROJECT

Trusted by Melbourne Homeowners

Sam

Engaging GMAC Built for our dual townhouse project was a great decision. Without an architect, we relied heavily on his experience and guidance. He helped us make smart choices that not only look great but added real value to the investment. This was no easy build, coming right in the middle of Covid. With restrictions, shortages, and constant uncertainty, Greg's project management and resilience really stood out. He kept things moving, found solutions, and always kept us informed. These two beautifully finished townhouses have proven to be an excellent investment and we are thankful to GMAC Built. Greg was flexible, friendly, and genuinely easy to work with. We'd absolutely build with him again.
Travis

Having worked with GMAC Built over the last ten years, I had seen Greg's dedication to each job and also knew he had the expertise needed for a dual townhouse project. And as expected, we had a great experience with GMAC Built. From the start, Greg took the time to understand our goals and was upfront about what could be achieved within our budget. As the project went along, we made a few changes on the fly and Greg took it in his stride and worked with us to find practical solutions that kept the design on track and the costs under control. His flexibile and transparent approach made the whole process so much less stressful. We always felt like we were in good hands and were being prioritised. We were constantly amazed at how quickly the project progressed. It was clear that Greg and the team cared about every detail. The end result was a flawless build without blowing the budget. We'd happily recommend GMAC Built to anyone.

We spend our time transforming other people's homes (and we love it), but now it's time to tackle our own.
This 1940s beauty hasn't been touched in decades and we're about to change that. We'll be documenting it all from day one: the decisions, the m

Why GMAC Built? Because we want you to finish your project feeling like it was a “complete success.”

It’s a privilege to bring someone’s home to life, and we don’t take that lightly.

That’s why at GMAC Built, we

A refined little workhorse.
A modern laundry refresh that proves small spaces can still feel great. Crisp finishes and simple detailing keep it clean, modern, and quietly functional.

Design: @westvalentine_design
Photography: @timturnerphotographer

From boxed-in to beautifully free.

This kitchen transformation brings warmth, light, and flow back to the heart of the home. Rich timber tones, sleek stone, and thoughtful detailing combine to create a sophisticated yet effortless space that feels

A sophisticated contemporary update.

📍Malvern

This Malvern renovation traded in tired charm for bold modern lines. The black-clad extension with expansive glass completely redefines how this home connects to its garden creating seamless indoor&nd

Why GMAC Built? Because communication makes all the difference.

When you’re kept in the loop with clear, consistent, and transparent updates, the stress of renovating fades and the process feels smooth.

At GMAC Built, you’ll never be ch

🏡🏡 Double the Opportunity – Two homes, one seamless build

Thinking about building two homes on one block? Whether it’s for investment, extended family, or to sell one and live in the other, subdivisions are a great way to maxmimise you

💻 Productivity looks good here.

A study nook that proves you don’t need a whole room to work in style. Natural light, clean lines, and a leafy outlook will have you looking forward to working from home.

#StudyNook
#HomeOfficeGoals
#Design

✨ Light. Bright. Beautiful.

📍 Carnegie – Dual Occupancy

Designed to elevate your everyday, this kitchen’s mix of soft timber, crisp white detailing and luxe stone brings a sense of calm and sophistication.

#LightFilledLiving
#Natura

Why GMAC Built? Because we’ll get you in your new home sooner.

We believe you deserve to be living, relaxing, and making memories in your new home. That’s why at GMAC Built, we don’t spread ourselves thin. Fewer projects mean mo

Serene. Soft. Effortless.

A master bedroom that feels like a breath out.

Light-filled, beautifully balanced, and ready for slow mornings.

#BedroomGoals
#InteriorInspo
#ModernLiving
#NaturalTones
#DualOccupancy
#DualOccupancyMelbourne
#DualOc

🛁 Spa vibes, every day.

This bathroom is designed for calm. With clean lines, soft light, and all the practical details that make a space feel indulgent without trying too hard.

#BathroomGoals
#SpaInspired
#ModernDesign
#LuxuryInTheDetails
#F

A Home Reimagined

📍Middle Park Project

What do you do with a poorly built, outdated home in a prime location? Reimagine it.

We teamed up with the architect, Leon Moulton Architecture and Interiors, to transform this early ‘90s property a

Why GMAC Built? Because your timeline matters.

We know that delays can be frustrating, costly, and stressful. That’s why GMAC Built is doing things differently.

We don’t treat the schedule as a “nice to have.” We plan care

When function meets form.

This carefully crafted staircase provides an impact that turns everyday movement into a design moment.

#StairwayAsArt
#ArchitecturalDetails
#GMACBuilt
#DesignMatters
#CustomCraftsmanship
#GMACBuilt
#GregMcCaskill
#M

Ready to Start Your Home Extension or Custom Build?

Whether you are looking for a premier custom builder or one of the leading renovation companies in Melbourne, GMAC Built has the expertise and seamless approach to bring your vision to life.

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