Home Extensions on the Mornington Peninsula
Living on the beautiful Mornington Peninsula and need more space? At Just Building Group, we specialise in home extensions that bring your vision to life!
home Extension specialists
More Space, Built Around You
Extending your home is one of the smartest investments you can make – and at Just Building Group we make the process straightforward, transparent and enjoyable from start to finish.
Whether you’re dreaming of a second storey addition, a ground floor extension, a new master suite or an open plan living area that finally gives your family room to breathe – we manage every stage for you. From initial design and council approvals through to the final coat of paint, Just Building Group handles everything so you don’t have to.
The home you’ve outgrown is about to feel brand new.
Just Building Group
Mornington Peninsula Home Extension Specialists
For over 30 years we have been designing and building home extensions across the Mornington Peninsula – each one seamlessly integrated into the existing home.
As a long-standing, trusted builder on the Peninsula, we’ve helped countless families transform their homes into stunning, functional spaces.
Whether you’re after a second storey, a larger living area, or a brand-new outdoor living space, our expert team will guide you through every step of the process.
Extending your home should be an exciting experience – not a stressful one. At Just Building Group we act not just as your builder but as your trusted advisor throughout the entire process. From your first conversation with Justin and Nicky through to the day we hand over your newly extended home, we’re with you every step of the way.
More space. More value. Less stress.
what we build
Home Extensions We Specialise In
Single Storey Extensions
Extend your home at ground level – extra bedrooms, living areas or a larger kitchen footprint.
Second Storey Additions
Add a full second storey to your existing home – double your living space without losing your block.
Rear Extensions
Open up the back of your home with a seamless rear extension connecting to your outdoor living area.
Side Extensions
Maximise your block with a side extension – ideal for narrow blocks across the Mornington Peninsula.
Garage Conversions
Transform your existing garage into a functional living space – home office, bedroom or studio.
Dual Living Extensions
Create a self-contained living space for family members or rental income – fully managed from design to handover.
Alfresco & Outdoor Extensions
Extend your living space outdoors with a covered alfresco area, deck or outdoor entertaining space.
Granny Flat Additions
Add a self-contained granny flat to your property — perfect for extended family or investment income.
getting started is easy
get started in 3 simple steps
New to Home Extensions? Here’s all you need to do.
1.
Give Us a Call
Pick up the phone or fill in our contact form. No technical knowledge required – just your ideas and your dream.
2.
Book Your Free Consultation
We come to you. Justin and Nicky will visit your site, listen to your vision and answer every question – completely free.
3.
We Handle Everything
Once you’re ready to proceed we take care of every single detail from design through to the day we hand over your keys.
Ready To Extend Your Home on the Mornington Peninsula?
No obligation, no pressure – just honest advice from a local extension builder who knows the Peninsula.
from first meeting to final handover
The Home Extension process
Everything Managed For Your Home Extension
Here’s everything we take off your plate with Just Building Group.
Initial Design Consultation
We discuss your extension vision, assess your existing home and help you understand what’s possible – completely free and no obligation.
Architectural Plans & Drawings
We manage all architectural plans and drawings for your extension, ensuring your design integrates seamlessly with your existing home.
Planning Permits & Council Approvals
We handle every permit and council approval required for your extension on the Mornington Peninsula – no paperwork, no stress.
Site Preparation & Construction
From the first wall opened to the final fixture installed – Justin personally oversees every stage of your extension build.
Trades Coordinated & Managed
We manage every trade on your behalf – no juggling multiple contractors. One point of contact throughout your entire extension.
Final Handover & Inspection
We complete a thorough final inspection and hand over your beautifully extended home – on time, on budget and built to last.
Why Families choose us
A Home Extension Builder Who Knows the Mornington Peninsula
We’re not a volume builder bolting on generic extensions. Every Just Building Group extension is designed to integrate seamlessly with your existing home – matching materials, rooflines and character so the extension feels like it was always part of the original design.
No two extensions are the same – and that’s why we are the experts
Full Project Management
Licensed & Registered Builder in Victoria
30 Years of Building Experience
Local Peninsula Knowledge
Transparent Fixed Price Contracts
Our Recent projects
Home Extensions Across the Mornington Peninsula and Victoria
A selection of home extension projects completed by Just Building Group across the Mornington Peninsula and Victoria.
1960s Timber Cottage Renovation
Full Home Renovation in Mt Martha
Airbnb Renovation – Mornington Peninsula
what our customers are saying
Trusted by Homeowners Across the Mornington Peninsula
Common questions?
Home Extension FAQs
Everything you need to know about your home extension on the Mornington Peninsula.
Most home extensions take between 3 and 6 months from design through to final handover, depending on the size and complexity of the project. A single room addition typically takes 8-12 weeks while a full second storey addition can take 4-6 months. We provide a detailed timeline at the start of every project.
Extension costs vary depending on size, type and complexity. A single room addition typically starts from $80,000, while a full second storey addition starts from $250,000. We provide transparent, fixed price quotes after your free site consultation so you know exactly what your extension will cost before any work begins.
Most home extensions on the Mornington Peninsula require either a building permit or planning permit depending on the size and location of the extension. Just Building Group manages every permit and approval on your behalf – you don’t need to deal with council paperwork yourself.
Absolutely – seamless integration is one of our specialties. We carefully match materials, rooflines, cladding and architectural details so your extension feels like it was always part of the original home. We have extensive experience matching both modern and heritage Peninsula properties.
Yes – second storey additions are one of our most popular extension services on the Mornington Peninsula. We assess your existing structure, manage all engineering requirements and council approvals, and build a second storey that integrates seamlessly with your existing home.
Yes – dual living extensions and granny flats are increasingly popular on the Mornington Peninsula for extended families and investment income. We design and build fully self-contained living spaces that comply with all local council requirements.
We build home extensions across the entire Mornington Peninsula including Mornington, Mount Eliza, Mount Martha, Frankston, Baxter, Somerville, Tyabb, Hastings, Rosebud, Rye, Blairgowrie, Sorrento and Portsea.
where we build extensions
Home Extension Areas We Service Across the Mornington Peninsula
Just Building Group are based on the Mornington Peninsula and build across the entire region. From Frankston and Mount Eliza in the north, down through Mornington, Rosebud and Rye, to Sorrento and Portsea at the tip – if you’re on the Peninsula, we build there.
Ready To Extend Your Home on the Mornington Peninsula?
Just Building Group are Mornington Peninsula’s trusted home extension builders – managing every stage from initial design and planning permits through to final handover. Book your free one hour site consultation today.