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Additions And Extensions

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We create additions that look like they’ve always belonged to your home. Extra space and comfort without leaving the location you love.
The ZJ Building team members.
[Additions that feel amazing to live in]
Our multi-award-winning team will transform and expand your home, giving you the extra living space you’ve been dreaming about. Whether it’s an open-plan extension perfect for entertaining, more bedrooms for your growing family, or the kitchen and butler’s pantry you’ve always wanted, every addition is meticulously designed and constructed so it looks like it’s always belonged, seamlessly blending modern functionality with your home’s existing character on time and within budget.

“We now have a period home with a modern addition at the back that has all the functionality we wanted…” - Doug from Prospect
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[Your addition vision]

Create the extra living space and comfort your family needs

Like most people thinking about extending their home, you’ve probably been dreaming about what you want. Every addition we create gives you the space you need while seamlessly integrating with your existing home, transforming how you live without compromising on style or character.

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Room to live the way you want with spacious open-plan living that flows seamlessly to outdoor entertaining areas, perfect for relaxing as a family or hosting friends.
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Your dream kitchen at last, with plenty of bench space, a butler’s pantry and room for everyone to gather while you’re cooking and entertaining.
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Space and privacy for everyone with thoughtfully designed bedrooms and bathrooms, so everyone has room to relax in privacy while staying connected as a family.
The ZJ Building team members.
[Common concerns we help solve]
Worried your extension will look tacked on
You want seamless integration, not an obvious addition. We specialise in making new additions blend perfectly with your existing home, creating extensions that look like they’ve always belonged.
Dealing with potential health issues
Your home should support your health, not compromise it. We can assess for issues like mould in walls and ensure your extension creates a healthier living environment for your family.
Concerned about costs spiralling out of control
You want certainty, not surprises. We provide genuine fixed pricing based on detailed planning, so you can confidently budget without fear of unexpected costs once work begins.
Anxious about council approval and compliance
Planning permission shouldn’t be stressful. We’re experienced with local requirements and guide you through the approval process smoothly, handling all the compliance details for you.
[Our Approach]

An addition that gives you the home you’ve always wanted

Unlike most builders who only do extension projects until they can break into the new home market, we’ve spent the past 10 years specialising in thoughtfully designed additions that transform Adelaide homes. With more than 100 successful projects completed and multiple HIA awards, our proven process ensures your extension gives you the extra space and comfort you need while looking like it was always meant to be there.

Extension design expertise
Open Accordion

We love the challenge of creating seamless additions to character homes, ensuring your extension flows naturally from existing rooms while adding modern comfort and convenience.

Character homes without the council headaches
Open Accordion

We've helped dozens of Adelaide homeowners extend within tight heritage overlays, preserving charm while upgrading comfort and functionality with smooth council approval guidance.

Your own project manager
Open Accordion

We limit each project manager to just 5 projects at a time, ensuring you get the focused attention you deserve with immediate answers to any questions.

Fixed price guarantee
Open Accordion

We thoroughly assess your site and provide a comprehensive fixed-price quote based on detailed planning, eliminating fear of unexpected costs or variations.

In-house carpentry team
Open Accordion

When challenges arise with extensions, our dedicated carpentry team solves them immediately, from matching original features to ensuring perfect transitions between old and new.

A building experience you actually enjoy
Open Accordion

Extending should be an exciting journey to your dream home, not months of stress. We provide confidence through careful planning, daily updates and respectful treatment of your existing home.

Daily progress updates
Open Accordion

Through your personal online portal, you'll see daily photos and progress reports, watching your perfectly integrated addition take shape day by day with complete transparency.

Quality control systems
Open Accordion

Our detailed quality assurance process ensures superior workmanship throughout, completing every aspect of your extension to the highest standard for seamless integration you'll be proud of.

Family business values
Open Accordion

As a family business who've extended our own home, we understand what's at stake and plan carefully to minimise disruption while treating your home with the same care we would our own.

Book your free design consultation
[The PathWay]

Your clear path to the perfect home extension

Taking on a major extension can feel overwhelming when you’ve heard stories about additions that look out of place, council approval nightmares, and projects that disrupt family life for months longer than promised. That’s why we’ve developed a streamlined, systems-led approach that brings certainty and peace of mind to even the most complex additions.

Step 1: Your Design Consultation
Open Accordion

Whether you're dreaming of a spacious open-plan extension for entertaining, extra bedrooms for your growing family, or the dream kitchen you've always wanted, we'll explore all possibilities together. We'll create a detailed plan that maximises your home's potential, handle all council requirements, and provide a fixed-price proposal so you know exactly what to expect.

Step 2: Careful, Considerate Construction
Open Accordion

Experience the confidence of having master craftsmen create your extension with respect for your existing home. Your dedicated project manager (handling just 5 projects at a time) keeps you updated daily through your online portal, while our in-house carpentry team ensures every detail is executed flawlessly, from matching original features to creating perfect transitions. Your extension progresses smoothly and efficiently, finishing on time and within budget.

Step 3: Your Transformed Home
Open Accordion

Welcome to your beautifully expanded home, where old and new blend seamlessly together, giving you all the extra space and comfort you need without compromising your home's character. As Doug from Prospect discovered: "We now have a period home with a modern addition at the back that has all the functionality we wanted. I ended up with good access to my cellar through a very large butler's pantry and Heather has her dream kitchen."

Our full process
The ZJ Building team members.
The ZJ Building team members.
[Our iron-clad Guarantees]

Six ways we protect your investment

Sadly, many builders shy away from making guarantees. But we’re proud to stand behind our work. And offer ongoing support to our wonderful clients. Here are six ways you can be sure you’ll get exactly what you want, delivered exactly how we promise.

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1.
Fixed price promise
Your price is fixed and final, based on detailed planning not rough estimates. This means you can confidently plan your budget without fear of unexpected costs or variations.
2.
Communication guarantee
You’ll receive daily updates through your online portal and responses to any questions within 2 business days. No more wondering what’s happening with your renovation or chasing builders for answers.
3.
Quality craftsmanship
Only licensed, professional trades who meet our strict standards work on your home. Plus, our in-house carpentry team ensures superior workmanship at every stage, giving you a custom home that stands the test of time.
4.
Professional development commitment
We constantly refine our processes and stay updated with the latest building innovations. This means your custom home benefits from current best practices in both design and construction.
5.
Ongoing support promise
Our relationship doesn’t end at handover. We stay in touch to ensure you’re completely satisfied, including a 3-month follow-up to address any settling issues. Your home’s long-term performance matters to us.
6.
10-year structural warranty
Complete peace of mind with our decade-long structural warranty. We build for lasting quality, not just immediate satisfaction.
[Ready to start planning?]

Free advice for building an extension you’ll absolutely love

Like most Adelaide homeowners who contact us about extensions, you probably have exciting ideas about creating the dream home you’ve always wanted. Our free design consultation helps you explore what’s possible and develop a clear plan to bring your vision to life.

During our consultation we’ll…

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Assess your site’s potential and explore possibilities
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Explain how we ensure seamless blending
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Identify layout options working best for lifestyle
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Share relevant examples from similar completed extensions
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Discuss council requirements, budgets and project timelines
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Answer questions about minimising disruption to family

This is your chance to tap into our decades of extension expertise and avoid costly mistakes while ensuring your extension gives you exactly the extra space you’re dreaming of.

Book your free design consultation
The ZJ Building team members.
The ZJ Building team members.
[Your Free Guide]

Download our complete renovation planning & design guide

When you’re investing in your forever home, choosing the right builder matters more than anything else. Download our practical guide to avoid costly mistakes and find a builder you can trust.

Download
[Frequently Asked Questions]
How do I know if my home is suitable for an extension?
Open Accordion

Most Adelaide homes have excellent potential for extension – it's just about finding the right approach. During your Design Consultation, we'll assess your site (not just your plans), explore possibilities for better flow and functionality, and help you understand what's possible. We'll also identify any potential challenges early, so there are no surprises later.

What's involved in getting council approval?
Open Accordion

No need to worry about all the paperwork – we’ll handle the entire council approval process for you. Having completed hundreds of extensions across Adelaide, we know exactly what's required for each council area. We'll prepare all documentation, manage submissions, and guide your application through to approval, saving you time and stress.

How long does an extension typically take?
Open Accordion

While every project is different, we provide a detailed schedule before work begins and stick to it. Your dedicated project manager ensures everything stays on track, and you'll see daily progress through your online portal. As Michelle from Norwood shared: "We had peace of mind knowing exactly what was happening and when."

How will you make sure the extension matches my existing home?
Open Accordion

This is one of our specialties. From matching bricks and architectural features to ensuring consistent flow throughout your home, we go to great lengths to create extensions that look like they were always there. Just ask Greg and Lynne from Glenunga, who told us: "Zak did an extraordinary job integrating all those special features so beautifully."

Can we live in our home during construction?
Open Accordion

Yes, we carefully plan your extension to minimise disruption to your family life. We'll create clear separation between construction areas and living spaces, maintain essential facilities throughout, and coordinate noisy work around your schedule where possible.

What about protecting my existing home during construction?
Open Accordion

We treat your home with absolute care during construction. Our team uses comprehensive protection measures for your floors, walls, and furniture. Plus, our in-house carpentry team ensures any connections between old and new are handled with precision.

How do I know my extension won't blow out in cost?
Open Accordion

Unlike builders who provide rough estimates, we give you a genuine fixed price based on detailed planning and real trade quotes. This means you know exactly what your extension will cost before work begins – no surprises, no variations, no stress.

Will an extension add value to my home?
Open Accordion

A well-designed extension not only creates more living space but typically adds significant value to your property. We help you make choices that maximise both lifestyle benefits and potential return on investment. As Doug from Prospect discovered: "We now have a period home with a modern addition that has all the functionality we wanted."