Home Extensions Hornsby

If you’re looking for home extensions Hornsby homeowners trust, you’ve found the right team. Monstructions handles everything from initial design through to final handover, proudly serving Hornsby, Asquith, Waitara and all neighbouring suburbs across the Upper North Shore area.

10+ years experience guarantee

10 years guarantee

100% customer satisfaction

Get A Free Quote Now!

🔥 June Special! Free site inspection + council feasibility check included. Limited to 3 jobs this month. Call 1300 098 730

IS YOUR HOME READY FOR AN EXTENSION?

Monstructions specialises in home extensions Hornsby, expertly designing and building additions that suit the homes and families throughout the Upper North Shore area. We’re proud to serve homeowners throughout Hornsby, Normanhurst and Waitara with our licensed team managing everything from initial design through to final handover.

Fully licensed general contracting

Quality Workmanship

Over a decade of renovation experience across Sydney

Home Extensions Hornsby
Built For The Way You Live

Hornsby has a real mix of housing stock, from original 1960s and 70s brick homes on decent sized blocks to newer townhouses closer to the station. Many of these older homes sit on 600 to 800 square metre blocks with good side access and room to extend. The original floor plans often feel cramped by today’s standards, making an extension a practical way to gain the extra living space families need without leaving the area.

We’ve completed extensions right across Hornsby and neighbouring suburbs like Asquith and Normanhurst, working with the sloping terrain that’s common throughout the Upper North Shore. Our team understands how to design additions that work with the land and the existing home, whether that’s a ground floor extension at the rear or a second storey addition. Every project is managed in house from concept through to completion.

With excellent schools, the train line to the city, and Westfield right there, Hornsby families want to stay put when they outgrow their homes. The local property market is strong, and a well designed extension adds serious value while giving you the space you actually need. It’s almost always more cost effective than selling and buying bigger, especially when you factor in stamp duty and moving costs.

Our Home Extension Services

Whether you need a single room addition or a full second storey, our licensed team delivers quality extensions on time and within budget.

Ground Floor Extensions

Expand your living space with a ground floor addition tailored to your block and lifestyle.

Second Storey Additions

Add a full second storey to your home and double your living space without moving.

Rear & Side Extensions

Maximise your block with a rear or side extension designed to suit your existing home.

DA & CDC Approval Managed

We handle the full council approval process so you don’t have to deal with the paperwork.

Benefits of a Home Extension

Extending your home is one of the best investments you can make as a Sydney homeowner.

Significant Property Value Increase

A well-built extension adds substantial value to your property at resale

Stay in Your Suburb

Extend instead of moving and keep the location, school zone and community you love

More Space for Your Family

Get the extra bedroom, living area or open plan space your family actually needs

Cheaper Than Buying

In most Sydney suburbs, extending costs far less than buying a larger home

Get Started with Monstructions Today!

Ready to extend your home and create the space your family needs? Contact us today for a free quote and let our home extension specialists bring your vision to life.

Our Extension Process

Initial Consultation

Free consultation to discuss your extension ideas, block constraints and budget.

Design and DA Approval

We design your extension and manage the full council approval process on your behalf.

Site Preparation

Full site preparation, structural work and foundation ready for building.

Construction

Licensed builders construct your extension to the highest standard with all trades managed.

Final Handover

Full inspection and walkthrough before handover to ensure everything is built to specification.

How Much Does a Home Extension Cost in Hornsby?

Every extension is different. Click the button below to hear back from us within 2 hours!

Why Hornsby Homeowners Choose Us For Their Extension?

As home extension specialists across Sydney, we manage everything from design and approvals through to construction and handover.

10+ Years of Extension Experience

Our team has delivered ground floor extensions, second storeys and full home additions across Sydney.

We Manage the Full Process

From DA approval to final handover, we handle every step so you don’t have to.

Trusted by Sydney Homeowners

Homeowners across Sydney trust Monstructions to deliver their extension on time and to budget.

Licensed and Fully Insured

Every extension is built by licensed professionals with full insurance and a fixed price contract.

Don't Take Our Word For It

"I contacted Monstructions to get an idea of a price for doing an extension on my home. Of course I contacted many other people but they were the only ones who came back to me and assisted in giving me an idea of the price. I was so grateful. I wouldn't hesitate in recommending this company as we couldn't be more happy with the team, thank you for your help and support."

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Amanda

Turramurra

"We had a plan of what we wanted with our 2nd story + granny flat addition, but also had a budget to meet..the Monstructions team worked hard to make that happen for us. With a few little hiccups along the way from weather delays, the boys kept the job moving as smoothly as possible and the team were amazing in keeping mess to a minimum. Allowing us to stay at home during the reno. 100% highly recommended!"

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Angela

Wahroonga

"Fantastic! Monstructions did an amazing job on my home extension, all the boys that worked on my house were professional and polite, and their quality of work was second to none. From drawings to completion it was a breeze working with them. They were easy to work with and extremely efficient and professional. Thank you for all the hard work and effort, I will recommend you to everyone I know."

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David

Hornsby

Products we use

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FAQS

Got a question?

How much does a home extension cost in Hornsby?

A single room addition typically starts from around $80,000, while a full ground floor extension usually begins from $150,000. Second storey additions generally start from $250,000 depending on size and finishes. We provide a free quote and detailed cost breakdown tailored to your specific home and requirements.

How long does a home extension take in Hornsby?

Most extensions take between 3 to 6 months from council approval through to final handover, depending on the scope of work. The council approval process itself can take 8 to 12 weeks. We’ll give you a realistic timeline during our initial consultation and keep you informed throughout the entire build.

Do I need council approval for a home extension in Hornsby?

Yes, most extensions require either a Development Application or Complying Development Certificate through Hornsby Shire Council. We handle the entire approval process for you, working with our trusted designers and certifiers to get your project approved. Our team knows the local planning requirements and what council typically looks for.

Can you extend on a sloping block in Hornsby?

Absolutely. Sloping blocks are common throughout Hornsby and the Upper North Shore, and we’ve built many extensions on challenging sites. Our designs work with the natural fall of the land, whether that means split levels, undercroft parking or stepped foundations. We assess every site individually to find the best solution.

Do you service Hornsby and surrounding suburbs?

Yes we service Hornsby and all surrounding suburbs. Call 1300 098 730 to discuss your project.

Monstructions provides home extensions across Upper North Shore, including Gordon, Macquarie Park and all surrounding suburbs.