Pricing • Service Areas • Reviews • Process
Looking for home extensions in Sydney that feel like they’ve always belonged? Montclair Build Co designs and builds tailored additions that increase space, improve flow, and add long-term value—without compromising the character of your home.
From ground floor home extensions (rear extensions, kitchen/living expansions and new rooms) to second storey additions in Sydney, we manage the full process: planning, approvals support, construction, and finishing—so your project stays clear, controlled, and high-quality from start to handover.
Your extension should be built properly, documented properly, and managed properly. We keep the process clear from planning through to handover, with practical guidance and consistent updates.
Licensed builder – NSW Licence: 300345c
ABN – 84606074980
Insurance & warranty – We hold public liability insurance and provide warranties in line with NSW requirements. Where required for eligible projects, we can also guide you on the correct insurance pathway.
Project management – Your job is overseen by our licensed builder with scheduled trades and quality checks.
Communication cadence – You’ll get regular progress updates and clear milestones, so you always know what’s next.
Proof of work – View our recent projects and read client feedback on our Reviews page.
Expand your living space efficiently while maintaining design harmony.
Add extra rooms to improve your home’s functionality and comfort.
Transform underutilized areas into useful, practical spaces.
Expert guidance and layouts to ensure your extension meets your exact needs.
A well-planned house extension in Sydney should improve how your home works day-to-day—more natural light, better connection to outdoor areas, and layouts that suit growing families. We focus on structural integrity, seamless integration with your existing rooflines/materials, and practical details that make the new space feel original.
If you need more bedrooms or a parents’ retreat but want to keep your backyard, a second storey addition in Sydney can be the ideal solution. We assess structure, engineering requirements, stair placement, and buildability early so the design is comfortable, compliant, and cost-aware before construction begins.
At Montclair Build Co, we understand that adding space to your home is a big step. Whether it’s a new bedroom, living area, or an elegant extension, we make the process seamless and stress-free, ensuring your home grows beautifully with your lifestyle.
Customized planning and design – We work with you to create extensions that complement your existing home, optimizing space, light, and flow.
Clear timelines and budgets – From initial concept to completion, we provide transparent plans so you know what to expect every step of the way.
Expert construction and finishing – Our skilled team uses premium materials and precise techniques to ensure your addition is built to last and looks like a natural part of your home.
Support beyond completion – We don’t just finish the project and walk away; we provide guidance and maintenance tips to keep your new space functional and beautiful for years to come.
When people ask about home extension cost in Sydney, the honest answer is that it depends on your scope, site conditions, and level of finish. We provide clear, itemised guidance so you understand what you’re paying for before work begins.
Scope & layout changes – opening up living areas, new rooms, reconfigurations and structural work.
Foundations & structure – footings, steelwork, framing and engineering requirements.
Wet areas – bathrooms/laundries add waterproofing, drainage, tiling and fixtures.
Site access & conditions – access, slope, excavation and existing services impact costs.
Approvals & compliance – DA/CDC pathway, documentation, and certification.
Finishes – windows/doors, flooring, cabinetry and detailing change the final budget.
For a tailored estimate, call 0404 467 516 or request a quote.
We build home extensions in Sydney across Greater Sydney and surrounding suburbs. If you’re unsure whether we cover your area, call 0404 467 516.
Eastern Suburbs – Rear extensions, renovations and high-quality finishes
North Shore – House extensions and second storey additions
Inner West – Character home extensions with careful planning
Northern Beaches – Coastal-friendly upgrades and thoughtful layouts
Sutherland Shire – Extensions, additions and full-home upgrades
Western Sydney – Design & build extensions with clear scope
We’re proud of the results we deliver through our home extensions in Sydney. You can read more on our Reviews page.
“Clear scope and great workmanship”
“The team communicated well, managed trades professionally, and the extension feels like part of the original home.”
— Sydney homeowner
“Second storey done properly”
“We added bedrooms upstairs and kept the backyard. The process was structured and the finish was excellent.”
— Sydney homeowner
1) Consultation & goals – We confirm your needs, timeline and budget range.
2) Site visit & feasibility – We assess access, structure, services and buildability.
3) Design coordination – Layout, look and scope aligned before pricing and approvals.
4) Transparent estimate – Clear inclusions, realistic allowances, no vague line items.
5) Approvals – Guidance on DA/CDC pathway and compliance requirements.
6) Build & project management – Scheduled trades, quality checks, consistent updates.
7) Handover & aftercare – Final walkthrough and support after completion.
A home addition involves building a new space, such as an extra room or second story, while a home extension expands your existing layout—like extending a living room, kitchen, or outdoor area. Both increase space and add value to your property.
Yes, most home additions and extensions require council approval or permits. Our team handles all approvals to ensure your project meets local building regulations and runs smoothly.
The timeline depends on the size and complexity of the project. Smaller extensions may take a few weeks, while larger home additions can take several months. We provide a detailed schedule so you know what to expect.
Absolutely. From open-plan living areas to extra bedrooms, we design home additions and extensions to suit your lifestyle, budget, and property style—using premium materials and expert craftsmanship.
