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Home Additions & Extensions · Sydney
Home additions & extensions
Expand your space and enhance your lifestyle. We design and build custom home additions and house extensions across Sydney — managed end to end, from concept to construction.
Expand & Enhance
Create more space without leaving the home you love.
At T3 Interior, we specialise in custom home additions and house extensions in Sydney. Whether you’re adding a new living room, extending your kitchen or building a second storey, we manage the entire process from concept to construction.
Every project is designed to suit your lifestyle, layout and budget, delivering seamless additions that feel like they were always part of your original home.
Why Choose T3
Additions done the right way
01
Tailored Home Additions
Designed to suit your lifestyle, layout and budget, for seamless additions that feel like part of your original home.
02
Experts in Second Storey Builds
From structural planning to finishes, we deliver safe, stylish second storey additions that maximise space and property value.
03
Full-Service Project Management
We manage everything from council approvals to final handover, so you don’t have to lift a finger.
What we offer: types of home additions
We provide a full range of house extensions and second storey additions in Sydney, tailored to suit your property and goals. All additions are custom-designed and managed in-house for seamless results.
- Rear extensions — expand your living room or kitchen into the backyard
- Side extensions — maximise space on narrow lots
- Ground-floor additions — extra bedrooms, bathrooms or offices
- Second storey additions — double your space without sacrificing land
- Outdoor & alfresco areas — stylish entertaining zones
- Garage conversions — turn unused areas into functional rooms
Old Meets New
Design integration & material matching.
We don’t just add space, we make it feel like it was always part of your home. Our team carefully considers structural load, layout flow, lighting and overall symmetry so your extension blends seamlessly with the original build, from rooflines to foundation work.
A great home addition should look and feel consistent inside and out. We source high-quality materials to match your home’s existing finishes, including bricks, flooring, roofing, windows and trim, so old and new come together beautifully.
How We Work
Our home addition process
One accountable team handling planning, approvals, construction and handover, with clear timing and full transparency at every stage.
01
Consultation
We assess your home and goals, then provide a detailed, transparent quote for your addition before any work begins.
02
Design & Approvals
We design the addition and manage the full DA or CDC process, including documentation, submissions and compliance.
03
Build
Structural work, trades and finishes are coordinated in-house, scheduled to reduce disruption to your household.
04
Handover
Final finishes, a full walkthrough and aftercare — we don’t leave until your new space is exactly right.
Good to Know
Home addition FAQs
How long does a typical home addition take in Sydney?
Most home additions in Sydney take 10 to 20 weeks, depending on the scope, approvals and material availability. Ground-floor additions are generally quicker, while second storey additions take longer because of structural and engineering work. Before construction starts, we provide a clear schedule covering design, approvals and build, so you know what to expect at every stage.
What types of house extensions do you offer?
We offer ground-floor additions, second storey additions, rear and side extensions, and alfresco or outdoor living areas, all tailored to your needs and existing structure. Whether you need an extra bedroom, a bigger living space or a whole new level, we design the extension to suit how your family lives and how your home is built.
Do I need council approval for a house extension in Sydney?
Yes, most house extensions in Sydney require DA or CDC approval. We handle the entire process for you, including documentation, drawings, submissions and compliance with council requirements. Our team liaises with certifiers and authorities so approvals progress smoothly, keeping your second storey addition or ground-floor extension on track without the paperwork becoming your responsibility.
Can you build a second storey addition on any home?
Not every home is immediately suitable, but our team assesses your existing structure and foundations and advises on feasibility before any commitment. Where a second storey addition is viable, we manage the engineering and design to ensure it is safe and stylish. Where it is not, we suggest alternatives such as ground-floor or rear extensions.
Will the new extension match the existing style of my home?
Absolutely. We carefully match materials, rooflines, finishes and layout so your home addition looks cohesive and timeless rather than bolted on. Whether your home is heritage, contemporary or somewhere in between, our designers blend the new and existing spaces seamlessly, and our in-house joinery ties the interiors together with consistent detailing throughout.
Can I live in my home during the extension work?
In many cases, yes. We schedule the works to reduce disruption and keep the site contained and safe. For larger projects such as second storey additions, we discuss the best approach with you in advance, including which stages may affect access, so you can plan around the build and decide what works best for your household.
How much does a house extension cost in Sydney?
Costs vary with size, design and material choices, so we provide a detailed, transparent quote for every house extension project in Sydney after assessing your home and goals. The quote is itemised with no hidden costs, and we are happy to discuss where you can invest or save, helping you plan an extension that suits your budget.
Do you manage the entire project, including trades and timelines?
Yes. As full-service home renovation builders in Sydney, we oversee everything from planning and approvals to construction, trades and handover, all coordinated in-house. You deal with one accountable team rather than juggling separate contractors, which keeps your home addition on schedule, on budget and built to a consistent standard from start to finish.
Renovation Guides
Related reading for your home addition
Start the Conversation
Request a quote for your extension
Tell us about your home addition or extension project in Sydney or across NSW. We’ll arrange an appointment, talk through your ideas, and map the next step for your home.