Home extensions are the smart alternative to moving. Whether you need more living space, a better kitchen, or an extra bedroom, a well-designed extension adds genuine value to your property while you stay in the neighbourhood you love.
At Haiku Building, extensions aren’t just what we do — they’re what we’ve built our reputation on. Since our early projects in Marrickville and Newtown, we’ve completed dozens of extensions across Sydney’s Inner West, Eastern Suburbs, and the Illawarra. We work to a fixed-price contract model, so you know exactly what you’re paying before we break ground. No surprises. No scope creep.
Our approach is anchored in sustainable building practices. As Passive House Association members, and registered with the MBA, SBA, and HIA, we bring both expertise and accountability to every project. Todd, our director, is hands-on — literally on site during construction — which means the quality in our early designs is the quality you get at completion.
Types of Extensions We Build
Rear Extensions
Rear extensions are the most popular extension type in Sydney, and for good reason. They capture northern light, open living areas into the garden, and can completely transform how you use the home. In suburbs like Bondi, Randwick, and Coogee, we’ve extended rear boundaries to create seamless indoor-outdoor living spaces. Whether you’re adding a new kitchen-dining area or a family room, rear extensions work well on most block shapes and typically face fewer council hurdles than other extension types.
Ground Floor Extensions
Ground floor extensions work brilliantly when you want to expand without going up. In terrace-heavy areas like Balmain and Leichhardt, ground-floor additions preserve neighbourhood character while giving you the space you need. They’re ideal for creating new bedrooms, studies, or wet areas. The advantage is simplicity — fewer structural complexities than upper-level work, and they integrate naturally with existing homes.
First Floor Additions
First floor additions maximise your site’s potential and deliver the biggest value uplift. They’re popular in the Eastern Suburbs and Inner West suburbs like Hurlstone Park and Dulwich Hill, where land is tight and planning rules allow. These require more engineering and council navigation, but the space gain is substantial. We’ve completed successful first floor additions on properties with challenging orientations and heritage considerations.
Side Extensions
Side extensions are sometimes the solution when front and rear space is constrained. They work particularly well on corner blocks or where you’re adding a garage, carport, or additional bedroom. In Paddington and surrounding areas, side extensions must be handled carefully to respect streetscape character, but they’re absolutely achievable.
Sustainable Extensions as Standard
Every Haiku Building extension is designed and built to sustainable principles. We don’t charge premium rates for “going green” — it’s simply how we work.
That means thermal mass and natural ventilation built into the design, high-performance glazing and insulation, energy-efficient systems selected from the start, responsible material choices, and water efficiency in kitchens and bathrooms.
As Passive House Association members, we understand envelope performance, thermal bridging, and airtightness. Even if your extension doesn’t pursue formal Passive House certification, those principles deliver better comfort, lower running costs, and genuine long-term value. Properties in suburbs like Newtown and Marrickville, where sustainability-conscious buyers are concentrated, benefit significantly from this approach.
For a deeper dive into our sustainability credentials, see our sustainable building services.
Our PAC Process — Clarity From the Start
We use a PAC Process — Paid as Consultant — for all pre-construction phases. Before committing to a fixed-price contract, we charge a daily rate to investigate your site thoroughly, develop detailed designs, and secure council approval. This separates good intentions from real feasibility.
The PAC phase includes site analysis and constraint mapping, concept design development with your input, council application preparation and liaison, heritage overlay assessment (critical in Inner West and Eastern Suburbs), structural and services coordination, and fixed-price contract preparation.
Once council approves and you’re confident in the design, we transition to the fixed-price build phase. You know the cost, the timeline, and exactly what you’re getting. The approach has prevented countless surprises on our projects in Bondi, Randwick, and Coogee.
Council Approval and Heritage Overlays
Sydney’s inner suburbs — particularly Marrickville, Dulwich Hill, Balmain, and Leichhardt — have heritage overlays that require additional assessment. The Eastern Suburbs also include heritage considerations in pockets like Paddington. It’s not a barrier; it’s simply a detail that needs proper handling.
We’ve successfully navigated heritage assessments on dozens of extensions. The key is early engagement with council and heritage advisors, good design that respects character, and clear documentation. What sometimes looks like a “no” in council’s eyes becomes a “yes” once the design intent is properly explained.
Living in Your Home During Construction
Most people ask: can we stay while building? The answer is usually yes, though it requires planning. Ground floor extensions generally allow families to remain upstairs and relatively unaffected. First floor additions are more disruptive — noise, vibration, and restricted access all come into play.
We minimise disruption through clear site boundaries and workspace management, scheduled work phases, dust and noise management protocols, and regular communication about milestones and impacts.
Ready to Extend?
Your next step is a conversation. We’ll discuss your space needs, budget, and timeline. If your project suits our approach and service area, we’ll outline the PAC phase cost and process. If it doesn’t, we’ll tell you honestly and suggest alternatives.
Get in touch. Let’s talk about adding the space that fits your life.
Explore Our Other Services
Extensions are just one part of what we do. We also handle full home renovations, sustainable and Passive House builds, and architectural projects in collaboration with your designer. Browse all our building services.