Reimagine what your home can be

First-floor additions in Sydney typically range from $250,000 to $450,000+, depending on size, complexity, and finishes. Structural engineering, scaffolding, and temporary weatherproofing add costs you won't see in a ground-floor renovation. We provide detailed, line-item quotes so you can see exactly where the money goes. Read our home extensions guide for more on what to expect.

Yes. Most home extensions in Sydney require approval via either a DA (Development Application) or CDC (Complying Development Certificate). A CDC is faster (1 to 4 weeks via a private certifier) but has stricter rules on setbacks and floor space ratios. A DA goes through council and can take 3 to 6 months. We determine which pathway suits your property at the site visit and manage the entire process.

Most first-floor additions in Sydney take 6 to 9 months from design to completion. The approval stage (DA or CDC) can add 1 to 6 months depending on the pathway. Construction itself is typically 4 to 6 months. We provide a detailed schedule upfront. See our home extensions guide.

For rear extensions, usually yes. For second-storey additions, it depends on the stage. During the structural and roofing phase, there may be periods where temporary relocation is safer and more practical. We stage the build to keep disruption to a minimum and discuss the logistics with you during your free planning call so you can plan ahead.

A DA (Development Application) is assessed by your local council and can take 3 to 6 months. It allows more flexibility but involves neighbour notification and potential objections. A CDC (Complying Development Certificate) is a fast-tracked approval via a private certifier, usually taking 1 to 4 weeks, but your project must meet strict criteria on setbacks, height, and floor space ratio. We explain the pros and cons in detail in our DA vs CDC guide.

In most cases, yes. Adding liveable floor area (especially bedrooms and living space) is one of the strongest value-adds in the Sydney market. A well-designed second storey or rear extension can add significantly more value than it costs, particularly in established North Shore suburbs where land prices are high and buyers expect generous floor plans. For more on ROI, read our guide to which renovations add the most value.

The biggest cost drivers are floor area, whether you are going up (second storey) or out (rear extension), site access, slope, soil conditions, and heritage restrictions. Going up costs more due to structural engineering, scaffolding, and temporary roof work. Read our home extensions guide for more detail.

Extensions are structurally complex, so check that your builder holds an appropriate NSW licence, has HBCF insurance, and can show you recent extension projects (not just fitouts). Ask for a detailed timeline and line-item quote before signing. Our 10 questions to ask your builder guide covers everything to look for.

A second storey addition in Sydney typically starts from around $220,000 for a modest scope and can reach $300,000 to $600,000 or more for larger or premium builds. Cost is driven by floor area, structural complexity, the extent of work on the ground floor below, and the finishes you choose. Our Naremburn first-floor addition is a good example of what a premium scope involves. For an accurate figure, book a free consultation and we'll assess your specific property.

They are the same thing described two different ways. A first-floor addition and a second storey addition both refer to building a new level on top of an existing single-storey home. The new level sits above the original ground floor and typically adds bedrooms, bathrooms, or living space. This is different from a ground-floor extension, which builds outward at ground level rather than upward. If your goal is to add a master suite or children's bedrooms without reducing your backyard, a first-floor addition (second storey addition) is usually the right approach.

Construction of a first-floor addition typically takes 4 to 6 months once approvals are in hand. Add 1 to 6 months for the DA or CDC approval stage (a CDC can take as little as 1 to 4 weeks via a private certifier; a DA through council can take 3 to 6 months). Total project duration from first consultation to handover is usually 6 to 9 months, though complex sites or heritage overlays can extend this. We provide a detailed construction schedule before any work begins so you know exactly what to expect.