Home Extensions in Adelaide
Home extensions, house additions and second storey extensions across Adelaide: extra bedrooms, bigger living areas and reworked floorplans, designed, approved and built by one licensed team from concept to handover.
More space, without moving
If you love where you live but the house no longer fits, a home extension is usually the answer. We design and build house extensions that integrate seamlessly with your existing property (extra bedrooms, an expanded living zone, a bigger kitchen-dining space, or a full second storey extension) planned so the new work looks like it was always there.
As house extension builders we manage the whole process, not just the construction: the design, the engineering, council approvals, every trade on site and the finishing. Because we're renovation builders as well, the junction between old and new (rooflines, brickwork, floors and finishes) is handled properly, which is where extensions most often go wrong.
And if you're weighing up whether to extend or start again, we can give you straight advice. We build new homes as well as extensions, and we can manage a knock down rebuild (demolition, design and the new build) as one coordinated project. Sometimes extending is the smart money; sometimes the block deserves a fresh start. We'll tell you honestly which is which.
See the full range on our building & renovation services page, or browse our completed work.
Ground-floor extensions and second storey additions
If you have backyard to spare, building out is usually the simpler option. If the block is tight, going up keeps the yard: see our second storey extensions page for how that works, or compare the two in our guide to ground-floor vs second-storey extensions. Most extensions need development approval, and our guide to council approval for extensions in SA explains the process we manage for you.
We build house extensions across Adelaide, including home extensions in Gawler, where older homes often need bedrooms and living space they were never built with, and in Salisbury, Elizabeth and Munno Para. A new roof, alfresco or paved area also changes where the rain goes, so we plan the stormwater and drainage with the build.
What your home extension includes
Design & Approvals
Extension design that suits your block, your home and your budget, with engineering and council approvals managed as part of the job.
Discuss your projectStructural Build
Footings, frame, roof and lock-up, including second storey extensions, built to the National Construction Code by a licensed SA builder.
Discuss your projectSeamless Integration
Rooflines, brickwork, flooring and finishes matched into the existing home, so the addition reads as one house, not an add-on.
Discuss your projectHow your home extension runs
An extension is half new build and half renovation. One team runs every stage, so you're not left coordinating consultants and paperwork.
- Step 1
Site visit and options
Anthony looks at the house, the block and the space you need, and talks through extending out, going up or rebuilding.
- Step 2
Design and engineering
The extension is designed to suit your home and budget, with engineering and a soil test where the footings need it.
- Step 3
Approvals
Planning and building consent are lodged and managed for you as part of our design-and-construct service.
- Step 4
Itemised quote and timeframe
A detailed written quote with no hidden costs, and a schedule confirmed before work starts.
- Step 5
Structure to lock-up
Footings, frame, roof and lock-up, built to the National Construction Code, with the new roofline and brickwork matched into the old.
- Step 6
Fit-out and handover
Electrical in-house, finishes matched to the existing home, and a final walkthrough before handover.
The standard we build to
Living spaces, joinery and outdoor connections from our completed Adelaide projects. The level of finish we bring to every extension and addition.
Recent projects: Torrens Park6 Carter Street2 Allan Place
Why Adelaide extends with ASP
An extension is half new build, half renovation, and we do both. We're a licensed SA builder (BLD 360698) working across Adelaide, from Gawler and the northern suburbs to Mitcham and the inner south.
Want to know more about the team behind the work? Read about ASP Build & Co.
Old & new construction
Confident matching into existing brickwork and rooflines, and building new from slab up.
Approvals handled
Design, engineering and council approvals managed for you as part of the project.
Electrical in-house
Wiring for the new space by ASP Electrical Installations, one coordinated team on site.
One point of contact
Anthony runs the job from first design chat to final handover. One number, one standard.
Home Extensions: your questions
How much does a home extension cost in Adelaide?
The cost of a home extension in Adelaide depends heavily on its size, whether it's single or double storey, and the finishes you choose, so rather than quote a misleading figure, we visit your home, discuss what you want to achieve and provide a detailed, transparent quote with no hidden costs.
Can you build second storey extensions?
Yes. We design and build second storey extensions as well as ground-floor additions. The engineering, structure and staircase integration are all managed as part of the one project.
Do you handle council approvals for extensions?
Yes. Design, engineering and the approvals process are managed as part of our design-and-construct service, so you're not left coordinating consultants and paperwork yourself.
Should I extend my house or knock down and rebuild?
It depends on the home, the block and the budget. Because we build new homes as well as extensions, we can advise honestly, and if a knock down rebuild is the better path, we can manage demolition, design and the new build as one coordinated project.
Will the extension match my existing home?
That's the goal of every extension we build. Rooflines, brickwork, flooring and finishes are matched and integrated so the new work looks like it was always part of the house.
- How much does a home extension cost in Adelaide in 2026?
- Do you need council approval for a home extension in SA?
- Ground-floor or second-storey extension: which suits your block?
- How to choose a builder: licence, insurance, contract and deposit checks
- Soil tests and site classification for extensions and new homes
Planning a home extension?
Tell us about your home, your block and the space you need. We'll come out, talk through the options (extend up, extend out, or rebuild) and put together a clear, detailed quote.