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.
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 projectThe 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.
Why Adelaide extends with ASP
An extension is half new build, half renovation — and we do both every week. We're a licensed SA builder (BLD 342431) working across Adelaide, Gawler and the northern suburbs.
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.
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.