Renovations & Extensions in Adelaide
Renovating an existing house is often cheaper than knocking it down and starting over, especially when the bones are good and the location is prized. The catch is that hidden costs (asbestos, dodgy wiring, sagging stumps, non-compliant plumbing) can turn a $250k renovation into a $450k one very quickly.
Best for
- •Character stone and brick homes with sound structure
- •Established suburbs where a knock-down would trigger heritage or character overlay concerns
- •Owners who love their location and want to stay
Typical timeline
A moderate Adelaide renovation typically runs 6 to 12 months on site once consent is secured, plus 2 to 4 months of design and consent lead time.
Council & overlay notes
Every council treats renovations differently. Character overlays in Unley, Norwood, Burnside and Adelaide City are the strictest. Northern and southern greenfield councils are usually more permissive.
Get matched with the right builder for your build
A 3-minute questionnaire on budget, block type and build style. We shortlist Adelaide partner builders that fit, and hand you a comparison table. No pushy calls, no commitment.
- Under 3 minutes. 8 quick questions, no email required to see results.
- Ranked shortlist. Match score, price band, and where each builder actually builds.
- Independent. Editorial layer over paid ranking. Builders can't buy their way to the top.
Key decisions you'll face
Renovate or rebuild
The tipping point is usually around 60 to 70% of the rebuild cost. Once your renovation reaches that, a knockdown rebuild is usually the better outcome for the same money.
Scope creep control
Renovations are the single hardest project type to keep on scope. Every wall opened reveals another surprise. Set contingency and stick to it.
Live in or move out
Living in a renovation costs less but takes far longer and is genuinely stressful. Moving out costs rent but often shortens the build meaningfully.
Where builds go wrong
Asbestos in pre-1990 homes
Fibro walls, ceilings, eaves and even flooring can contain asbestos. Testing and removal is regulated and costs real money.
Non-compliant existing works
Previous DIY additions or unpermitted rooms can force retrospective compliance during your renovation.
Council notification thresholds
Some renovations that seem cosmetic actually trigger full planning consent. Confirm before you start demolition.
How the process runs
- 1
Get a pre-construction survey
Building inspection, termite check, and if the home is pre-1990, an asbestos report.
- 2
Set the scope and freeze it
Write down what is in and what is out. Every change during construction costs multiples of the design-phase cost.
- 3
Shortlist renovation-experienced builders
Not every new-build builder is set up for renovation. Look for at least five recent renovations in your council area.
- 4
Lodge for consent (if required)
Adelaide consent for a moderate renovation typically takes 6 to 12 weeks.
- 5
Live in or move out and go
Confirm the decision before construction starts. Changing mid-build is disruptive.
Common questions
When should I renovate vs knock down?▾
Roughly, if the renovation cost exceeds 60 to 70% of a rebuild cost, a knockdown is usually the smarter path. The exception is heritage or character-listed homes.
Do I need planning consent for a renovation?▾
Small internal cosmetic work rarely does. Anything structural, external or that changes the building footprint usually does. Ask your builder to confirm.
How do I control cost blow-outs?▾
Get a detailed pre-construction survey (moisture, termite, structural, electrical), set a 15 to 20% contingency, and freeze the scope before contract signing.
Can I live in the house during renovation?▾
For smaller renovations yes, but expect the project to run 30 to 50% longer. For full-house work, moving out is usually cheaper overall.
What about heritage listing?▾
Heritage-listed homes require heritage consent as well as normal planning consent. Speak to a heritage-experienced architect early.
Renovation & Extension guidance for a specific Adelaide suburb
Local overlays, character rules and site conditions all shift the plan. Pick your suburb for a per-suburb read.
Northern Adelaide
Southern Adelaide
Adelaide Hills
North-Eastern Adelaide
Fleurieu Peninsula
Also worth considering
Heritage Renovation
Heritage-listed homes are protected under the SA Heritage Places Act.
Second-Storey Addition
Adding a second storey to an existing single-storey home is the cheapest way to add bedrooms without touching your footprint or losing back-yard space.
Granny Flat
A granny flat is a self-contained secondary dwelling on the same block as an existing house.