Adding a Second Storey to Your Adelaide Home: Know Before You Decide
Your existing structure, planning zone, and budget, not instinct, settle whether a second storey addition or rebuild is right for your property.
- Rick Buick (Dip Building Design & Tech) personally handles every Adelaide project from first sketch to council lodgement
- 19 years designing Adelaide residential projects, double brick, brick veneer, and timber-framed homes assessed without bias
- Planning and Design Code (SA) governs height, setbacks, and overshadowing, zone rules vary significantly across Adelaide suburbs
- Structural engineer assessment required before design begins, no assumptions made about existing footings or frame
- 30, 40% cost variation between same-size second storey extensions, structural scope, specification, and wet areas drive the difference
No obligation. Rick responds personally, not a sales team.
Going Up or Starting Over: How to Read the Decision Correctly
Most Adelaide homeowners at this point are running the same argument. One partner wants to add a second storey and stay put. The other wants to knock everything down and start fresh. Both are rational positions, and neither one wins on instinct alone.
The disruption of a rebuild is real. So is the constraint of designing around a structure that was never intended to carry a second floor.
Three things specific to your property settle the argument: the structural condition of your existing footings and frame, the planning zone your land sits under in the Planning and Design Code SA, and whether your budget actually matches your scope.
Rick does not earn more from a rebuild than an addition. Modern Day Concepts assesses both options against your property’s actual constraints, not a preferred outcome, and has been doing so for Adelaide homeowners since 2005.
What Your Existing House Actually Needs to Support a Second Storey Addition
Adelaide homes built between 1960 and 1985 were not engineered with a second storey in mind. That does not make addition impossible. It makes structural confirmation non-negotiable before design work begins.
A structural engineer must assess your existing footings, wall frame, and load-bearing capacity. Rick Buick (Dip Building Design & Tech) cannot make that determination, and nor can any other building designer, engineering comes first, then design.
Construction type matters here. Adelaide’s established eastern suburbs carry a high proportion of 1960s double-brick homes, and double brick frequently handles additional load better than owners expect. Brick veneer and timber-framed homes from the same period often require more significant structural remediation before a second floor addition is viable.
What the engineer finds shapes everything that follows. If underpinning or footing reinforcement is required, that cost enters the budget before any meaningful comparison with a knock-down rebuild is possible. Understand your structural position first, and the cost picture sharpens considerably.
Council Approval, Planning Zones, and What the Planning and Design Code (SA) Actually Controls
Development approval is required in South Australia for virtually all second storey additions. There is no pathway around this.
The Planning and Design Code (SA) controls height limits, setbacks from side and rear boundaries, overshadowing of neighbouring properties, and any character or heritage overlays that apply to your street. Those rules shift significantly by zone. A second storey extension in Unley or Norwood under a character overlay carries constraints that the same project in a general neighbourhood zone in Mawson Lakes does not.
Some applications move through an automated assessment pathway. Others require referral to council and neighbour notification, which extends the timeline and opens the door to objections. Planning consent in Adelaide typically runs 8 to 16 weeks depending on zone complexity and whether notification is triggered.
A poorly prepared application loses months before a single footing is touched. A building designer who knows the Code and the relevant referral patterns earns their fee well before construction starts.
What a Second Storey Extension Actually Costs in Adelaide and Why Two Projects of the Same Size Can Differ by 30 to 40 Per Cent
Three variables drive most of the cost difference between second storey additions that look identical on paper: whether the existing frame or footings need structural reinforcement, the specification level across cladding, glazing, and roofing, and whether the addition includes wet areas such as a bathroom or ensuite. Those three factors alone account for a 30 to 40 per cent swing between otherwise comparable projects.
Where a home is structurally sound, a well-scoped second storey addition regularly costs less than a knock-down rebuild at equivalent quality, once demolition and temporary accommodation are factored in. Where significant underpinning or frame remediation is required, rebuilding sometimes becomes the more rational financial path.
One past client, paraphrased from Mark Bishop’s review, came in with a clear budget, worked through every design decision with Rick directly, and reached practical completion with no hidden surprises. That outcome is not accidental. It comes from scoping the structural position early and making smart specification decisions throughout.
How Modern Day Concepts Manages the Process: From First Sketch to Building Rules Consent
Rick Buick has been designing Adelaide residential projects since 2005. Every project, from initial sketch through planning consent lodgement to building rules consent documentation, he handles personally. No junior drafter picks up your job halfway through.
If you do not have a builder, Rick can connect you with a quality custom home builder suited to the project scope.
Some clients arrive after a damaging experience with a project builder, processed rather than heard, handed a plan that never fit the brief. Gabi’s experience reflected exactly that before finding Modern Day Concepts: a previous project builder had treated a considered brief as a transaction. The approach here is different. You sit with Rick directly, your brief is heard, and the design follows from that conversation.
The full process, sketch design through to completed building rules consent, runs as a single managed sequence. Once your property is assessed, the decision stops being theoretical.
Frequently asked questions
Can I add a second storey to my existing house?
Suitability is confirmed, not assumed. A structural engineer must assess your existing footings, wall frame, and load-bearing capacity, a building designer cannot make that call alone. Double brick, brick veneer, and timber-framed homes from 1960 to 1985 all behave differently under additional load, and most established Adelaide homes can be assessed for second storey suitability. Your property’s planning zone also determines permissibility under the Planning and Design Code (SA). Modern Day Concepts has been assessing both second storey addition and knock-down rebuild options for Adelaide homeowners since 2005, without bias toward either outcome.
Do I need to re-lay the foundations before adding a second storey?
Not always, but only a structural engineer can tell you after assessing the existing footings. Reinforcing or underpinning specific sections is often sufficient. In other cases, existing slab or strip footings carry the additional load adequately without intervention. Engineering assessment must come before any design work begins. That sequence protects your budget from surprises that surface late in documentation or, worse, during construction.
Is it cheaper to add a second storey or knock down and rebuild?
Neither option is categorically cheaper. A well-scoped home second storey extension on a structurally sound Adelaide home often costs less than a knock-down rebuild at equivalent quality once demolition and temporary accommodation are counted. Where significant structural remediation is required, rebuilding may be the more rational financial decision. Modern Day Concepts assesses both paths against your actual property constraints before either option is recommended.
Do I need council approval to add a second storey to my house?
Yes. Development approval is required in South Australia for virtually all second storey additions. Applications are assessed against the Planning and Design Code (SA), covering height limits, setbacks, overshadowing, and any applicable character overlays. Planning consent in Adelaide typically takes 8 to 16 weeks depending on zone complexity, application quality, and whether neighbour notification is triggered. A well-prepared application by a building designer who knows the Code is the most reliable way to avoid delays.
How long does it take to add a second storey to a house in Adelaide?
The realistic end-to-end timeline from first consultation to practical completion is a minimum of 9 to 15 months. Design and documentation typically runs 6 to 10 weeks. Planning consent adds 8 to 16 weeks. Construction follows from there. Delays occur most commonly when applications are incomplete or when a property triggers neighbour notification under the Planning and Design Code (SA). Rick Buick handles documentation personally from first sketch to council lodgement, which removes the handover gaps where timelines typically blow out.
Mawson Lakes, South Australia, 5095