Balcony & Strata Concrete Repairs in Sydney
On a strata building the concrete is usually common property, the decision belongs to the owners corporation, and on a Class 2 building the work falls under the NSW registration scheme. Those three facts change the process more than the repair itself changes.
What concrete cancer repair in Sydney actually involves
Most Sydney apartment blocks are Class 2 buildings, and remedial building work on a Class 2 building comes under the NSW Design and Building Practitioners scheme. In practice that means a registered design practitioner produces a regulated design for the work, and a registered building practitioner lodges it on the NSW Planning Portal before the work proceeds. It is a requirement on whoever carries out the job, and it is the main reason a strata repair takes longer to start than the same repair on a house.
How a strata repair actually proceeds
The money question is usually common property rather than cost. The structural slab of a balcony is generally common property even where one lot has exclusive use of it, which puts the repair with the owners corporation and funds it from the capital works fund or a special levy rather than from the owner. The boundary is set by the strata plan and the by-laws for that specific building, so it is established before the scope, not after.
Access is the line that moves the number. Reaching a third-floor balcony safely means scaffold, a swing stage or rope access, and on a small repair the equipment can cost more than the concrete work — one published Sydney guide puts scaffolding alone above A$15,000 on some jobs. It is also why scopes on older blocks are often written by elevation rather than by balcony: once the access is standing, repairing four balconies costs far less per balcony than repairing one.
What concrete cancer repair costs in Sydney
| Job | What it covers | Typical range |
|---|---|---|
| Minor work — guide A (Atomic Projects) | Two current published guides give a per-square-metre rate for minor concrete cancer work, and they disagree by about three times on the same description. This is the lower of the two. | A$250–600 |
| Minor work — guide B (awesim) | The same job, the higher published rate. Neither guide is wrong and neither is a quote for your building — the gap between them is the reason a real number follows an inspection. | A$700–1,500 |
| Severe or structural repair | Both guides publish the same band here — the one figure on this page the two sources agree on. | A$1,200–2,500 |
| Extensive beam or column repair | The upper band from the guide that publishes one. Structural elements rather than a balcony edge. | A$2,000–4,000 |
Ranges reflect typical Sydney jobs and vary with access, site conditions and scope. Published guide bands for concrete repair are on the pricing page. They are not quotes, and neither source states how GST is treated. A firm price comes from a site visit — call (02) 9072 0403 or use the quote form.
Balcony & Strata Concrete Repairs in Sydney — common questions
Does every owner have to agree?
The owners corporation decides, through the process its by-laws set out, and how the work is funded — capital works fund or special levy — is part of that decision. Your strata manager runs it; what a contractor supplies is the scope and the price it is decided on.
Can one balcony be done on its own?
Yes, and sometimes it is the right call — but check the cost of the access against doing the elevation. Standing scaffold for one balcony and standing it for four is close to the same equipment cost.
Does the owners corporation need a registered practitioner?
For remedial work on a Class 2 building, yes — the NSW scheme requires a regulated design produced by a registered design practitioner and lodged on the NSW Planning Portal by a building practitioner. It is a requirement on whoever carries out the work, and it is worth confirming a contractor can meet it before a scope is priced.
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