School Infrastructure NSW is the second-largest sector of public construction spend in this state, and the most consistently misunderstood by the contractors who price its work. Box Hill at $300M, Jordan Springs at $90M, Medowie at $75M, Matraville and dozens of smaller refurbishments, upgrades, and additions sit live across the SINSW pipeline. The numbers are not the problem. What sits inside the existing buildings is.
Two hundred and one active education projects across the state means hundreds of head contractor margins riding on what gets discovered after the first slab opens. The risk is silent because it is documented, by both the head contractor and the principal, as a known unknown — and then priced as if it were neither.
The 1970s and 80s Slab Problem
The single most consistent source of variation on SINSW refurb work is the slab. Schools built between 1968 and 1987 sit on concrete that was poured to inconsistent standards, often with asbestos-containing additives in the bonding layers, screeds, and pipework lagging. The slab itself is usually sound. The chemistry of what is attached to it is not. Removing a vinyl floor finish to lay new is a $30,000 line item on paper and a $180,000 line item the moment the bonding compound tests positive. Multiply by the number of classrooms across a single school upgrade and the variation eats the margin.
Refurb Versus New Build — Where the Surprises Actually Live
New build is a known quantity. Greenfield SINSW work like Box Hill or Jordan Springs prices off engineered fill, designed slabs, and current materials. Refurb work is where the silent risk lives. The original drawings are partial, the as-builts are often missing or contradicted by subsequent additions, and three decades of patching by school maintenance teams have left penetrations, hidden services, and structural alterations that nobody recorded. The head contractor inherits all of it, usually at fixed price, with a generic latent conditions clause that the principal has been trained to defend.
Hazmat in Places You Stop Looking
Asbestos audits at most schools are surface-level. The HAZMAT register covers the building fabric — the wall sheets, the eaves, the ceilings. It does not consistently cover the pipework lagging, the vermiculite in the wall cavities, the bituminous waterproofing under planter boxes, or the mastic seals around demountable joins that were installed and then left in place when the demountables came out. Every one of these is a 1980s-vintage school risk that surfaces during demolition, and every one of these creates a stop-work, a re-test, an air-monitor, and a variation. None of it is priced into a standard SINSW tender.
Structural Surprises on Two-Storey 1970s Builds
SINSW refurb work on two-storey schools from the early 1970s consistently surfaces three structural issues the documentation does not flag. First, the original steel reinforcement in cantilevered walkways has corroded enough to require either supplementary support or replacement before any new load can be added. Second, the brick veneer skin on many buildings of this era was tied back with cut nails into timber framing that has shrunk, twisted, or rotted. Third, the upper-floor slabs were often post-tensioned to standards that have since been superseded, and any new penetration triggers a re-engineering review the tender did not allow for.
Scope Wording That Protects the Head Contractor
The scope wording on a SINSW refurb tender needs to do three things that standard contracts do not. First, define exactly which existing materials and assemblies are within the base scope and which trigger a variation — by name, by location, and with reference to a specific pre-tender investigation report. Second, set out a clear protocol for when work stops on a hazmat discovery, who tests, who certifies, and who pays for the program impact. Third, ring-fence the head contractor’s liability for conditions that were not reasonably discoverable from the documents provided at tender — and make the principal’s acceptance of that ring-fence a condition of award.
What Tier-1 Education Contractors Already Know
ADCO, ICON, Hutchinson, FDC, Built, and Richard Crookes all run education portfolios. The ones who finish on margin in the SINSW pipeline are the ones who have built the pre-tender investigation into their bid cost. They open inspection windows. They test the slab. They pull a ceiling tile and look at the services. They price the unknowns as a provisional sum, not a percentage contingency, and they document the assumptions in the tender response so the variation conversation is a settled one before the contract is signed. The contractors who treat refurb tenders like new-build tenders are the ones absorbing the surprises.
The Pricing Discipline That Matters
SINSW is not a hostile principal. The Project Directors running the pipeline know what is sitting inside the building stock. They are working within a procurement framework that requires them to award on price, and they rely on the head contractor’s tender response to tell them what is and is not included. The contractors who put that information in writing — with a clear distinction between base scope, provisional sums, and excluded items — are the ones building portfolios in education work. The ones who price thin and litigate later are the ones the framework eventually filters out.
Perfect Contracting acknowledges the Aboriginal and Torres Strait Isander people as Traditional Custodians of the country on which we live and work. We pay our respects to the Traditional Custodians and Elders past, present and future, and honour their connection to the land and ongoing contribution to society.