A constructability review is a structured analysis of a project's design and documentation, conducted by experienced construction practitioners before construction begins, with the specific goal of identifying issues that will create problems on site. Not theoretical risks — actual, practical problems that will cause delays, cost increases, safety incidents or quality failures if not caught and resolved in advance.
It sounds obvious. Review your design before you build it. And yet it's one of the most consistently skipped steps in the capital works delivery process.
Why owners skip them
There are a few recurring reasons. Budget pressure: the review costs money, the project is already tight, and the design looks fine to the people who produced it. Timeline pressure: there's a grant funding deadline, or a political commitment, and the programme is already stretched. And a subtler one: optimism bias. The assumption that the design team has already considered constructability, so a separate review is redundant.
That last one deserves examination. Designers are excellent at producing designs that meet the technical performance requirements of the asset. They are not always expert in how those designs translate to site — particularly in brownfield environments, live operational settings, or locations with access constraints. The skills overlap, but they're not the same discipline.
What a constructability review covers
A good constructability review goes beyond checking the drawings for clashes. It should include:
- Access and logistics: How does equipment get to site? Where is the laydown area? Is there room for the crane that the design requires?
- Sequencing: Can the works actually be built in the order implied by the design, particularly in operational or live environments?
- Interface coordination: Are the civil, structural, mechanical and electrical designs actually talking to each other, or are there gaps and clashes that will only become visible when contractors are working in the same space?
- Specification completeness: Are the performance requirements clear and testable? Ambiguous specifications become variation and defect disputes.
- Buildability in context: Brownfield sites, live plants and constrained environments often require construction methodology assumptions that the design hasn't accounted for. Does the design accommodate the way it actually needs to be built?
- Programme realism: Are the construction durations in the programme achievable? Have procurement lead times for long-lead items been accounted for?
"The most expensive constructability problem we've seen cost a council $1.4M to rectify mid-construction. The issue — insufficient headroom for a mechanical installation — would have been visible to anyone with site experience who looked at the drawings before tender."
When to do one
The most valuable point for a constructability review is at the end of detailed design, before the project goes to tender. This gives you the maximum opportunity to resolve issues without cost impact — design changes at this stage cost the consultant's time. Design changes after construction has started cost construction time, which is far more expensive.
A secondary review of the contractor's construction methodology, programme and shop drawings shortly after award is also valuable — particularly for complex or high-risk scopes.
Who should conduct it
The review needs to be conducted by someone with direct, hands-on construction experience — not a desk-based engineer reviewing drawings theoretically, but someone who has managed construction of similar project types in similar environments. Ideally, someone who has experienced the consequences of the kinds of issues the review is designed to catch.
An internal review by the design team has limited value for this purpose. The team who produced the design has implicit assumptions baked in that a fresh pair of eyes won't share. Independence is part of what makes the review work.
The bottom line
A constructability review on a $10M project typically costs $30,000–$70,000, depending on complexity. A single significant variation or delay event on the same project can cost ten times that. The arithmetic is straightforward. The harder question is whether you have the right person to run the review — experienced enough to find the problems, independent enough to call them out clearly, and disciplined enough to produce a report that's actually actionable.
Need a constructability review?
S3NTEC provides independent constructability reviews for civil, water and industrial projects across NSW. We find the issues before your contractor does.
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