5 DBPA Compliance Mistakes That Get Design Practitioners Fined

These aren't edge cases or obscure technicalities. They're the five most common non-compliance findings from real Building Commission audits on Class 2 buildings in NSW. Each one carries a maximum penalty of $33,000 — and most of them are entirely preventable.

1. CIRDs Lacking Sufficient Detail

This is the number one finding. By a wide margin.

The Building Commission's standard is straightforward: a Complying Industry Regulated Design (CIRD) must contain enough information for a competent builder to construct the building element without needing to ask the designer for clarification. In practice, auditors are finding:

• Missing falls to drain — Waterproofing drawings that show membranes but don't specify drainage gradients.
• Unspecified products — "Apply waterproofing membrane" without naming the product, system, or application method.
• No penetration details — Pipe and service penetrations through waterproofed areas with no detail on how they're to be sealed.
• Missing movement joint interfaces — Where different building elements meet, with no detail on how the junction is treated.
• Generic notes instead of drawn details — "Waterproofing to AS 4654.2" is not a design. It's a reference.

How to avoid it: Before lodging any CIRD, ask yourself: "Could someone build this from my drawing alone, without calling me?" If the answer is no, the drawing isn't finished.

2. Incomplete DCD Part 1 Drawing Schedules

The Design Compliance Declaration Part 1 requires a complete schedule of all drawings that form the regulated design. Every drawing must be listed with its title, drawing number, and revision.

What auditors find:

• Drawing schedules that list some drawings but not all
• Missing revision numbers — or "Rev A" when the lodged drawing is actually Rev C
• Drawing titles that don't match the actual title block on the drawing
• Entirely blank drawing schedules

This seems like a minor administrative issue. The Commission doesn't treat it that way. The drawing schedule is how they trace which designs form part of the declaration. If it's incomplete, the declaration itself is incomplete.

How to avoid it: Build the drawing schedule last, after all drawings are finalised. Cross-check every entry against the actual drawing file. Make it a sign-off step before lodgement.

3. Missing Body Corporate Registration

This one catches a surprising number of practitioners. If you practise through a Pty Ltd company, the company itself must hold a body corporate registration — separate from your individual practitioner registration.

Many engineers assume their personal registration is enough. It isn't. The DBPA requires that any body corporate that provides design practitioner services must be registered as a body corporate design practitioner. If your company isn't registered, every declaration it has issued is technically non-compliant.

How to avoid it: Check whether your company holds a body corporate registration today. If you're a sole trader, this doesn't apply. If you're a Pty Ltd, it almost certainly does.

4. Portal Lodgement Timing Failures

Under the DBPA, Design Compliance Declarations must be lodged on the NSW Planning Portal before building work commences for the relevant building element. Not during. Not after. Before.

In practice, the Commission finds:

• DCDs lodged weeks or months after building work has started
• DCDs lodged only after the builder or certifier requests them
• Amended DCDs not lodged when designs change during construction
• DCDs never lodged at all — the design exists, but the Portal record doesn't

The timing requirement isn't aspirational — it's legislative. The DBPA creates a clear sequence: design → declare → lodge → build. Breaking that sequence is a contravention.

How to avoid it: Make Portal lodgement a non-negotiable step in your project workflow. Before you issue a "proceed to build" instruction, confirm the DCD is on the Portal. Build it into your project checklist.

5. No Integration Between Disciplines

This is the finding that most practitioners don't see coming. The Commission checks whether designs from different practitioners actually coordinate with each other.

Examples:

• A structural design that doesn't account for waterproofing membrane placement
• A facade design that doesn't reference structural fixing requirements
• A fire engineer's performance solution that contradicts the architectural drawings
• Waterproofing designs that ignore the structural movement joint layout

The DBPA doesn't just require each practitioner to produce compliant designs in isolation. It expects that the designs work together. If your waterproofing drawing assumes a structural detail that the structural engineer hasn't provided, that's a gap the Commission will flag.

How to avoid it: At minimum, review the other disciplines' designs that interface with yours. Document that you've done so. If there are conflicts or gaps, raise them formally — in writing — before lodging your declaration.

The Pattern Behind These Mistakes

Notice what all five findings have in common: none of them require exceptional skill to avoid. They're not about complex engineering judgment. They're about discipline, process, and attention to administrative detail.

The practitioners who get caught by these findings aren't bad engineers. They're busy engineers who haven't built compliance into their workflow. They treat declarations as paperwork rather than professional obligations. They file things later, check things never, and assume everything is fine until someone tells them it isn't.

The Building Commission is that someone. And by the time they tell you, you're already in the audit.