The Design and Building Practitioners Act 2020 (DBP Act) has now been in force long enough that the NSW construction industry has no excuse for being caught flat-footed. And yet, time and again, builders — particularly those working in the Tier 2 and 3 residential space — are walking into the same avoidable traps. Some of these mistakes are costly. A few are catastrophic. Here's where it goes wrong.
1. Treating DBP Compliance as the Certifier's Problem
This is the most prevalent misconception in the industry: that compliance declarations are paperwork for someone else to sort out. They are not.
The DBP Act places positive obligations on registered practitioners — designers, engineers, and builders — to declare that their work complies with the Building Code of Australia before construction advances to the next regulated stage. Your principal certifier oversees the process; they do not own it. When a builder fails to coordinate timely regulated design lodgements, the job simply cannot legally proceed. Progress claims stall. Trades stand around. The builder wears the programme cost.
Builders who treat DBP compliance as an administrative afterthought rather than a live project management function consistently find themselves scrambling at slab, frame, and waterproofing stages.
2. Not Understanding What "Regulated Design" Actually Covers
Ask a site manager what a regulated design is, and you'll often get a blank stare or a vague gesture toward the architectural drawings. The Act is more specific than that.
A regulated design is a design document prepared by a registered design practitioner for a regulated building element — which includes structural systems, fire safety systems, waterproofing, and building enclosure, among others. These must be lodged on the NSW Planning Portal before the builder commences that element of work on site. Not after. Not concurrently. Before.
The failure mode here is builders commencing structural or waterproofing work under time pressure before the relevant regulated design has been declared and lodged. That single decision can trigger a non-compliant building notice, require retrospective rectification, and create personal liability exposure for the builder as a regulated practitioner in their own right.
3. Underestimating the Builder's Own Registration Obligations
Since the DBP Act's expansion, builders carrying out Class 2 building work — and increasingly other building classes as the regime matures — must themselves be registered as building practitioners under the scheme, not merely hold a contractor licence. These are separate obligations.
Many builders conflate their contractor licence with DBP registration. They are distinct. A contractor licence governs your right to contract for building work. DBP registration governs your right to declare that building work is compliant. Without the latter, you cannot issue a building compliance declaration, which is required before an occupation certificate can be granted. Running a job to practical completion only to discover you cannot legally sign off on it is an expensive lesson.
4. Consultant Coordination Failures at the Regulated Design Stage
Even where builders understand the framework, execution breaks down at the consultant interface. The typical failure pattern: the builder assumes the architect is managing the regulated design declarations. The architect assumes the builder has briefed the engineer. The engineer has issued drawings but not formal declarations. Nobody has lodged anything on the Planning Portal.
This is a coordination vacuum, and the DBP Act provides no tolerance for it. The regulated design must be declared and lodged by the registered design practitioner before work commences on that element. A drawing set sitting in a Dropbox folder is not a regulated design for the purposes of the Act, regardless of how complete or detailed it is.
Builders who don't have a dedicated process for tracking regulated design lodgements — across architecture, structure, fire, and hydraulics — will repeatedly hit this wall.
5. Confusing "As-Built" With "Compliance Declaration"
At the other end of the job, a different problem emerges. Builders approaching practical completion often conflate as-built documentation with the building compliance declaration required under the Act.
An as-built drawing records what was built. A building compliance declaration is a statutory instrument in which the registered builder declares that the building work as executed is consistent with the regulated designs and complies with the BCA. These are not the same document, they are not interchangeable, and the compliance declaration is a prerequisite for your certifier to issue an occupation certificate.
Builders who haven't maintained a live record of variations, substitutions, and departures from the regulated designs throughout the build find themselves unable to make an honest compliance declaration at the end — because they genuinely don't know whether the building as constructed aligns with what was lodged.
6. Ignoring the Portal as a Live Project Management Tool
The NSW Planning Portal is not a filing cabinet for the end of the job. Regulated designs must be lodged progressively as each stage is reached, and variations to declared designs must be lodged before the varied work is carried out.
Builders who treat portal lodgement as a box-ticking exercise at handover will find the portal becomes a liability register — a documented record of every instance where work proceeded without proper declaration. That documentation doesn't disappear.
The Underlying Problem
Most of these failures share a root cause: builders treating the DBP Act as a compliance layer bolted onto the outside of their normal delivery process, rather than integrating it into how projects are sequenced and managed from day one. The regulated design framework was deliberately designed to shift responsibility and liability upstream and onto the practitioners doing the work. That shift is real, and it has teeth.
The builders who navigate it well are the ones who treat consultant coordination, portal lodgement, and declaration management as core delivery functions — not an afterthought for the DA manager or the certifier to clean up.
Design Command helps NSW residential builders manage the DA-to-CC lifecycle, including regulated design coordination, Planning Portal lodgement, and DBP compliance tracking. If your current design management process has gaps, please contact us.
