Anonymised QRBS case study • Brisbane

Retrospective granny flat certification and approval in Queensland.

A completed one-storey secondary dwelling—commonly called a granny flat—had no clear building approval or final certificate. QRBS coordinated the owner-side evidence pathway through assessment by an independent private certifier and final Form 21 certification.

Class 1a secondary dwellingBrisbane retrospective approvalForm 21 issued

The starting point

The building existed, but the normal construction-stage inspections had not occurred under a current approval.

QRBS first helped establish what had actually been built and the pathway needed to assess it. As-constructed plans recorded the dwelling, its layout and its relationship to the main dwelling and other structures on the property.

The application was prepared for an independent private certifier, who issued a detailed request for further information before the matter could progress to approval and final certification.

Why plans were not enough

Retrospective granny flat certification and approval required evidence across the completed building.

A floor plan alone could not demonstrate the structure, wet areas, termite protection, smoke alarms, energy measures, plumbing and fire separation. Each requirement involved a different record, consultant, licensed contractor or technical question.

Two structures were also less than 900 millimetres apart. Revised drawings and supporting evidence had to address fire separation, while historical council records were located to clarify the approval history of the nearby shed or garage.

Evidence coordinated

Different requirements needed different qualified evidence.

Plumbing

Form 4 evidence for notifiable plumbing work

Wet areas

Waterproofing certificate or leak-and-flood test

Termite protection

Termite-management certificate or pest report

Smoke alarms

Interconnected smoke-alarm compliance certificate

Structure

Form 12 aspect certificate from an RPEQ engineer

Energy efficiency

Evidence concerning wall and ceiling insulation

Plans

Revised drawings addressing ventilation and fire separation

Property records

Approval evidence for a nearby shed or garage

QRBS's approach

Separate the issues, coordinate the evidence and maintain one approval pathway.

QRBS managed the investigation and application pathway on the owner's side, assembling the completed material for assessment rather than leaving the owner to coordinate disconnected reports.

Different but complementary roles

Why QRBS was needed alongside a private certifier.

The private certifier is the assessment authority: the certifier identifies the evidence needed, assesses the application and makes the statutory certification decision.

QRBS provides the separate owner-side investigation, application management and consultant coordination needed to place a complete evidence package before the certifier. QRBS does not act as the private certifier or determine the approval outcome.

Verified outcome

Approval, a satisfactory final inspection and Form 21 certification.

The private certifier approved the retrospective second-dwelling application on 31 October 2023. The final inspection on 7 November 2023 was satisfactory, with no reinspection required. The final-stage Form 16 and Form 21 Final Inspection Certificate were issued on 8 November 2023.

The practical lesson for property owners

A granny flat is not approved merely because it has existed for years or has working services. Its classification, location, structure, fire separation and supporting records may all affect the certification pathway.

Unapproved granny flat or secondary dwelling?

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Every property, building and approval history is different. Past outcomes do not guarantee approval. The relevant private certifier and other authorities determine what evidence is required and whether it is acceptable.