Duplex & dual occupancy certification in NSW
CertifiBuild issues statutory building approvals for side-by-side and stacked duplex projects (Class 1a) across New South Wales. We manage your approval route from initial plan appraisal and Construction Certificate through to mandatory stage inspections and your final Occupation Certificate.
Boundary clearances and setbacks
Detailed assessment of front, side, and rear boundary setbacks against NSW council LEPs and the Low Rise Housing Diversity Code.
Fire separation and acoustic compliance
Verification of NCC fire-resisting wall ratings (FRL), party wall continuity, and acoustic insulation between dual occupancy dwellings.
CDC and DA approval pathways
Independent assessment for fast-tracked Complying Development Certificates (CDC) or Development Application (DA) compliance paths.
Inspections to Occupation Certificate
Mandated critical stage site inspections from initial slab pour through to final Occupation Certificate (OC) sign-off.
Why duplex certification matters
Clear approvals protect your legal title, property value, and compliance with NSW standards from day one.
Title Subdivision
Torrens or Strata title subdivision cannot be finalised without a valid Occupation Certificate.
Resale & Financing
Uncertified dual occupancies face serious resale and financing complications.
Safety & Acoustics
Certification verifies fire separation and acoustic compliance between the two dwellings, protecting both owners.
Ready to ensure complete compliance for your project?
Get a QuoteHow duplex certification works in NSW
We guide your dual occupancy project from initial fire separation checks through to your final Occupation Certificate and subdivision clearance.
Plan & fire separation review
We assess your architectural and engineering plans against the National Construction Code, focusing on acoustic ratings, boundary setbacks, and Part 3.7 fire separation walls between dwellings.
Construction Certificate issue
Once engineering certificates, Section 7.11/7.12 contributions, and DA conditions are verified, CertifiBuild issues your Construction Certificate so site works can commence safely.
Critical stage inspections
Our accredited certifiers inspect mandatory milestones: slab piers, structural framing, wet area waterproofing, and common boundary fire wall integrity during construction.
Subdivision & final OC
Following final inspection and verification of smoke alarms, plumbing, and boundary compliance, we issue your Occupation Certificate and sign off on your Strata or Torrens Title subdivision certificate.
Experienced certifiers for your dual occupancy build
Whether you are building side-by-side or attached duplexes, CertifiBuild provides prompt assessments, clear NCC guidance, and reliable on-site inspections across NSW.
Ready to certify your duplex build?
Get fast CDC assessments, Construction Certificates, and mandatory staged inspections across NSW from our private certification team.