Granny flat and secondary dwelling certification in NSW
CertifiBuild provides private building certification and statutory approvals for secondary dwellings (Class 1a) across New South Wales. We manage the approval process under the State Environmental Planning Policy (Housing SEPP 2021) — handling your Complying Development Certificate (CDC), mandatory site inspections from slab to frame, stormwater sign-offs, and final Occupation Certificate.
Whether you are a builder delivering a turnkey granny flat or a property owner adding rental value, our registered certifiers keep your project compliant and moving on schedule without council backlogs.
Housing SEPP compliance assessment
Fast-tracked Complying Development Certificate (CDC) pathway validation against NSW planning criteria.
Mandatory structural & slab inspections
Critical stage inspections from foundation pour and structural framing to waterproofing verification.
Stormwater & drainage sign-off
Verification of hydraulic, plumbing, and council-approved drainage connections.
Final occupation certificate (OC)
Complete certification issued swiftly so your secondary dwelling is ready for tenancy or family use.
NSW Housing SEPP Pathway
Statutory certification stages
1. Application & CDC Assessment
Review architectural plans, setbacks, site area, stormwater plans, and BASIX compliance.
2. Mandatory Site Inspections
Slab preparation, framing inspection, wet area waterproofing, and drainage layout verification.
3. Occupation Certificate (OC)
Final inspection sign-off and lodgement on the NSW Planning Portal for legal occupancy.
Need clarification on your site setbacks or lot size eligibility?
Speak with a certifierWhy secondary dwelling certification matters
Every habitable secondary dwelling in New South Wales must comply with the Environmental Planning and Assessment Act and the Building Code of Australia before occupation.
Under NSW planning legislation, an uncertified secondary dwelling cannot be legally occupied or leased. Certification verifies the structure satisfies BCA Class 1a habitable standards.
Building without verified approval exposes property owners to stop-work notices, substantial fines, or mandatory demolition orders from local municipal councils.
Uncertified building work can void homeowner insurance policies and delay property sales or refinancing. Formal certification secures property value and rental returns.
Need approval for your secondary dwelling project?
Speak with an accredited NSW building certifier for fast, compliant approvals.
How granny flat certification works
From preliminary SEPP compliance checks to the final Occupation Certificate, our private certifiers fast-track secondary dwelling approvals across NSW without council delays.
SEPP Compliance & Preliminary Review
We assess your site plans against NSW State Environmental Planning Policy (Housing SEPP) standards, checking boundary setbacks, height limits, and lot size criteria for Complying Development Certificate (CDC) eligibility.
Document Assessment & CDC Approval
Our accredited private certifiers review architectural, structural engineering, and BASIX documentation to issue your formal Complying Development Certificate without council delays.
Mandatory Critical Stage Inspections
We act as your Principal Certifier (PC), inspecting key construction milestones to ensure the build complies with the Building Code of Australia (BCA) and approved architectural plans.
Final Inspection & Occupation Certificate
Once construction is complete, we conduct the final inspection, verify trade compliance certificates, and issue your Occupation Certificate (OC) so your granny flat can be lawfully occupied.
Need a quick SEPP eligibility assessment for your site?
Submit your property address and plans for a fast quote and turnaround estimate.
Ready to certify your granny flat build?
Connect with our accredited NSW building certifiers for fast CDC eligibility checks, construction certificates, and staged site inspections.