Class 2 - Residential
High-Rise Residential Towers
Approvals typically in ~35 days
Granny Flat CDC Sydney | Secondary Dwelling Approvals
"We were quoted 4 months for council DA approval on our granny flat. We could not wait. No1 issued the CDC in 14 days. Our tenants moved in the same month."
Under SEPP Housing 2021, most NSW lots over 450sqm can have a secondary dwelling (granny flat) up to 60sqm approved via private CDC - without any council DA process.
- Secondary dwelling CDC issued under SEPP Housing 2021 - no DA required
- Maximum 60sqm floor area - confirmed against your design before submission
- Separate entrance, bathroom, and kitchen comply with NCC Volume Two
Eligibility Check
Does your backyard qualify for a granny flat CDC?
Select all that apply to your project.
You missed a few requirements.
Based on your selection, your project might require an alternative approval pathway (like a DA). You are missing:
- Located in New South Wales
- Lot size between 450sqm and 900sqm (SEPP Housing 2021 provisions)
- Granny flat is under 60sqm total floor area
- Only one secondary dwelling on the lot
- Not in a heritage conservation area
- Proposed setbacks comply with SEPP Housing 2021
Don't worry, we've got you.
Our experts can counsel you on alternative pathways and guide you through the process. Call us immediately for a free consultation.
Call 0421 936 489Granny flat.
From approval to rental income.
Secondary dwelling CDC typically issued in 10–14 business days.
Day 1
Submit Plans
Upload architectural drawings, site plan, and BASIX certificate.
Days 1–5
SEPP & BCA Review
We confirm 60sqm floor area, setbacks, BASIX, and NCC compliance.
Days 5–10
Conditions Resolved
Any minor issues addressed directly - no council intermediary.
Day 10–14
CDC Issued
Certificate signed. Your builder can begin construction immediately.
During Build
Stage Inspections
Pre-slab, frame, waterproofing - all managed on one schedule.
Completion
Occupation Certificate
Final inspection. OC issued. You can legally rent out the dwelling.
Have a question about the process? Call us - we're happy to walk you through it.
Scope of Works
Residential Certification Services
Expert guidance and fast approvals to get your residential project out of the ground sooner.
Complying Development (CDC)
Bypass council DA delays. We assess and approve Complying Development Certificates rapidly.
Perfect for new homes, duplexes & granny flats
Approval typically in 10–15 business days
We handle all government portal lodgements
Free initial eligibility consultation
Independent expert assessmentGet a quote
Ready to get started?
Get a fast-tracked quote from a licensed NSW certifier. Most clients hear back within 2 hours.
Select your project type
See the exact documents needed. No guesswork, no endless lists.
Architectural Drawings
Floor plan, elevations, sections - from your architect or draftsperson
Site / Survey Plan
Showing the existing home and the proposed granny flat location
BASIX Certificate
Mandatory energy efficiency certificate for all NSW dwellings
Structural Engineering
For footing and slab design
Hydraulic / Drainage Plan
Connection to existing drainage infrastructure
Missing something? Don't worry — we can help source it.
Start your applicationWhere We Provide This Service
No.1 Building Services provides fast, unrestricted certification across the following regions. Explore our interactive coverage map.
Greater SydneyParramattaBlacktownPenrithLiverpoolCastle Hill
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Unrestricted Authority
Our Certification Capabilities
Recent Secondary Dwellings we've certified
Class 1 & 2 - Residential
Custom Luxury Homes & Duplexes
CDCs typically in ~14 days
Class 10b - Residential
Swimming Pools & Minor Structures
CDCs typically in ~5 days
Granny flat certification - your questions answered.
Not always. Many granny flats may qualify for CDC instead of a council DA if the site and design meet the applicable standards.
A secondary dwelling is generally limited to 60m2 gross floor area, subject to the applicable planning controls and site requirements.
Yes, once the required approval and Occupation Certificate are in place, subject to the approval conditions and tenancy requirements.
A 450m2 minimum lot size commonly applies for CDC secondary dwellings, but eligibility must be checked against the site and planning controls.
We typically issue secondary-dwelling CDCs within 10-14 business days after receiving complete and compliant documents.
Get in touch
Request a quote
We'll review your project details and get back to you within 24 hours.
Unrestricted certifiers
Your project is reviewed directly by NSW-accredited certifiers - no middlemen.