The three approval pathways
Every granny flat in NSW goes through one of three approval pathways. Your pathway determines cost, timeline, and whether you need council involvement.
1. Exempt Development
No council involvement · 0 weeks approval time
What it means: Your granny flat meets all the exempt development criteria under SEPP Housing 2021, so you can build without any council application or approval.
Key requirements (all must be met):
- Total floor area ≤60m² (including any existing secondary dwellings)
- Setbacks: 3m from side/rear boundaries
- Height: ≤8.5m (measured from natural ground level)
- Single storey only
- Not located on bushfire prone land
- Not on land with a slope >18° (1:3 gradient)
- Not heritage listed or in a conservation area
- Meets Building Code of Australia (BCA) standards
- Connected to town water and sewer (or approved alternative)
What Koori does: We verify your site meets exempt development criteria during our free site assessment. If it does, we design to those limits and you start construction immediately after engineering sign-off and payment of deposit.
Cost: $0 (no council fees)
2. Complying Development Certificate (CDC)
Private certifier approval · 2–4 weeks typical
What it means: Your granny flat exceeds one or more exempt development limits (usually size >60m²), but still meets the CDC standards under SEPP Housing 2021. You apply to a private certifier (not council), get faster approval, and fewer restrictions than a full DA.
When you need CDC (any one triggers it):
- Floor area >60m² and ≤120m²
- Two storeys (max height still 8.5m)
- Reduced setback to 900mm (if no windows face that boundary)
- Site has existing secondary dwelling and combined floor area >60m²
CDC pathway requirements:
- Still must NOT be on bushfire prone land, heritage land, or slopes >18°
- Maximum 120m² total floor area
- Maximum 8.5m height
- Must be at least 6m from primary dwelling
- Carport not mandatory (unlike older SEPP rules)
- Minimum 3m setback from boundaries (900mm if no windows face that boundary)
- Connection to town water + sewer mandatory (septic rarely approved)
What Koori does: We prepare the CDC application package (plans, engineering, BASIX, site plan, stormwater plan), engage the private certifier on your behalf, and manage the approval. You sign the CDC application form and pay the certifier's fee (typically $2,000–$3,500 depending on complexity). Approval usually takes 2–4 weeks.
Cost: $2,000–$3,500 certifier fee (paid by you to certifier) + our design/engineering (included in fixed-price quote)
3. Development Application (DA)
Full council approval · 8–16 weeks typical
What it means: Your granny flat or site doesn't meet CDC or exempt criteria — usually because the land is bushfire prone, heritage listed, or you want >120m² floor area. You apply directly to council for a discretionary approval.
When you need DA (any one triggers it):
- Bushfire prone land (council planning certificate shows "Yes" under bushfire)
- Heritage listed property or conservation area
- Floor area >120m²
- Slope >18° (1:3 gradient)
- Flood affected land (council discretion)
- Environmentally sensitive land (e.g. koala habitat, endangered ecological community)
- Irregular block shape or access issues
DA pathway requirements:
- Full architectural plans + engineering
- BASIX certificate
- Bushfire Attack Level (BAL) assessment (if bushfire prone)
- Flora and fauna assessment (if required by council)
- Traffic/access report (if required)
- Neighbour notification period (14–21 days)
- Council assessment period (typically 40 days, often extends to 60–90 days)
- Possible conditions (e.g. koala-proof fencing, asset protection zones, landscaping bond)
What Koori does: We engage a town planner, prepare the full DA package, submit to council, and respond to any council requests for additional information. DA timeline is council-dependent — we can't control it, but we chase it weekly. DA is the most expensive pathway and the longest, but sometimes it's the only option.
Cost: $3,000–$8,000+ (council DA fee $1,500–$3,000 + planner $2,000–$5,000 depending on complexity) + our design/engineering (included in fixed-price quote)
Council-specific variations (Central Coast & Hunter)
All Central Coast and Hunter councils follow the NSW SEPP Housing 2021 framework, but each has local variations in how they interpret setbacks, bushfire, and stormwater. Here's what changes by council area:
Central Coast Council (Wyong + Gosford LGAs merged 2016)
| Consideration | Central Coast Council variation |
|---|---|
| Bushfire prone land | Large parts of Wyong LGA (west of Pacific Hwy) and Gosford LGA (Somersby, Spencer, Peats Ridge, Mangrove Mountain) are bushfire prone. This triggers DA pathway + BAL assessment. Check your planning certificate before quoting. |
| Sewer availability | Most urban/coastal areas connected to Sydney Water or Central Coast Council sewer. Rural areas (Yarramalong, Mangrove Mountain, Dooralong) often NOT connected — septic or aerated wastewater treatment system (AWTS) required, which usually triggers DA. |
| Flood affected land | Wyong River, Tuggerah Lake catchment, and Kariong/Somersby Creek flood zones all trigger council flood assessment. This usually forces DA pathway even if size/setback complies with CDC. |
| Koala habitat | State Environmental Planning Policy (Biodiversity and Conservation) 2021 applies. If your land is mapped koala habitat (common in west Gosford + Wyong), council requires koala habitat assessment + koala-proof fencing as a DA condition. This adds $3,000–$5,000 to DA costs. |
| Stormwater | Central Coast Council requires on-site detention (OSD) for most granny flats >60m². Your engineer designs the OSD tank (usually 3,000–5,000L underground tank). Council wants to see stormwater discharged to street, not neighbours. |
Lake Macquarie City Council
| Consideration | Lake Macquarie variation |
|---|---|
| Bushfire prone land | Western Lake Mac (Morisset, Cooranbong, Martinsville, Wyee) heavily bushfire mapped. Lakeside suburbs (Belmont, Warners Bay, Eleebana) generally not bushfire prone unless backing onto bushland reserves. |
| Sewer availability | Hunter Water sewer coverage excellent in urban Lake Mac. Rural pockets (Wakefield, Ellalong) may need AWTS. |
| Acid sulfate soils (ASS) | Lake Macquarie has significant ASS mapping around the lake foreshore and wetlands. If your site is ASS Class 1-4, council requires an ASS management plan as part of DA. This adds 2–4 weeks + $2,000–$4,000 consultant cost. |
| Foreshore building line | If your property is within 100m of Lake Macquarie foreshore, council has a foreshore building line overlay. Granny flats within this zone usually trigger DA (not CDC) regardless of size. |
| Stormwater | Lake Mac requires OSD for most granny flats. Lake Mac also has strict stormwater quality rules (gross pollutant traps, swales) if you're in a lake catchment. |
Newcastle City Council
| Consideration | Newcastle variation |
|---|---|
| Bushfire prone land | Minimal bushfire mapping in urban Newcastle. Outer suburbs (Lenaghan, Blackhill, Minmi) may be bushfire affected. |
| Heritage | Newcastle has extensive heritage overlays (The Hill, Cooks Hill, Hamilton, Wickham, Carrington). Heritage properties or contributory items in a heritage conservation area CANNOT use CDC pathway — DA mandatory, and council often refuses granny flats in heritage curtilages. |
| Sewer availability | Hunter Water sewer coverage 100% in urban Newcastle. |
| Geotechnical | Parts of Newcastle (Kotara, Adamstown Heights, Charlestown) are on reactive clay or fill. Council may request geotechnical report as a DA condition if your site has slope or fill. |
| Stormwater | Newcastle requires OSD for granny flats >60m². Newcastle also enforces Water Sensitive Urban Design (WSUD) — rainwater tanks, permeable paving, or infiltration trenches often required as DA conditions. |
Maitland City Council
| Consideration | Maitland variation |
|---|---|
| Bushfire prone land | Outer Maitland (Louth Park, Buchanan, Lambs Valley, Millers Forest) bushfire mapped. Urban Maitland, Rutherford, Thornton generally clear. |
| Flood affected land | Maitland is one of the most flood-affected LGAs in NSW (Hunter River + tributaries). Large parts of East Maitland, Maitland CBD, Lorn, Morpeth are flood zones. Council requires flood certificates + minimum floor levels as DA conditions. Flood-affected sites often can't get CDC — DA mandatory. |
| Sewer availability | Hunter Water sewer in urban Maitland, Rutherford, Aberglasslyn. Rural areas (Louth Park, Bishops Bridge, Lambs Valley) often unsewered — AWTS required. |
| Mine subsidence | Parts of Maitland LGA are Mine Subsidence District (Cessnock coalfields extend into southern Maitland). If your land is in a subsidence district, you need Subsidence Advisory NSW approval before building. This is separate to council approval and adds 4–8 weeks. |
Cessnock City Council
| Consideration | Cessnock variation |
|---|---|
| Bushfire prone land | Extensive bushfire mapping across Cessnock LGA (Pokolbin, Rothbury, Bellbird, Kitchener, Nulkaba, Wollombi). Urban Cessnock and Kurri Kurri generally clear, but check your planning certificate. |
| Mine subsidence | Large parts of Cessnock LGA are Mine Subsidence District (active and historic coal mines). Subsidence Advisory NSW approval mandatory before building anything. Adds 4–8 weeks to timeline. |
| Sewer availability | Hunter Water sewer in Cessnock, Kurri Kurri, Weston, Abermain. Wine Country (Pokolbin, Rothbury, Broke) and rural areas unsewered — AWTS required, which often triggers DA. |
| Viticulture land | Cessnock has a Rural Lands Strategy protecting viticulture land in the Hunter Valley. If your land is zoned RU2 Rural Landscape or RU4 Primary Production (Small Lots), council may refuse granny flat DA to protect agricultural use. Check zoning before quoting. |
How to find out which pathway applies to your site
Before you commission a quote or design, get your council planning certificate (Section 10.7 certificate). This tells you:
- Zoning (must be residential — R1, R2, R3, R5, or RU5 for granny flats to be permissible)
- Bushfire prone land (Yes/No)
- Flood affected (Yes/No, and what flood planning level applies)
- Heritage listing or conservation area (Yes/No)
- Acid sulfate soils class (if Lake Macquarie)
- Mine subsidence district (if Maitland or Cessnock)
- Koala habitat (if Central Coast)
- Any other overlays (coastal erosion, drinking water catchment, etc.)
You can order a planning certificate online from your council for $80–$130. It takes 2–5 business days. Or we can order it for you as part of our site assessment (cost passed through at council rate, no markup).
How Koori handles approvals for you
We don't charge separately for approval pathway management — it's included in our fixed-price granny flat quotes. Here's what we do at each pathway:
Exempt development (no council involvement)
- We verify your site meets all exempt development criteria during free site assessment
- We design to exempt limits (≤60m², single storey, 3m setbacks)
- We engage structural engineer for slab + frame certification (mandatory even for exempt)
- We obtain Construction Certificate from private certifier (usually $800–$1,200 — included in our quote)
- We notify council of commencement (online portal, takes 5 minutes)
- We book mandatory inspections (slab, frame, waterproofing, final) with certifier
- We obtain Occupation Certificate on completion
Your involvement: Sign the Construction Certificate application. Attend final handover inspection. That's it.
CDC pathway (private certifier approval)
- We prepare full architectural plans (floor plan, elevations, site plan, materials schedule)
- We engage structural engineer for full engineering package (slab, frame, wind, soil classification)
- We prepare BASIX certificate (energy + water efficiency)
- We prepare stormwater management plan (OSD tank sizing, discharge point)
- We compile CDC application package and submit to private certifier on your behalf
- We respond to any certifier requests for additional information (usually 1–2 rounds)
- We obtain CDC approval (typically 2–4 weeks from lodgement)
- We notify council of commencement
- We book and manage all mandatory inspections
- We obtain Occupation Certificate on completion
Your involvement: Sign the CDC application form. Pay the certifier fee ($2,000–$3,500 direct to certifier). Attend final handover inspection.
DA pathway (full council approval)
- We engage town planner to prepare Statement of Environmental Effects (SEE)
- We prepare full architectural plans + engineering + BASIX
- We arrange specialist reports if required (BAL assessment, koala habitat, flora/fauna, geotechnical, flood, ASS, mine subsidence approval)
- We compile DA package and lodge with council
- We track DA through council assessment (weekly chase-ups)
- We respond to council requests for additional information (often 2–4 rounds)
- We obtain DA approval (typically 8–16 weeks, sometimes longer)
- We apply for Construction Certificate (either from council or private certifier)
- We notify council of commencement
- We book and manage all mandatory inspections
- We obtain Occupation Certificate on completion
Your involvement: Sign the DA application. Pay the DA fee to council ($1,500–$3,000) and specialist consultant fees ($2,000–$8,000+ depending on reports required). If council requests changes to the design (e.g. reduced size, different materials), you approve those changes. Attend final handover inspection.
Timeline expectations by pathway
| Pathway | Approval time | Design + engineering time | Total time to start construction |
|---|---|---|---|
| Exempt development | 0 weeks (no approval needed) | 2–3 weeks | 2–3 weeks from deposit |
| CDC | 2–4 weeks (certifier assessment) | 3–4 weeks | 5–8 weeks from deposit |
| DA | 8–16 weeks (council assessment, often longer) | 4–6 weeks | 12–22 weeks from deposit |
Why our CDC-ready designs save you time and money
Our five named granny flat designs — The Darkinjung, The Awabakal, The Wonnarua, The Worimi, and The Biripai — are all pre-engineered to CDC standards. That means:
- Floor area 60–120m² (you choose size based on budget + site)
- 8.5m max height (single or two storey options)
- 3m setbacks (or 900mm to non-windowed boundaries)
- BCA-compliant layouts (ceiling heights, window sizes, room dimensions, disabled access if required)
- BASIX-compliant by design (LED lighting, ceiling fans, double glazing, water-efficient fixtures, rainwater tank all standard inclusions)
- Standard footings (designed for Class H1-H2 soil, which covers 90% of Central Coast + Hunter sites — if your soil is reactive clay Class M or Class E, we re-engineer the slab for no extra design cost)
When you choose a named design, we adapt it to your site constraints (setbacks, orientation, access, services connection points) but the core layout and engineering is already done. This cuts 2–3 weeks off the design timeline compared to a fully custom design, and it means the certifier sees a proven-compliant design (faster approval, fewer RFIs).
Custom designs are still available — if your site, budget, or brief doesn't suit a named design, we'll design a granny flat from scratch. Custom design adds 1–2 weeks to timeline and usually $3,000–$5,000 to cost (because we're engineering a one-off instead of adapting a proven design), but sometimes it's the right choice (e.g. unusual block shape, heritage constraints, specific accessibility needs, or you want 3 bedrooms instead of 2).
Common approval traps (and how we avoid them)
Trap 1: "My mate said I don't need council approval"
Half-true. If your granny flat is ≤60m², single storey, 3m setbacks, not on bushfire/heritage/flood land, and meets all other exempt criteria, then yes — no council approval needed. But if you exceed even one exempt limit, you need CDC or DA. Don't rely on your mate's advice — get the planning certificate and a builder's site assessment.
How we avoid it: We order your planning certificate (or review the one you provide) and verify exempt/CDC/DA pathway in writing before you commit to a quote.
Trap 2: Building before getting approval (CDC/DA sites)
If your site requires CDC or DA and you start building before approval, council can issue a stop-work order and force you to demolish. This happens 2–3 times a year in Central Coast alone (council prosecution notices are public record). Don't risk it.
How we avoid it: We don't order materials or book concreters until we have CDC or DA approval in hand. If you're in a rush, we fast-track the design and certifier lodgement, but we never skip the approval.
Trap 3: Assuming bushfire = deal-breaker
Bushfire prone land triggers DA pathway (not CDC), and you'll need a BAL assessment + bushfire construction requirements (ember protection, non-combustible cladding, metal windows). This adds $8,000–$15,000 to build cost and 8–12 weeks to approval time. It's not a deal-breaker, but you need to budget for it.
How we avoid it: We tell you on Day 1 if your site is bushfire prone (it's on the planning certificate). We get the BAL assessment done early (during DA prep, not after DA approval). We spec bushfire-compliant materials from the start so there's no variation cost later.
Trap 4: Forgetting about sewer/water connection costs
Council approval is one thing. Connecting to town sewer + water is another. If your property isn't already connected (common in rural Central Coast, Maitland, Cessnock), you'll pay Sydney Water or Hunter Water $5,000–$15,000+ for new service connections. If sewer isn't available, you'll need an AWTS ($8,000–$12,000 installed) and council DA approval for the AWTS (separate to granny flat DA).
How we avoid it: We check Sydney Water / Hunter Water service diagrams during site assessment. We tell you if new connections are needed and what the cost will be. If AWTS is required, we factor that into the quote and DA timeline.
Trap 5: Choosing a design that doesn't suit your approval pathway
Example: you want The Wonnarua (78m² two-storey design), but your site is bushfire prone. Bushfire = DA mandatory. Two-storey on bushfire land often triggers council concerns about defendable space and BAL ratings. Council might approve it, but with conditions that force expensive upgrades (e.g. BAL-29 construction, which adds $12,000–$18,000 to build cost). Better choice: single-storey Darkinjung 60m² (exempt development if not bushfire) or accept the bushfire cost and go two-storey anyway.
How we avoid it: We match the design recommendation to your site constraints. If bushfire is a factor, we'll recommend single-storey unless you specifically want two-storey and understand the cost implication.
What happens after approval?
Once you have CDC or DA approval (or exempt development verification), we move to construction phase:
- Construction Certificate (CC): We obtain CC from the private certifier (if CDC pathway) or from council or private certifier (if DA pathway). CC certifies that the design complies with the Building Code of Australia. This takes 1–2 weeks. Cost: $800–$1,500 (included in our quote).
- Notice of commencement: We lodge online notice with council that construction is starting (mandatory, takes 5 minutes, no cost).
- Construction: We build the granny flat per the approved plans. Typical build time: 12–16 weeks for single storey, 16–20 weeks for two storey (weather dependent).
- Mandatory inspections: The certifier inspects at key stages: (a) slab pour, (b) frame erection, (c) waterproofing (wet areas), (d) final inspection. We book these and notify you when to be on site (you don't need to attend, but you're welcome to).
- Occupation Certificate (OC): After final inspection passes, the certifier issues OC. This is the legal document that says the granny flat is safe to occupy. We hand you the keys + OC + maintenance manuals on handover day.