In New South Wales, the formal planning term is secondary dwelling, commonly called a granny flat. It means a self-contained dwelling established in conjunction with a principal dwelling on the same lot. It may be within, attached to or separate from the principal dwelling. Its legal classification comes from the applicable planning instruments and approved documents, not its appearance or marketing name. The secondary-dwelling pathway keeps both dwellings on one lot and does not create a separately subdividable or independently saleable home. The NSW secondary-dwelling guidance outlines this statewide framework.
This guide combines limited Curban statistical context with statewide planning and consumer guidance. It does not establish what can be built on a particular property. Before selecting a design or approval pathway, identify the legal parcel and verify its zoning, planning instruments, title restrictions, existing approvals, services and relevant mapped controls.
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Local granny-flat overview
Curban is identified in the Australian Bureau of Statistics geography as Suburbs and Localities code SAL 11167. SAL means the ABS Suburbs and Localities geography: its boundaries are statistical approximations used to organise Census and other data. They are not legal parcel, zoning or council boundaries, and SAL must not be confused with SA1 or expanded as Statistical Area Level 1.
The supplied ABS spatial record places the Curban SAL wholly within the statistical LGA named Gilgandra. That LGA label is an ABS geography, whereas Gilgandra Shire Council is the formal council organisation named in the supplied official source pack. The overlap is useful for routing an initial enquiry, but it does not prove which council or consent authority is responsible for a legal parcel. Confirm the address, lot and deposited plan through current property and planning records before relying on the council’s Building & Development information or local instruments.
The 2021 Census Curban QuickStats recorded 137 people, 69 private dwellings and a median age of 40. These are historical figures from the 2021 Census, not current population, housing-demand or market evidence. The small statistical base and approximate SAL boundary make generic claims about local tenants, property types, services or development demand unsafe. No verified locality evidence supplied for this guide establishes Curban-wide zoning, hazards, lot characteristics, infrastructure capacity or secondary-dwelling potential.
At property level, first confirm that a lawful principal dwelling exists or forms part of the proposal. A freestanding structure does not qualify merely because it could function as accommodation. A garage, shed or other outbuilding should not be treated as approved for habitation without checking approved plans, certificates and its lawful current use. The same applies to an internal conversion: physical space alone does not establish planning or building compliance.
State guidance says secondary dwellings are permitted in residential zones R1, R2, R3, R4 and R5, while another zone may permit them through its local environmental plan. Permissibility is not approval. Rural and non-residential land requires particular care because local environmental plans may contain different secondary-dwelling controls. If the parcel is confirmed within the council area, consult the official Gilgandra LEP and DCP entry point and the Planning Portal record for the Gilgandra Local Environmental Plan 2011, then verify that they apply to the parcel and proposal.
Council rules and approval pathway
A secondary dwelling may require development consent or may qualify as complying development. A development application is assessed by the responsible council under the applicable planning framework. Complying development is a standards-based pathway in which council or an appropriately registered certifier may issue a complying development certificate only after every relevant requirement and exclusion has been satisfied. The official explanation of complying development describes the certifier’s role and the need to comply with approval conditions.
For the Housing SEPP complying-development pathway, NSW guidance identifies a lot area of at least 450 square metres, except when the secondary dwelling is located entirely within an existing dwelling house. This is one bounded eligibility test only. It is not a general minimum for a council-assessed development application and does not establish CDC eligibility by itself.
Check the proposal against the current State Environmental Planning Policy (Housing) 2021, including Schedule 1, and the State Environmental Planning Policy (Exempt and Complying Development Codes) 2008. Also verify the current local environmental plan, development control plan, site-specific instruments and mapped exclusions. The applicable pathway determines which provisions govern matters such as floor area, height, setbacks, landscaped area, site coverage and earthworks, so figures from another property, council or development type should not be reused.
The Housing SEPP does not itself require additional parking for a secondary dwelling. Nevertheless, the proposal may affect an existing parking space, driveway, vehicle crossing, pedestrian route or emergency access. Existing consent conditions and applicable access controls remain relevant.
Use the NSW Planning Portal Spatial Viewer to begin checking the parcel’s zoning and mapped controls, then confirm the result against the current legal instruments and council records. Obtain the title and deposited plan and investigate easements, covenants, restrictions, lawful access, sewer and drainage assets and utility locations. Planning permission does not necessarily override a private title restriction or an infrastructure owner’s requirements.
Only address a site constraint after official property evidence identifies it. Depending on the parcel, this may involve mapped or property-specific issues such as heritage, bushfire, flooding, biodiversity, contamination, coastal hazards, acid sulfate soils or mine subsidence. The Curban SAL and ABS LGA overlap do not establish whether any of these apply.
If Gilgandra Shire Council is confirmed as responsible, use its current development material and verify submission requirements, stormwater and waste provisions, driveway or vehicle-crossing requirements, contribution plans, service approvals and fees. Development applications are lodged through the official NSW online development application service. Current state legislation and Portal instructions should prevail where older council material uses legacy certification terminology.
After approval, follow its conditions, appoint the required certifier, arrange applicable inspections and retain the resulting records. Service NSW explains that an occupation certificate is required before a new building is occupied or used, or before an existing building is used for a changed purpose. The project approval and certifier determine the inspections and supporting certificates required.
Costs and budgeting
There is no verified Curban-specific construction price in the supplied evidence. Build a feasibility budget from the actual parcel, documented design and approval pathway rather than a generic package price. Ask tenderers to quote against the same survey, drawings, specifications and reports so exclusions and allowances can be compared consistently.
Include, where relevant:
- title searches, approval records, surveys and service locating;
- design, engineering, BASIX work and specialist reports;
- council, Planning Portal, certifier and authority charges, plus applicable contributions;
- demolition, excavation, retaining, disposal and site preparation;
- construction, fixtures, finishes and documented energy commitments;
- sewer, stormwater, water, electricity and communications work;
- access, paths, fencing, landscaping, waste storage and site restoration;
- inspections, certificates, insurance and handover documents; and
- an allowance determined from unresolved, property-specific risks.
Slope, access, ground conditions, existing structures, service distances, drainage, required hazard responses and finish selection can materially alter the scope. A conversion can require structural, moisture, fire-safety, ventilation, insulation and services upgrades. Prefabricated, modular or relocatable construction still requires the applicable planning, building, installation and certification processes.
Obtain current fees from the responsible council, certifier and relevant authorities after defining the proposal. In each quote, identify fixed inclusions, exclusions, provisional sums, prime-cost items and owner-supplied work. Allocate responsibility for approvals, consultant changes, unidentified services, authority upgrades, unexpected excavation and reinstatement.
Consumer-protection requirements must also be budgeted. Current Building Commission NSW contract guidance requires a written contract for residential building work costing more than $5,000 and a more extensive large-job contract for work above $20,000. It states that the maximum deposit is 10 per cent. Read the Consumer Building Guide before signing and link progress payments to completed contractual stages.
Home building compensation cover applies to relevant residential building work valued at $20,000 or more, including GST. Where required, verify the insurance certificate for the correct contractor, property and work through the official HBC Check before making a payment. Recheck the current rules when contracting.
Design and site considerations
Start with the surveyed site and verified controls, not a standard plan. Record the principal dwelling, boundaries, levels, existing structures, trees, access and visible drainage features. Define whether the secondary dwelling is internal, attached or separate and whether demolition or conversion work is involved.
Plan the relationship between the two households as carefully as the building itself. Consider safe pedestrian entry, deliveries, lighting, privacy, overlooking, daylight, ventilation, usable outdoor space, clothes drying, waste-bin movement and maintenance access. Review noise paths between nearby windows, doors, outdoor areas and mechanical equipment. Parking and vehicle movements should not compromise lawful access or the amenity of either dwelling.
Check all dimensional and site standards under the pathway identified above. Do not assume an existing garage or shed can be converted because it physically fits, or that a modular building avoids ordinary controls. Approved use, structure, fire safety, weatherproofing, ventilation, insulation, access and services may all require investigation.
Locate sewer, stormwater, water, electrical and communications infrastructure before fixing the footprint. Confirm connection methods, authority clearances and maintenance access. Resolve how stormwater can lawfully be managed without relying on an untested concept. Where trees or verified site constraints affect the design, obtain the relevant specialist input before finalising plans or prices.
BASIX addresses water, energy use and thermal performance in residential development. The project setup depends on whether the work is a conversion, a new secondary dwelling, or new principal and secondary dwellings delivered together. Follow the Portal’s secondary-dwelling BASIX guidance and incorporate certificate commitments into the drawings, specification, builder’s quote and inspection records. Early coordination reduces the risk of inconsistent documents or late redesign.
Rental and investment considerations
Before offering the premises for occupation, obtain the approved plans, relevant certificates and occupation certificate. Advertising or previous use is not evidence that an outbuilding or converted space was lawfully approved as a dwelling. Review approval conditions for any restrictions relevant to ongoing use.
Because the principal and secondary dwellings remain on one lot, consider how this arrangement affects finance, valuation, insurance, maintenance and a future sale of the whole property. Obtain advice based on the owner’s circumstances rather than treating the secondary dwelling as a separately titled asset.
If the approved premises are rented under a residential tenancy, follow current NSW Fair Trading guidance on residential tenancy agreements and the Residential Tenancies Act 2010. Use the required written agreement and current processes for bonds, condition reports, repairs, notices, safety obligations and records. Do not assume that family occupation, boarding, room rental, a licence or short-term accommodation has the same legal treatment as a standard tenancy.
Document practical arrangements for access, mail, deliveries, bins, parking, gardens, shared paths, gates and maintenance reporting. Confirm how utilities will be supplied and lawfully charged. Separate metering may require authority, technical and tenancy advice; an informal charging arrangement should not substitute for those checks.
The supplied Census data does not establish current rental demand or achievable rent. Test feasibility with recent, properly comparable evidence and distinguish advertised asking prices from completed transactions. Seek independent property-management, lending, insurance and tax advice, allowing for maintenance, vacancies, management and shared-site obligations in any assessment.
Choosing a granny-flat builder
Seek comparable tenders only after the site investigations and design scope are sufficiently developed. Give each tenderer the same plans, specification, consultant information and BASIX commitments. Compare approval responsibilities, demolition, earthworks, foundations, drainage, connections, fixtures, finishes, external works, provisional sums, exclusions, variation processes and handover requirements.
Verify the exact legal entity proposed for the contract through the official NSW builder and tradesperson licence check. Confirm that the licence is current and covers the relevant work. An ABN, association membership, review score or salesperson’s representation is not a substitute for this register check.
Request recent references for genuinely comparable secondary-dwelling work and inspect completed projects where the owner permits it. Ask about site supervision, communication, variations, defect rectification and delivery of compliance documents. Review the builder’s capability against the actual project type, particularly where it involves conversion work, restricted access, difficult ground conditions or complex services.
Use the contract required by the rules described in the budgeting section. Read the Consumer Building Guide and ensure the contract identifies the parties, approved documents, scope, price mechanism, progress stages, time allowances, extensions, variations, insurance, defects procedure and handover documents. Verify current statutory warranty information and ensure applicable warranty obligations are reflected rather than relying only on a builder’s separate commercial warranty.
Check required home building compensation evidence through HBC Check before payment. Keep the contract, insurance evidence, approvals, inspection records, variations, invoices and product documents together. At handover, obtain applicable warranties, compliance certificates, manuals, keys, as-built information and the occupation certificate. Record defects carefully and use the contractual process for rectification.
Planning and feasibility checklist
- Confirm the address, lot and deposited plan.
- Verify the responsible council and consent authority.
- Confirm the lawful principal dwelling and existing approvals.
- Check zoning, current instruments and mapped controls.
- Obtain the title, survey and service information.
- Investigate easements, restrictions, access and drainage.
- Define an internal, attached or separate proposal.
- Test both approval pathways with council or a registered certifier.
- Confirm applicable design standards and required reports.
- Select the correct BASIX project classification.
- Obtain current submission requirements, fees and contributions.
- Compare itemised quotes against one documented scope.
- Check licences, contract terms, warranties and HBC evidence.
- Obtain approval before starting work.
- Complete required inspections and approval conditions.
- Obtain the occupation certificate before occupation or use.
- Use current tenancy documents if renting the dwelling.