A secondary dwelling—commonly called a granny flat—is 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 depends on the approved use and development documents, not its marketing name or construction method.
This guide combines limited Burren Junction statistical context with statewide planning, building and consumer-protection guidance. It does not establish what can be built at a particular address. Zoning, title restrictions, existing approvals, mapped controls, services, site conditions and the proposed design must all be checked for the legal parcel.
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Local granny-flat overview
The locality record identifies Burren Junction as Australian Bureau of Statistics Suburbs and Localities geography, code SAL10707. SAL means Suburbs and Localities; it is not Statistical Area Level 1 and must not be equated with SA1. SAL boundaries are statistical approximations designed for Census reporting. They are not cadastral boundaries, zoning maps, council determinations or evidence of development rights.
The supplied spatial record gives the Burren Junction SAL an area of 1,354.2578 square kilometres, eight mesh blocks and an overlap with the ABS statistical LGA named Walgett. These are geographic data points only. The statistical LGA name Walgett should be distinguished from the formal council organisation name Walgett Shire Council, identified in the supplied Data.NSW organisation record. Neither the SAL nor LGA overlap proves that the council is the consent authority for a particular parcel; verify the address and lot details first.
The 2021 Census All persons QuickStats for Burren Junction reported 225 people and 132 private dwellings. Those values are historical context from the 2021 Census, not current population or housing-market evidence. The small statistical base and elapsed time make broad claims about present demand, household preferences, rents, vacancy or development feasibility unsafe.
Under the NSW secondary-dwelling guidance, a secondary dwelling remains in conjunction with the principal dwelling on the same site. This pathway does not create a separately subdividable, separately titled or independently saleable residence. A freestanding building is not automatically a secondary dwelling, and an existing shed, garage or studio cannot be treated as approved accommodation without checking its approval history and lawful use.
State guidance says secondary dwellings are permitted in residential zones R1, R2, R3, R4 and R5 and may be permitted in other zones where the applicable local environmental plan allows them. Permissibility is not approval. Burren Junction includes no verified area-wide evidence here about parcel zoning, lot configuration, hazards, services or building capacity, so those matters must not be inferred from the locality name.
For a specific address, identify the lot and deposited plan and search the NSW Planning Portal Spatial Viewer. Compare the displayed zone and planning layers with the current legal instruments and property records. Online mapping is a starting point; title searches, surveys, planning certificates and approval records may disclose matters that a locality profile cannot.
Council rules and approval pathway
There are two potential assessment pathways. A development application is assessed by the relevant consent authority, while a complying development certificate may be issued by council or a registered certifier only if every applicable requirement is met. A certifier applies the standards and cannot waive statutory prerequisites or mapped exclusions. The Department’s complying-development guidance explains this standards-based process.
For the Housing SEPP complying-development pathway, official guidance identifies a minimum lot area of 450 square metres, except where the secondary dwelling is located entirely within an existing dwelling house. This is one eligibility condition only. It is not a universal minimum for a council-assessed application and is not sufficient by itself to establish CDC eligibility.
Test the proposal against the current State Environmental Planning Policy (Housing) 2021, including its relevant schedule, and the State Environmental Planning Policy (Exempt and Complying Development Codes) 2008. Current instruments should be used instead of superseded Affordable Rental Housing SEPP guidance. The applicable standards depend on the site, existing principal dwelling, proposal type and selected pathway.
After confirming the parcel is within its local government area, Walgett Shire Council would ordinarily assess a development application. The supplied official source pack identifies the Walgett Local Environmental Plan 2013 as the local environmental planning instrument and states that development applications are lodged online through the NSW Planning Portal. The Department’s development-application lodgement guidance describes that process. Applicability must still be confirmed for the legal parcel, together with any current development control plan, contribution plan, policy or site-specific instrument.
This verification is particularly important for rural or non-residential land. Some local environmental plans contain special rural-zone secondary-dwelling provisions, and residential-zone assumptions cannot be transferred to those properties. Ask the council or a qualified planner to confirm permissibility and the relevant controls from the current instrument.
Before choosing a pathway, check:
- the title, deposited plan, easements, covenants and restrictions;
- the lawful status of the principal dwelling and any structure proposed for conversion;
- legal access, boundaries, levels and available building area;
- sewer or wastewater arrangements, drainage and utility locations;
- mapped controls and any property-specific constraints shown by official records;
- council application documents, contributions, waste, stormwater and vehicle-crossing requirements; and
- the current requirements of relevant water, sewer and utility authorities.
Planning approval may not override private title restrictions. Likewise, the absence of a layer from a general search should not be treated as conclusive property advice.
The Housing SEPP does not itself require additional parking for a secondary dwelling. Existing consent conditions, removal of parking, driveway design, access safety and other applicable controls can nevertheless affect the proposal.
Following approval, the work may require construction certification, a principal certifier, specified inspections and evidence that approval conditions have been met. Service NSW explains when and how to apply for an occupation certificate. Obtain the required certificate before a new building is occupied or an approved change of use begins.
Costs and budgeting
A Burren Junction project budget should be based on the investigated parcel, approved scope and documented inclusions. Generic package prices cannot account for site access, ground conditions, service availability, earthworks, approval requirements, conversion work or finish selections.
Build the estimate under separate headings:
- title, survey, planning and service investigations;
- design, engineering and specialist reports;
- application, certifier and authority charges;
- contributions where applicable;
- demolition, excavation, retaining and site preparation;
- building work, fixtures and finishes;
- stormwater, wastewater, water, electricity and communications connections;
- paths, driveways, fencing, landscaping and waste removal;
- certificates, inspections, insurance and handover documentation; and
- a clearly identified allowance for unresolved site risks.
Confirm service locations and capacity early. Long connections, restricted machinery access, unsuitable ground, drainage work or an unverified wastewater solution can change both design and price. A conversion also requires investigation of the existing structure’s lawful use, condition, structural capacity, fire safety, waterproofing, insulation, ventilation and services.
Request itemised, like-for-like quotations based on the same drawings, specifications and site information. Each quote should identify exclusions, provisional sums, site assumptions, authority charges, connection responsibilities, BASIX items and external works. Keep confirmed prices separate from allowances so unresolved items remain visible.
Building Commission NSW contract guidance requires a written contract for residential building work costing more than $5,000, with more extensive large-job contract requirements above $20,000 and a maximum deposit of 10%. Read the Consumer Building Guide and align progress payments with completed stages.
Home building compensation cover applies where required for residential building work valued at $20,000 or more including GST. Before paying money or allowing work to begin, use the official HBC Check to verify the certificate, insured legal entity, site and contracted work. Check current council, authority and insurance material when quotations are finalised because fees and requirements can change.
Design and site considerations
Begin with an accurate survey and a clear description of whether the secondary dwelling will be internal, attached or separate. That choice affects planning classification, construction interfaces, documentation, privacy, access and the correct BASIX secondary-dwelling project type.
Map boundaries, levels, existing buildings, access, significant trees, easements and known services before fixing the footprint. Test the design for daylight, ventilation, visual and acoustic privacy, usable outdoor space, safe pedestrian access, bin storage, clothes drying and maintenance access. Consider how occupants of both dwellings will use shared paths, driveways and outdoor areas.
Check floor area, setbacks, height, landscaped area, site coverage and earthworks against the exact pathway and current controls. Do not import dimensions from another council, an earlier planning instrument or a different development type. If parking or manoeuvring areas will change, assess the practical and approval consequences with the certifier or council.
Resolve stormwater and wastewater arrangements during feasibility. Confirm lawful discharge, infrastructure capacity, utility approvals and any easements affecting connections. Locate underground and overhead services before excavation. Where official parcel information identifies a relevant constraint, obtain the required specialist advice and incorporate its recommendations into the design; do not apply a generic locality-wide constraint list.
The NSW Planning Portal explains that BASIX addresses water, energy use and thermal performance. Treat its commitments as design inputs rather than paperwork added after tender. Coordinate orientation, glazing, shading, insulation, ventilation, fixtures and building services, then carry the approved commitments through the drawings, specification, contract and completed work.
Prefabricated, modular or relocatable construction does not avoid planning, building, certification or occupation requirements. Similarly, physical room for a kitchen and bathroom does not make an outbuilding suitable for conversion. Obtain approval records and professional assessments before relying on an existing structure.
Rental and investment considerations
Consider rental use only after confirming lawful approval, construction in accordance with that approval and the required occupation certification. A utility connection, builder’s completion statement or advertising description does not establish lawful residential occupation.
Because a secondary dwelling remains on the principal dwelling’s lot, ownership, lending, insurance and management should be assessed on that basis. Obtain advice suited to the actual title and intended occupancy rather than modelling it as an independently saleable property.
If the premises will be rented under a residential tenancy, follow NSW Fair Trading’s current guidance on residential tenancy agreements and the Residential Tenancies Act 2010. Use the applicable written agreement and current processes for bonds, condition reports, disclosures, repairs, safety obligations and notices.
Family occupation, boarding, licences, short-term accommodation and standard residential tenancies are not necessarily governed in the same way. Check the intended arrangement with NSW Fair Trading, the council or a legal adviser before occupation.
Plan how separate access, privacy, waste, deliveries, clothes drying and maintenance will work for both households. Document responsibility for gardens, shared infrastructure and common areas. If services are shared, establish a lawful and understandable method for managing charges and maintenance.
The 2021 Census figures do not establish current rental demand or achievable income. For feasibility, obtain recent evidence from an appropriately qualified local professional and distinguish advertised prices from completed transactions or achieved rents. Discuss the proposal with the lender, insurer, tax adviser and financial adviser using the approved design and the owner’s circumstances.
Choosing a granny-flat builder
Identify the legal entity that will sign the contract and use the official Service NSW register to check the builder or tradesperson licence. Match the entity name and licence number to the contract, confirm the licence is current and verify that its category covers the proposed work. An ABN, industry membership or online review is not a licence check.
Seek recent references for comparable secondary dwellings and, where possible, inspect completed work with the owner’s permission. Ask past clients about communication, site-cost management, variations, defects, documentation and after-completion service.
Give each tenderer the same drawings, reports and requested scope. Compare:
- inclusions, exclusions, specifications and provisional sums;
- excavation, retaining, access and ground assumptions;
- stormwater, wastewater and utility responsibilities;
- approval, certification and inspection responsibilities;
- BASIX products and performance commitments;
- external works and waste removal;
- variation procedures and time allowances;
- defect rectification and handover documents; and
- statutory warranty information and any additional warranties offered.
Clarify whether the price is based on approved construction documents or an early concept. Record who will coordinate consultants, answer council or certifier requests, arrange inspections and supply evidence needed for occupation certification.
Use the appropriate written contract and read the Consumer Building Guide referenced in the Building Commission guidance. Verify that statutory warranty information is correctly presented, keep progress payments tied to documented completed work and put agreed variations in writing before the varied work proceeds where practicable. Apply the contract and home building compensation checks described in the budgeting section before payment or commencement.
At handover, obtain approvals, certificates, inspection records, BASIX evidence, warranties, manuals, keys and defect records. Assess tenders by complete delivered scope and documented risk allocation, not the headline price alone.
Planning and feasibility checklist
- Confirm the address, lot, deposited plan, title and lawful principal dwelling.
- Verify the local government area and responsible consent authority.
- Check zoning and mapped controls in the Spatial Viewer.
- Review the current local and state planning instruments.
- Obtain title, survey, approval-history and service information.
- Investigate relevant easements, restrictions, access and site constraints.
- Define the proposal as internal, attached, separate or a conversion.
- Test both assessment pathways with council or a registered certifier.
- Confirm design standards, BASIX requirements, reports and documents.
- Verify current fees, contributions and authority requirements.
- Compare itemised quotes on an identical scope.
- Check licences, contract terms, warranties and compensation cover.
- Obtain approval before starting work.
- Complete required inspections and approval conditions.
- Obtain the occupation certificate before occupation or use.
- Establish the applicable tenancy process before renting.