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 documents, not a marketing label or construction method.
This guide combines limited locality evidence with the statewide planning framework. It does not establish the zoning, approval pathway or development capacity of an individual property. Those matters require the legal parcel, current planning instruments, title information, site conditions and proposal to be checked together.
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Local granny-flat overview
The canonical locality record identifies Come By Chance as Australian Bureau of Statistics Suburbs and Localities geography, code SAL10993. SAL means the ABS Suburbs and Localities geography. Its boundaries are statistical approximations used to report data; they are not cadastral parcel boundaries, planning zones or proof of council jurisdiction. SAL must not be confused with Statistical Area Level 1 or SA1.
The supplied locality record gives the Come By Chance SAL an area of 761.9641 square kilometres and one mesh block. It records the entire statistical area as overlapping the ABS statistical LGA named Walgett. This identifies an ABS geography, not the formal name of a council organisation. The source pack separately identifies the relevant organisation as Walgett Shire Council. Even though the supplied overlap contains one LGA, council responsibility for a legal parcel should be confirmed from its address, lot and deposited plan rather than inferred from SAL overlap.
The 2021 Census Come By Chance QuickStats reported 88 people, 55 private dwellings and a median age of 35. These are historical values from the 2021 Census edition, not current population, housing or property-market evidence. The small population also makes broad claims about local demand, household preferences or market performance unsafe. Census data cannot establish planning rights or describe the present condition of a particular property.
Under the NSW Government’s secondary-dwelling guidance, the principal and secondary dwellings remain on the same lot. The secondary-dwelling pathway does not produce a separately subdividable, titled or saleable residence. A building is not a lawful secondary dwelling merely because it contains residential facilities, and an existing garage, shed or studio cannot be presumed approved for habitation.
The statewide guidance says secondary dwellings are permitted in residential zones R1, R2, R3, R4 and R5 and may be permitted in other zones through the applicable local environmental plan. Permissibility is not approval. Rural and non-residential land must be assessed under the provisions applying to that parcel, including any locally adopted rural-zone controls, rather than by transferring residential-zone assumptions.
For a Come By Chance property, start with the legal parcel and search it in the NSW Planning Portal Spatial Viewer. The viewer is useful for finding zoning, environmental planning instruments and mapped controls, but its results should be checked against the current legal instrument and property records. No locality-wide conclusion can be made here about zoning, lot configuration, services, hazards or building potential.
Council rules and approval pathway
A secondary dwelling may be assessed through a development application or, where every relevant requirement is met, as complying development. For a development application on a verified Walgett Shire parcel, the ordinary consent authority identified in the source pack is Walgett Shire Council. Applications are lodged online through the Planning Portal; the Department explains the submission process in its guide to lodging an assessment-ready development application.
The local planning framework includes the Walgett Local Environmental Plan 2013, subject to confirmation that it applies to the legal parcel and remains current when the application is prepared. Also ask the council whether a development control plan, policy, contribution plan or site-specific instrument applies. The supplied research did not establish a separate current Walgett-specific development control plan, so its existence or application should not be assumed either way.
Complying development is a standards-based approval pathway. A complying development certificate may be issued by a council or appropriately registered certifier only after all applicable requirements and exclusions have been satisfied. The Department’s complying-development guidance explains the certifier’s role; a certifier cannot waive statutory planning standards.
For the Housing SEPP complying-development pathway, NSW guidance identifies a lot area of at least 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 development application and does not make complying development available automatically.
Test a proposed complying-development pathway against current Schedule 1 of the State Environmental Planning Policy (Housing) 2021, the relevant provisions of the State Environmental Planning Policy (Exempt and Complying Development Codes) 2008, mapped exclusions and property-specific standards. Use the current in-force instruments rather than superseded Affordable Rental Housing SEPP material.
Before selecting either pathway, confirm:
- the lawful existence and approved use of the principal dwelling and any structure proposed for conversion;
- the zone and current local and state planning instruments;
- title restrictions, covenants, easements, legal access and deposited-plan information;
- sewer, wastewater, stormwater, drainage and utility arrangements;
- mapped or property-specific constraints identified by official evidence; and
- council requirements for documents, waste, driveways, vehicle crossings, contributions and fees.
The Housing SEPP does not itself require additional parking for a secondary dwelling. Existing parking, consent conditions, safe access, driveway geometry and the effect of the proposal on vehicle movement may still require assessment.
Approval is followed by the applicable construction certification, inspections and compliance with certificate conditions. Service NSW explains that an occupation certificate is required before occupying or using a new building, or using an existing building after an approved change of use. A concept plan, quotation or BASIX certificate is not development approval.
Costs and budgeting
There is insufficient verified evidence for a reliable Come By Chance construction price, and generic package advertising cannot account for an individual site. Prepare a project budget from completed investigations, coordinated documents and itemised quotations.
Separate the budget into:
- title, survey, planning and service investigations;
- design, engineering and specialist reports;
- application, certifier, authority and inspection charges;
- contributions where the applicable plan requires them;
- demolition, earthworks, retaining and site preparation;
- building work, fixtures, finishes and external works;
- stormwater, wastewater and utility connections;
- BASIX documentation and specified commitments;
- insurance, finance and handover costs; and
- an allowance for documented but unresolved project risks.
Access, ground conditions, service locations, existing structures, approval requirements and finish selections can materially alter the completed scope. For a conversion, investigate the building’s approval history, structure, moisture management, fire safety, insulation, ventilation and services before pricing residential use.
Give each tenderer the same drawings, specification and site information. Require clear treatment of exclusions, provisional sums, utility-provider work, spoil removal, rock, external works, approval responsibilities and product substitutions. Verify current council and authority fees directly rather than carrying forward figures from another project.
Building Commission NSW contract guidance requires a written contract for residential building work costing more than $5,000, with more extensive large-job requirements above $20,000. The maximum deposit is 10%. Read the Consumer Building Guide and make progress payments correspond with completed contractual stages.
Home building compensation cover applies where required for residential building work valued at $20,000 or more, including GST. Before paying money or permitting work to start, use the official HBC Check to verify the certificate, insured legal entity, site and work. Recheck current statutory thresholds and contract requirements before signing because the figures and rules can change.
Design and site considerations
Define whether the proposal is internal, attached, detached or a conversion before developing the design. That distinction affects documentation, construction interfaces and the correct BASIX secondary-dwelling project classification.
Obtain a site survey showing boundaries, levels, existing buildings, access, relevant trees and easements. Position the proposed dwelling with regard to daylight, ventilation, privacy, overlooking, noise, usable outdoor space, pedestrian access, waste storage, clothes drying and maintenance. Consider how occupants of both dwellings will share or separate entrances, paths, driveways and services.
Check floor area, setbacks, height, landscaped area, site coverage and earthworks against the confirmed approval pathway and current instruments. Do not import a number from another council, another development type or an old planning instrument. Where local provisions apply, verify them for the parcel and proposal.
Resolve wastewater, stormwater and utilities during feasibility. Confirm connection locations and capacity, lawful stormwater discharge, authority approvals and access for construction. Review title documents before placing structures or services over easements or near infrastructure. Planning permission does not necessarily remove private title restrictions or authorise interference with utility assets.
Only investigate a hazard or overlay as applicable to the property when official mapping or records identify it. The Spatial Viewer is a screening tool; specialist reports may then be needed for verified issues. This avoids both overlooking a genuine constraint and burdening a project with unsupported locality assumptions.
BASIX addresses water, energy use and thermal performance for applicable residential development. Incorporate its commitments into orientation, glazing, shading, insulation, ventilation, fixtures and services before tendering. Approved commitments should be consistent across the certificate, drawings, specifications and building contract.
Prefabricated, modular or relocatable construction does not bypass planning, building, BASIX or certification requirements. Similarly, physical room for a fit-out does not establish that an outbuilding can lawfully become a dwelling. Check approval records and obtain the required design and technical advice first.
Rental and investment considerations
Rental analysis should begin only after confirming the dwelling’s lawful approval and occupation status. A secondary dwelling remains part of the same lot as the principal dwelling, so ownership, lending, insurance and management should be considered on that basis rather than as a separate titled asset.
If the approved premises are rented under a residential tenancy, use current NSW Fair Trading guidance on residential tenancy agreements and the Residential Tenancies Act 2010. Check the current requirements for the written agreement, bond, condition report, disclosures, repairs, safety obligations and notices.
Family occupation, boarding, licensing, short-term accommodation and a standard residential tenancy are not necessarily treated alike. Confirm the legal and planning requirements for the intended arrangement instead of assuming that approval for one form of occupancy authorises another.
Plan practical responsibilities before occupation. Address privacy, access, deliveries, waste, gardens, shared paths, parking, maintenance and emergency communication. If utilities are shared, document how consumption and charges will be handled and obtain advice on lawful metering or on-charging arrangements.
The limited Census evidence does not support a Come By Chance rent, vacancy or demand conclusion. For feasibility, obtain current comparable rental evidence from appropriately qualified local professionals and distinguish advertised asking prices from achieved rents. Check whether each comparison is similar in approval status, condition, access, services and inclusions.
Owners should also obtain advice suited to their circumstances from their lender, insurer, tax adviser and financial adviser. Use that advice to test the proposed occupancy and ownership arrangement rather than relying on generic assumptions about borrowing, tax treatment or property performance.
Choosing a granny-flat builder
Identify the legal entity that will sign the contract, then use the official Service NSW tool to check the builder or tradesperson licence. Confirm that the licence is current, its category covers the work, and the entity name and licence number match the proposed contract. An ABN, association membership or online review is not a substitute for this check.
Ask for recent references from comparable secondary-dwelling projects and inspect completed work where permission is available. Discuss communication, variations, site-cost control, defects, documentation and after-completion service. Establish whether the quoted work is based on an approved design or an early concept that may change through assessment.
Compare tender responses for:
- inclusions, exclusions and specification detail;
- allowances, provisional sums and site assumptions;
- excavation, retaining, drainage and service connections;
- responsibility for approvals, consultants and certification;
- BASIX products and performance commitments;
- external works, waste removal and reinstatement;
- variation and extension-of-time procedures;
- defect rectification, handover documents and approvals; and
- applicable contractual and statutory warranty information.
Use the appropriate written contract and read the Consumer Building Guide before signing. Ensure progress claims align with completed work, and document agreed variations with their scope and consequences. Where home building compensation cover is required, verify the certificate as described in the budgeting section before payment or commencement.
Ask the builder to identify the warranties applying to the work, products and systems, then verify the current statutory warranty information independently through official NSW consumer guidance. Record warranty periods, responsible entities, required maintenance and claim procedures in the handover file. Product warranties should not be represented as replacing statutory rights.
At handover, obtain approved plans, certificates, inspection records, warranties, manuals, keys and evidence that defects identified under the contract have been addressed. Compare total delivered scope and risk allocation rather than choosing solely by the lowest headline quotation.
Planning and feasibility checklist
- Confirm the address, lot and deposited plan.
- Verify the responsible council and lawful principal dwelling.
- Obtain the title, survey and existing approval records.
- Check zoning and mapped controls in the Spatial Viewer.
- Identify the current state and local planning instruments.
- Investigate easements, restrictions, access and services.
- Verify property-specific constraints through official records.
- Define the proposal as internal, attached, detached or converted.
- Test the available approval pathways with council or a registered certifier.
- Confirm applicable design standards and BASIX classification.
- Obtain required reports, fee advice and contribution information.
- Prepare coordinated documents and a complete project budget.
- Compare itemised quotes on an identical scope.
- Check licences, contract terms, warranties and HBC evidence.
- Obtain approval before starting work.
- Complete required inspections and certificate conditions.
- Obtain the occupation certificate before occupation or use.
- Establish the correct tenancy process before renting.