A secondary dwelling, commonly called a granny flat, is a self-contained home established with a principal dwelling on the same lot. This guide separates the limited verified statistical facts about Cunjurong Point from statewide planning guidance. Any proposal must be investigated against the legal parcel, current planning instruments, title, services, design and intended use before commitments are made.
AMESCorp commercial disclosure and privacy warning: AMESCorp is a commercial service provider promoted by this website and may benefit from enquiries or purchases. Independently verify its scope, advice, pricing and commercial interests. Do not send personal, financial, identity or property documents through an unsecured channel. No guarantees are provided.
Local granny-flat overview
The official planning term is secondary dwelling; “granny flat” is generic reader and search language. The NSW Government’s secondary-dwelling guidance defines it as self-contained accommodation established in conjunction with a principal dwelling on the same site. It may be within, attached to or separate from that dwelling. Classification depends on the approved use and documents, not the building’s appearance, sales description or prefabricated construction method.
Both dwellings remain on the same lot under this framework. A secondary dwelling is not thereby separately subdividable, titled or saleable. A project designed around separate ownership may be another development type and needs advice under the controls applying to that classification.
The canonical locality record identifies Cunjurong Point as ABS locality code SAL 11164, covering approximately 1.5861 square kilometres across 10 mesh blocks. SAL means the Australian Bureau of Statistics Suburbs and Localities geography. SAL boundaries are statistical approximations and should not be confused with cadastral boundaries, legal parcels or Statistical Area Level 1 (SA1).
The record shows the Cunjurong Point SAL overlapping the ABS statistical LGA named Shoalhaven. That name is distinct from the formal council organisation name Shoalhaven City Council. The overlap is useful routing context only: it does not prove which council administers a particular title or which controls apply to it. Confirm the address, lot and deposited plan against current cadastral and council records before using local material.
The 2021 Census QuickStats for Cunjurong Point recorded 111 people, a median age of 60 and 171 private dwellings. These are historical results from the 2021 Census, not current population, occupancy or property-market measures. The small population also makes broad demographic, housing-demand or investment conclusions unsafe. Census statistics cannot establish planning rights, current dwelling use or demand for a proposed secondary dwelling.
Those figures provide the available locality-specific Census context, but little else in the verified evidence describes Cunjurong Point at a planning-property level. There is no verified basis here for claiming that local lots share a particular zone, size, hazard profile, service arrangement or development capacity. Property searches must therefore begin with the exact address and legal parcel rather than an assumed suburb-wide pattern.
For a parcel confirmed as being administered by Shoalhaven City Council, the council’s Local Environmental Plan information and online mapping tools are starting points. Their applicability remains conditional on verifying the legal parcel, current instrument and mapped controls.
Council rules and approval pathway
State 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 or non-residential land must be checked against its local environmental plan rather than assessed using residential-zone assumptions.
There are two potential assessment pathways:
- A development application (DA) is assessed by the responsible council against relevant environmental planning instruments, local controls, the site’s characteristics and other statutory considerations. NSW guidance states that DAs are lodged online through the NSW Planning Portal.
- A complying development certificate (CDC) may be issued by a council or appropriately registered certifier only when the land and proposal meet every applicable requirement. The official complying-development guidance describes this as a standards-based pathway; a certifier cannot waive a standard or mapped exclusion.
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 bounded CDC requirement, not a universal DA minimum or evidence that a property qualifies. The full proposal must be tested 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.
Those instruments contain site, floor-area and development controls. The applicable limits for height, setbacks, landscaping, site coverage, earthworks and related matters depend on the parcel and pathway, so they should be read from the current provisions rather than copied from another project. The Housing SEPP does not itself require extra parking for a secondary dwelling, but existing consent conditions, the loss of approved parking, driveway design, access and vehicle crossings still require review.
Parcel verification should cover the current zone, local environmental plan, development control plan, Housing SEPP, Codes SEPP and any site-specific instrument. Obtain the title and deposited plan and investigate easements, covenants, restrictions, legal access, sewer and drainage assets, utilities and lawful approvals for existing buildings. Planning consent does not necessarily displace private title restrictions.
Use the NSW Planning Portal Spatial Viewer to screen mapped controls. Then investigate only the matters relevant to the address, which may include heritage, bushfire, flooding, biodiversity, coastal hazards, acid sulfate soils, contamination or other overlays. Confirm council or authority requirements for stormwater, wastewater, water, waste, driveways, construction access, application documents, fees, contributions and referrals.
Planning instruments, maps, fee schedules and application requirements can change. Before relying on an earlier feasibility assessment, record the instrument versions and map results checked for the parcel, then have the responsible council or registered certifier confirm the proposed pathway. This is particularly important where the design, existing structures or intended use has changed since the original search.
After approval, follow the approved plans, conditions, certification arrangements and required inspections. A concept plan, quotation, BASIX certificate or builder’s opinion is not a DA consent or CDC. Service NSW explains that an occupation certificate is required to occupy or use a new building, or to use an existing building after an approved change of use. Establish the inspection and handover requirements with the certifier before construction starts.
Costs and budgeting
No verified Cunjurong Point build price or current parcel-specific fee assessment supports a meaningful locality estimate. Prepare a complete feasibility budget from investigations, official fee advice and itemised quotations instead of treating an advertised building package as the total project cost.
Allow for:
- title records, survey, service searches and planning investigations;
- design, engineering, BASIX work and specialist reports;
- application, certifier, inspection and authority charges;
- council contributions where the verified proposal attracts them;
- demolition, excavation, retaining and site preparation;
- construction, fixtures, finishes and appliances;
- sewer or wastewater, stormwater, water, power and communications;
- access, paths, fencing, waste storage and other external works;
- certificates, insurance and handover requirements; and
- an owner-determined contingency based on documented unresolved risks.
Slope, access, ground conditions, service distances, drainage, trees, mapped constraints, finish choices and changes to an existing building can materially alter the scope. A garage, shed or studio conversion may require structural, fire-safety, moisture, insulation, ventilation, window and servicing work. Check its approval history and condition before assuming conversion is economical or lawful.
Issue each tenderer with the same drawings and written scope. Compare exclusions, provisional sums, prime-cost items, site assumptions, connection work, taxes, external works, approval responsibilities and handover documents. Obtain current written fee and contribution advice from the responsible bodies once the proposal is defined.
Building Commission NSW contract guidance requires a written residential building contract for work costing more than $5,000. More extensive large-job contract requirements apply above $20,000, and the maximum deposit is 10%. Read the current Consumer Building Guide and contract material before signing.
Home building compensation cover applies to relevant residential building work valued at $20,000 or more, including GST. Before paying money or permitting work to begin, use the official HBC Check to verify the project-specific certificate and confirm the owner, site, builder and work details.
Design and site considerations
Begin design with a current survey and verified property information. Plot boundaries, levels, the principal dwelling, existing structures, access, trees, private open space and known services. Record whether the proposal is internal, attached, separate or a conversion because that decision affects planning, BASIX, construction and certification work.
Test siting against privacy, overlooking, daylight, ventilation and noise for both homes and adjoining properties. Plan practical pedestrian access, waste-bin movement, clothes drying, deliveries and maintenance. Where occupants share a driveway, garden or utility area, the drawings should show how circulation and everyday use will work without relying on informal assumptions.
Locate stormwater infrastructure, sewer or wastewater systems, water, electricity and communications before fixing the footprint. Check whether works would cross easements or affect authority assets. Confirm connection points, asset-protection requirements, legal access and discharge arrangements with the relevant authority. These findings should be incorporated into the design and tender documents.
Apply the design controls identified for the verified pathway rather than using dimensions from another council, an old instrument or a different development type. If an existing structure is involved, obtain approval records and have its condition assessed. Physical space or a builder’s willingness to convert it does not establish approval for habitation. Modular, prefabricated or relocatable construction remains subject to applicable planning, building and certification requirements.
BASIX addresses water, energy use and thermal performance for applicable residential development. Integrate its commitments into orientation, glazing, shading, insulation, ventilation, hot-water choices and water measures before the documentation is priced. The Planning Portal’s secondary-dwelling BASIX project guidance distinguishes conversions, new attached or separate work, and projects containing new principal and secondary dwellings. Select the classification matching the actual approved scope.
Also discuss step-free entry, circulation, bathroom usability, lighting and maintainable materials with the designer. These measures can improve long-term utility, but the applicable accessibility requirements must be determined for the project rather than assumed from general design preferences.
Rental and investment considerations
Establish lawful development and occupation status before preparing a rental plan. Check that both dwellings have the necessary approvals, completed work matches the approved plans and the required occupation certificate has been issued. Keep those records available for insurance, management and future property due diligence.
If the secondary dwelling will be rented under a residential tenancy, use the current NSW Fair Trading guidance on residential tenancy agreements. Relevant rights and duties arise under the Residential Tenancies Act 2010, including requirements associated with standard terms and the landlord–tenant relationship. Family occupation, a licence, boarder arrangements and short-term accommodation should not automatically be treated as equivalent to a standard residential tenancy.
Plan for separate access, privacy, noise, parking, mail, waste, clothes drying and maintenance access. Document responsibility for gardens and shared areas. Where services are shared, obtain advice about metering, billing and lawful recovery of charges, then state the agreed arrangements clearly in the tenancy documents.
Use recent, genuinely comparable local evidence when considering achievable rent. Comparisons should concern lawfully occupied accommodation with similar size, condition, inclusions and location; online asking prices do not show an achieved result. Build the assessment around operating expenses, vacancy, repairs, management, insurance, utilities and future compliance work.
Before committing, ask the financier how the proposal is treated for lending and valuation, the insurer how both construction and rental use affect cover, and a registered tax adviser about the owner’s circumstances. A property manager or NSW Fair Trading can help establish compliant tenancy processes and record keeping.
Choosing a granny-flat builder
Clarify the design, approval responsibilities and site information before seeking final tenders. Use the Service NSW builder and tradesperson licence check to verify the contractor’s exact legal entity, licence number, status and category. Ensure the licensed name matches the quotation and contract. An ABN, association membership, display project or review score is not a substitute for this check.
Request recent references for comparable secondary dwellings and, where possible, inspect completed work. Ask previous clients about communication, site management, variations, defects and post-completion service. Check whether the builder has dealt with the construction system, access conditions, service work and conversion issues relevant to the verified site.
Compare tenders for:
- demolition, excavation, retaining and site works;
- stormwater, utilities, service connections and external works;
- fixtures, finishes, appliances and provisional sums;
- design, approval, consultant and certifier responsibilities;
- approved-plan and BASIX compliance;
- hidden-condition and existing-structure assumptions;
- variation and extension-of-time procedures;
- progress stages, defects and handover documents; and
- contractual warranties and applicable statutory warranty information.
Ask the builder to identify every exclusion and assumption in writing. The contract should allocate responsibility if approval conditions, engineering details or authority requirements change the scope. Do not accept an unverified claim that the project qualifies for a particular approval pathway.
Use the appropriate written contract, read the Consumer Building Guide and obtain legal advice where responsibilities or risk allocations are unclear. Keep progress payments aligned with completed contractual stages, document approved variations and retain approvals, certificates, invoices and correspondence. Verify which statutory warranties apply to the work, what the contract says about defects and warranties, and the current information supplied through official consumer-protection material.
Complete the project-specific home building compensation check described in the budgeting section before payment or commencement where cover is required. At handover, collect approved plans, certificates, warranties, manuals, inspection records, keys and evidence needed for the occupation certificate and future maintenance.
Planning and feasibility checklist
- Confirm the address, lot/DP, title and lawful principal dwelling.
- Verify the administering council from parcel records.
- Check zoning and mapped controls in official viewers.
- Read the applicable LEP, DCP and state instruments.
- Obtain title, survey, easement and service information.
- Investigate relevant property-specific constraints.
- Define the internal, attached, separate or conversion scope.
- Test DA and CDC pathways with council or a registered certifier.
- Confirm design controls, BASIX classification and required reports.
- Obtain current fee, contribution and authority advice.
- Prepare a complete budget and compare matched tenders.
- Verify licences, contract protections, warranties and HBC cover.
- Secure approval before starting work.
- Follow certification and inspection requirements.
- Obtain the occupation certificate before occupation or use.
- Establish compliant tenancy documents if renting.