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 comes from the approved use and documents, not its appearance or marketing description.
This guide combines the limited verified statistical context available for Craven with statewide planning and consumer guidance. It cannot establish what is permitted on a particular parcel. The address, lot and deposited plan, title, responsible council, zoning, approval history, mapped controls and servicing conditions must be checked before a design or quotation is relied upon.
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Local granny-flat overview
Craven is identified in the canonical locality record as Australian Bureau of Statistics SAL code 11107. SAL means the ABS Suburbs and Localities geography. SAL boundaries represent statistical approximations of commonly recognised localities; they are not cadastral boundaries, planning zones or legal property descriptions. SAL must not be confused with SA1 or expanded as Statistical Area Level 1.
The supplied record gives Craven a statistical area of approximately 94.7057 square kilometres across four mesh blocks. It also records the SAL area as overlapping the ABS statistical LGA named Mid-Coast. That ABS LGA label is distinct from the formal local-government organisation name MidCoast Council. The overlap is useful geographic context, but it does not prove that MidCoast Council is responsible for an individual parcel or is the relevant consent authority. Confirm the parcel and current boundary through official property and planning systems before using the council’s material.
The 2021 Census Craven QuickStats reported 104 people, a median age of 54 and 58 private dwellings. These are historical values from the 2021 Census edition, not current population, household or property-market measures. The small reported population also makes broad demographic, housing-demand or market conclusions unsafe. The figures provide locality context only and say nothing about planning rights at an address.
Under the statewide secondary-dwelling guidance, a secondary dwelling must be associated with a principal dwelling on the same site. Both remain on one lot under this planning classification. The secondary-dwelling pathway does not create a separately subdividable, separately titled or independently saleable residence.
State guidance identifies residential zones R1, R2, R3, R4 and R5 as zones in which secondary dwellings are permitted. A local environmental plan may permit them in other zones. Permissibility is only an initial planning question: it does not establish approval eligibility, and residential-zone guidance must not be transferred to rural or non-residential land. Some local environmental plans include special rural provisions, so the instrument applying to the legal parcel must be read directly.
The proposed form must also be defined accurately. Internal, attached and separate secondary dwellings can require different documentation. A garage, shed, studio or other existing structure does not become lawful accommodation because it appears suitable for conversion. Its approval history, current authorised use, structural condition and any change-of-use requirements need investigation.
There is little verified locality-specific planning evidence for Craven beyond the statistical record and council-overlap context. Accordingly, this guide does not claim common zoning, lot characteristics, services, hazards, lifestyle attributes or development potential across the locality.
Council rules and approval pathway
A secondary dwelling may proceed through a development application or, if every applicable requirement is satisfied, as complying development. A development application is assessed by the responsible council against the relevant planning instruments, controls and site impacts. A complying development certificate may be issued by the council or an appropriately registered certifier through a standards-based process. The NSW complying-development guidance explains that the approval remains subject to prescribed requirements and conditions; a certifier cannot waive an exclusion or development standard.
For the Housing SEPP complying-development pathway, official 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 eligibility test, not a universal minimum for a council-assessed application and not sufficient by itself. Eligibility must be tested under the current State Environmental Planning Policy (Housing) 2021, including Schedule 1, the Codes SEPP, mapped exclusions and all property-specific requirements.
The Housing SEPP contains site and floor-area controls. The applicable floor area, setbacks, height, landscaped area, site coverage and earthworks provisions must be obtained from the current instrument and the actual approval pathway. Figures from an older policy, another council area or another development type should not be reused. State guidance says the Housing SEPP does not itself require extra parking for a secondary dwelling, but existing approval conditions, loss of approved parking, access design, driveway safety and vehicle-crossing requirements may still matter.
Start parcel verification with the NSW Planning Portal Spatial Viewer, then check the current local environmental plan, development control plan, Housing SEPP, Codes SEPP and any site-specific instrument. If the parcel is confirmed within MidCoast Council’s authority, use the council’s planning framework, development gateway and development-application process. Their applicability remains conditional on confirming the legal parcel and responsible authority.
A complete pathway assessment should establish:
- the lot and deposited plan, title arrangement and lawful principal dwelling;
- zoning, permissible use and applicable planning instruments;
- title restrictions, covenants, easements and legal access;
- boundaries, encroachments, sewer, drainage and utility locations;
- the approval status of structures proposed for retention or conversion;
- relevant mapped or property-specific constraints identified through official evidence; and
- current council or authority requirements for submissions, waste, stormwater, servicing, contributions, driveways and vehicle crossings.
Possible mapping topics can include heritage, bushfire, flooding, biodiversity, coastal hazards, acid sulfate soils, contamination and mine subsidence. This is not a claim that any applies in Craven. Investigate only those indicated for the address. Planning approval may not override private title restrictions, and a concept plan, quotation, BASIX certificate or builder statement is not development approval.
After approval, the project may require construction certification, prescribed inspections and evidence that approval conditions have been met. 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 an approved changed purpose. Confirm the required certification sequence with the appointed certifier.
Costs and budgeting
No verified Craven construction rate, council fee, contribution or utility allowance is available in the supplied evidence. Build the budget from a surveyed site, a defined approval pathway and consistent project documents rather than an advertised package price. Obtain itemised, like-for-like quotations that state assumptions and exclusions.
Allow separate budget headings for:
- title, survey, service-location and preliminary investigation work;
- design, engineering and specialist reports required by the site;
- application, Planning Portal, council and certifier charges;
- contributions where an applicable plan requires them;
- demolition, excavation, retaining, spoil removal and site preparation;
- building work, fixtures, finishes and documented BASIX commitments;
- water, sewer, electricity, telecommunications and drainage connections;
- paths, access, fencing, landscaping and other external work;
- inspections, certificates, insurance and handover documents; and
- a project-specific contingency reflecting unresolved scope or site risks.
Cost can change materially with slope, ground conditions, restricted access, service distance or capacity, drainage, tree impacts, hazardous materials, existing structures and finish selections. Conversion work may need structural upgrading, waterproofing, insulation, fire-safety work, ventilation and new services. It should not be treated as inherently cheaper until the existing building and approval history are assessed.
Require quotes to identify responsibility for design, applications, engineering, BASIX, authority approvals, certifier liaison, inspections and occupation-certificate documentation. Check whether excavation, service upgrades, stormwater work, floor finishes, painting, external works and waste removal are included. Verify current fees with the responsible organisation for the defined proposal.
The current Building Commission NSW contract guidance states that residential building work costing more than $5,000 requires a written contract, and work costing more than $20,000 requires the more extensive large-job contract. It also states that the maximum deposit is 10 per cent. Read the current Consumer Building Guide and align progress payments with completed work.
Home building compensation cover is required for applicable residential building work valued at $20,000 or more, including GST. Obtain the project-specific certificate and verify it through the official HBC Check before making a payment where cover is required. Recheck these consumer requirements when contracting because official rules may change.
Design and site considerations
Begin design after the parcel, survey, planning pathway and approval status of existing structures are understood. Test how the secondary dwelling will function with the principal dwelling, including access, privacy, overlooking, daylight, ventilation, noise transfer, private open space, waste storage, clothes drying and maintenance access. A plan that fits geometrically can still create poor amenity or impractical circulation.
Use the controls verified through the pathway assessment above when resolving the building envelope. Internal, attached, separate and conversion projects can raise different structural, fire-safety and documentation issues. Prefabricated, modular or relocatable construction does not avoid planning, building, BASIX or certification requirements.
Locate sewer, drainage, water, electricity and telecommunications infrastructure early. Confirm lawful connection points, authority protection requirements and available capacity. Identify easements and restrictions before positioning foundations. Stormwater needs an approved disposal strategy suited to the property; an informal outlet or discharge toward neighbouring land should not be assumed acceptable. Where on-site wastewater is involved, obtain advice on the existing approval, system capacity and land-application requirements.
Use official mapping to decide whether property-specific investigations are required, rather than applying a generic constraint inventory. A mapped result may affect the approval pathway, require a specialist report or change the design. A current survey and title search are separate checks because planning maps may not disclose boundaries, encroachments or private restrictions with the precision needed for design.
BASIX should shape the concept rather than be added after plans are complete. The Planning Portal BASIX guidance covers water, energy use and thermal performance. Its secondary-dwelling project guidance distinguishes conversions, new attached or separate work, and projects containing new principal and secondary dwellings together. Select the classification that matches the approved scope and carry the certificate commitments into specifications, construction and final documentation.
Design documentation should clearly allocate responsibility for engineering, service design, waterproofing, energy commitments, authority conditions and inspections. If the proposal changes during procurement or construction, have the designer and certifier assess whether amended approval or certification documents are needed before the change is implemented.
Rental and investment considerations
Consider rental use only after confirming lawful approval and obtaining the certification needed for occupation. Retain the approval, stamped plans, BASIX certificate, inspection records, warranties and occupation certificate. These documents help establish the authorised use and inform future maintenance, insurance and property management.
If the approved secondary dwelling is rented under a residential tenancy, current NSW Fair Trading tenancy guidance and the Residential Tenancies Act 2010 apply. Use the current standard agreement and follow the applicable requirements for information disclosure, bonds, condition reports, repairs, safety, access and ending a tenancy.
Family occupation, a licence, short-term accommodation, room letting and a standard residential tenancy are not necessarily treated alike. Check the approved use and obtain advice for the intended arrangement rather than assuming tenancy documents resolve planning questions.
Plan the relationship between occupants of both dwellings. Relevant matters include private access, outdoor space, mail, bins, noise, maintenance access and emergency contact arrangements. Establish how electricity, water, internet and other services will be supplied and charged. Any metering arrangement should be checked against authority requirements, tenancy law and the actual service design.
The 2021 Census data is not evidence of current rental demand or achievable rent. No verified current Craven rental series has been supplied, so a feasibility assessment should use recent comparable evidence and distinguish advertised asking prices from completed transactions. Obtain advice suited to the owner’s circumstances on lending, insurance, taxation, legal obligations and property management. Include ongoing maintenance, compliance, management and vacancy assumptions in the assessment rather than considering only construction expenditure.
Choosing a granny-flat builder
Complete enough planning and site investigation to give each tenderer the same realistic scope. Identify the legal entity proposed as the contracting party, then use the official builder and tradesperson licence check to verify its current licence status, category and conditions. An ABN, association membership, online review or salesperson’s statement is not a substitute for the register check.
Seek recent references for comparable secondary dwellings, approval pathways, site access and service conditions. Inspect completed work where practical and ask previous clients about communication, variations, defects and handover. References supplement rather than replace licence, contract and insurance verification.
Issue consistent drawings, specifications, survey information and reports to each tenderer. Compare:
- the contracting entity and nominated licensed supervisor;
- inclusions, exclusions, provisional sums and prime-cost items;
- excavation, retaining, spoil removal and access assumptions;
- service connections, upgrades and stormwater work;
- responsibility for approvals, BASIX, engineering and certification;
- implementation of approval conditions and BASIX commitments;
- variation procedures, progress stages and delay provisions;
- defect rectification, handover records and manufacturer warranties; and
- responsibility for inspections and occupation-certificate evidence.
Use the appropriate written contract and read the Consumer Building Guide linked from the official contract guidance. Do not sign documents containing blank sections or rely on verbal promises. Check how the contract addresses variations, extensions of time, progress payments, defects, termination and dispute procedures. Independently verify the current statutory warranty information applicable to the work, including the warranty periods and how the contract records those obligations.
Where home building compensation cover applies, check that the certificate identifies the correct property, builder and project before payment. Keep copies of the verified certificate, contract, approved plans, variations, invoices, inspection records and correspondence. Before final payment, inspect the work, document unresolved defects, collect warranties and certificates, and confirm that the required handover and occupation documentation has been provided.
Planning and feasibility checklist
- Confirm the address, lot, deposited plan, title and responsible council.
- Obtain the principal dwelling and existing-structure approval records.
- Check zoning and mapped controls in the Spatial Viewer.
- Review the current applicable planning instruments and council requirements.
- Order a title search, survey and service-location information.
- Investigate easements, restrictions, access, drainage and relevant mapped constraints.
- Define the proposal as internal, attached, separate or conversion work.
- Test both approval pathways with council or a registered certifier.
- Confirm BASIX, reports, application documents, fees and contributions.
- Compare itemised quotations on a consistent scope.
- Verify licences, contract terms, statutory warranties and HBC cover.
- Obtain approval before starting work.
- Complete required inspections and approval conditions.
- Obtain the occupation certificate before occupation or use.
- Use current Fair Trading documents for any residential tenancy.