The early planning stage turns “we might build a granny flat” into a documented, testable project. It should establish the intended use, the legal and physical site facts, the likely approval pathway, major technical constraints, an initial design envelope and a budget range with explicit exclusions. It is not merely a sales meeting or a quick sketch in the backyard.
A sound outcome is not always “proceed”. It may be proceed, proceed after specified evidence, redesign, or do not proceed on the current basis. Discovering a serious constraint before detailed design, procurement or a building contract is useful project work, even when it changes the preferred idea.
Jurisdiction and currency note — 11 September 2026: This article provides general Australian information using NSW as the main worked example. Planning definitions, development standards, mapping, hazards, approval processes, building requirements, utility rules and consumer protections vary by state, territory, council, property and date. Verify current requirements with the responsible council or certifier and suitably qualified advisers. Nothing here guarantees approval, buildability, cost, timing, finance, rental performance, tax treatment or property value.
Stage 1: define the outcome before choosing a building
Begin with people and use, not a catalogue. Record who will occupy the building, whether the need is immediate or future, and what privacy, accessibility, care, storage, work, parking and outdoor-space requirements matter. Clarify whether the proposal is family accommodation, rental, a home office or another use because different questions may follow.
In NSW, official guidance treats a granny flat as a secondary dwelling established in conjunction with a principal dwelling on the same lot. The dwelling may be within, attached to or separate from the principal dwelling. That planning relationship should be tested before the owner assumes separate title, later subdivision or a particular rental strategy.
Prepare a one-page brief containing:
- intended occupants and use;
- essential rooms and approximate size;
- accessibility and ageing-in-place needs;
- relationship with the principal home;
- privacy, garden and parking priorities;
- target budget and funding constraints;
- desired timing and why it matters; and
- future uses that should be considered now.
Label every statement as required, preferred or optional. This helps later trade-offs remain aligned with the project’s purpose.
Stage 2: establish the legal property record
Planning starts with the correct land parcel. Gather current title and deposited-plan information, an appropriate survey, easements and restrictions, existing approvals, occupation certificates and approved plans for buildings already on the site.
In NSW, a section 10.7 planning certificate provides council-issued information about zoning, state, regional and local planning controls and specified constraints. The Planning Portal explains that a section 10.7(2) certificate and a combined section 10.7(2) and (5) certificate contain different levels of information. Ask the council or adviser which is appropriate; do not treat either as a complete feasibility determination.
Reconcile documents against reality. Is each existing structure shown on approved plans? Do surveyed boundaries match fences? Does access cross an easement? Record unexplained differences for investigation.
Stage 3: screen planning controls and choose a pathway
Use official planning information to identify zoning, relevant instruments, mapped constraints and possible approval routes. The NSW Spatial Viewer is useful for early screening, but a map layer is not a site approval and may not answer title, survey, infrastructure or detailed design questions.
NSW Planning says a secondary dwelling may be approved with consent or as complying development when the applicable requirements are met. Its guidance identifies requirements involving matters such as lot area and floor area and directs applicants to the current Housing SEPP. Complying development remains an approval process: every relevant eligibility requirement, development standard and exclusion must be satisfied before a council or registered certifier can issue a certificate.
If complying development is unavailable, that does not automatically mean the project is prohibited. A development application may be possible, subject to permissibility, local controls and merit assessment. Conversely, finding one favourable rule does not establish approval. The early-planning deliverable should name the likely pathway, the evidence supporting it and any unresolved qualification.
Use current consolidated legislation rather than an old checklist. Record the title, provision, access date and interpreter.
Stage 4: investigate the physical site
A survey and site inspection should support the design envelope. Record boundaries, levels, the principal dwelling, other structures, retaining walls, significant trees, drainage paths, visible services, driveways and usable outdoor areas.
Then investigate matters that are not obvious from the surface:
- sewer, water, stormwater, electricity, gas and communications infrastructure;
- easements and authority assets;
- soil, fill and likely footing conditions;
- flooding, overland flow, coastal or geotechnical risks;
- bushfire-prone land and vegetation;
- heritage, biodiversity or contamination triggers;
- privacy and overlooking relationships;
- solar access and overshadowing;
- construction access, crane or pump locations; and
- safe separation between occupants and building work.
The investigation should be proportionate. Not every site needs every consultant, but each trigger needs an owner and next action. NSW RFS mapping helps identify bush fire prone land, while Sydney Water publishes requirements for building near its assets. Each may indicate a need for specialist or authority input.
Stage 5: test services and water early
Service assumptions can reshape both footprint and cost. Ask where the proposed dwelling will connect, whether capacity is available, who owns the asset, what approvals apply and how maintenance access will be retained.
Trace stormwater from roof to lawful discharge, considering existing site levels and downstream constraints. “Connect to existing” is not a complete scope unless the connection point, condition, capacity and work required are known. The same applies to sewer depth, electrical supply, metering and hot-water location.
Do not place a preferred footprint over an assumed pipe corridor. Obtain records, verify critical locations and coordinate the response before design freeze.
Stage 6: develop options, not a single sales sketch
Prepare at least two concept responses where the site allows it. Each should show the principal home, proposed dwelling, access, private open space, services, trees, parking impacts, setbacks and important levels.
Assess each option against the brief. A smaller footprint may preserve access but compromise accessibility. A rear location may improve privacy but increase service runs and cost.
The concept should be detailed enough to expose decisions, but not presented as approved or fixed. Mark assumptions directly on drawings. Record which measurements come from survey and which remain approximate.
Stage 7: coordinate technical and sustainability requirements
Planning permission and technical building compliance are related but distinct. The Australian Building Codes Board advises homeowners that approvals, licensing and consumer protections operate through state and territory systems, while the NCC is adopted through those systems.
In NSW, BASIX addresses water, energy use and thermal performance for relevant residential development. Early orientation, glazing, shading, insulation, hot water and landscape decisions can affect both compliance and everyday comfort. Treat BASIX commitments as design inputs, not paperwork added after selections are made.
Identify likely requirements for structure, drainage, fire safety, waterproofing, ventilation, acoustics, termite management and accessibility. Confirm which professionals will prepare, certify and coordinate each component.
Stage 8: create a realistic early budget and programme
An early budget is a range based on a stated scope, not a promise. Separate the building from site works, utility connections, consultant fees, application and authority charges, surveys, reports, demolition, tree work, retaining, driveways, landscaping, contingencies and temporary accommodation or access measures.
Show allowances and exclusions. Ask what would cause each allowance to change and when better evidence will be available. Include a contingency appropriate to the unresolved risks rather than using it to hide missing scope.
The programme should include investigation, design, consultant coordination, approval, tender review, contract preparation, procurement, construction, inspections and occupation requirements. Do not advertise a construction duration as the entire project timeline.
The early-planning evidence pack
Before committing to detailed design or a build contract, aim to hold:
- a signed-off project brief;
- legal property and available approval records;
- a suitable survey;
- current planning and constraint information;
- a written preliminary pathway assessment;
- utility and drainage findings;
- site photographs and access measurements;
- concept options with assumptions marked;
- a consultant and authority action list;
- an inclusions, exclusions and responsibility schedule;
- an early budget range with contingency; and
- a decision register showing what is known, assumed and unresolved.
Evidence should be dated and traceable. A verbal comment can guide an enquiry, but it should not unlock substantial expenditure where a written determination, report or approval is needed.
Red flags and questions
Pause if:
- a fixed price is offered before major site and service assumptions are stated;
- a pathway is called “automatic” without a property-specific assessment;
- the concept uses fence lines as confirmed boundaries;
- existing structures or approvals are ignored;
- drainage is deferred until construction;
- mapped hazards are dismissed without competent review;
- the same person claims to answer planning, engineering, tax and valuation questions;
- exclusions are scattered across brochures and emails; or
- the proposed use differs from the use shown in the approval documents.
Ask:
- Which facts are verified, and which are assumptions?
- What evidence could make the preferred option unworkable?
- Who determines the planning pathway and building classification?
- Which site constraints could change the footprint?
- Where will each service connect, and who has confirmed it?
- What is excluded from the budget?
- What must be resolved before design freeze, contract and construction?
- What certificates will be required before occupation?
AMESCORP disclosure and next step
AMESCORP provides commercial granny-flat feasibility, design and delivery assistance. It may coordinate early investigations and translate findings into a project brief, concept and proposed scope. AMESCORP does not replace the council, registered certifier, utility authority, engineer, surveyor, lender, valuer, tax adviser, lawyer or insurer. Its advice or quotation cannot guarantee approval, construction cost, timing, rental income or value.
A useful first engagement asks for a written early-planning findings report: intended use, site facts, likely pathway, concept assumptions, required consultants, key exclusions, budget range, risks and the next evidence gate. Proceed only when the information is sufficient for the size and consequence of the next commitment.
Official-source map
- NSW secondary dwellings: current state guidance on secondary-dwelling pathways.
- Housing SEPP: current statutory housing provisions.
- Codes SEPP: exempt and complying-development provisions.
- NSW Spatial Viewer: preliminary planning-map research.
- Section 10.7 Planning Certificate Service: council-issued zoning and constraint information.
- BASIX: NSW residential water, energy and thermal-performance requirements.
- Bush fire prone land: NSW RFS hazard identification guidance.
- Sydney Water building near assets: authority requirements affecting asset proximity.
- ABCB homeowner information: the relationship between the NCC and jurisdictional approvals.
- Building or renovating a home: NSW consumer and project guidance.
Reviewed official sources
These are the first-party and authoritative references reviewed for this article.
- Secondary dwellings — NSW Department of Planning, Housing and Infrastructure; accessed 2026-09-11.
- State Environmental Planning Policy (Housing) 2021 — NSW legislation; accessed 2026-09-11.
- State Environmental Planning Policy (Exempt and Complying Development Codes) 2008 — NSW legislation; accessed 2026-09-11.
- NSW Planning Portal Spatial Viewer — NSW Planning Portal; accessed 2026-09-11.
- Online Section 10.7 Planning Certificate Service — NSW Planning Portal; accessed 2026-09-11.
- BASIX — NSW Planning Portal; accessed 2026-09-11.
- Bush fire prone land — NSW Rural Fire Service; accessed 2026-09-11.
- Building over or next to assets — Sydney Water; accessed 2026-09-11.
- Homeowner information — Australian Building Codes Board; accessed 2026-09-11.
- Building or renovating a home — NSW Government and NSW Fair Trading; accessed 2026-09-11.