Melbourne Overshadowing Rules: 5 Hours, 3 Shadow Times, Fewer Delays
If you’re planning an extension or new build in Melbourne, the ResCode standard that matters most is the five hour sunlight test applied to shadow diagrams drawn for 9am, 12pm and 3pm on 22 September. You’ll need accurate shadow diagrams, a check against Clause 54 and Clause 55 standards, and, if your neighbour has rooftop solar panels, a written statement explaining how you’ll limit the impact. Get these three things right early and you avoid the redesign cycle that stalls so many permit applications.
TL;DR:
The test protects the lesser of 75% or 40 square metres of secluded space, with a three metre minimum dimension; existing sunlight shortfalls cannot worsen.
Show existing and proposed shadows together, and check local council rules because some councils require additional diagrams at 10am and 2pm.
For neighboring rooftop solar, diagrams should show panel shading, while a written statement must describe mitigation and existing shade on the system.
Model panel impacts before floor plans are fixed; a greater boundary setback, lower upper storey, or changed orientation can reduce shading.
Missing a numerical standard does not automatically mean refusal; an alternative design may succeed if accurate survey evidence shows the sunlight objective remains met.
Table of Contents
What overshadowing is and which Victorian standards you must know
Shadow diagrams: required times, what they must show and how to read them
How the rules now protect domestic rooftop solar and what to include in your application
How councils judge ‘unreasonable’ overshadowing and when an alternative design solution is accepted
Permit checklist: drawings, statements and common extras councils ask for
Practical steps for homeowners in Melbourne: who to engage and the typical workflow
Common exemptions and exceptions to overshadowing rules in Melbourne
Examples of overshadowing impacts on neighbouring properties and community
Step-by-step process to request a planning permit variation or appeal overshadowing decisions
Council-specific overshadowing guidelines and where to find them
Yorcon’s perspective: how we design to avoid overshadowing delays and protect solar access
How Yorcon can help: permit-ready designs and project management
What overshadowing is and which Victorian standards you must know
In planning terms, overshadowing means the shadow cast by a new building or extension falls across a neighbouring property’s secluded private open space or habitable room windows, cutting into the sunlight they currently enjoy. Victorian planning schemes deal with this through Clause 54 (for single dwellings) and Clause 55 (for multi dwelling developments), with the detailed rules sitting inside the standards and objectives of PPN27.
The standards you’ll see referenced on council documents are:
A14/B21: the overshadowing open space standard, requiring that secluded private open space retains sunlight access.
A15/B22: the daylight to existing windows standard, protecting habitable room windows on adjoining properties.
55.05-2: the broader objective clause assessors cite when weighing up acceptability.
The practical test behind A14/B21 is specific: at least 75% or 40 square metres of secluded private open space, whichever is less, with a minimum dimension of 3 metres, should receive five hours of sunlight between 9am and 3pm on 22 September. If that space already gets less sunlight than this, your design can’t reduce it any further.
Shadow diagrams: required times, what they must show and how to read them
Every planning assessor in Melbourne will ask for shadow diagrams drawn for three fixed moments on the one calendar day. That day is 22 September, the spring equinox, chosen because it gives a consistent mid point reading that neither favours the long shadows of winter nor the short shadows of summer.
The diagrams must show shadows at:
9am
12pm
3pm
Each diagram needs to show both the existing shadow (cast by what’s there now) and the proposed shadow (cast by your extension or new build), overlaid so an assessor can see exactly how much extra shadow lands on the neighbour’s secluded private open space or windows.
The sunlight access standard requires at least five hours of sunlight between 9am and 3pm on 22 September across 75% or 40 square metres of secluded private open space, whichever is less, with a minimum 3 metre dimension. This figure from PPN27 is the benchmark every shadow diagram gets measured against, and it’s worth checking your own diagrams against it before you lodge, not after a council planner sends them back.
A few diagram cues tend to raise flags for assessors: shadows that creep across more than a quarter of the secluded private open space at midday, a proposed shadow line that touches a habitable window that currently gets full sun, or a diagram that only shows the proposed design without the existing shadow for comparison. An accurate baseline survey that correctly maps existing shadows is essential, because the whole assessment hinges on the difference between what exists now and what you’re proposing.
How the rules now protect domestic rooftop solar and what to include in your application
Victorian planning rules now specifically require applicants to consider the impact of new overshadowing on a neighbour’s rooftop solar panels. This obligation applies to residential zones and Commercial 1 zones where an adjoining lot has a domestic rooftop solar energy system, which covers the overwhelming majority of Melbourne’s established suburbs.
If your project could shadow a neighbour’s panels, your application needs:
Shadow diagrams that clearly show the solar panels and how the proposed shadow falls across them.
A written statement outlining how you’ll mitigate the impact, whether through design changes, setbacks or orientation.
An honest account of existing overshadowing on that system, since assessors weigh proposed impact against what’s already there.
Pro Tip: Ask your designer to model panel shadow impact early, before floor plans are locked in: moving a roofline back half a metre at concept stage is far cheaper than redesigning after council raises concerns.
Design choices that reduce future shadow risk include setting upper storeys further back from the boundary facing the neighbour’s roof, keeping new structures lower where a northern aspect is involved, and orienting bulk away from the angle the sun takes over the solar array during the cooler months.
How councils judge ‘unreasonable’ overshadowing and when an alternative design solution is accepted
Meeting a numerical standard and meeting the underlying objective aren’t always the same thing, and this is where council discretion comes in. Clause 54 and Clause 55 set out both: a standard gives you a number to hit, but an objective describes the outcome the planning scheme is actually trying to protect, in this case reasonable sunlight access for neighbours.
Where your design can’t quite meet the numerical standard, you’re not automatically refused. Victorian planning schemes allow an alternative design solution, provided you can demonstrably show the objective is still met.
Present evidence that the objective (reasonable sunlight retention) is achieved even though the exact standard isn’t.
Reference the decision guidelines council will use to weigh your case, not just the raw shadow numbers.
Back every claim with an accurate baseline survey showing existing conditions aren’t being made worse.
A good alternative design solution argument demonstrates the objective is met rather than simply explaining why the number was missed, and that distinction shapes how a planner reads your whole application.
Permit checklist: drawings, statements and common extras councils ask for
A permit-ready submission anticipates overshadowing scrutiny rather than reacting to it after council comes back with questions. The core package most Melbourne councils expect includes:
Site plan showing boundaries, existing structures and the proposed footprint.
Elevations and floor plans detailing height, setbacks and bulk.
Shadow diagrams for 9am, 12pm and 3pm on 22 September, showing existing and proposed shadows.
A written overshadowing and solar statement, addressing both the secluded private open space test and any rooftop panels affected.
Beyond the core set, councils commonly ask for a current site survey, a tree protection plan if established vegetation sits near the works, and written responses to the relevant decision guidelines under Clause 54 or 55. Errors such as incorrect relative levels (RLs) or a missing shadow diagram are one of the most common reasons an application gets sent back for amendment, adding weeks to a process that could otherwise run smoothly.
Practical steps for homeowners in Melbourne: who to engage and the typical workflow
A sensible workflow saves you from discovering overshadowing problems after your drawings are finished rather than before.
Check your planning scheme and overlays on VicPlan first, since heritage, neighbourhood character or design and development overlays can add extra requirements on top of the standard overshadowing rules.
Commission a site survey so your baseline shadow data is accurate from day one.
Order shadow diagrams and designer drawings together, so the design responds to the shadow data rather than being tested against it afterwards.
Get pre-lodgement advice from council or a town planner if your site is tight or your neighbour’s solar panels are a factor.
Lodge your permit with the full documentation set, including the written overshadowing statement.
Neighbour concerns are easier to manage when you communicate before lodgement rather than after a council notice goes out. A short conversation showing your shadow diagrams can defuse objections that would otherwise turn into a formal submission.
Pro Tip: Bring a design and build manager into the process at concept stage, not after drawings are finished, so surveys, shadow diagrams and the written statement are coordinated from the outset rather than patched together under time pressure.
Common exemptions and exceptions to overshadowing rules in Melbourne
Not every structure in your backyard triggers the full overshadowing assessment. Small outbuildings below certain height and floor area thresholds, like a modest garden shed, can fall outside planning permit requirements altogether under Victoria’s exempt and as of right provisions, meaning the shadow standards never come into play for them.
Single storey extensions that stay well within existing setbacks and height limits sometimes avoid triggering a full Clause 54 assessment if they fall under a council’s VicSmart or code assessment pathway, though this depends heavily on your specific zone and any overlays affecting the property.
Properties where the secluded private open space already receives less than five hours of sunlight before any works happen sit in a different category too. Here, the rule isn’t that you must somehow create five hours of sun that never existed. It’s that your proposal can’t make the existing shortfall worse. This is a common point of confusion for homeowners who assume every property must hit the five hour benchmark outright.
Some councils also apply reduced scrutiny to rear boundary setbacks where no secluded private open space or habitable window exists on the affected side, since there’s nothing for the standard to protect in that direction. None of these exemptions remove the need for a shadow diagram if your council requests one, and checking with your specific council before assuming an exemption applies will save you a redesign later.
Examples of overshadowing impacts on neighbouring properties and community
A second storey addition built hard against a southern boundary is one of the most common overshadowing scenarios in Melbourne’s older suburbs, where narrow Victorian and Edwardian lots mean a new upper level can throw a long shadow across a neighbour’s courtyard for most of the cooler months. The neighbour’s vegetable garden or outdoor entertaining area, previously in full sun through the middle of the day, can lose several hours of light depending on the height and setback chosen.
Rooftop solar is where the impact is now most tangible for everyday households. A new two storey build next door can shade a neighbour’s panels during the exact hours they’d otherwise generate the most power, directly affecting the household’s energy bills rather than just their enjoyment of a sunny backyard.
Community scale impacts show up where multiple infill developments happen along the same street over several years. Each individual extension might comply with the standard on its own, but cumulative shadow across a row of narrow blocks can change how a whole streetscape feels, particularly in winter when sun angles are lowest. This is part of why councils look closely at existing conditions as well as the specific proposal in front of them, rather than assessing each application in total isolation.
Step-by-step process to request a planning permit variation or appeal overshadowing decisions
If your application is refused on overshadowing grounds, or council imposes conditions you believe go further than necessary, there’s a defined pathway to follow rather than starting again from scratch.
First, request a copy of council’s assessment and the specific decision guidelines cited in the refusal, so you understand precisely which standard or objective wasn’t satisfied. Second, work with your designer or planner to prepare a response, which may be a revised shadow diagram set, an amended design, or an alternative design solution argument showing the objective is still met even though the exact number wasn’t.
Third, if council remains unsatisfied, you can lodge an application for review with the Victorian Civil and Administrative Tribunal (VCAT), which hears disputes over planning permit refusals and conditions across Victoria. This involves submitting your case along with supporting evidence, typically including the original and any revised shadow diagrams, survey data and your written statement addressing overshadowing or solar impacts.
Fourth, be ready to engage in a mediation or compulsory conference, which VCAT often schedules before a formal hearing, giving both parties a chance to resolve the dispute without a full tribunal process. Many overshadowing disputes settle at this stage once both sides see the shadow modelling side by side.
Throughout any variation or appeal process, the same principle from the original assessment applies: a strong baseline survey and clear, accurate shadow diagrams carry more weight than argument alone.
How overshadowing rules interact with heritage overlay areas and implications for heritage home renovations
Heritage overlays add a layer of assessment on top of the standard overshadowing rules rather than replacing them. A Victorian terrace or Edwardian weatherboard sitting within a heritage overlay still needs to satisfy Clause 54 or 55’s sunlight standards for any rear extension or second storey addition, but council will also weigh the impact on the heritage streetscape and the building’s own significant fabric.
This dual assessment often pushes heritage renovations toward rear and lower profile additions, since a bulky upper storey that might otherwise pass the shadow test can still be refused on heritage visual bulk grounds, particularly where it would be visible from the street or affect a neighbouring heritage property’s outlook. The practical result for homeowners is that heritage overlay sites frequently need a more considered design response from the outset, balancing solar access protection with the neighbourhood character the overlay exists to protect.
Shadow diagrams remain just as mandatory on a heritage property as anywhere else, and the written overshadowing statement should acknowledge any heritage constraints shaping the design choices made to meet the standard. Homeowners renovating a heritage home often find the two sets of rules pull in the same direction in practice: keeping additions low and set back tends to help with both heritage sensitivity and sunlight retention at once.
Council-specific overshadowing guidelines and where to find them
While Clause 54 and Clause 55 set the statewide framework, individual councils publish their own practice notes and local planning policies that add detail on how overshadowing is assessed in their municipality. The City of Melbourne and the City of Yarra, both covering a high proportion of inner city apartment and terrace stock, publish planning scheme documents through VicPlan and their own council websites that homeowners should check before lodging.
Some councils request shadow diagrams at additional times beyond the standard 9am, 12pm and 3pm, such as 10am and 2pm, depending on local practice notes and the typical lot configurations in that municipality. It’s worth confirming this directly with your council’s planning department or local law documents before finalising your drawing set, since turning up to lodgement with the wrong diagram times is an easy way to trigger a request for further information.
Your council’s planning scheme, available through VicPlan, is the first place to check for any local policy that goes beyond the state standards, particularly in areas with neighbourhood character overlays or design and development overlays layered on top of the standard Clause 54 and 55 requirements.
Yorcon’s perspective: how we design to avoid overshadowing delays and protect solar access
We’ve spent nearly twenty years managing residential builds across Melbourne, and overshadowing is one of the few planning issues where getting the design right the first time genuinely saves months, not just paperwork. We brief shadow diagrams against the ResCode objectives from the earliest concept sketches, not as an afterthought once floor plans are locked in, because a roofline adjusted on paper costs nothing compared to a redesign after refusal.
When managing a project end to end, homeowners can expect coordination of the surveyor, the diagram author and the planner as one process, so the written overshadowing statement and the drawings tell the same consistent story to council.
— Matthew
How Yorcon can help: permit-ready designs and project management
Getting shadow diagrams, written statements and design drawings to align takes coordination, and this coordination is an important part of managing building projects. Rather than clients needing to brief a surveyor, a draftsperson and a planner separately and hope their work lines up, the whole sequence can be managed under one roof, which is where most of the redesign risk on overshadowing-sensitive projects actually comes from.
Our relevant services include:
Architectural House Designs, priced from $15,000 to $35,000, covering permit-ready drawings including the shadow diagrams and documentation council will assess.
Home Extensions, for projects where a new upper level or rear addition is most likely to raise overshadowing questions.
Design & Build, our full service that keeps design, permit documentation and construction under one coordinated process.
Heritage Home Renovations & Restorations, for properties where heritage overlay and overshadowing rules both need addressing in the same design.
If you’re not sure whether your block, your neighbour’s solar panels or a heritage overlay will complicate your overshadowing assessment, our free project feasibility call is the simplest way to find out before you commit to drawings.
FAQ
What are the main building laws in Australia?
Building work in Australia is governed by the National Construction Code alongside each state’s planning scheme, with Victoria applying ResCode standards under Clause 54 and Clause 55 for residential overshadowing, overlooking and setback controls. Local council planning schemes, accessible through VicPlan, add further requirements such as heritage and neighbourhood character overlays on top of the state framework.
What are the building regulations for overlooking in Victoria, Australia?
Overlooking in Victoria is assessed separately from overshadowing, generally through distance and screening tests designed to protect a neighbour’s privacy from upper level windows and balconies. Our guide to overlooking rules explains the specific distance and screening thresholds that commonly apply to Melbourne homes.
What is overshadowing in planning?
Overshadowing in planning refers to the shadow a new building or extension casts over a neighbouring property’s secluded private open space or habitable room windows. Victoria’s ResCode standard requires at least five hours of sunlight between 9am and 3pm on 22 September across most of that open space, unless existing conditions already provide less.
What are the copyright laws for house plans in Australia?
Architectural drawings and house plans are generally protected as artistic works under the Copyright Act, meaning the designer or architect who creates them usually holds copyright unless it’s assigned elsewhere in a contract. Homeowners engaging a design and build service should check their agreement for how plan ownership and reuse rights are handled before construction begins.
Do I need a shadow diagram for a small home extension?
Most planning permit applications in Victoria require shadow diagrams regardless of extension size, though some small, code-assessable projects that stay well within existing setbacks may fall under a simplified pathway. Checking with your council before finalising drawings is the safest way to confirm whether your specific project needs the full diagram set.
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