For anyone building a new home, there are plenty of things that can keep you awake at night - budgets, approvals, timelines and design decisions, to name just a few. But there’s one issue many new home builders have never heard of until it becomes a problem: overshadowing.
As part of our Building, Decoded series, we're unpacking some of the more technical aspects of homebuilding and explaining why they matter. This time, we're shining a light on overshadowing - a critical planning requirement that can have a major impact on the home you're able to build.
What is overshadowing?
Overshadowing occurs when a building or structure blocks sunlight from reaching a neighbouring property beyond permitted limits. In Victoria, overshadowing is governed building regulations and compliance must be considered when designing a new home.
Why does it matter?
While it may not seem particularly relevant while you're focused on your own future home, overshadowing plays an important role in protecting the liveability of surrounding homes. Access to natural sunlight affects comfort, energy efficiency and the overall enjoyment of indoor and outdoor spaces. Without adequate sunlight, homes can become darker, colder and more reliant on artificial lighting and heating. Just as these requirements help protect your neighbours today, they also help ensure your own access to valuable natural light is protected into the future.
Meeting overshadowing requirements is also a key part of obtaining planning approval for your new home. If a proposed design doesn't comply, it cannot be built. Sometimes we can modify a design for approval to be granted, and in other circumstances, an application can be made for an exemption to the standards, but success is never guaranteed.
For homeowners, that can mean unexpected redesigns, additional costs and significant delays if overshadowing isn't assessed in the earliest stages of planning your new home.
That's why understanding and addressing overshadowing from the very beginning is so important. A floorplan that looks perfect on paper may not always be suitable for a particular block if it doesn't meet planning requirements.
What do the regulations say?
Overshadowing regulations are designed to strike a balance between accommodating new development and protecting neighbouring properties.
In Victoria, a neighbouring private open space must generally continue to receive adequate sunlight. As a rule, at least 75% or 40 square metres (whichever is less) of a neighbour's private open space should receive a minimum of five hours of sunlight between 9am and 3pm on 22 September, the spring equinox. If the area already receives less sunlight than this, a new development should not reduce it further.
The regulations also help protect sunlight access through habitable room windows, such as those serving living rooms, dining rooms and bedrooms. Particular attention is given to windows that are already limited in their access to natural light, as excessive overshadowing can significantly affect the amenity of a home.
The hidden challenge many buyers don't see coming
Not all builders assess overshadowing at the same stage of the journey.
In many cases, compliance checks occur later in the planning process. When that happens, buyers can sometimes discover that their preferred floorplan requires substantial changes to meet planning requirements. In the worst-case scenario, they may need to select an entirely different design.
“We spoke with several builders before choosing Henley. Most told us they'd work through overshadowing later in the process, but Henley took the time to investigate everything upfront. Our consultant reviewed potential overshadowing and site constraints before we paid a deposit, giving us confidence that the home we wanted was actually achievable”, says Henley client David, whose knockdown rebuild home is currently under construction in Melbourne's north.
For most people building a new home, the floorplan is one of the biggest factors influencing their builder choice. Finding out late in the process that a design won't work can be devastating, frustrating and costly.
“The honesty and diligence we received early in the sales process gave us confidence that there would be no surprises later and ultimately made our decision to build with Henley an easy one,” adds David.
Why we check early
At Henley, we believe certainty matters. That's why we consider overshadowing early in the homebuilding journey - before we take any deposits.
Your new home consultant will use a siting tool to conduct an initial assessment of overshadowing and other siting considerations. From this, we will know whether your proposed build is all clear, unable to proceed, or needs further assessment.
If the job needs further assessment, your new home consultant will explain the next steps to determine how overshadowing compliance can be achieved.
In a vast majority of scenarios, our assessment of overshadowing is finalised during the sales stage, before your project transitions to our head office. After this point the only reason we would need to reconsider overshadowing, is if you make any changes to your plans, or if conditions change on site.
By assessing potential planning constraints upfront at the sales stages, we're able to provide greater confidence that the home design you've chosen is the one you'll actually be able to build.
It's a proactive approach that helps reduce surprises later in the process and gives our customers greater confidence as they move towards building their new home.
Because when it comes to planning approval, what you don't know can hurt your project. And that's exactly why overshadowing is one of the first things we check.
Building, Decoded is Henley's series dedicated to explaining the terminology, regulations and processes behind building a new home, helping you make informed decisions with confidence.
