Loss of solar access
Across multiple planning reforms, including new townhouse, mid-rise, and activity centre controls, there is a shift towards simplified, “deemed-to-comply” standards that prioritise speed and certainty of approval.
In this process, some long-standing protections around sunlight access — for both existing homes and new developments — are being reduced, weakened, or removed from assessment requirements.
This raises concerns about how well future developments will protect solar access in established suburbs.
Reduced consideration of overshadowing impacts
Under the new planning frameworks, if developments meet preset setback and height standards, they are generally required to be approved.
This limits the ability of councils to fully assess:
- Overshadowing of neighbouring properties
- Loss of direct sunlight to private open space
- Impacts on windows, living areas, and outdoor amenity
- Seasonal solar access changes across adjoining sites
As a result, compliance with numeric rules may override broader solar amenity outcomes.
Impact on existing homes
One of the key concerns is the effect of taller or bulkier developments on surrounding established dwellings.
Reduced setbacks and increased building envelopes can lead to:
- Significant loss of afternoon or winter sunlight
- Shading of backyards and private open space
- Reduced natural light into living areas
- Increased reliance on artificial lighting and heating
These impacts are often cumulative, particularly where multiple redevelopments occur along the same street.
Less emphasis on solar energy systems
Solar access is also important for the effectiveness of rooftop solar systems.
However, under streamlined assessment frameworks:
- Impacts on neighbouring solar panels may not be fully assessed
- Overshadowing from new developments may not be a determining factor
- Existing systems may lose efficiency due to increased shading
This can undermine household investment in renewable energy and broader climate goals.
A shift from performance to compliance
Traditional planning approaches often considered solar access as a performance outcome — balancing height, setbacks, orientation, and neighbourhood context.
The new system increasingly relies on compliance with fixed measurements, such as:
- Setback distances
- Maximum building heights
- Standardised envelope controls
While simpler to assess, this approach can fail to capture real-world sunlight impacts on surrounding properties.
Cumulative street-level effects
The impact of individual developments may appear minor in isolation, but across a street or neighbourhood, the effect can be significant.
Over time this may result in:
- Progressive loss of sunlight along residential boundaries
- Darker, more enclosed street environments
- Reduced comfort and usability of outdoor spaces
- Lower overall residential amenity
These changes are often irreversible once development occurs.
Why this matters
Access to sunlight is a fundamental aspect of liveability.
It affects:
- Physical and mental wellbeing
- Energy efficiency in homes
- Usability of private outdoor spaces
- The character and feel of neighbourhoods
It is also a key element of sustainable urban design, particularly in a warming climate where natural light and passive heating play an important role.
What this means for Melbourne
As planning controls become more standardised and permissive, there is a growing risk that solar access is treated as a secondary consideration rather than a core planning outcome.
Without stronger safeguards, Melbourne’s suburbs may experience:
- Reduced daylight in established homes
- Increased overshadowing from new developments
- Lower quality private and public outdoor spaces
Balancing housing growth with solar access protection is essential to maintaining liveable, healthy, and sustainable neighbourhoods.