BASIX forms part of the New South Wales residential planning and approval system.
The assessment applies to many residential developments across NSW, including:
- new homes
- alterations and additions
- duplex developments
- multi-dwelling residential projects
BASIX evaluates areas including:
- water efficiency
- energy efficiency
- thermal comfort
WHAT IS A BASIX CERTIFICATE?
A BASIX Certificate confirms that a proposed residential project meets the required NSW sustainability benchmarks.
Depending on the project type, BASIX documentation may form part of a:
- Development Application (DA)
- Complying Development Certificate (CDC)
The assessment process often works alongside NatHERS thermal modelling and residential building performance analysis.
BASIX REQUIREMENTS IN NSW
BASIX requirements can vary depending on:
- project type
- climate zone
- approval pathway
- glazing performance
- thermal comfort requirements
Assessments commonly apply to:
- new dwellings
- renovations and additions
- secondary dwellings
- duplexes
- townhouse developments
- residential flat buildings
Early coordination between design, planning and building performance assessments can help reduce redesigns later in the approval process.
WATER, ENERGY AND THERMAL PERFORMANCE
BASIX assessments focus on three primary performance areas.
Water Efficiency
Water efficiency targets aim to reduce potable water consumption through elements such as:
- rainwater harvesting
- efficient fixtures
- plumbing strategies
- water-efficient appliances
Energy Efficiency
Energy performance considers factors including:
- glazing performance
- insulation
- lighting
- hot water systems
- appliance efficiency
Thermal Comfort
Thermal comfort assessments evaluate how the home performs across different climate conditions and seasons.
This may include consideration of:
- orientation
- shading
- glazing design
- ventilation
- insulation
- passive solar design
Explore the relationship between BASIX and NatHERS.
THERMAL COMFORT AND BUILDING PERFORMANCE
Thermal comfort forms a major part of residential building performance in NSW.
Good early-stage design decisions can significantly influence:
- heating and cooling demand
- long-term comfort
- glazing performance
- natural light
- overall energy efficiency
Factors such as orientation, shading and ventilation often play an important role in achieving stronger BASIX outcomes.
BASIX TARGETS AND BENCHMARKS
BASIX benchmarks are based on NSW residential sustainability targets.
The framework aims to improve:
- residential water efficiency
- greenhouse gas reduction
- thermal comfort performance
Performance requirements may vary depending on:
- building type
- postcode
- climate zone
- project scope
PREPARING FOR A BASIX ASSESSMENT
Preparing documentation early can help streamline the approval process and reduce delays during planning or construction stages.
This may involve reviewing:
- architectural plans
- glazing schedules
- insulation selections
- orientation
- shading strategies
- thermal performance pathways
For some projects, adjustments may be required during the design process to improve compliance outcomes.
BASIX AND RESIDENTIAL DESIGN
BASIX is not only about compliance documentation.
The assessment process can also support better long-term residential performance outcomes through:
- improved thermal comfort
- reduced energy demand
- lower water consumption
- more efficient building design
Early collaboration between designers, consultants and building performance assessors can often improve both approval efficiency and long-term occupant comfort.
NEED HELP WITH A BASIX CERTIFICATE?
Certified Energy provides BASIX assessments, NatHERS ratings and residential building performance advice for projects across New South Wales.
Services may support:
- new homes
- renovations and additions
- duplexes
- multi-dwelling developments
- residential performance assessments
Explore BASIX assessments and residential building performance guidance across NSW.
