BASIX Certificates for Alterations and Additions NSW
Practical guidance on BASIX compliance, sustainability requirements and approval pathways for home extensions, renovations and residential alterations across New South Wales.
Supporting homeowners, architects, building designers and builders delivering home extensions, second-storey additions, major renovations and residential alterations throughout NSW.
Trusted by homeowners, architects, builders and developers across NSW.
Planning a Renovation or Extension?
Many residential alterations and additions in NSW require a BASIX Certificate as part of the planning and approval process.
Whether you're extending a home, adding a second storey or undertaking a significant renovation, early consideration of BASIX requirements can help avoid redesigns, reduce approval delays and support more efficient project delivery.
Why BASIX Matters for Alterations and Additions
BASIX helps ensure residential alterations and additions achieve improved sustainability outcomes while meeting approval requirements under NSW planning legislation.
Considering BASIX requirements during the design phase gives project teams greater flexibility to identify efficient compliance solutions before plans are finalised, helping reduce project risk and minimise unexpected changes later in the approval process.
Core Components of BASIX Assessments
Water Efficiency
Water-saving fixtures, rainwater harvesting and efficient design solutions help reduce potable water consumption.
Energy Efficiency
Building orientation, insulation, glazing and lighting contribute to improved energy performance.
Thermal Comfort
Thermal modelling helps create comfortable living spaces with reduced heating and cooling demand.
Why Project Teams Choose Senica
Successfully navigating BASIX requirements for alterations and additions requires more than certification. It requires practical compliance advice, early design input and a clear understanding of approval requirements.
Compliance Guidance
Clear advice on BASIX requirements, compliance obligations and approval pathways.
Residential Project Experience
Supporting renovations, extensions and alterations across a wide range of residential projects.
Integrated Project Support
BASIX, planning and sustainability expertise delivered through a single consultancy team.
Approval‑Focused Approach
Helping project teams reduce compliance risk and support smoother approval outcomes.
Our BASIX Process
Our process is designed to help project teams identify efficient compliance pathways early and navigate BASIX requirements with confidence.
1. Project Review
We review development plans and identify applicable BASIX requirements.
2. Compliance Assessment
Our team assesses compliance pathways and sustainability requirements.
3. Certification
BASIX certificates and supporting documentation are prepared and issued.
4. Project Support
We remain available to support project teams throughout the approval process.
Related Services
Complement your BASIX assessment with integrated sustainability, planning and compliance services that support more efficient project delivery and approval outcomes.
Frequently engaged together on townhouse and multi‑residential developments.
Thermal performance modelling and NatHERS assessments for residential developments.
Development application support and planning advice for residential and commercial projects.
Sustainability consulting and ESD reporting for residential and commercial developments.
GET IN TOUCH
Contact Us
Ready to Get Started?
Every project is different. We take the time to understand your design, compliance requirements and approval pathway before recommending the most appropriate assessment approach.
Send your plans or project information to info@senica.com.au or call 02 8006 7784 and our team will provide project-specific advice, a tailored fee proposal and clear guidance on the next steps required for your project.