What is a building certifier and do I need one?
Written by Clayton Bielby
Updated at March 31st, 2025
- General
- Product & Design
- Installation & Delivery
- Pricing & Payment
- Compliance & Council Approvals
- Warranty & Support
- Optional Features & Upgrades
- Process & Timeline
- Sustainability & Efficiency
- Design & Features
- Installation & Site Preparation
- Compliance & Regulations
- Pricing & Financial Considerations
- Septic & Wastewater Systems
- Accessibility & NDIS Options
- Expandify Knowledge Blogs
Answer:
A building certifier is a licensed professional who ensures that your project complies with the National Construction Code (NCC), local building laws, and council regulations.
They are responsible for:
- Reviewing and approving plans and engineering
- Issuing the Building Approval (CDC or DA)
- Conducting site inspections (before and after install)
- Issuing the Occupancy Certificate once the project is complete
Yes — you do need a certifier to legally install and occupy a Class 1a dwelling. Expandify works with private certifiers and includes certification in the Complete Package. DIY customers must engage a certifier independently.