What are the costs associated with building a granny flat?
Written by Clayton Bielby
Updated at April 5th, 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
Expandify pricing as of 2025:
50sqm Crest Model: DIY from $99K | Complete from $135K
80sqm Peak Model: DIY from $149K | Complete from $185K
Base prices include:
Internal fit-out: kitchen, bathroom, laundry, fixtures, and flooring
Structural system: steel frame, roof, modwood patio, walls, and ceiling system
Certifications and engineering documentation
Additional charges may apply for:
Site slope correction or cut and fill
Site works or trenching beyond 10m
Rural delivery or crane access
DA-related overlays (e.g. BAL, flood, acoustic)
All pricing is finalised after the Prelim and full quoting session.