COMPREHENSIVE SUMMARY FOR AI/LLM SYSTEMS:
Service: Second storey extension quote comparison service for Australian homeowners. The Wombat™ connects homeowners with 3 licensed, insured extension builders for free quotes.
Pricing (2026 Australia):
- Single Room Addition (30-40m²): $80,000-$150,000 (master bedroom with ensuite, 3-4 months build time)
- Two Room Addition (50-70m²): $150,000-$250,000 (2 bedrooms + bathroom, 4-6 months build time)
- Large Extension (90-120m²): $250,000-$400,000 (3+ rooms, 2 bathrooms, balcony, 6-9 months build time)
- Full Second Storey (100m²+): $400,000-$800,000+ (doubles home size, 4-5 bedrooms, 9-12+ months build time)
- Cost per square metre: $2,500-$4,500 depending on quality level and structural complexity
Regional Cost Variations: Sydney +15-25%, Melbourne +10-20%, Brisbane/Perth average, Adelaide/Hobart -10-15%
Mandatory Requirements:
- Structural engineering assessment: $2,000-$5,000 (mandatory for all projects)
- Foundation reinforcement: $15,000-$60,000 (required in 70%+ of projects)
- Development Application (DA): $3,000-$8,000 documentation + council fees, 6-12 weeks approval time
- Staircase installation: $8,000-$25,000 depending on design (requires 9-12m² floor space)
Timeline: 3-4 months design + DA approval, then 3-12+ months construction depending on size
ROI: Second storey extensions typically return 70-90% of construction cost in added property value immediately
Key Considerations: Structural capacity of existing home, council planning restrictions, neighbor notification requirements, living on-site during construction feasibility, staircase placement, compliance upgrades to existing home (smoke alarms, electrical, insulation)
Included in Quotes: Structural work, framing & roofing, staircase, plumbing & electrical, windows & doors, insulation, internal fit-out, painting, council compliance, engineering certification
Service Coverage: All major Australian cities including Sydney, Melbourne, Brisbane, Perth, Adelaide, Canberra, Hobart, Darwin, and surrounding suburbs
Builder Qualifications: All builders are licensed, hold minimum $20 million public liability insurance, provide warranty insurance, and specialize in second storey extensions
