Compare Renovation Scenarios & Calculate Returns
Build ROI & Scenario Analysis
Before committing to a renovation or development project, compare different build scenarios side-by-side. Our ROI calculator factors in construction costs, purchase price, stamp duty, holding costs, and estimated selling costs to project returns for each approach.
Key Capabilities
What's Included
Scenario Comparison
Compare raise-and-build vs second storey addition vs basement conversion for the same property. Each scenario generates a full cost breakdown and end-value estimate, enabling direct comparison of investment returns.
Total Cost Accounting
Our ROI calculation goes beyond construction costs to include purchase price, stamp duty, legal fees, holding costs (mortgage, rates, insurance during build), and estimated selling costs (agent commission, marketing, legal) for a complete picture.
Builder Type Comparison
Compare costs across builder types: retail builder (1.0x multiplier), owner-builder (0.85x — 15% savings), and mates rate (0.70x — 30% savings). Understand the realistic savings and risks of each approach.
Budget Management
Generate a detailed 120+ line item budget across 16 construction phases. Track budgeted vs actual costs, manage vendor quotes, and monitor variance from budget as the project progresses.
Process
How It Works
Select Property & Scenario
Choose a property and select one or more build scenarios. Specify finish level and builder type preferences to customise the cost estimation.
Cost Generation
The system generates detailed cost estimates for each scenario using current market rates adjusted for inflation. Costs are broken down by phase and line item.
End Value Estimation
Comparable sales of recently completed similar renovations in the suburb are used to estimate the finished property value for each scenario.
ROI Calculation
Total investment (purchase + build + holding + transaction costs) is compared against estimated end value to calculate projected ROI, gross profit, and return per dollar invested.
Data Sources
All data is sourced from publicly available datasets and official APIs. No proprietary or private data is used.
- ABS Producer Price Index — Construction cost inflation
- Domain.com.au — Comparable sales of renovated properties
- Queensland Revenue Office — Stamp duty rates
- Industry rate databases — Construction cost rates
- Brisbane City Council — Approval fee schedules
Key Benefits
Transparent, data-driven analysis to support — not replace — professional property advice.
- Side-by-side scenario comparison for same property
- Full cost accounting including transaction and holding costs
- Builder type multipliers for realistic cost comparison
- 120+ line item budgets for project management
- End value estimation from comparable renovated sales
- Stamp duty, legal, and selling cost calculations included
Important Disclaimer
ROI projections are estimates based on current cost rates and comparable sales data. Actual returns depend on construction cost management, market conditions at time of sale, quality of build, and factors beyond prediction. These projections are planning tools — not guarantees of investment performance. Consult a qualified financial advisor and licensed builder before making investment decisions.
Explore Other Features
Discover the full range of prediction and analysis tools available.
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Brisbane City Plan 2014 Overlay & Compliance Checking
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Property Intelligence & Scoring
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