Key Takeaways
- Advanced scenarios need modified approaches for limited access and damaged properties.
- Portfolio tiered screening evaluates 20-30 properties monthly.
- Cognitive biases systematically skew estimates downward.
- Structured processes and historical data counter bias.
Advanced scenarios push beyond standard methods—limited access, portfolio estimating, cognitive biases, and budget crises.
Advanced Challenges
Occupied properties limit inspection. Damaged properties have unpredictable conditions. Multi-unit scaling requires templates. Code conversions involve different frameworks.
Portfolio Estimating
Two-tier system: parametric screening for all prospects, assemblies for those passing. Enables evaluating 20-30 properties monthly.
Cognitive Biases
Anchoring, optimism, scope neglect, and confirmation biases systematically underestimate costs. Structured processes and historical data are defenses.
Watch Out For
Ignoring cognitive biases when estimating renovation costs
Systematic underestimation due to anchoring, optimism, and scope neglect
Fix: Use structured processes, historical data, and independent verification to counter bias
Key Takeaways
- ✓Advanced scenarios need modified approaches for limited access and damaged properties.
- ✓Portfolio tiered screening evaluates 20-30 properties monthly.
- ✓Cognitive biases systematically skew estimates downward.
- ✓Structured processes and historical data counter bias.
Sources
- RSMeans/Gordian Residential Cost Data(2025-01-15)
- NAHB Construction Cost Survey(2025-01-15)
Common Mistakes to Avoid
Ignoring cognitive biases when estimating renovation costs
Consequence: Systematic underestimation due to anchoring, optimism, and scope neglect
Correction: Use structured processes, historical data, and independent verification to counter bias
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Test Your Knowledge
1.What cognitive bias causes investors to systematically underestimate renovation costs?
2.How many properties can a portfolio tiered screening system evaluate monthly?