Residential Rebuild Cost Modelling and Rate Benchmarking for Insurance

This project involved the review and update of a large-scale residential rebuild cost model used to support insurance valuation across New Zealand. The system underpinned the estimation of reinstatement costs and required a high level of accuracy to ensure alignment between insured values and real-world construction costs.

The model contained hundreds of line items across all major construction trades, creating complexity in both validation and consistency. A key challenge was ensuring rates accurately reflected a wide range of residential typologies, including variations in size, configuration, and specification. Maintaining alignment across these variables required a structured and highly detailed approach.

A comprehensive benchmarking process was undertaken across all cost categories, incorporating current contractor pricing, supplier inputs, and industry data. Each element was reviewed and calibrated to reflect prevailing market conditions, ensuring consistency across the model while improving overall reliability.

The result was a more robust and accurate rebuild cost framework that enhances confidence in insurance assessments. By improving the accuracy of reinstatement values, the model supports better risk management and reduces the likelihood of under or over insurance, delivering stronger outcomes for both insurers and property owners.