Construction & Building Newsletter
Author: Luis Plazola - Senior Construction Cost Estimator, Cotality
May 2025
As natural disasters increasingly threaten residential structures, resilience-focused construction has become a crucial consideration in homebuilding.
This study presents a cost-benefit analysis of the FORTIFIED Home Designation, an advanced building standard developed by the Insurance Institute for Business & Home Safety (IBHS) to enhance structural durability against high winds, hail, and tornadoes. The research quantifies the financial impact of fortified certification by analyzing construction cost differentials.
Initial industry findings select markets (primarily Oklahoma, where almost all fortified homes have been built) indicate that FORTIFIED certification generally increases construction costs by 1% to 2.6% of a home’s sales price, with insurance premium discounts ranging from 3% to 42%. Independent research shows that these costs increases can vary from 1% to over 6% of a home’s sales price, which is more in line with what FORTIFIED professionals encounter in practice. This cost discrepancy is attributed almost entirely to added engineering costs required that are not explicitly factored as construction costs.
Production homebuilders can leverage economies of scale to reduce costs, making FORTIFIED homes a strategic investment in disaster-prone regions and potentially reduce insurance liabilities in the long-term.
The increasing frequency and severity of extreme weather events have necessitated a reassessment of cost-effective mitigation strategies in residential construction, particularly in high-risk areas such as Oklahoma. Given the financial and structural risks posed by tornadoes, hailstorms, and high winds, understanding the cost differentials associated with resilience-based construction is essential. The FORTIFIED Home Designation, developed by the Insurance Institute for Business & Home Safety (IBHS), offers a tiered certification system aimed at enhancing structural durability. This study examines the cost implications of achieving various levels of FORTIFIED certification and compares them with conventional construction costs to determine the long-term financial viability of such investments.
The increasing frequency and severity of extreme weather events have necessitated a reassessment of cost-effective mitigation strategies in residential construction, particularly in high-risk areas such as Oklahoma.
Given the financial and structural risks posed by tornadoes, hailstorms, and high winds, understanding the cost differentials associated with resilience-based construction is essential. The FORTIFIED Home Designation, developed by the Insurance Institute for Business & Home Safety (IBHS), offers a tiered certification system aimed at enhancing structural durability. This study examines the cost implications of achieving various levels of FORTIFIED certification and compares them with conventional construction costs to determine the long-term financial viability of such investments.
The primary concern for homeowners and builders considering FORTIFIED certification is the cost premium associated with upgrading beyond standard building codes.
Construction Methods & Considerations
A non-fortified home is typically constructed to minimum state-mandated codes, which do not always incorporate advanced mitigation features. In contrast, homes certified under the fortified program integrate additional structural reinforcements designed to withstand severe weather conditions. These enhancements come at an added cost, which varies based on the level of certification pursued.
At the FORTIFIED Roof level, improvements such as sealed roof decks, enhanced attachment techniques, and impact-resistant materials result in an estimated cost increase of approximately 1% relative to a standard non-FORTIFIED home. While this cost may seem marginal, it provides significant benefits in terms of reducing roof damage and water intrusion during storms. The FORTIFIED Silver level introduces further reinforcements, including braced gable ends, improved attic ventilation, and upgraded window protection, leading to an estimated cost increase of roughly 3% (+/- 1.4%). Finally, the FORTIFIED Gold certification requires a fully integrated continuous load path from the roof to the foundation, ensuring maximum structural integrity but at an increased cost of approximately 5-6%, including the associated engineering costs.
Industry reports regarding FORTIFIED cost differentials have ranged from 1-3%. Meanwhile, construction professionals, as well as the Program Director for FORTIFIED, Fred Malik, have indicated that cost increases are more in the 3-7% range. Independent findings calculated as part of this research show that the price increase on the low end is close to most sources (0.82% [Bronze/Roof]), while Silver and Gold, which are 4.38% and 6.38%, respectively, are firmly in line with what is seen in practice. The two most impactful factors swaying pricing are windows (Silver & Gold), and the continuous load path upgrades and engineering (Gold). These calculations assume a $450,000 home sale price on a 2,000 SF single-level property.
Cost Considerations
These upfront cost increases must be weighed against potential financial savings over the life cycle of the home. One of the most immediate economic benefits of FORTIFIED certification is the reduction in homeowner insurance premiums. Insurance providers typically offer policy discounts for homes meeting resilience standards, with reductions ranging from 3% to 42%. The extent of these savings is directly linked to the certification level, with FORTIFIED Roof homes generally receiving more modest reductions compared to fortified Gold homes, which incorporate the most comprehensive structural reinforcements. These premium savings, when accumulated over time, can contribute significantly to offsetting the initial construction cost increase.
Additionally, homes built to FORTIFIED standards tend to incur lower repair and maintenance costs over their lifespan. Non-FORTIFIED homes are more vulnerable to wind uplift, structural failure, and water infiltration, often requiring costly post-disaster repairs. In contrast, the enhanced structural integrity of FORTIFIED homes results in reduced susceptibility to damage, lowering long-term maintenance expenditures. This effect is particularly pronounced in high-risk areas where severe weather is recurrent, making resilience-based construction a potentially cost-effective choice.
Further financial considerations include potential increases in property value. Research suggests that homes incorporating disaster-resistant construction features are often more attractive to prospective buyers. In certain markets, FORTIFIED-certified homes have demonstrated appreciation rates of up to 7% compared to standard homes. This value increase is attributable to both the tangible structural advantages of FORTIFIED certification and the perceived benefits associated with lower insurance costs and reduced risk exposure.
Despite these potential financial advantages, several challenges hinder the widespread adoption of FORTIFIED certification. Chief among these is the initial capital outlay required to achieve certification, which may be prohibitive for some homeowners, particularly those in lower-income demographics. Furthermore, financing mechanisms for resilience-based upgrades remain limited, with relatively few programs offering incentives for homeowners seeking to invest in structural mitigation. Additionally, many builders and developers remain unaware of the specific cost implications and benefits associated with FORTIFIED construction, which may contribute to reluctance in adopting these standards.
A detailed comparison of cost differentials across FORTIFIED certification levels provides valuable insights into the trade-offs between initial investment and long-term financial savings. While FORTIFIED Roof certification represents the most accessible and cost-effective entry point, it offers fewer insurance savings and resilience benefits than Silver or Gold certification. The Silver level provides a balanced approach with moderate cost increases and enhanced financial returns in the form of insurance reductions and lower repair costs. Meanwhile, FORTIFIED Gold certification, while requiring the highest initial expenditure, ensures the most robust structural protection and the greatest potential long-term financial benefits.
Understanding the financial implications of resilience-based construction is crucial for stakeholders, including homeowners, builders, insurers, and policymakers. While higher certification levels yield greater cost savings and durability benefits over time, the decision to pursue FORTIFIED certification ultimately depends on individual financial constraints and risk tolerance. This analysis highlights the complexity of evaluating cost differentials in resilience construction but underscores the importance of considering both immediate expenditures and long-term financial stability when assessing homebuilding strategies in disaster-prone regions.
Conclusion
FORTIFIED upgrade costs for the Bronze category (roof only) are firmly observed at 1% of sale price. Silver and Gold upgrade costs are roughly calculated at 4% and 6% of sale price, respectively, with a heavy influence from window upgrade costs (Gold & Silver) and continuous load path and engineering costs (Gold Only).
Total FORTIFIED designations:
Gold designations:
Silver designations:
Hurricane designations:
Fortified roof designations:
High wind designations:
North Carolina Insurance Underwriting Association (NCIUA) designations
Strengthen Alabama Homes (SAH) designations
Legacy designations*:
*What are legacy designations >
Table 1
Summary of calculated data for fortified home cost differentials – (Includes engineering)
Table 2
Summary of HUD data for fortified home costs in Oklahoma – (Excludes engineering)
Upcoming updates to Cotality Claims Estimate™
To further increase our options in the Claims Estimate program, we are in the process of expanding the options available for Clay Tile Roofing during the first half of 2025. This would include at least 6 different styles (small flat, large flat, scalloped, mission, Spanish, and oriental) in mortared and non-mortared options, 3 color tiers, 3 installation options (standard nailing and two field wiring options) and lightweight vs. standard weight tiles. This would bring the total combinations to at least 216 configurations – up from the current 6 (Spanish vs Mission; and only 3 color tiers).
We have also just recently expanded our offerings for metal roofing to include R-Panels and G-Panels, among other ribbed panel types, gauges, and finish options, to bring our total metal ribbed roofing options from just 12 to 52 during this first half of 2025.
