Insurance premiums for steel buildings are consistently lower than for wood or brick structures — a direct result of how insurers assess risk, not a coincidence of the market.
What Determines Your Premium
- Age — how old the building is
- Area — lot size, land quality, and local real estate market
- Business use — whether the building is used commercially, and whether chemicals or machines are involved
- Damage potential — likelihood of damaging natural conditions in the area
- Materials and structure — the strength and damage resistance of the building system
- Occupancy — how many people regularly live or work at the building
- Safety features — smoke alarms, sprinklers, emergency exits, and similar additions
- Size — how big the structure is
Why Building Classification Matters
Insurers sort structures into building classifications, and each one directly affects your rate. Wood and composite structures (“Frame” classification) are more prone to collapse or fire, putting them in the highest-premium category. Structures using concrete alongside wood (“Jointed Masonry”) sit in a somewhat better position, but steel’s fire resistance and structural consistency generally land it in a materially lower-risk classification than either.
The Bottom Line
Since materials and structure directly factor into an insurer’s risk assessment, and steel resists fire, pests, and structural damage far better than wood, a steel building earns a lower premium purely on the merits of what it’s made of — before you even factor in safety features or business use. That’s a genuinely different situation than most cost comparisons in construction, where a cheaper upfront material usually comes with some kind of hidden long-term cost. Here, the more durable material is also the one that costs less to insure — the incentives point the same direction rather than working against each other.
How Much Can You Actually Save?
The exact savings vary by insurer, region, and building use, so there’s no single universal number — but the classification difference between steel and wood construction is significant enough that it’s worth getting quotes on both if you’re comparing building materials for a new project. Even a modest percentage difference in your annual premium adds up meaningfully over a building’s decades-long service life, on top of the maintenance savings steel already offers over wood.
Questions Worth Asking Your Insurer
Not every insurer weighs building material the same way, so it’s worth asking directly rather than assuming a universal discount applies. Ask whether your insurer’s rates factor in building classification specifically, whether a certified engineering package (stamped drawings, documented design loads) affects your premium, and whether any additional safety features — sprinklers, monitored alarms, fire-rated doors — would lower your rate further. A direct comparison between quotes for a steel structure and a wood-framed equivalent of the same size and use is the most reliable way to see the actual dollar difference for your specific situation.
Certification Strengthens the Case Further
Insurance classification is separate from — but related to — a building’s engineered structural rating. A certified, engineer-approved building with stamped drawings on file gives your insurer clear documentation of what the structure was actually designed to withstand, which can support a stronger insurance case than an uncertified structure of the same material.
Permits, Codes & Engineering
Structural requirements follow the ASCE 7 standard from the American Society of Civil Engineers in the U.S., or the National Building Code of Canada. Toro’s in-house engineering team provides the stamped, certified drawings that can support your insurance case alongside your building’s structural classification.
Related Building Types
Certified vs. Non-Certified Metal Buildings | Steel vs. Wood | Fire-Resistant Steel Buildings
Build a Building That Costs Less to Insure
Toro Steel Buildings provides the certified engineering documentation that can strengthen your insurance case. Request a free quote to get started.