Cardinal Change
A change to a contract so fundamental that it goes beyond what the parties originally bargained for, effectively creating a different project altogether, giving the contractor grounds to treat the original contract as breached rather than simply pricing yet another change order.
Why it matters
A cardinal change usually isn't one dramatic event, it's the cumulative effect of many individually reasonable change orders that, added together, turn the project into something the contractor never actually priced or agreed to build.
On a real project
A renovation contract for cosmetic upgrades to an office building accumulates so many structural, mechanical, and electrical change orders that the finished project bears little resemblance to the original scope, a pattern that can support treating the cumulative change as cardinal.
Who this matters most to
A Construction Claims Consultant analyzes a project's full change order history to determine whether its cumulative effect crossed the line from ordinary changes into a cardinal change.
Where this goes wrong
An owner issues change order after change order, and the contractor keeps pricing and processing each one individually as routine, never stepping back to recognize the cumulative effect has become a fundamentally different project. By the time anyone raises a cardinal change argument, the contractor has already absorbed costs a breach claim could have recovered.