The phrase "a significant redesign" is correct and usable in written English.
You can use it when discussing changes or improvements made to a design, product, or system that are substantial in nature.
Example: "The company announced a significant redesign of its website to enhance user experience and accessibility."
Alternatives: "a major overhaul" or "a substantial redesign."
A significant redesign of 2000-model Legands and Legacy-derived Outbacks brought many improvements.
New York regained stature and salience after a significant redesign of the magazine and Web site over the past few years.
Dispensing with it would require "a significant redesign of our farming systems", according to the sustainable food trust, which supports such a move.
President Obama ordered a significant redesign of the European missile-defense architecture he inherited from George W. Bush, who favored placing interceptor missiles in Poland and a radar system in the Czech Republic.
Even as preservationists argue for rehabilitation of what they consider the finest surviving example of Mr. Friedberg's work, the City of Minneapolis, which owns 75 percent of it, has commissioned a significant redesign of the space.
The government is doing emergency fortification work on the Parkville cells, where detainees were able to escape by climbing through the roof, but they are also planning a significant redesign and reconstruction which could put units out of commission for months.
Sneak peeks show a fairly significant redesign.
At NetApp, we went through a very significant redesign of our IT organization, to help with both cost efficiencies and agility.
Promoting liberal and democratic institutions in the Middle East should be decoupled from this fight, since it is a much more long-term project — and a project in need of significant redesign.
Amid all this, there appear to be some positive signals for Snap regarding growth despite the significant redesign and a lot of backlash over it.
Last week, Bing began the initial phase of rolling out a major redesign, in fact the "most significant" redesign in its three-year history.
