Network Rail was midway through the work to install new lift shafts down into the station's subway to provide step-free access to both platforms for the first time.
However, workers have found unexpected foundations believed to be from the first railway station built on the site in 1852, which lasted just 42 years before being destroyed by fire in 1894.
Unbeknown to the engineers, as it wasn't recorded in the plans of what was then rebuilt 129 years ago, the current building is constructed on top of the original station's 1852 foundations.
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The unexpected walls lie right where the lifts were due to go, and the substructure can’t be disturbed as it is integral to the existing building and platform.
It means new detailed designs now have to be drawn up for the lift shafts, pausing the building work for the time being.
Due to construction inside the subway is well underway, it will have to stay closed with the diversionary walking route staying in place for passengers.
People are being urged to use this route correctly, with incidents of people trespassing across the tracks to get between platforms still causing safety concerns.
Elinor Weymouth, scheme project manager for Network Rail, said: "We know how much the accessibility upgrades mean to people in Warwick and we’re sorry this unexpected setback means the building work has to be paused.
"We are committed to delivering this vital work so the station is accessible for everyone, and are working hard to get new plans drawn up and workers back on site as soon as we possibly can.
"I want to thank passengers for their patience while this work goes on behind the scenes and urge everyone to continue to follow the walking diversion that’s in place while the subway is closed."
