The 52-year-old, from Chipping-Norton in Oxfordshire, surpassed his previous official record by 8mph on Saturday August 19, at the Wheelie and Top Speed Championships event at Elvington Airfield in York.
Kevin was hoping to break the 100mph mark and only fell short due to high winds and adverse weather conditions.
But thanks to the added nitrous boost he recently installed on the back of the unorthodox vehicle, Kevin was still able to power through and officially break his existing record.
He said: “The drive out there was absolutely perfect and I really, really pushed it with the nitrous – everything went to plan.
“I’ve added the nitrous oxide - laughing gas - because at certain times you squirt it in and it’s an oxygenator.
It took Kevin seven months and £5,000 to convert his Volkswagen Passat into the drivable shed.
The vehicle weighs two tonnes with its steel framing and has a 2.8 litre V6 petrol engine.
Kevin said: “The whole thing is completely steel-framed so it’s incredibly strong, but incredibly heavy too.
“It has a 200-brake horsepower – but with the nitrous that adds an extra 75.
In the week leading up to Kevin’s record attempt, he drove the shed on the M5 – from Land’s End all the way to John O’Groats in an attempt to raise money for the hospice which cared for his mother before she died of cancer earlier this year.
He said: “I’m very proud – I’ve just driven 700 miles from Land’s End to here."
“You know, I own the world’s fastest shed and it’s an idea I came up with, I built and I got it fully approved and road legal.
“I got into the racing events, the top speed events and I travel all over the country racing it.