Dozens of children and babies under the age of four were evacuated to safety when the blaze broke out at 12 noon.
It was caused by a fence next to the nursery catching alight and, due to tinderbox conditions cause by the heatwave, the flames spread within minutes.
As the nursery youngsters were evacuated to the nearby Blackberry clinic, more than 60 firefighters tackled the blaze.
A major incident was declared and at one stage there were 15 fire engines from across Buckinghamshire, Oxfordshire, Northamptonshire and Bedfordshire, each with a crew of four, plus fire officers.
By the time the fire was contained, it had ripped through the Kiddi Caru building and three nearby houses. All were 100% destroyed and will need rebuilding.
More properties have suffered smoke damage and “multiple” vehicles were also damaged, said a Bucks Fire and Rescue spokesman
Photographer Jane Russell visited the Fyfield Barrow site today to capture the devastation.
1. Fire damage at Kiddi Caru nursery in Walnut Tree
Much of the nursery's roof was destroyed Photo: Jane Russell
2. Fire damage at Kiddi Caru nursery in Walnut Tree
Piles of burnt out toys and nursery equipment can be seen Photo: Jane Russell
3. Fire damage at Kiddi Caru nursery in Walnut Tree
The windows shattered in the heat Photo: Jane Russell
4. Fire damage at Kiddi Caru nursery in Walnut Tree
At one stage there were 15 fire crews at the scene Photo: Jane Russell