Work has started on a six-month project to build a £450,000 science block at a 380-year-old school.
Contractors have unearthed four huge conifer roots from the grounds of Caistor Grammar School.
It is the first phase of the scheme, which is due for completion in August.
Opened in 1631, Caistor Grammar consistently achi- eves the highest GCSE and A-level results of any state secondary in the county.
Now it is gearing up to improve on the reputation which raised the bar even higher with inclusion in the prestigious Good Schools Guide.
Head teacher Roger Hale, who has been at the helm since 1996, is confident that the science block will be money well spent.
"We don't have a lot of room on our site here so we have to make the best use of it," Mr Hale said.
"The new block will be the legacy of our memorable summer of 2012 and will be called the Olympic Torch Building. It will be a permanent reminder of the fact that five of our students actually carried the Olympic torch, a feat which I believe was only achieved by our school.
"And, of course, we had the former head boy Jordan Duckett having the honour of being a cauldron lighter at the opening ceremony of the Games."
The school's site manager, Rick Broddle, said the removal of the tree roots paved the way for the scheme to go ahead as planned.
"We're very short of space and at the moment some science classes have to be split in two because the labs we use aren't big enough," he said.
"But the new building will provide two new large laboratories and smaller teaching rooms on two floors."
Topcon site manager Stefan Senyszyn confirmed that the 650-student school would have its new scientific initiative in place by September.