To make way for the building's new front section, the school's administrative offices, some instructional rooms, the health room and a special education resource room were demolished, said Ingram, who has moved his office into a trailer behind the school.
Students who used the demolished instructional rooms share the auditorium's stage, which is divided by partitions.
The school's counselor is working out of a small room previously used to store folding chairs.
The inconveniences will continue through the next school year, when the school's 560 students will take turns in the new section while their classrooms are renovated, Ingram said.
The future instructional benefits, which will include an expanded library, a library classroom, a new computer lab, an additional first-grade classroom and two new preschool classrooms, will be well worth the present inconvenience, he said.
"We keep focusing on the end product," Ingram said. "This is what we have to go through to get what we need to do the job for the boys and girls at Lincolnshire."
When the project is finished, the school will no longer need its three portable classrooms, he said.
And student safety will be improved by separating bus and car traffic, he said.
The old part of the building - built in the mid-1950s with an addition in mid-1960s - will be redecorated and have new wiring, plumbing, lighting and windows, Ingram said.
For the first time, the school will have air-conditioning and a sprinkler system, he said.
It's about time the school got a face lift, said former Lincolnshire student Cathy Near, who has two children at the school.
"I started kindergarten here, and there hasn't been much change except the outdoor rooms," said Near, 41, of Halfway.
First-grader Zachary Harbaugh said this year has been a lot noisier than last year because of the new construction. But it's worth it, he said.
"The school kind of did need change because I thought it was kind of small," said Harbaugh, 6. "And I like the big machines out there."