Measure the total space with a measuring tape, using a helper if needed. Record measurements of wall lengths. Measure the breadth and depth of permanent items, such as sinks or protruding craft cabinets, and record the measurements. Also measure the breadth of permanent openings like windows, doors and closets. Next measure and record the dimensions of movable items, like desks and chairs. Remember to calculate the entire dimensions of a chair --- but also measure separately what protrudes normally from under a desk or table.
Using graph paper, draw an outline of the classroom by allowing one or two graph squares per foot of measurement. Be sure to write down the scale somewhere prominent, such as "two squares equals one foot." Next, rounding up, outline the basic shapes of the items in the room using the same scale. For ease of use, divide squares in no more than half. Label the diagram, using notes like "sd" for "student desk".
Visualize re-arranged classroom furniture by drawing an empty diagram of the total classroom on graph paper. Next, mark where permanent items and openings are along the walls and on the floor. Then cut out colored or labeled graph squares that represent scaled objects like furniture and other movable items. Arrange the graph squares on the empty graph diagram of the classroom to represent the classroom in its current state. Rearrange graph squares to show new alternative classroom arrangement.
Account for your unique classroom needs when choosing a new arrangement. Consider storage for student belongings, activity areas and other stations that support your teaching methods. Also consider the relationship between classroom arrangement and classroom management.