How to calculate building area?

How to Calculate Building Area. 1 Step 1. Measure the length and width of each room by measuring adjacent walls. 2 Step 2. Multiply the length to the width for the area of each individual room. Record the area figures on sheet of paper as you go. 3 Step 3. Add the area figures for each room in order to obtain the total area or square footage for the entire building. references.
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