In addition, this is how fumigation services normally price jobs, so you can make an estimate of the cost ahead of time.
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Measure the length, width and height of the house. Multiply the three measurements together to find the volume in cubic feet. For example, if the house is 60 feet long, 30 feet wide and has 8-foot ceilings, 60 x 30 x 8 = 14,400 cubic feet. If your house is a non-rectangular shape, such as an L-shape, break the house down into rectangular sections. Measure and calculate the sections separately.
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Find the cubic volume of any basement or crawlspace under the house the same way you figure cubic feet for the house itself (length x width x height). Use the same formula for any garages or other attached sections you will fumigate.
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Calculate attic spaces. Most attics are pitched (slanted). If this is the case, measure the length, width and maximum height of the attic. Multiply the figures together, and divide the result by 2 to find the volume in cubic feet of the attic.
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Add the volume in cubic feet of each section of the house, basement, attached structures and attic together to calculate the total cubic feet for fumigation.