The eave height is the outside wall height, where the walls meet the roof. It is very important that one doesn’t get the width and length confused, ...
www.americansteelbuildings.com/process.htm

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Note added at 50 mins (2006-08-22 20:14:07 GMT)
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eaves pl.n. The projecting overhang at the lower edge of a roof. ... takfot, takskägg.
www.answers.com/topic/eaves


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Note added at 2 hrs (2006-08-22 21:51:24 GMT)
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'Floor-to-ceiling height' or 'headroom height' are options, especially if the interior height is meant.


... headroom height 7.5 ft or greater.
www.legis.state.wi.us/rsb/code/comm/comm063.pdf

The present hospital building was custom designed by architect James Miller ... occupies a 50 x 50 m floor plate with a floor to ceiling height of 3.5 m. ...
www.glasgowarchitecture.co.uk/glasgow_royal_infirmary.htm



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Note added at 1 day1 hr (2006-08-23 20:44:43 GMT)
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'clear height'


Clear Height
Distance from the finished floor to the bottom of the rafter at the rafter-to-column connection.


Building Height
Building height is the eave height which usually is the distance from the bottom of the main frame column base plate to the top outer point of the eave strut. Eave height is the distance from the finished floor to the top outer point of the eave strut.

www.steelway.com/sbs/building_system_elements.asp